27 II/28 II Digital Multimeters Calibration Information Introduction XWWarning To avoid electric shock or injury, do not perform the performance tests or calibration adjustment procedures unless qualified to do so. The information provided in this document is for the use of qualified personnel only. The 27 II/28 II Calibration Information provides adjustment and performance test procedures for the Fluke Model 27 II and 28 II Digital Multimeters (hereafter known as the Meter).
7 II/28 II Calibration Information Safety Information "Warning" and "Caution" Statements A Warning identifies hazardous conditions and actions that could cause bodily harm or death. A Caution identifies conditions and actions that could damage the Meter, the equipment under test, or cause permanent loss of data.
Digital Multimeters Safety Information • When making electrical connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead. • Do not use the Meter if it operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced. • Do not use the Meter around explosive gas, vapor or in damp or wet environments. • Use only three 1.
27 II/28 II Calibration Information Electrical Symbols Table 1 lists the electrical symbols that appear in this document and on the Meter Table 1. Symbols B AC (Alternating Current) J F DC (Direct Current) I Fuse X Hazardous voltage P Conforms to European Union directives. W Risk of Danger. Important information. See Manual. ) Conforms to relevant Canadian Standards Association directives. Battery. Low battery when displayed.
Digital Multimeters General Specifications General Specifications Maximum voltage between any terminal and earth ground ........................................... 1000 V rms W Fuse for mA inputs .................................................. 440 mA, 1000 V FAST Fuse W Fuse for A inputs ..................................................... 11 A, 1000 V FAST Fuse Display Digital..........................................................................
27 II/28 II Calibration Information 28 II AC Voltage AC conversions are ac-coupled and valid from 3 % to 100 % of range. Range Resolution 600.0 mV 6.000 V 60.00 V 600.0 V 1000 V 0.1 mV 0.001 V 0.01 V 0.1 V 1V 45 – 65 Hz ±(0.7 % + 4) ±(1.0 % + 4) ±(1.0 % + 4) [1] 1 – 5 kHz 5 – 20 kHz ±(2 % + 4) ±(2 % + 20) [1] +1.0 % + 4 [4] -6.0 % - 4 Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified ±(2 % + 4) ±(0.
Digital Multimeters Detailed Specifications AC Current Accuracy Function μA ac mA ac A ac Range Resolution Burden Voltage 600.0 μA 0.1 μA 100 μV/μA 6000 μA 1 μA 100 μV/μA 60.00 mA 0.01 mA 1.8 mV/mA 0.1 mA 1.8 mV/mA 400.0 mA [4] 6.000 A 10.00 A [5,6] 0.001 A 0.03 V/A 0.01 A 0.03 V/A [1, 2] [3] 27 II (40 Hz – 1 kHz) 28 II (45 Hz – 2 kHz) ±(1.5 % + 2) ±(1.0 % + 2) [1] AC conversion for the 27 II is ac coupled and calibrated to the rms value of a sine wave input.
27 II/28 II Calibration Information Frequency Counter Sensitivity and Trigger Levels Minimum Sensitivity (RMS Sine Wave) 5 Hz – 20 kHz 0.5 Hz – 200 kHz Input Range Approximate Trigger Level (DC Voltage Function) 600 mV dc 600 mV ac 6V 60 V 70 mV (to 400 Hz) 150 mV 0.3 V 3V 70 mV (to 400 Hz) 150 mV 0.7 V 40 mV 1.7 V 7 V (≤140 kHz) 4V 600 V 30 V 70 V (≤14.0 kHz) 40 V 1000 V 100 V 200 V (≤1.4 kHz) 100 V Duty Cycle (Vdc and mVdc) Range Accuracy 0.0 % to 99.9 % [1] [1] Within ± (0.
Digital Multimeters Basic Maintenance Basic Maintenance XWWarning To avoid possible electric shock or personal injury, repairs or servicing covered in this manual should be performed only by qualified personnel. General Maintenance Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings and can falsely activate the Input Alert feature. Clean the terminals as follows: 1.
27 II/28 II Calibration Information How to Replace the Batteries XWWarning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator () appears. If the display shows “batt” the Meter will not function until the battery is replaced. Replace the battery as follows, refer to Figure 2: 1. Turn the rotary switch to OFF and remove the test leads from the terminals. 2.
Digital Multimeters 1 3 4 2 6 5 Figure 2. Battery and Fuse Replacement gaq10.eps Performance Tests XWWarning To avoid electric shock, do not perform the performance test procedures unless the Meter is fully assembled. The following performance tests verify the complete operation of the Meter and check the accuracy of each Meter function against its specifications. Performance tests should be performed bi-annually to ensure that the Meter is within accuracy specifications.
27 II/28 II Calibration Information Required Equipment Table 2 lists the equipment required to conduct a performance test on the Meter. Table 2. Required Equipment Recommended Equipment 5520A Multi-product Calibrator (or equivalent) K-type Thermocouple, mini-plug on both ends 12 Measurement Function Accuracy DC Volts 0 to 1000 V ±0.012 % DC Current 350 μA to 2 A ±0.05 % AC Volts 0 to 1000 V ±0.15 % @ 60 Hz to 20 kHz ±3 % AC Current 350 μA to 2 A ±0.
Digital Multimeters Performance Tests Testing Meter Accuracy To test the accuracy of the Meter, perform the steps in Table 3. Table 3. Accuracy Tests Test Step 1 Function Range 5520A Output Display Reading 27 II 28 II 600 mV 60 mV, 60 Hz 59.4 to 60.6 59.2 to 60.8 600 mV 330 mV, 60 Hz 328.0 to 332.0 327.3 to 332.7 3 600 mV 600 mV, 13 kHz 575.0 to 625.0 586.0 to 614.0 4 6V 675 mV, 60 Hz 0.669 to 0.681 0.666 to 0.684 5 6V 3.3 V, 60 Hz 3.280 to 3.320 3.273 to 3.327 6 6V 3.
27 II/28 II Calibration Information Table 3. Accuracy Tests (cont.) Test Function Step 26 Range Display Reading 5520A Output 27 II 28 II 600 mV 50 mV dc 49.8 to 50.2 49.8 to 50.2 27 DC Volts 600 mV 330 mV dc 329.6 to 330.4 329.6 to 330.4 28 600 Ω 330 Ω ( Use 2 wire Comp) 329.1 to 330.9 329.1 to 330.9 29 6 kΩ 3.3 kΩ (Use 2 wire Comp) 3.292 to 3.308 3.292 to 3.308 30 60 kΩ 33 kΩ 32.92 to 33.08 32.92 to 33.08 31 600 kΩ 330 kΩ 329.2 to 330.8 329.2 to 330.
Digital Multimeters Calibration Adjustments Table 3. Accuracy Tests (cont.) Test Function Step Range Display Reading 5520A Output 27 II 28 II mVdc 4 Temperature – 28 II 0 °C N/A -1.0 to 1.0 100 °C N/A 98.0 to 102.0 Backlight Press backlight button Backlight comes on Backlight comes on 55 Press backlight button Backlight intensifies Backlight intensifies 56 Press backlight button Backlight goes off Backlight goes off 52 53 54 [1] [2] [3] [4] Remove test leads from unit.
27 II/28 II Calibration Information Changing the Password To change the password in the Meter: 1. Turn the Meter Rotary Switch from OFF to VAC mode while holding down the MINMAX pushbutton at the same time. The Meter will display Y CAL. 2. Press the AutoHOLD pushbutton twice. The display should show "????" 3. Using the pushbuttons select the old password (do not use AutoHOLD to save the password) 4. Press the RANGE pushbutton. The Meter should display "_ _ _ _" . 5.
Digital Multimeters Calibration Adjustments If the revision number is 010: 4. Remove the PCB from the top case. 5. Apply power to the PCB by clipping on a dc voltage between 3.5 V and 5 V at the test points marked “+” and “-” at the edge of the board. See Figure 3. 8 2X-2- 3001 REV 010 6 6 S11 2X-2- 3001 REV 010 7 5 TP1 7 S7 TP2 3.5 - 5 V Figure 3. Revision 010 Board Layout gaq101.eps 6. While shorting across keypad button S7, turn the rotary switch one position clockwise. See Figure 3. 7.
27 II/28 II Calibration Information If the revision number is 011 or higher: 4. Apply power to the PCB by clipping on a dc voltage between 3.5 V and 5 V at the test points marked “+” and “-” at the edge of the board. See Figure 4. 2X-2- 3001 REV 011 S11 6 S11 2X-2- 3001 REV 011 4 5 3.5 - 5 V Figure 4. Revision 011 Board Layout gaq102.eps 5. Turn the rotary switch from OFF to while holding down MIN MAX at the same time. The Meter should display CAL. 6.
Digital Multimeters Calibration Adjustments Other Pushbutton Functions Table 4 list the button on the Meter and describes what the button does when pressed after the password has been entered and pressed. Table 4. Pushbutton Functions During Cal Mode Button (yellow) Cal Mode Description Press and hold to test the present function. The measurement is not calibrated so it may be inaccurate. This is normal. Press and hold to display the required input level.
27 II/28 II Calibration Information Table 5. Fluke 27 II Calibration Adjustment Steps Function (Switch Position) Input Value C-01 0 mV, 0 Hz (AC Volts) C-02 6.0 mV, 60 Hz C-03 60.0 mV, 60 Hz C-04 600.0 mV, 60 Hz C-05 600.0 mV, 20 kHz C-06 6.0 V, 60 Hz C-07 6.0 V, 20 kHz C-08 60.0 V, 60 Hz C-09 60.0 V, 20 kHz C-10 600.0 V, 60 Hz C-11 600.0 V, 10 kHz C-12 6.0 V C-13 60.0 V C-14 600.0 V C-15 600.0 mV (DC Millivolts) C-16 60.00 mV (Ohms) C-17 600.0 Ω C-18 6.
Digital Multimeters Calibration Adjustments Table 5. Fluke 27 II Calibration Adjustment Steps (cont.) Function (Switch Position) (Microamps) Adjustment Step Input Value C-36 0.0 μA ac, 0 Hz C-37 30.0 μA, 60 Hz C-38 60.0 μA. 60 Hz C-39 600.0 μA, 60 Hz C-40 6000.0 μA, 60 Hz C-41 600.0 μA, 0 Hz C-42 6000.0 μA, 0 Hz Table 6. Fluke 28 II Calibration Adjustment Steps Function (Switch Position) (AC Volts) Adjustment Step Input Value C-01 600.0 mV, 60 Hz C-02 600.
27 II/28 II Calibration Information Table 6. Fluke 28 II Calibration Adjustment Steps (cont.) Function (Switch Position) (Microamps) Adjustment Step Input Value C-28 600.0 μA, 60 Hz C-29 6000 μA, 60 Hz C-30 600.0 μA dc C-31 6000 μA dc Disassembling the Meter To disassemble the Meter: 1. Use a Philips screwdriver to remove the six battery-door screws (H1). 2. Lift up the battery door (MP1) at the top end of the Meter and remove it from the case back. 3. Remove three AA batteries. 4.
Digital Multimeters Reassembling the Meter Reassembling the Meter Note Before reassembling the Meter, read the How to Retain the IP67 Rating section first. To reassemble the Meter, perform the disassembly steps in reverse order. How to Retain the IP67 Rating The following items identify parts of the Meter that can compromise the IP67 rating by leaking if assembly instructions are not followed carefully. 1. Knob: The knob has an overmolded seal that fits tight against the top case.
27 II/28 II Calibration Information Replacement Parts Table 7 lists the Meter’s replaceable parts identified in Figure 5. MP1 H1 (6) MP2 MP3 (2) BT1 (3) MP4 H2 (6) H3 (6) MP5 MP6 MP7 MP8 (2) MP9 H4 (7) H4 (7) H5 (4) MP10 F1 F2 MP14 MP11 MP12 DS1 MP13 MP15 MP16 MP17 MP18 MP19 MP20 Figure 5. Exploded View of Meter 24 gaq106.
Digital Multimeters Replacement Parts Table 7. Replaceable Parts List Item Description Part Number Qty. BT1 BATTERY,PRIMARY,ZNMNO2,1.5V,2.24AH,15A,LR6,ALKALINE,AA,14X50MM,BULK 376756 3 DS1 LCD,4.5 DIGIT,TN,TRANSFLECTIVE,BAR GRAPH,OSPR80,,FLUKE-87-5 2065213 1 F1 WFUSE,11A,1000V,FAST.406INX1.5IN,BULK 803293 1 F2 WFUSE,.440 A,1000V,FAST.406INX1.5IN,BULK 943121 1 H1 SCREW,M3X0.5,6MM,PAN,PHILLIPS,STEEL,ZINC-BLACK CHROMATE 2032792 6 H2 SCREW,5-14,.
27 II/28 II Calibration Information Table 7. Replaceable Parts List (cont.) Item Part Number Qty.
Digital Multimeters Replacement Parts 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.
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