® 287/289 True-rms Digital Multimeters Users Manual June 2007, Rev. 1, 7/08 © 2007, 2008 Fluke Corporation. All rights reserved. Specifications subject to change without notice. All product names are trademarks of their respective companies.
Lifetime Limited Warranty Each Fluke 20, 70, 80, 170, 180 and 280 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein, “lifetime” is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase.
Table of Contents Title Lifetime Limited Warranty............................................................................................... Introduction .................................................................................................................... Contacting Fluke ............................................................................................................ Safety Information ...........................................................................................
287/289 Users Manual Controlling Meter Power ................................................................................................ Powering the Meter On and Off Manually ................................................................. Battery Level Indicator .............................................................................................. Automatic Power-Off ................................................................................................. Battery Saver Mode .........
Contents (continued) Measuring Current..................................................................................................... Measuring Frequency................................................................................................ Measuring Duty cycle ................................................................................................ Measuring Pulse Width..............................................................................................
287/289 Users Manual Error Messages ............................................................................................................. Maintenance .................................................................................................................. General Maintenance................................................................................................ Testing the Fuses......................................................................................................
List of Tables Table Title Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Symbols................................................................................................................................. Push Buttons ......................................................................................................................... Display Features ................................................................................................................... Rotary Switch Positions........
287/289 Users Manual vi
List of Figures Figure Title Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Push Buttons ......................................................................................................................... Display Features ................................................................................................................... Rotary Switch ........................................................................................................................
287/289 Users Manual 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. Conductance Measurement .................................................................................................. Capacitance Measurement ................................................................................................... Diode Testing........................................................................................................................ Current Measurement Setup............................
Safety Information Introduction XWWarning Read “Safety Information” before using this Meter. The descriptions and instructions in this manual apply to the model 289 and model 287 True-rms Digital Multimeters (hereafter referred to as the Meter). The model 289 appears in all illustrations.
287/289 Users Manual 2 • Make sure the battery door is closed and latched before operating the Meter. • Remove test leads from the Meter before opening the battery door. • Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads before you use the Meter. • Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth ground.
True-rms Digital Multimeters Hazardous Voltage • Use proper protective equipment, as required by local or national authorities when working in hazardous areas. • Do not remove batteries while the Meter is turned on or a signal is applied to the Meter’s input jacks. • Comply with local and national safety requirements when working in hazardous locations. • Before measuring current, check the Meter's fuses. (See "Testing the Fuses" in the Users Manual on the accompanying CD.
287/289 Users Manual Symbols Table 1 lists and describes the symbols used on the Meter and in this manual. Table 1.
True-rms Digital Multimeters Features Table 2. Push Buttons Features Button Tables 2 through 5 briefly describe the Meter’s features. Understanding the Push Buttons O The 14 push buttons on the front of the Meter activate features that augment the function selected using the rotary switch, navigate menus or control power to Meter circuits. The buttons shown in Figure 1 are described in Table 2. est02.emf 12 34 Function Turns the Meter on or off.
287/289 Users Manual Using Auto Repeat For some menu selections, holding down a softkey or cursor button will continuously change (or advance) a selection until the button is released. Normally, each press of a button causes the selection to change once. During some selections, the selections will change faster if the button is held for two or more seconds. This is helpful when scrolling through a list of selections, such as a list of stored measurements.
True-rms Digital Multimeters Features Table 3. Display Features Understanding the Display Display features shown in Figure 2 are described in Table 3 and the following sections. 7 6 10 11 123.45 VAC 8:10pm REL 5 0 100 200 300 AutoHOLD Save 14 mVAC Crest Factor 5 mVDC Auto Range 500 VAC 60.000 Hz 2 15 16 Setup 1 est01.eps Figure 2. Display Features A Softkey labels Indicates the function of the button just below the displayed label.
287/289 Users Manual Table 3. Display Features (cont.) Item Function J Minimeasurement Displays the lightning bolt (when necessary) and the input value when the primary and secondary displays are covered by a menu or pop-up message. K Date Indicates the date set in the internal clock. L Beeper Indicates the Meter’s beeper is enabled (not associated with the continuity beeper). M Units Indicates the units of measure. N Auxiliary Units Indicates unitless measurements like Crest Factor.
True-rms Digital Multimeters Features The mini-measurement display shows the measurement value of the primary function, if it is not already shown in the page area of the display. For example, when the display is frozen for a HOLD, the mini-measurement display continues to show the input signal (Live) measurement and a mini z. In addition, the minimeasurement display will flash, if z (for inputs above 30 volts) would normally appear in the primary display but is obscured.
287/289 Users Manual Table 4. Rotary Switch Positions Understanding the Rotary Switch Select a primary measurement function by positioning the rotary switch to one of the icons around its perimeter. For each function, the Meter presents a standard display for that function (range, measurement units, and modifiers). Button choices made in one function do not carry over into another function. The model 289 offers two additional functions: low ohms (Y) and low impedance (LoZ) ac volts.
True-rms Digital Multimeters Features Table 5. Input Terminals Using the Input Terminals All functions except current use the W and COM input terminals. The two current input terminals (A and mA/μA) are used as follows: Terminal A Current from 0 to 400 mA, use the € and COM terminals. Current between 0 and 10 A use the A and COM terminals. € COM Description Input for 0 A to 10.00 A current (20VA overload for 30 seconds on, 10 minutes off), frequency, and duty-cycle measurements.
287/289 Users Manual Table 6. Battery Level Indicator Controlling Meter Power The Meter is powered by six AA batteries and controlled through a front panel power switch and internal circuits designed to help conserve battery power. The following sections describe several techniques for controlling Meter power. Powering the Meter On and Off Manually With the Meter off, press O to turn on the Meter. Pressing O while the Meter is on causes it to turn off.
True-rms Digital Multimeters Selecting the Range recording mode, the time period is five minutes. For MIN MAX, Peak and AutoHold modes, the time period is the same time the Auto Off feature is set for. See the “Setting Backlight and Auto Off Timeouts” section later in this manual. Battery saver mode conserves battery power by shutting down circuits not necessary for the selected function, including the display.
287/289 Users Manual In most cases, the softkeys revealed by the menu selection act like toggles. The example menu shown in Figure 5 shows REL, REL%, and Close softkeys. In this example, the Meter is not in the relative mode, so pressing the softkey labeled REL would activate, or toggle, the relative mode. If, on the other hand the Meter is already in the relative mode, pressing the same softkey would disable the relative function. Menu VAC REL Peak, CF REL Hz, %, mS dBm dBV REL% Close est05.
True-rms Digital Multimeters Input Alert™ Feature press 5 to scroll the screen horizontally and reveal the off-screen menu items. Conversely, with the menu selector on an item in the right-hand column, press 6 to reveal the off-screen menu items. The information revealed through I is not meant to replace the more detailed information found in this manual. Function and feature explanations are brief and only meant to refresh a person’s memory.
287/289 Users Manual out open lead conditions so the Meter leads can be moved between test points without triggering a display update. Note For temperature measurements, the AutoHold threshold is a percent of 100 degrees. The default AutoHold threshold is 4% of 100 degrees, or 4 degrees Celsius or Fahrenheit. Pressing H while in AutoHold mode, forces the Meter’s display to update with the present measurement, just as if a stable measurement had been detected.
True-rms Digital Multimeters Capturing Minimum and Maximum Values Note For input signals that are noisy or change rapidly, turn on the Smoothing mode to display a steadier reading. See the “Enabling and Disabling the Smoothing Mode” section later in this manual. To extend battery life during MIN MAX recording, the Meter will enter a battery saver mode. See the “Setting Backlight and Auto Off Timeouts” section for more information on the battery saver mode. To activate the MIN MAX mode, press M.
7/289 Users Manual the softkey labeled Save to store the MIN MAX screen data. MIN MAX can not be continued at this point. Press the softkey labeled Close to exit the MIN MAX mode. Pressing the softkey labeled Restart while MIN MAX is running stops the MIN MAX session, discards all MIN MAX data, and immediately starts a new MIN MAX recording session. Capturing Peak Values Peak record is almost the same as MIN MAX record explained earlier in this manual.
True-rms Digital Multimeters Capturing Peak Values Pressing the softkey labeled Stop ends the peak recording session. The summary information in the display freezes and the softkeys change function to allow saving the collected data. Pressing the softkey labeled Close exits the peak recording session without saving the collected data. Note Turning the rotary switch before saving the peak recording data will cause all the accumulated data to be lost.
287/289 Users Manual Low Pass Filter (Model 289 only) The Meter is equipped with an ac low pass filter. When measuring ac voltage, or Vac frequency, press the softkey labeled Menu to open the function menu, and move the menu selector to the l item. Next, press the softkey labeled l to toggle the low pass filter mode on (l displayed) and off. XWWarning To avoid possible electric shock or personal injury, do not use the Low Pass Filter option to verify the presence of hazardous voltages.
True-rms Digital Multimeters Making Relative Measurements Making Relative Measurements The Meter displays calculated values that are based on a stored value when set to relative and relative percent mode. Figure 9 shows the functions for which the two relative modes are available. In addition, the two relative modes are available in frequency, duty cycle, pulse width, crest factor, and dB. secondary display.
287/289 Users Manual Making Measurements The following sections describe how to take measurements with the Meter. Measuring AC Voltage The Meter displays ac voltage measurements as rms (root mean square) readings. The rms value is the equivalent dc voltage that would produce the same amount of heat in a resistance as the measured voltage. True-rms readings are accurate for sine waves and other wave forms (with no dc offset) such as square waves, triangle waves, and staircase waves.
True-rms Digital Multimeters Making Measurements 8:10pm Using LoZ for Voltage Measurements (Model 289 only) W Caution Do not use the LoZ mode to measure voltages in circuits that could be damaged by this mode’s low impedance (≈3 kΩ). In LoZ, both R and M are disabled. There are no additional modes for this function and the softkey labeled Menu is therefore disabled as well.
287/289 Users Manual To select another reference value, press the softkey labeled Ref to display a message box with the current reference value. Pressing 7 or 8, scrolls through the nine predefined references: 4, 8, 16, 25, 32, 50, 75, 600, and 1000. Set the reference by pressing the softkey labeled OK. To add a custom reference impedance, see the “Setting a Custom dBm Reference” section later in this manual. A dBV measurement uses a 1 volt reference voltage to compare the present measurement against.
True-rms Digital Multimeters Making Measurements Measuring DC Voltage The Meter displays dc volts values as well as their polarity. The bar graph for dc voltage measurements is a zero-centered bar graph. Positive dc voltages cause the bar graph to fill to the right of center while negative dc voltages fill left of center. To measure a dc voltage with the Meter, rotate the rotary switch to the U or N position as shown in Figure 12.
287/289 Users Manual indicate AC+DC (F1), AC,DC (F2), and DC,AC (F3). Press the softkey that presents these two signals as needed. Measuring AC and DC Signals The Meter is capable of displaying both ac and dc signal components (voltage or current) as two separate readings or one AC+DC (rms) value combined. As shown in Figure 13, the Meter displays ac and dc combinations three ways: ac displayed over dc (AC,DC), dc displayed over ac (DC,AC), and ac combined with dc (AC+DC).
True-rms Digital Multimeters Making Measurements only when both the ac and dc signals drop below 10% of the present range. For AC+DC, ranging is controlled by the underlying values of the ac and dc signals and not by the sum of the AC+DC calculation. To exit the AC+DC mode, press the softkey labeled Menu and select the default mode for the selected function. For dc volts and dc millivolts functions, move the menu selector to VDC and press the softkey labeled VDC.
287/289 Users Manual Measuring Temperature XW Warning 8:10pm 06/13/07 26.5 To avoid the potential for fire or electric shock, do not connect the thermocouple to electrically live circuits. C +8.0 Offset Menu Save Offset Setup The Meter uses an 80BK-A Integrated DMM Temperature Probe or other type-K temperature probe for measuring temperature. To measure temperature, set up the Meter as shown in Figure 14. Press the softkey labeled Menu and move the menu selector to the menu item labeled Temp.
True-rms Digital Multimeters Making Measurements To input a temperature offset value, press the softkey labeled Offset to open a message box with the present offset value. Use 6 and 5 to position the cursor over one of the digits or the polarity sign. Use 7 and 8 to scroll through the numbers for each digit in the offset or switch between a + or – offset. With the desired value displayed, press the softkey labeled OK to set the temperature offset. When set to something other than 0.
287/289 Users Manual In-Circuit Resistance Measurements 8:10pm 06/13/07 5.67 0 100 200 300 400 Isolating a Potentiometer Circuit Power OFF Auto Range 500 1 Menu Save 3 2 Setup Disconnect 2 1 3 Isolating a Resistor Disconnect est11.eps Figure 15.
True-rms Digital Multimeters Making Measurements Using the Y Function (Model 289 Only) W Caution To avoid damaging the circuit under test, be aware the Meter sources current up to 10 mA at an open circuit voltage up to 20 volts. To measure low resistances with the Meter, position the rotary switch to Y. This function has a single range and R is therefore disabled when the Meter is in the Y function. measurement response of the Meter will not appear in the digital display.
287/289 Users Manual For in-circuit tests, turn circuit power off. Beep on short 8:10pm 100 8:10pm 06/13/07 5.67 0 Beep on open 200 300 400 06/13/07 OL Continuity 500 0 100 200 Beep on SHORT Menu Save 300 Continuity 400 500 Beep on OPEN Setup Menu Save Setup ON (closed) OFF (open) ON (closed) OFF (open) est13.eps Figure 17.
True-rms Digital Multimeters Making Measurements To change whether the beeper sounds on shorts or opens, press the softkey labeled Menu. Move the menu selector to the menu item labeled Beeper and press the softkey labeled Short/O…. This beeper selection, Beep on Short or Beep on Open, is displayed just above the continuity indicator. The continuity beeper is always enabled when continuity mode if first entered. To enable or disable the beeper for continuity, press the softkey labeled Menu.
287/289 Users Manual Using Conductance for High Resistance Tests Conductance, the inverse of resistance, is the ability of a circuit to pass current. High values of conductance correspond to low values of resistance. The unit of conductance is the Siemens (S). The meter’s 50 nS range measures conductance in nanosiemens (1 nS = 0.000000001 Siemens).
True-rms Digital Multimeters Making Measurements Measuring Capacitance W Caution To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the dc voltage function to confirm that the capacitor is discharged. 8:10pm 06/13/07 26.52 Menu Save Auto Range 100 uF Setup Capacitance is the ability of a component to store an electrical charge. The unit of capacitance is the farad (F).
287/289 Users Manual To measure capacitance, position the rotary switch to P and set up the Meter as shown in Figure 19. If the display doesn’t already indicate the Meter is measuring capacitance, press the softkey labeled Menu. Next, move the menu selector to the menu item labeled Diode,Cap and press the softkey labeled Cap. Note To improve measurement accuracy of small value capacitors, press Menu and move the menu selector to the menu item labeled REL.
True-rms Digital Multimeters Making Measurements Typical Reading 8:10pm .567 0 1 8:10pm 06/13/07 2 3 4 VDC 06/13/07 VDC OL Manual Range 5 VDC 0 1 2 3 4 Manual Range 5 VDC Reverse Bias Menu Save Setup Menu Save Setup + Forward Bias + est16.eps Figure 20.
287/289 Users Manual 2. Measuring Current XW Warning To avoid damage to the Meter and possible injury, never attempt an in-circuit current measurement where the open-circuit potential to earth is greater than 1000 V. Note To avoid blowing the Meter’s 440 mA fuse, use the mA/μA terminal only if you are sure the current is less than 400 mA. 3. If you are using the A terminal, set the rotary switch to A.
True-rms Digital Multimeters Making Measurements Note While in a current measurement function, the Meter will stay in the selected AC or DC current measurement mode when switching between n and €. Whenever switched to one of the current measurement functions, the Meter will default to the last current type selected (AC or DC).
287/289 Users Manual 8:10pm 2.5527 0 1 Menu 8:10pm 06/13/07 2 Save 3 4 AAC 19.783 Auto Range 5 AAC Setup 0 1 Menu 8:10pm 06/13/07 2 Save 3 4 mAAC 4.863 Auto Range 5 AAC Setup 06/13/07 0 1 Menu 2 Save 3 4 uAAC Auto Range 5 AAC Setup est18.eps Figure 21.
True-rms Digital Multimeters Making Measurements 8:10pm 06/13/07 mAAC Total current to circuit Circuit Power: OFF to connect meter. ON for measurement. OFF to disconnect meter. Current through one component est19.eps Figure 22.
287/289 Users Manual W Caution Figure 23 highlights the functions that allow frequency measurements. Placing the probes across (in parallel with) a powered circuit when a lead is plugged into a current terminal can damage the circuit you are testing and blow the Meter's fuse. This can happen because the resistance through the Meter's current terminals is very low, so the Meter acts like a short circuit.
True-rms Digital Multimeters Making Measurements selector to the menu item labeled Hz,%,ms. Next press the softkey labeled Hz. 8:10pm Selection between a rising trigger c or falling trigger dedge is performed by pressing the softkey labeled c d. This softkey toggles the trigger setting between the two selections. 06/13/07 The following are tips for frequency measurements: If a reading shows as 0 Hz or is unstable, the input signal may be below or near the trigger level.
287/289 Users Manual Measures Positive Pulse Trigger Level 30% Above Trigger Level 100% Measures Negative Pulse Trigger Level 70% Below Trigger Level 100% est28.eps Figure 25.
True-rms Digital Multimeters Making Measurements To measure duty cycle, position the rotary switch on one of the functions allowing frequency measurements shown in Figure 23. Press the softkey labeled Menu and move the menu selector to the menu item labeled Hz,%,ms. Next press the softkey labeled %. 8:10pm 06/13/07 123.45 VAC 49.75 0 100 200 300 400 Save The pulse polarity is displayed to the right of the duty cycle value. J indicates a positive pulse and K indicates a negative pulse.
287/289 Users Manual Measure Positive Pulse Width Trigger Level Pulse Width 1 Period = Frequency Measure Negative Pulse Width Trigger Level Pulse Width Period est27.eps Figure 27.
True-rms Digital Multimeters Changing Meter Setup Options The primary display indicates the input signals pulse width in milliseconds. The frequency of the signal is displayed in the secondary display. The mini-measurement display indicates the volts or amps value of the input signal. The bar graph tracks the volts or amps value of the signal and not the pulse width value. The pulse width polarity is displayed to the right of the duty cycle value.
287/289 Users Manual Setting Date and Time The Meter’s internal clock is used in the display and for timestamping recorded measurements. To change the date and time as well as the display format, press the softkey labeled Setup. Position the menu selector next to the menu item labeled Display. To set the date and time, press the softkey labeled Date/Time to open the date/time menu. Next, position the menu selector next to either the Set Date item or Set Time item and press the softkey labeled Edit.
True-rms Digital Multimeters Using Memory Enabling and Disabling the Smoothing Mode Using Memory When an AC input signal is noisy or changes rapidly, the smoothing mode may display a steadier reading. To enable or disable the smoothing mode, press the softkey labeled Setup and position the menu selector next to the menu labeled Instrument. Next press the softkey labeled Instrument and position the menu selector next to the menu item labeled Smoothing.
287/289 Users Manual saved under the name of Save-2. The auto-incrementing number can be reset to 1 by positioning the menu selector next to the save name and then pressing the softkey labeled Reset #. To save a screen shot, a recording session, or MIN MAX or Peak record session, press the softkey labeled Save. To select the name from the preset list, press +Name. To save to the same name as before but with the next number, press the softkey labeled Save.
True-rms Digital Multimeters Using Memory Note X-axis time labels are shown in elapsed time while the timestamp shown under the cursor is an absolute time Table 7. Trend Data Display 3 2 1 01/16/08 09:43:17am 30 10 0:30 0:45 HH:MM 1:00 1:15 23.456 VAC 08:13:05 6/28/07 5 6 est35.eps Description A Cursor B Start date and time C Trend line D Zoom level. Time scale legend (HH:MM or MM:SS) G Measured value and timestamp of selected record.
287/289 Users Manual softkeys labeled Prev and Next to select an item for deletion. Next, press the softkey labeled Delete. A message asking to confirm the deletion will appear before anything is deleted from memory. Recording Measurement Data The Meter’s record feature collects measurement information over a user-specified duration. This collection of information is called a recording session. A recording session is made up of one or more measurement records.
True-rms Digital Multimeters Recording Measurement Data • Recording session duration expiring. • Manually stopping the recording session. Table 8. Recording Display 8:10pm 06/13/07 123.45 VAC Setting up a Recording Session Before starting a recording session, setup the Meter for the measurements to be recorded. If needed, change the event threshold value (see the “Setting the Event Threshold Value section later in this manual). Press the softkey labeled Save to open the save menu.
287/289 Users Manual The Meter allocates memory in such a way as to guarantee capturing all of the user-specified sample intervals. Event records will also be captured until the Meter detects the allocated memory has been used up. At this point, events are not recorded, but the event counter continues to advance to indicate the total number of events that occurred. A plus (+) sign appears after the event count to indicate this condition. Note The maximum number of recorded sample intervals is 10,000.
True-rms Digital Multimeters Using Communications Table 9. Stopped Recording Display Using Communications You can use the IR communication link and FlukeView Forms software to transfer the contents of a meter’s memory to a PC. 1 8:10pm 123.45 VAC REL Stopped 1.75 0 6 5 100 200 300 When using a PC-to-meter IR (infrared) communication link, refer to the FlukeView Forms Installation Guide or the on-line help.
287/289 Users Manual Error Messages Table 10 list some of the error messages the Meter may display and the conditions that may be causing the error. Table 10. Error Messages Message Leads connected incorrectly. Conditions Lead in A or mA/μA jack but rotary switch not in corresponding A/mA or μA position. Leads in both A and mA/μA jacks. Rotary switch set to measure current but no lead in either A or mA/μA jack. Open Thermocouple Thermocouple wire is open or thermocouple junction is corroded.
True-rms Digital Multimeters Maintenance Testing the Fuses Maintenance XWWarning To avoid electrical shock or personal injury, repairs or servicing not covered in this manual should be performed only by qualified personnel as described in the 287/289 Service Information. General Maintenance Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives, isopropyl alcohol, or solvents.
287/289 Users Manual 8:10pm 10.000 Menu 06/13/07 k Replace F1 if reading is OL 8:10pm 06/13/07 0.50 Replace F2 if reading is OL Menu est33.eps Figure 28.
True-rms Digital Multimeters Maintenance Replacing the Batteries Refer to Figure 30 and replace the batteries as follows: 1. Turn the Meter off and remove the test leads from the terminals. 2. Remove the battery door assembly by using a standardblade screwdriver to turn the battery door screw one-half turn counterclockwise. 3. Replace the batteries with 1.5 volt AA batteries (NEDA 15A IEC LR6). Observe proper polarity. 4.
287/289 Users Manual F2 11 A F1 0.44 A est32.eps Figure 30.
True-rms Digital Multimeters In Case of Difficulty In Case of Difficulty If the Meter does not seem to work properly: 1. Check that all batteries are installed with the correct polarity. 2. Examine the case for damage. If damage is detected, contact Fluke. See the “Contacting Fluke” section earlier in this manual. 3. Check and replace (as needed) the batteries, fuses, and test leads. 4. Review this manual to verify correct operation. 5.
287/289 Users Manual Service and Parts Replacement parts and accessories are shown in Tables 11 and 12 and Figure 31. To order parts and accessories, refer to the “Contacting Fluke” section. Table 11. Replacement Parts Item Qty.
True-rms Digital Multimeters Service and Parts Table 11. Replacement Parts (cont.) Item Description Qty. Fluke Part/Model Number 13 RSOB Housing, Lower 1 2578290 14 Case Bottom 1 2578184 15 Shock Absorber, Battery Compartment 1 2793525 16 Battery Contact, Negative 2 2578375 17 Battery Contact, Positive 1 2578353 18 WFuse (F1), 0.440 A, 1000 V, FAST, Interrupt rating 10 kA 1 943121 19 WFuse (F2), 11 A, 1000 V, FAST, Interrupt rating 20 kA 1 803293 20 Battery, 1.
287/289 Users Manual 1 23 2 14 3 16 4 5 24 15 18 25 17 7 6 4 PL 19 8 2 PL 20 9 10 11 26 21 22 6 PL 12 13 est40.eps Figure 31.
True-rms Digital Multimeters Service and Parts Table 12.
287/289 Users Manual General Specifications Maximum voltage between any Terminal and Earth Ground: 1000 V W Fuse Protection for mA or μA inputs .............0.44 A (44/100 A, 440 mA), 1000 V FAST Fuse, Fluke specified part only W Fuse Protection for A input.............................11 A, 1000 V FAST Fuse, Fluke specified part only Battery Type ..........................................................6 AA Alkaline batteries, NEDA 15A IEC LR6 Battery Life .................................................
True-rms Digital Multimeters Detailed Specifications Electromagnetic Compatibility Standards (EMC) European EMC....................................................EN61326-1 Australian EMC ...................................................; N10140 US FCC ...............................................................FCC CFR47: Part 15 CLASS A Certifications .........................................................
287/289 Users Manual AC Voltage Specifications Function AC mV Range [5] [1] 50 mV 500 mV [1] 5V [1] 50 V [1] 500 V 1000 V [3] -70 to -62 dB [3] -62 to -52 dB [3] -52 to -6 dB [3] -6 to +34 dB [3] 34 to 60 dB AC V dBV Low pass filter 0.001 mV 0.01 mV 0.0001 V 0.001 V 0.01 V 0.1 V 0.01 dB 0.01 dB 0.01 dB 0.01 dB 0.01 dB 20 to 45 Hz 45 to 65 Hz 1.5 % + 60 1.5 % + 60 1.5 % + 60 1.5 % + 60 1.5 % + 60 1.5 % + 60 3 dB 1.5 dB 0.2 dB 0.2 dB 0.2 dB 0.3 % + 25 0.3 % + 25 0.3 % + 25 0.3 % + 25 0.
True-rms Digital Multimeters Detailed Specifications AC Current Specifications Function [3] AC μA AC mA AC A [2] [3] Range Resolution 500 μA 0.01 μA 5000 μA 50 mA 400 mA 5A [1] 10 A 0.1 μA 0.001 mA 0.01 mA 0.0001 A 0.001 A [1] 10 A range (10 % to 100 % of range). [2] 20 A for 30 seconds on, 10 minutes off. >10 A not specified. [3] 400 mA continuous; 550 mA for 2 minutes on, 1 minute off. [4] Verified by design and type tests. 20 to 45 Hz 1 % + 20 Accuracy 45 to 1 kHz 1 to 20 kHz 0.
287/289 Users Manual DC Voltage Specification Function DC mV DC V L [1] [1] Range [3] Resolution 50 mV 500 mV 5V 50 V 500 V 1000 V 0.001 mV 0.01 mV 0.0001 V 0.001 V 0.01 V 0.1 V 1000 V 0.1 V DC Accuracy [2] AC over DC, DC over AC, AC + DC 20 to 45 Hz 45 Hz to 1 kHz 1 to 20 kHz 20 to 35 kHz [2] [4] 0.05 % + 20 [5] 0.025 % + 2 0.025 % + 2 0.025 % + 2 0.03 % + 2 0.03 % + 2 2 % + 80 1 % + 20 Not Spec’d 0.5 % + 80 1.5 % + 40 1.5 % + 40 1.5 % + 40 1.
True-rms Digital Multimeters Detailed Specifications DC Current Specifications Function [4] DC μA DC mA DC A [2] [4] Range Resolution DC Accuracy [1] AC over DC, DC over AC, AC + DC [1][3] 20 to 45 Hz 45 Hz to 1 kHz 1 to 20 kHz [5] 20 to 100 kHz 500 μA 0.01 μA 0.075 % + 20 1 % + 20 0.6 % + 20 0.6 % + 20 5000 μA 50 mA 400 mA 5A 10 A 0.1 μA 0.001 mA 0.01 mA 0.0001 A 0.001 A 0.075 % + 2 1%+5 0.6 % + 5 0.6 % + 10 5 % + 40 1 % + 20 1%+5 1.5 % + 20 1.5 % + 10 0.6 % + 20 0.6 % + 5 0.
287/289 Users Manual Resistance Specifications Function Range 50 Ω Resistance [1][3] 500 Ω [1] [1] 0.15 % + 20 0.01 Ω 0.05 % + 10 0.05 % + 2 0.001 kΩ 0.05 % + 2 0.01 kΩ 0.05 % + 2 5 MΩ 0.0001 MΩ 0.15 % + 4 30 MΩ 0.001 MΩ 1.5 % + 4 50 MΩ 0.01 MΩ 1.5 % + 4 50 MΩ up to 100 MΩ 0.1 MΩ 3.0 % + 2 100 MΩ up to 500 MΩ [2] 50 nS 0.1 MΩ 0.01 nS 1 % + 10 50 kΩ [1] 500 kΩ [1] Accuracy 0.001 Ω 0.
True-rms Digital Multimeters Detailed Specifications Capacitance and Diode Test Specifications Function Capacitance Diode Test [1] Range [1] Resolution Accuracy 1 nF [1] 10 nF [1] 100 nF 0.001 nF 0.01 nF 0.1 nF 1%+5 1%+5 1%+5 1 μF 0.001 μF 1%+5 10 μF 0.01 μF 1%+5 100 μF 0.1 μF 1%+5 1000 μF 10 mF 100 mF 3.1 V 1 μF 0.01 mF 0.1 mF 0.0001 V 1%+5 1%+5 2 % + 20 1 % + 20 With a film capacitor or better, using relative mode (REL Δ) to zero residual.
287/289 Users Manual Frequency Counter Specifications Function Frequency (0.5 Hz to 999.99 kHz, pulse width >0.5 μs) [2][3] Duty Cycle [2][3] Pulse Width Range 99.999 Hz 999.99 Hz 9.9999 kHz 99.999 kHz 999.99 kHz 1.00 % to 99.00 % 0.1000 ms 1.000 ms 10.00 ms 1999.9 ms Resolution 0.001 Hz 0.01 Hz 0.0001 Hz 0.001 Hz 0.01 Hz 0.01 % 0.0001 ms 0.001 ms 0.01 ms 0.1 ms Accuracy 0.02 % + 5 0.005 % + 5 0.005 % + 5 [1] 0.005 % + 5 0.005 % + 5 0.2 % per kHz + 0.1 % 0.002 ms + 3 counts 0.002 ms + 3 counts 0.
True-rms Digital Multimeters Detailed Specifications Frequency Counter Sensitivity Input Range 50 mV 500 mV 5V 50 V 500 V 1000 V Input Range Approximate Voltage Sensitivity [1] (rms sine wave) 15 Hz to 100 kHz 5 mV 25 mV 0.25 V 2.5 V 25 V 50 V Approximate Current Sensitivity (rms sine wave) 15 Hz to 10 kHz AC Bandwidth Approximate DC Trigger Levels [2] 1 MHz 1 MHz 700 kHz 1 MHz 300 kHz 300 kHz AC Bandwidth 500 μA 25 μA 100 kHz 5000 μA 50 mA 400 mA 5A 10 A 250 μA 2.5 mA 25 mA 0.25 A 1.
287/289 Users Manual MIN MAX, Recording, and Peak Specifications Function Nominal Response 200 ms to 80% (dc function) MIN MAX, Recording 350 ms to 80 % (ac function) 250 μS (peak) Peak Crest Factor [1] [1] 350 ms to 80 % For repetitive peaks; 2.5 ms for single events. Peak not specified for 500 µA DC, 50 mA DC, 5 A DC. [2] 200 counts in 500 mV AC, 500 μA AC, 50 mA AC, 5 A AC. [3] 3 % in 500 mV AC, 500 μA AC, 50 mA AC, 5 A AC.
True-rms Digital Multimeters Detailed Specifications Input Characteristics Function Overload [1] Input Impedance Protection 1000 V L [2] Common Mode Rejection Ratio (1 kΩ unbalance) 10 MΩ <100 pF >120 dB at dc, 50 Hz or 60 Hz >60 dB at 50 Hz or 60 Hz 10 MΩ <100 pF >120 dB at dc, 50 Hz or 60 Hz >60 dB at 50 Hz or 60 Hz F mV 1000 V K 1000 V 10 MΩ <100 pF (ac-coupled) >60 dB, dc to 60 Hz L 1000 V 3.
287/289 Users Manual Burden Voltage (A, mA, μA) Function mA, μA A 78 Range Burden Voltage 500 μA 102 μV/ μA 5000 μA 50.000 mA 400.00 mA 5.0000 A 10.000 A 102 μV/ μA 1.8 mV/mA 1.8 mV/mA 0.04 V/A 0.
