Basis measurements
36
Testboy
®
TV 431
Insulation test
Warning: To avoid damaging the test voltage, do not adjust the rotary switch when outputting the test voltage.
Insulation tests may only be performed on circuits free of voltage. Check the test leads before performing the in-
sulation test.
Move the rotary switch to INSULATION. If the display shows
, replace the batteries.
Connect the test leads to the connections High and Low. If the display shows ‘Live’ this means that a measure-
ment cannot be performed, as the circuit is live. Switch the circuit voltage-free.
Select the output voltage with the TEST.V button.
The
symbol will flash during the insulation test. The main display will show the resistance value and the
auxiliary display will show the output voltage. Release the Test button. The discharge procedure is performed via
the test instrument; the display will show DISC
The auxiliary display indicates when the discharge procedure has been completed (0 VDC).
Disconnect the test leads from the circuit.
Replacing the battery
To avoid incorrect measuring results, which could lead to an electric shock or injury, replace the battery immediately
when the display shows
.
Turn the rotary switch to OFF and disconnect the test leads from the connections.
Unscrew and remove the cover of the battery compartment.
Replace the batteries whilst complying with the polarity.
Replace the cover of the battery compartment and screw down.
