TB 9-6625-2348-35
(12) Set calibrator output to minimum and disconnect equipment setup.
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) Connect calibrator to TI V Ω
and COM inputs.
.
(2) Set TI function switch to V
(3) Set calibrator for an output of 390 mV at a frequency of 60 Hz. If TI does not
indicate within limits specified in first row of table 8, perform b below.
(4) Repeat technique of (3) above for settings and indications listed in table 8. If TI
does not indicate within limits specified in table 8, perform b below.
Calibrator output
Test instrument
Amplitude
Frequency
Indications
Model 87
Model 87 III
Min
Max
Min
Max
390
mV
60
Hz
386.8 mV
393.2 mV
386.8 mV
393.2 mV
390
mV
1
kHz
385.7 mV
394.3 mV
385.7 mV
394.3 mV
390
mV
5
kHz
381.8 mV
398.2 mV
381.8 mV
398.2 mV
390
mV
20
kHz
381.8 mV
398.2 mV
380.2 mV
399.8 mV
3.900 V
60
Hz
3.870 V
3.930 V
3.870 V
3.930 V
3.900 V
1
kHz
3.857 V
3.943 V
3.857 V
3.943 V
3.900 V
5
kHz
3.818 V
3.982 V
3.818 V
3.982 V
3.900 V
20
kHz
3.818 V
3.982 V
3.802 V
3.998 V
39.00 V
60
Hz
38.70 V
39.30 V
38.70 V
39.30 V
39.00 V
1
kHz
38.57 V
39.43 V
38.57 V
39.43 V
39.00 V
5
kHz
38.18 V
39.82 V
38.18 V
39.82 V
39.00 V
20
kHz
38.18 V
39.82 V
38.02 V
39.98 V
390.0 V
60
Hz
387.0 V
393.0 V
387.0 V
393.0 V
390.0 V
1
kHz
385.7 V
394.3 V
385.7 V
394.3 V
390.0 V
5
kHz
381.8 V
398.2 V
381.8 V
398.2 V
1000
V
60
Hz
991
V
1009
V
991
V
1009
V
1000
V
1
kHz
986
V
1014
V
986
V
1014
V
(5) Set calibrator output to minimum and disconnect equipment setup.
b. Adjustments
(1) Set calibrator for an output of 3.513 V at a frequency of 50 Hz.
(2) Adjust R34 (fig. 1) until TI indicates 3.500 V ac (R).
NOTE
The disparity between an input of 3.513 and an indication of
3.500 is due to compensation for the RMS converter linearity.
(3) Change calibrator output amplitude to 100.0 V at a frequency of 20 k Hz.
(4) Adjust C37 (fig. 1) until TI indicates 100.0 V ac (R).
(5) Change calibrator output amplitude to 3.500 V at a frequency of 10 kHz.