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| MODEL 120 TRUE RMS MULTIMETER |
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Operating conditions: |
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ξ Operating Temperature and Humidity: | 0°C - 40°C (32°F - 104°F) | |
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| Below 80% RH |
ξ Storage Temperature and Humidity: | ||
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| Below 70% RH |
ξ Installation category III |
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ξ Pollution Degree 2 |
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ξ Indoor use only |
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ξ Altitude up to 2000 meters (6500 feet)
Accessories: Test Leads, Battery, Holster, Instruction Manual
Options: Temperature Converter, Type K Wire Temperature Probe, RS232 Cable, Software
3.0Symbol Definitions and Button Locations:
1) | LCD Display | 10) | Function Select Dial |
2) | Hold Button | 11) | ‘µA/mA’ Terminal |
3) | MAX/MIN Button | 12) | ‘Amp’ Terminal |
4) | Range Button | 13) | ‘COM’ Terminal |
5) | Backlight Button | 14) | ‘Volts, Ohms, Frequency, RPM, Capacitance, |
6) | Peak Hold Button |
| Temperature, Diode Test Terminal’ |
7) | Relative Button | 15) | RS232 Interface Connector |
8) | Voltage/Current/Frequency Button | 16) | Holster |
9) | Second Function Button | 17) | Tilt Stand |
MODEL 120 TRUE RMS MULTIMETER
5.7Frequency and RPM Measurements
1.Connect the red test lead to the ‘Hz’ jack and the black test lead to the ‘COM’ jack.
2.Set the Function Selector switch to the Hz RPM function. For RPM measurements, press the blue button to select the RPM function.
3.Connect the test leads in parallel with the circuit being measured.
4.Read the Frequency or RPM on the instrument display.
5.8Temperature Measurements
1.Plug the optional temperature converter module into the ‘TEMP’ and ‘COM’ jacks, taking care to observe the proper polarities. Plug a Type K thermocouple into the converter, again ensuring proper polarity.
2.Set the Function Selector switch to the °C °F function.
3.Press the blue button, if necessary, to select °C or °F.
4.Locate the thermocouple probe in the environment to be measured and allow sufficient time for the probe temperature to stabilize.
5.Read the Temperature on the instrument display.
5.9Capacitance Measurements
WARNING
To avoid damage to the instrument, disconnect circuit power and discharge all capacitors before measuring capacitance. Use the DC voltage function to confirm that all capacitors are fully discharged.
1.Connect the red test lead to the ‘
’ jack and the black test lead to the ‘COM’ jack.
2.Set the Function Selector switch to the 
function.
3.Ensure there is no power applied to the circuit, and then connect the test leads to the leads of the capacitor being tested, observing proper polarity on polarized capacitors.
4.Read the Capacitance on the instrument display.
Notes: 1. The bar graph is disabled in the Capacitance measuring mode. However, in the 4mF and 40mF ranges, the bargraph indicates the time required to accomplish this measurement.
2.To obtain an accurate reading, the capacitor under test must be fully discharged. This instrument will automatically discharge the capacitor, if necessary, but requires considerable time to do so. Because of this time factor, it is preferable to discharge the capacitor by external means. If the instrument is discharging a capacitor prior to measurement, disc will appear on the display.
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