APPLICATIONS
MODEL 263
INPUT
4
MODEL 602
(GUARD ENABLED)
(NORMAL FEEDBACK)
Figure 5-12. Model 602 Accuracy Checks
OHMS GUARD
MODEL 263
MODEL 602
(GUARD ENABLED)
Figure 5-13. Model 602 Ohms Accuracy Checks (z1GQ)
5.4.7 Model 616 Electrometer Calibration
Connect the OUTPUT of the Model 263 to the INPUT of
the Model 616 using the supplied triax cable. The Model
616 should be in NORMAL for all calibration adjustments.
Referring to the calibration procedure found in the Model
616 Instruction Manual, use the Model 263 as follows:
1. Voltage Calibration (steps e 3-38)-These steps consist
of applying voltages (5mV to 1OOV) to the electromter
and adjusting the appropriate pots. The VOLTS source
of the Model 263 will provide all but the 1OOV. To source
loOV, connect a DC Calibrator (such as the Fluke Model
343A) to EXT INPUT of the Model 263. With the DC
calibrator set to output lOOV, pressing SHIFT VOLTS
on the Model 263 will deliver the 1OOV to the electro-
meter.
2. Resistance Calibration (step +-Use the Model 263
OHMS source to output lOOk to the electranter and
make the appropriate adjustment.
5.5 SOURCING APPLICATIONS
The following paragraphs provide several applications us-
ing the Model 263 as a precision source.
5.5.1 Current Suppression
The Model 263 can be used to suppress steady background
currents so that a picoammeter or electrometer can
measure small variances in signal. For example, the Model
5-19
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