XS series operating manual
XS user manual v0.55 - 26 -
The measurement range is defined by the following formula:
(Utest / Umax generator) x 20 G
This gives the following board for the 500, 750, 1000 et 1500V standard voltages
Measurement accuracy
2000 digits numeric display with unity indication (K, M, G, T).
Accuracy (% of the reading, 1U = 1 digit) : ±(1% + 1U)
NORMAL mode : from 1.00MΩ to 20GΩ
Input impedance = 10kΩ ± 1%.
CAPACITANCE mode: from 1.00M to 20G with an accuracy equal to the NORMAL mode
accuracy ±100k
Input impedance = 10 M ±1%
Measurement threshold
The megohmmeter function can operate either with one or two measurement threshold(s) between
1M up to 20G.
A measurement is PASS after comparison between the displayed value and the thresholds.
When looking for a value only higher than a limit, the LOW THRESHOLD is used to set the limit and
the HIGH THRESHOLD is not used by setting a value equal to the maximum resistance (basically
20G).
When looking for an insulation resistance higher than a limit but not too much high ( which can
means that the specimen is not correctly connected), then the LOW THRESHOLD is set the
minimum insulation value expected and the HIGH THRESHOLD is set to the maximum insulation
value expected.
Setting examples:
PASS ( insulation > LOW limit )
FAIL ( insulation < LOW limit)
PASS ( insulation > LOW limit + < HIGH limit)
FAIL (insulation > HIGH limit )
* threshold not active
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