TB 9-6625-1965-35
(12) Set calibrator for an initial 17 mA output and, if necessary, rotate calibrator
knob below EDIT FIELD pushbutton to adjust calibrator for a TI indication of 17 mA.
(13) Set calibrator to STANDBY and set mASEC mA switch to mASEC.
(14) Momentarily set calibrator to OPERATE. If digital multimeter does not
indicate between -13 and -17 V dc, adjust R7 +COMP (fig. 2) until digital multimeter does
indicate between -13 and -17 V dc.
(15) Set calibrator to STANDBY, reverse leads on calibrator and repeat (5) through
(14) above. If digital multimeter does not indicate less than 1 V dc when -22 mA is
applied and between -13 and -17 V dc when -17 mA is applied to TI, adjust R6 -COMP
(16) Repeat a above. If TI is out of tolerance at a (15) above, adjust R17 CAL (fig. 2)
while toggling calibrator between OPERATE and STANDBY until TI indicates the same
reading in mA as frequency counter indicates in time, 2 digits (R).
a. Performance Check
(1) Connect TI V-Ω input to calibrator OUTPUT HI and TI COMMON input to
calibrator OUTPUT LO.
(2) Press TI FUNCTION KΩ and RANGE 200 Ω pushbuttons.
(3) Set calibrator for a 190 Ω nominal output.
(4) Rotate calibrator knob below EDIT FIELD pushbutton to adjust calibrator
display indication to equal TI indication. If calibrator err display does not indicate within
limits specified in first row of table 7, perform b below.
(5) Repeat technique of (2) through (4) above, using calibrator outputs and TI
indications listed in table 7. If calibrator err display does not indicate within limits
specified in table 7, perform b below.
Table 7. Resistance
Test instrument
Calibrator
err
RANGE
display indication
pushbutton settings
(%)
Nominal output
.303
200 Ω
Ω
190.0
.303
2 kΩ
1.900 k Ω
.303
20 k Ω
19.00 k Ω
.303
200 kΩ
kΩ
190
.303
2000 k Ω
kΩ
1900
b. Adjustments.
(1) Set calibrator for 190 kΩ. Adjust R12 KOHM (fig. 1) until TI indicates actual
resistance of calibrator (R).
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