22-812.fm Page 1 Monday, April 8, 2002 1:32 PM 68/4CPIG"&KIKVCN"/WNVKOGVGT YKVJ"2%"+PVGTHCEG 22-812 Auto-Ranging with Manual-Ranging Override — automatically selects a range when you measure voltage, current, resistance, capacitance, and frequency. You can also manually set the range when measuring values you know are within a certain range. Computer Interface with Supplied Software — you can connect the meter to your computer and use the supplied software to log and graph measurements.
2-812.fm Page 2 Monday, April 8, 2002 1:32 PM #"+/2146#06"# System Requirements Completely read this manual before you use this meter. %106'065 System Requirements ..... 2 A Word About Safety ....... 2 Special Panel Markings 4 Specifications .................. 5 A Quick Look at Your Meter ....................... 9 Preparation .................... 11 Installing a Battery ...... 11 Connecting the Test Leads .................. 11 Using the Stand .......... 12 Using the Rubber Boot ...............
22-812.fm Page 3 Monday, April 8, 2002 1:32 PM • Use extreme caution when working with voltages above 100V. Always disconnect power from the circuit you are measuring before you connect test leads to high-voltage points. • Never connect the test leads to a voltage source when you set the meter’s function selector to –/„, •, LOGIC/Hz, / µA/A, or / mA/A. • Always discharge any capacitors of the circuit under test before you attach test leads.
22-812.fm Page 4 Monday, April 8, 2002 1:32 PM ý R "9#40+0)ý (continued) • A Word About Safety • • R " Use extreme care while using the meter to measure current and voltage in commercial electrical panels. Unlike a home AC outlet, a commercial electrical panel has tremendous current surge potential. This is especially true for threephase industrial electrical panels. A small spark from one of these panels can cause a plasma explosion and fire that can severely burn you.
22-812.fm Page 5 Monday, April 8, 2002 1:32 PM 52'%+(+%#6+105 Accuracies at 73.4°F (23°C) ±5°, <75% RH DC VOLTS (Maximum Measurement: 1000V) 400mV ............................................... ± 0.3% of Reading, ± 4 in Last Digit 4V to 40V ........................................... ± 0.3% of Reading, ± 3 in Last Digit 400V .................................................. ± 0.5% of Reading, ± 3 in Last Digit 1000V ................................................ ± 0.
22-812.fm Page 6 Monday, April 8, 2002 1:32 PM AC CURRENT (Average Responds, RMS Calibrated, 10A Maximum, DC Coupled) 400µA ................................................ ± 1.0% of Reading, ± 5 in Last Digit 4mA ................................................... ± 0.8% of Reading, ± 3 in Last Digit 40mA ................................................. ± 1.0% of Reading, ± 5 in Last Digit 400mA ............................................... ± 0.8% of Reading, ± 3 in Last Digit 4A ......................
22-812.fm Page 7 Monday, April 8, 2002 1:32 PM The accuracy of these modes is determined by the external device and the accuracy of the DC volt mode. The temperature range of the newer 1mV per degree C probes are generally between –50°C and 1000°C. FREQUENCY Accuracy 400Hz – 4k–40k–400kHz–4MHz: .................................. ± 0.1% of Reading, ± 4 in Last Digit Sensitivity The function selector set to LOGIC/Hz (10Hz – 4MHz) 400Hz–4k–40kHz ............................................ 50 mVrms 400kHz ...
22-812.fm Page 8 Monday, April 8, 2002 1:32 PM LOGIC MODE Min. High-Level Voltage: ............................... 2.0V ± 0.2V Max. Low-Level Voltage: ............................... 1.0V ± 0.2V CONTINUITY BEEPER Continuity (short) .................................... ≤ 50 ± 30 Ohms Open ...................................................... > 50 ± 30 Ohms Open Circuit .................................................... < 2.8 Volts Short Circuit Current ......................................... < 2.
22-812.fm Page 9 Monday, April 8, 2002 1:32 PM / mA/A — measures current. / µA/A — measures current. Guard WARNING: THE GUARD PROTECTS AGAINST ELECTRIC SHOCK. DO NOT REMOVE IT. A Quick Look at Your Meter #"37+%-".11-"#6";174"/'6'4 • — measures ohms and capacitance. –/„ — checks continuity and diodes. LOGIC/Hz — measures frequency and logic. hFE — lets you measure the gain of small-signal, bipolar transistors.
22-812.fm Page 10 Monday, April 8, 2002 1:32 PM A Quick Look at Your Meter REL€ — lets you work with relative measurements. RANGE — selects auto or manual ranging. Hz/DUTY/WIDTH — measures frequency, duty cycle, and pulse width. SELECT — selects options. HOLD — holds a measurement value. dBm / ~ V — selects AC voltage measurement in dBm or volts. MAX/MIN — lets you store maximum and minimum readings. °C/°F / V— displays temperature and measures DC volts.
22-812.fm Page 11 Monday, April 8, 2002 1:32 PM 24'2#4#6+10 Your meter requires one 9-volt battery (not supplied) for power. For the best performance and longest life, we recommend a RadioShack alkaline battery." . 2. If the meter is on, rotate the function selector to OFF to turn it off. Then disconnect the test leads if they are connected. 3. Use a Phillips screwdriver to loosen the battery cover’s screw, then lift off the battery cover. 4.
22-812.fm Page 12 Monday, April 8, 2002 1:32 PM ±"016'"±" Connecting the Test Leads The meter sounds a warning tone when you set it to measure anything except current and you connect a test lead to +10A MAX. This reminds you not to touch the circuit with the test leads. Turning the Meter On/ Off/Testing the Display Using the Meter If the function selector is not set to OFF and nothing appears on the display, the meter might be in its auto power shut-off mode. Press any button to turn on the meter.
22-812.fm Page 13 Monday, April 8, 2002 1:32 PM Follow these steps to familiarize yourself with the meter’s operation before you use it for the first time. Rý. 1. Rotate the function selector to select one of the following functions, then repeatedly press SELECT to select the function you want. 2QUKVKQP °C/°F / V dBm / ~ V &GUETKRVKQP Displays temperature (°C or °F). Measures DC voltage. Measures AC voltage in dBm. Measures AC voltage in volts. / µA/A Measures current, DC 0.4/4 mA and AC 0.
22-812.fm Page 14 Monday, April 8, 2002 1:32 PM to display 4001 or more units) or underflow (the meter tries to display 379 or fewer units). 3. To select manual range mode, press RANGE. AUTO disappears. Then repeatedly press RANGE until the range you want appears. The decimal point shifts each time you press RANGE. 4. Hold down RANGE for about 2 seconds. The meter exits manual range mode and returns to its auto range mode. 5.
22-812.fm Page 15 Monday, April 8, 2002 1:32 PM 400 mA 4A 10 A 400 Ω 4 kΩ 40 kΩ 400 kΩ 4 MΩ 40 MΩ 4 nF 40 nF 400 nF 4 µF 40 µF &KURNC[ ZZZ$Zýc7 Z$ZZZý7 ZZ$ZZý7 ZZZ$ZýΩ Z$ZZZýaΩ ZZ$ZZýaΩ ZZZ$ZýaΩ Z$ZZZýCΩ ZZ$ZZýCΩ Z$ZZZýd< ZZ$ZZýd< ZZZ$Zýd< Z$ZZZýµ< ZZ$ZZýµ< 7. Connect the test leads to the circuit you want to measure. To measure different circuits, see “Making Measurements” on Page 18. ±ý. *1.&+0)"#"/'#574'/'06 Press HOLD to hold all indications on the display.
22-812.fm Page 16 Monday, April 8, 2002 1:32 PM ±"016'"±" Using Relative Measurement • If the value you measured in Step 2 is greater than the value you measured in Step 4, the meter shows a negative value. This is not a malfunction. • Eý< appears if you measure values outside the meter’s currently set range. If Eý< appears, immediately disconnect both probes from the circuit, then touch the probes together or choose another range.
22-812.fm Page 17 Monday, April 8, 2002 1:32 PM To turn the meter back on after it automatically turns off, press any button. 75+0)"219'4".1%- To set the meter so it does not turn off automatically, set the function selector to OFF to turn it off. Hold down HOLD and SELECT at the same time, then turn on the meter. FBeY appears until you release HOLD and SELECT. The meter sets itself to its normal test mode and does not automatically turn itself off.
22-812.fm Page 18 Monday, April 8, 2002 1:32 PM Making Measurements repeatedly press MAX/MIN to read the currently selected maximum value (if CWn appears) or the currently selected minimum value (if C_d appears). ±"016'"±" When the meter is set to its voltage or current function and the input is out of the setting’s range, Eý<ýappears on the display and CWn or C_d flashes on the left side of the display. 5. To pause monitoring, press HOLD. Hold appears. To continue monitoring, press HOLD again.
22-812.fm Page 19 Monday, April 8, 2002 1:32 PM You can use an optional thermocouple module to measure temperature with your meter. The thermocouple module you use must output 1mV per measured °C or °F. The meter can display temperatures up to 999°C or 999° F. 1. Set the function selector to °C/°F / V. 2. Unplug both test leads from the meter, plug the thermocouple’s common plug into –COM (common) on the front of the meter, then plug the thermocouple’s +V plug into + V.mA.Ω Ω. 3.
22-812.fm Page 20 Monday, April 8, 2002 1:32 PM ý Making Measurements R "9#40+0)ý R " Measuring AC Voltage Riding on a DC Source Bias To avoid injury or damage to your meter, never try to measure an AC voltage that is riding on a DC source bias where the peak AC voltage exceeds 1000 V with respect to earth ground. Measuring ThreePhase AC Voltage This voltage exceeds the meter’s rating. Therefore, you should not connect the meter to this circuit or to any equipment connected to the circuit.
22-812.fm Page 21 Monday, April 8, 2002 1:32 PM ."%#76+10". Measuring DC/AC Current (continued) 3. Remove the power from the circuit under test and discharge all capacitors. 4. Plug the black test lead into –COM and the red test lead into the appropriate jack. 5. Connect the meter’s test leads in series with the circuit. 6. Apply power and read the current value. If the measurement is less than 400mA and the red test lead is connected to +10A MAX, remove power from the circuit.
-812.fm Page 22 Monday, April 8, 2002 1:32 PM Making Measurements ±"016'"±" Measuring Resistance • • With no resistance connected across the test leads (meaning resistance is infinite), Eý< appears when you set the meter to measure resistance. This is normal. If you are measuring resistance of about 1MΩ or more, the display might take a few seconds to stabilize. This is normal. 2. Rotate the function selector to •. Ω Ω, or MΩ 3.
22-812.fm Page 23 Monday, April 8, 2002 1:32 PM /'#574+0)"%#2#%+6#0%' Capacitance measurement accuracy depends on the measurement method and differs with different types of capacitors. The meter’s measurement is for reference only. 1. Remove all power from the circuit under test and discharge all capacitors. 2. Rotate the function selector to •. 3. Set the meter to measure capacitance by pressing SELECT. nF or µF appears. Then repeatedly press RANGE if necessary to manually select the range you want. .
22-812.fm Page 24 Monday, April 8, 2002 1:32 PM Making Measurements 4. Touch the test leads across the circuit you want to measure. Shrt appears and the buzzer sounds if the circuit resistance is less than about 50 ohms (meaning the circuit is continuous or shorted). Open appears and the meter’s buzzer does not sound if the circuit resistance is greater than about 50 ohms (meaning the circuit is not continuous). ±"016'"±" (continued) its own capacitance (see “Using Relative Measurement” on Page 15).
22-812.fm Page 25 Monday, April 8, 2002 1:32 PM Many diodes have a stripe or mark on one side. The marked side of the diode indicates the diode’s cathode or negative (–) side. The other side is the anode or positive (+) side. If a diode is not marked, you can use your meter to check the diode’s polarity. As you follow the steps under “Checking Diodes” on Page 24, connect the red test lead to one side, connect the black test lead to the other side, then measure and note the voltage.
22-812.fm Page 26 Monday, April 8, 2002 1:32 PM Making Measurements Otherwise, to select the duty cycle or pulse width function, repeatedly press Hz/DUTY/ WIDTH until å appears (to select duty cycle) or until µI or cI appears (to select pulse width) 3. If you are measuring frequency, press RANGE if necessary to select manual range then repeatedly press RANGE until the range you want appears. 4.
/'#574+0)"#%"%744'06"(4'37'0%; 1. Rotate the function selector to / µA/Aýfor 0.4/4mA and 4/10A ranges or / mA/A for 40/ 400mA and 4/10A ranges. ± ±"016'"±" • If the meter is set to measure current, it cannot measure the frequency of a signal with DC bias. • Press SELECT twice to set the meter back to the AC A measurement function. 2. To select the frequency function, press Hz/ DUTY/WIDTH once. 3.
22-812.fm Page 28 Monday, April 8, 2002 1:32 PM 75+0)"6*'"/'6'4"9+6*"#" %1/276'4 You can connect your meter to a computer, letting you conveniently monitor and record and log data over a long period of time. You can even use your meter to display oscilloscope information on your computer! For example, you can record changes in temperature in a refrigerator or voltage changes in a circuit over a long period of time.
22-812.fm Page 29 Monday, April 8, 2002 1:32 PM 3. After you finish installing the software, restart your computer. 4. Connect one end of the supplied RS-232 cable to the jack on top of the meter, then connect the other end to your computer’s serial port. You must configure your meter to work with the Meter View software and the software to work with your meter. 1. Make sure the meter is connected to your computer (see “Installing the Meter’s Software/ Hardware” on Page 28). 2.
22-812.fm Page 30 Monday, April 8, 2002 1:32 PM ý R "9#40+0)ý Cleaning R " • Do not let any water drip inside the meter while cleaning it. • Make sure that the meter is completely dry before using it. Replacing the Fuses • • To avoid electric shock, you must disconnect the test leads before you remove the battery cover and back cover. Do not operate your meter until the back cover is in place and secured. ."%#76+10".
22-812.fm Page 31 Monday, April 8, 2002 1:32 PM plastic holder and insert it into the fuse holder through the loop of the attached ribbon. 6. Replace the back cover and secure it with the screws. Care and Maintenance 7. Reinstall the battery (see “Installing a Battery” on Page 11), then replace the battery cover and secure it with the screw.
22-812.fm Page 32 Monday, April 8, 2002 1:32 PM Limited Ninety-Day Warranty This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack company-owned stores and authorized RadioShack franchisees and dealers.
