Tenma 72-9400A - Voltage Measurement; Insulation Resistance Measurement; Tester’s Structure; Functions of Keys and Knobs

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4. Tester’s Structure
1. EARTH: Insulation resistance input jack
2. G: Negative voltage input jack
3. V: Positive voltage input jack
4. LINE: Insulation resistance input jack ( high voltage output)
5. LCD screen
6. Backlight Button
7. Data-hold Button
8. Insulation resistance test button
9. Functional Knob
5. Functions of Keys and Knobs
1. HOLD: data hold;
2. LIGHT: tum on or of the backlight source;
3. TEST: tum on or o󰀨 high voltage test;
4. Test AC voltage when function knob points to ACV:
5. Test DC voltage when function knob points to DCV;
6. Test insulation resistance when the function knob points to 100V/250V/500V/1000V
(select the desired output voltage).
6. Voltage Measurement
To measure AC voltage, do the following:
(1) Insert the red test lead into the • V • input port and the black test lead into the “G” Input port.
(2) Place the function knob in the ICV function position to test AC voltage.
Caution
• Do not input AC voltage over 750Vrms. It is possible to display a higher voltage but it may cause damage to the instrument
or electric shock.
• After all the testing operations, disconnect the test leads and the circuit under test, and remove the test leads from the
instrument input jack.
• In case the battery cover is opened, do not conduct any test.
7. Insulation Resistance Measurement
Caution
a. When measuring insulation resistance, please strictly place the two test probes separately. Do not mix them up.
b. Neither short circuit the two test probes under high voltage output state nor measure insulation resistance after high
voltage outputs.
c. In case the battery cover is opened, do not conduct any test.