5.6.7
Resistance Calibration
Range
200
n
2
kQ
20
kfl
200
kQ
2MQ
20MQ
With the Model
197
in the calibration mode
("C"
annun-
ciator on), select the ohms function and connect the calibra-
tor to the Model
197
as shown in Figure 5-5. Four wire re-
sistance measurements need only be done when not using
the REL feature. Use the following procedure and refer to
Table 5-4 to calibrate the ohms function.
Calibration
Resistance
190
Q
1.9
kQ
19
kQ
190
kfl
1.9 MQ
19
M
1.
Select the
2OOQ
range and set the resistance calibrator
to
output zero ohms (short).
2.
Press the
REL
button on the Model 197. The
REL
annun-
ciator appears on the display and the display reads zero
(test lead compensation).
3.
Set the calibrator to output 190Q. Adjust the display using
the STO/CLR and RCL buttons
for
a reading
of
190.000Q.
Press
REL
(REL
annunciator turns
off).
4.
Select the 2kQ range and set the resistance calibrator to
output zero ohms (short). Press REL
(REL
annunciator
turns on).
5.
Set the calibrator to output 1.9kQ. Adjust the display
for
a
reading
of
1.90000kn.
6.
Press the
REL
button and note that the
REL
annunciator
turns
off.
7.
Select the 20kQ range and set the resistance calibrator out-
put zero ohms (short). Press
REL
(REL annunciator turns
on).
8.
Set the calibrator
to
output 19kQ. Adjust the display
for
a
reading
of
19.0000kQ. Press REL (REL annunciator turns
off).
9.
Repeat steps
7
and
8
for the
200k, 2M
and
20M
ranges
using Table 5-4 as a guide. For these ranges use the con-
figuration shown in Figure 5-6.
-
INPUT
HI
RSENSE
f
INPUT
MODEL 5450A
INPUT
LO
SENSE
LO
MODEL
197
Figure
5-5.
200, 2k
and
20k
Four Wire Resistance
Calibration
NOTE
Four terminal resistance measurements need on-
ly be done when not using the
REL
feature.
5.6.8
Calibration
Storage
MODEL 5450A
MODEL
197
Figure
5-6,
200k, 2M
and
20M
Two
Wire Resistance
Cali brat ion
Table
5-4.
Resistance
Calibration
Model
197
Reading
190.000
Q
1.90000
kR
19.0000
kQ
190.000
kQ
1.90000
kQ
19.0000MQ
5-7
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