APPLICATIONS
VHF-TO-BNC ADAPTER
(KEITHLEY P/N CS-115)
7
BNC TO TRIAX ADAPTER
(KEITHLEY MODEL4804)
MODEL 263
Figure 5-10. Model 610C Calibration
Accuracy Checks:
1. Voltage (step b) -Use the Model 263 to check all but
the ImV, 3mV, 30V and 1OOV ranges of the Model
61OC. A Keithley Source Measure Unit (Model 236,
237 or 238) can be connected to FXT INPUT of the
Model 263 in order to source 30V and 1OOV to the
electrometer.
2. Current (Step c) -This procedureuses two different
current sources (one custom built) to provide the re-
quired current levels. Instead, use the Model 263 to
accurately source all required current levels.
3. Ohms (step d) - The procedures in this paragraph
require precision resistors to check accuracy. In-
stead, use the Model 263 to source the appropriate
resistance. When sourcing lOOM0 or more to the
Model 61OC, use guarding. For guarded ohms, en-
able guard on the Model 263, place the feedback
switch of the Model 61OC in the FAST position, and
connect the instruments as shown in Figure 5-11.
4. Coulombs (step e) - This procedure sources 1OV
through a high-megohm resistor. A better technique
to check charge accuracy is to source the appropriate
charge level for each range using the charge source
of the Model 263. Typical rise times using this tech-
nique is a couple of seconds and not the 10 seconds
listed in Table 9 of the Model 610C manual.
5-17
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