Operation - Extech Instruments 380385 Manual

Operation

Powering the meter
Press the ON button to turn the unit on. Press the OFF button to turn the unit off.
Insulation Resistance Measurements
Warning: The circuit under test must be completely de-energized and isolated before
making test connections.
1. After turning the unit on, the display will prompt the user
to select a test voltage (diagram at right).
2. Select the test voltage by pressing one of the preset
voltage buttons (1KV, 2.5KV, 5KV, 10KV) or by pressing the Voltage Adjust buttons
(500+, 500-) to step through the available test voltages in 500V steps.
3. The resistance range for the selected voltage is indicated on the dot matrix display as
shown above.
4. Press the TEST START / STOP button again.
5. The display will prompt the user to connect the leads.
Press the TEST START/STOP button to start testing.
6. The elapsed test time appears on the upper line (right
hand side) of the display. The resistance reading is shown on the upper left hand side
of the display. The lower line shows the test voltage in bargraph format (see diagram
at right).
7. The HOLD icon will appear in place of the bargraph
when the test is complete and the voltage has been
discharged.
WARNING: DO NOT REMOVE THE TEST LEADS BEFORE THE HOLD DISPLAY
APPEARS.
8. The meter automatically discharges the system at the end of the test.
9. The meter automatically powers down after 5 minutes.
TM
The Enersave Mode
TM
Enersave mode conserves battery life by performing a relatively short test (10 seconds).
TM
The Enersave
(100 seconds max), press and hold the TEST button for 3 seconds when starting a test.
Bargraph Voltage Display
The bargraph represents the voltage present on the test leads as it rises, soaks, and
decays. The bargraph appears on the lower left of the dot matrix display during a test.
Automatic Under/Over Range Resistance Detect
If the display shows the message "LOW MΩ", the test should be interrupted immediately
by pressing the TEST button. This message indicates that the insulation under test has
broken down and the meter is trying to inject a high potential onto a short circuit. If 'HIGH'
appears, it is likely that the test configuration is open. Check the test set-up then test
again.
Elapsed Timer
The test duration is indicated on the display. This is particularly useful in determining
whether an insulating material under test will break down in a given amount of time.
mode is the default test mode. To bypass this mode and run a longer test
5
Select Voltage:
250000MΩ V = 5000V
Connect Leads . . . .
. . . . . . Press TEST
R=9.998MΩ
0> █ █ █ █ █ █ <500V
380385 V1.5 3/04
6.8s