LEM Saturn 100 Plus - Measuring Resistance (R), Compensation of Additional Line Resistance

Measuring
36
3.10 Measuring Resistance (R), Compensation of
Additional Line Resistance
In the measuring mode Resistance Measurement, resistances up to 20 Ohm can be
measured with battery DC voltage and automatic pole-change as per IEC61557-4.
Continuity checks can be performed fully automatically with battery DC. The built-in
buzzer responds to resistances <2 Ohm (compensation of the measuring-lead
resistances is inactive).
For compensation of the measuring-lead resistances, a function „Zero
Compensation“ is available.
Measuring Process:
L
1
= brown
L
2
= black
L
3
= purple
L3
L2
L1
Instrument
RX
R
Observe overload capacity and connect instrument as shown. Connect
instrument as per Figure with 3-pole measuring lead.
Connect measuring lead L
3
with measuring lead L
2
.
Turn central selector in mode „R“ to position „1 kΩ“.
The Voltage „U
L-N
“ between the measuring leads L
1
and L
2
+ L
3
is automatically
displayed (see also section 3.6).
Pressing key „Start“ starts the resistance measurement, the plus pole of the
voltage being first applied to L
2
and earth/ground to L
1
- with subsequent
automatic pole-change. The value displayed is the measured value minus the line
resistance of the measuring lead (if the compensation is active), labelled resistance
R
1
(corresponding to L
2
= plus pole
L
1
= earth/ground).
Pressing key
S „Display“ makes R
2
(corresponding to L
1
= plus pole, L
2
=
earth/ground) available for display.
For a new measurement press key Start“ again.
To return to the original measurement for displaying the mains voltage U
L-PE
, twist
the central selector.