KYORITSU 3007A User Manual

Page 18

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Terminal connection of insulation resistance test

In case of testing insulation of insulated wire and cable against the earth

at direct current, connecting - pole of power to cable conductor, + to the

earth obtains smaller measuring value, compared with connecting the

other way round. This connecting method is generally acknowledged

relevant to detect defective insulation.

6-3 Continuity Measurement (Resistance Tests)

DANGER

●

Always test the circuit or equipment to ensure it is surely de-energized

before measurement according to the instruction of 6-1.

●

To avoid electrical shock, measurements must be performed on de-

energized circuits only.

●

Never make measurement with the battery compartment cover

removed.

CAUTION

●

Never press the test button if the live circuit warning is indicated or the

warning buzzer sounds. This may damage the circuit.

●

When an additional circuit is connected in parallel with the circuit under

test , inaccurate reading may be taken.

①

Set the function switch to the "AUTO NULL" position.

②

Short the test probes (red) and (black) and press the test button. Then the

resistance of the test probes is displayed and memorized with

microprocessor.

③

Set the function switch to "

Ω

" position.

④

Connect the test probes to the circuit under test and press the test button.

⑤

Read the resistance value from the LCD.

●

NULL symbol (

) is displayed while AUTO NULL function is working.

●

AUTO NULL will be cancelled when the instrument is powered off.

●

Principle of Continuity Measurement (Resistance Test)

Resistance value can be obtained by applying a certain current to the

resistance under test and measuring the voltage generated on the both

sides of the resistor under test.

Resistance value = Voltage / Current

RX = V / I

6-4 Continuous Measurement

A lock down feature is incorporated on the test button. Pressing and

turning it clockwise, lock the test button in the continuous operating

position.

To release the lock, turn the test button counterclockwise.

NOTE:

Model 3007A has TRAC/LOK function. When "LOK" mode is selected,

sampling is conducted only once, even though the test button is locked

down for continuous measurement.

To make continuous measurement, select "TRAC" mode.

DANGER

Be extremely careful not to get electric shock during insulation resistance

measurement as high voltage is present on the tip of test probes

continuously.

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3007A-E 01.9.12 11:52 AM ページ 16

This manual is related to the following products:

3005A