Keithley 263 User Manual

MAINTENANCE
BNC -TO DOUBLE BANANA
ADAPTER (POMONA MODEL 1269)
7
MODEL 263
MODEL 196 DMM
TRIAX -TO BNC
ADAPTER
(KEITHLEY MODEL4804)
Figure 8-3. Volts and Low Ohms Calibration
B. Low Ohms (lkfl through lMn) Calibration
1. While in standby, set the Model 263 to the lkQ range
and the DMM to the 3kfI range.
2. On the Model 263 press ZERO and then OPERATE to
source zero ohms to the DMM.
3. The offset reading on the DMM will be the result of
cable resistance and zero offset. To zero the display,
thus cancelling the offset, press the ZERO button on
the DMM.
NOTE
If using a DMM that does not have a zero suppress
feature, record the offset reading. This value will
have to be algebraically subtracted from the
reading in the next step to determine the actual
resistance sourced by the Model 263.
4. Press ZERO of the Model 263 to source the resistor to
the DMM. The reading on the DMM is the resistance
sauced by the Model 263.
5. Record the resistance output value in Table 8-4 (“cold’
al) or Table 8-7 (“hot” cal). This 5% digit reading is the
calibration value.
6. Select the Model 263 calibration program by pressing
the MENU button.
7. Using the Adjust method, enter the calibration value
on the display of the Model 263 and then press the
MENU button to calibrate and store the new value.
8. Place Model 263 in standby and disable the zero feature
on the DMM.
9. Using the appropriate low ohms calibration table as a
guide, repeat steps 2 through 8 for the 1OkQ range.
10. Using the appropriate low ohms calibration table as a
guide, repeat steps 4 through 7 for the 1OOkO and lMQ
ranges.
NOTE
If using the direct measurement method to
calibrate high ohms, skip the following procedure
(C). Instead, perform the following steps using
Table 8-9 and 8-10 as a guide. Note that guarding
should be used to measure the lOOMa through
1OOGn resistors. Remember, Model 263 guard is
toggled on and off by pressing SHIFT GUARD in
that order. The GUARD indicator light on the front
panel defines its status.
1. While in standby, set the Model 263 to the
1OMQ range.
2. On the Model 263, press OFEWE to source
lOM0 to the measurement instrument.
3. Record the actual resistance output value in
Table 8-9 (“cold” al) or Table 8-10 (“hot” al).
This reading is the calibration value.
4. Select the Model 263 calibration program by
pressing the MENU button.
5. Using the Adjust Method, enter the calibration
value on the display of the Model 263.
6. Press the Model 263’s MENU button to
calibrate and store the value.
7. Set the Model 263 to output lOOMQ, and per-
form steps 3 through 6 to calibrate the lOOMa
range.
8-5

Keithley 263 Specifications

General

Brand	Keithley
Model	263
Category	Test Equipment
Language	English