EXTECH MG325 [13/18] Disable lock mode for insulation and continuity tests

13 MG325-en-GB_v1.1 3/16

6.9.1 Disable Lock Mode for Insulation and Continuity Tests

To disable test lock mode and use manual test mode, press and hold the button until the

lock icon switches off and then press and hold the TEST button for the duration of the test (TEST

will be displayed). Release the button to stop the test.

6.9.2 Insulation Resistance Test Timer

Please read and understand the sections on Insulation Resistance testing and Safety before

continuing.

The MG325 can run an Insulation test for an indefinite period by pressing the TEST button to

start/stop tests (Timer function OFF) or it can be programmed to run a test for a specific period of

time, 1~10 minutes (Timer function ON).

1. Short press the

button to turn the test timer ON or OFF (the TIMER icon will display

when the timer is active).

2. The test time, while the Insulation Resistance test is running, is shown in the auxiliary display

in ‘seconds’ (s).

3. To set the test time, press and hold the SETUP button to enter the SETUP mode. Press

to step to the 2

menu item (test time) and use the arrow buttons to select a test time

between 1~10 minutes. Press

to confirm the setting and then press and hold the

SETUP button to exit the SETUP mode. See SETUP mode section for additional details.

4. Now when Insulation tests are run, and the

button is pressed, the tests will stop

automatically after the programmed test time has elapsed.

5. Press

to turn this function off (TIMER display prompt will switch OFF).

6.9.3 Dielectric Absorption Ratio [DAR] Insulation Testing

Read and understand all operations and safety information in the Insulation Resistance

measurement and Safety sections before continuing.

1. Connect the meter to the device under test as shown in the Insulation Resistance test section

above.

2. Select the desired output test voltage using the rotary function switch.

3. Use the PI/DAR button to step to the first DAR test mode (60 seconds : 15 seconds ratio test)

or to the second DAR test mode (60 seconds : 30 seconds ratio test).

4. The display will show the DAR icon when the DAR mode is successfully accessed.

5. The test time ratio will show on the lower right.

6. Press the TEST button to start the test.

7. During the test the auxiliary display digits show the elapsed time, the voltage alert flashes on

the upper left, and the ‘test voltage alert’ LED will light.

8. The test will stop automatically after 60 seconds.