Calibration of Resistance Ranges
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6-8
6.9 Calibration of Resistance Ranges
Offset Correction
When zeroing two-wire resistance measurement, the V
Ω
-Hi and V
Ω
-Lo connectors
should be short-circuited, by connecting a short-circuit terminator to these front input
connectors, instead of the resistance to be measured.
In four-wire resistance measurement, the real offset value is determined, by using two
short-circuit terminators (Accessory No. 3016) to short-circuit the V
Ω
-Hi and V
Ω
-Lo
connectors first, and then the two Sense connectors. The Sense and Source connectors
are then connected to each other with a third short-circuit terminator, to accomplish a
four-wire short.
It is important to make certain, that the “shortest” short-circuit is created at the Sense
connectors, to prevent contact resistance or pass-through resistance from being
measured.
Notice
:
If calibration is done with a calibrator, perform a calibration offset cor
rection as discribed above with DC voltage.
Important
: After calibration is completed, the 5017 zero-point must be readjusted
again, with short-circuits, as described above.
Calibration of Resistance
Resistance ranges should be calibrated through four-wire resistance measurement. The
same calibration factors are then used for two-wire resistance measurements.
Only the higher resistance ranges need to be calibrated separately in 2-wire
measurement.
In addition , all of the two-wire resistance ranges can also be calibrated separately.
The zero offset correction must be performed with the
ZERO
key. In addition, chapter
7, ‘Operating Instructions’ should be considered, especially referring to compensation
for measurement cable resistance.
