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Insulation Tester
Measurements
11
Select a Ramp or Steady-State Test
The ramp-test function is an automated test that checks insulation for
a breakdown. During a ramp test, the output voltage starts at 0 V and
increases linearly (100 V/s) until it reaches the specified test voltage or
until a sudden drop in measured resistance is detected. Then, the
Ramp stops, the test voltage drops to zero, and the voltage at the
breakdown point is stored in memory on the Tester. All other test
results are declared invalid if the test does not reach the specified test
voltage.
If the test successfully meets compliance without breakdown, then the
only valid test results are test voltage and insulation resistance.
To enable or disable the ramp function:
1.
With the Tester turned on, push to enter the 1.X Function
Menu.
2.
Push to call the menu item.
3.
Push U or to toggle the Ramp on or off. When the ramp is
on, a blinking
shows in the upper left-hand corner of the
display.
4.
Push or to use the settings. starts the test.
Set a Timed Test
You can control the length of an insulation test by setting a timer. The
time (test duration) can be set in 1-minute increments up to
99 minutes. During a timed test, the time limit appears on the right
bottom of the display, and the elapsed time is shown in the middle of
the display. At the end of the elapsed time, the insulation test has been
completed and the test is terminated.
To set a test time limit:
1.
With the Tester turned on, push to enter the Function Menu.
2.
Push or to select the 2.Time Limit function.
3.
Push to call the menu item.
4.
Push or to select the time.
5.
Push or to use the settings. starts the test.
Polarization Index (PI)
As part of the insulation test, the Tester measures and stores
polarization index (PI), when appropriate. A polarization index test
requires 10 minutes to complete. Therefore, the Tester will start a
countdown at 10 minutes. When an insulation test is 10 minutes or
more, the polarization test is completed and stored. The results are
available for display during a test by pushing the
button or by
storing the test results and scanning the RESULTS fields. The field is
identified by:
Ramp
Indicator
Ramp
Indicator
PI =
R
@
10 min
R
@
1 min
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