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Appendix A: Specifications
A–22
VX4101A MultiPaq Instrument User Manual
NOTE. Percents listed above are percents of reading. Instrument set up is as
follows:
Autozero On, after 20 minute warm-up.
The above specifications are for 4-wire W. Add 50 MW to all specifications for
2-wire ohms.
Tcal is the calibration temperature (18 to 28
° C). Specifications are for Tcal
±3
° C. Multiply the total temperature coefficient by the difference between the
actual operating temperature and Tcal ±3
° C.
For the 300 MW range, the measured resistance in MW multiplied by the
temperature difference in
°C is limited to 1000, for example, at 100 MW the
temperature drift specification is only valid for a temperature difference of
10
°C.
Add 0.002% of the range setting to the first reading following a range change.
For Autozero Off, do the following:
For daily and long term drift, add 500 m
W/Day for the 30 W range, 1 mW/ Day
for the 300
W range, 100 kW/ Day for the 300 mW range, and 0.0001% of range
for the other ranges.
For temperature drift, increase the second part of the temperature coefficient by
a factor of 4, for 300 kW range or lower (increase 1.5 mW to 6 mW, 2.5 mW to
10 mW, etc.) .
Table A–53: Resistance Input Protection-All Ranges
Terminals DC and AC/RMS AC Peak
R+ to R– 250 V 250 V
R+ to chassis 350 V 450 V
R– to chassis 350 V 450 V
NOTE. For Common Mode Rejection, see DCV Specifications.
Table A–54: DC Current
Range Maximum Reading Resolution
150 mA
±150.000 mA
0.5 mA
1 A
±1.00000 A
5 mA