Preliminary Checks - Extech Instruments 380580 User Manual

Preliminary Checks

Current Regulation Check
1. Connect the current leads C
2. Set the function switch to the 200.0mΩ range.
3. Momentarily press the
will intermittently beep and R
4. Short the current leads C
5. The R LED should go off, indicating that the meter
C
is operating correctly.
6. Momentarily press the
7. The meter will return to NO TEST status.
Voltage Measurement check
1. With the current test leads C
connect and short the potential (voltage) leads P
and P .
2
2. Set the Function switch to the 200.0mΩ position.
The NO TEST status LED will light.
3. Momentarily press the
will intermittently beep)
4. The display should indicate 00.0
5. Momentarily press the
The NO TEST status LED will light.
6. Remove the shorts from P
C and
2
7. Short the test leads P
8. The R LED as well as the NO TEST status LED
P
should light indicating an over-voltage or over-range
9. Turn the rotary selector switch to OFF
Polarity check
1. Short the test leads P
2. Set the Function switch to the 200.0mΩ position.
3. The "-1" negative indicator should appear in the
display.
Operation check
Use the Kelvin clips for this test
1. Short the all the leads (P
The P , P
1
2. Set the Function switch to the 200.0mΩ
position. The NO TEST status LED will light.
3. Momentarily press the
meter will intermittently beep
4. The display should indicate near 00.0
(depending on the test clip connections) and
both R and R
P
5. Momentarily press the
the test.
Note: These tests can be performed on any range.
1
TEST R
C
to C
1
TEST R
1
TEST R
TEST R
and P
1
to C and P
1 1
to C and P
1 2
, P
1 2
,C ,C order is important.
2 2 1
TEST R
LEDs should remain off.
C
TEST R
and C to the meter.
2
button. The meter
P
will light
2.
button to stop the test
P
and C shorted,
2
1
button. (the meter
P
button to stop the test.
P
, and C and
2 1
to C
2 2
to C together.
2 1
,C ,C ) together.
2 1
button. (the
P
button to stop
P
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