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TO
5156
BNC
Jack
TO
Calibrator
Figure 2-3
Chargefilter
charge measurements and should not bc connected when the Model 5 156 is being
used as a current, rcsistancc, or capacitance standard.
Figure 2-4 shows a schematic of the charge filter, which is a simple RC network
that forms a. single-pole, low-pass filter.
Figure 2-4
Charpjilter
.schematic
Test considerations
* Use the Model 5 I56 at an ambient temperate of 23" +3"C.
- Do not touch triax or BNC jack insulators. If the insulators become contami-
nated, they should he carefully clenncd as covcrcd in Section 3.
* Keep caps on connecting jacks when not in USC.
* Use only quality connecting cables, and keep cables as short as possible.
- Do not flex or vibrate cables while making measurements.
- Perform all tests at a stable ambient temperature and humidity recommended
by equipment manufacturers.
Recommended voltage calibrators
A DC voltage calibrator is required when using the Model 5156 as a current or
charge standard. Table 2-1 summarizes recommended calibrators.
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