Charge Standard Operation; Charge Connections - Keithley 5156 Instruction Manual

Typical calibrator voltages
Table 2-2 summarizes typical calibrator voltages, resistance standards used, and
the resulting currents. Currents are based on nominal resistance values.
Table 2-2
Typical calihmror voltqes for current
standard
operation
Nominal Calibrator Standnrd
current voltage resistance
2pA
0.2v lOOGR
2OpA 2v
1OOGR
2OOpA 2v IOGQ
2nA 2v IGQ
20nA
2ov
1GQ
2OOnA
2OV
IOOMR
7~4
2oov
IOOMQ
Charge standard operation
Charge connections
Figure 2-6 shows connections for operation as a charge standard. When making
connections, be sure to:
- Connect the Model 5156 OUTPUT jack to the INPUT jack of the instru-
ment being tested using a suitable triax cable.
WARNING
To assure proper grounding, connect the Model 5156 OUT-
PUT jack to the instrument INPUT jack before applying
voltages to the standard.
- Connect the charge filter OUTPUT jack to the BNC jack of the capacitance
standard being used.
- Connect the charge filter INPUT jack to the DC voltage calibrator using a
BNC cable and adapter.
* Be sure that the Model 5156 SHIELD and CHASSIS jacks on the front
panel are connected together.
CAUTION
Do not apply more thnn 2OOV peak to the charge filter or
the Model 5156.
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