Eaton Sefelec MXS1000 - Ground continuity measurement; Precautions to be observed

XS series operating manual
XS user manual v0.55 - 23 -
CAPACITANCE mode : from 1.00M to 200G (or 2 T for option 20) 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
50k up to 200G (2T with option 20 ).
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
200G).
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:
LOW
THRESHOLD
MEASURED
value
HIGH
THRESHOLD
Result
10 M
15.4 M
200 G*
PASS ( insulation > LOW limit )
10 M
9.0 M
100 M
FAIL ( insulation < LOW limit)
55 M
63.2 M
80 M
PASS ( insulation > LOW limit + < HIGH limit)
45 M
110 G
75 M
FAIL (insulation > HIGH limit )
* threshold not active
Timer
The measurement voltage can stay permanently ( timer value set to 0 sec.) or during a time
between 1 and 999 sec. adjustable by 1 sec. step.
Rise and fall times are adjustable in time ( second ) or in voltage increase ( dv/dt) from
0.1 to 0.9 sec. and from 1 to 999 sec. or in V/s from 1V/s to 500V/s.