TB 9-6625-2088-24
(8) DC OFFSET control to OFF (detent).
(9) FUNCTION switch to (square).
(10) ATTENUATION switch to 20/0 and VERNIER control fully ccw.
b. Connect TI to 115V ac source.
c. Set POWER switch to ON and allow at least 30 minutes for equipment to warm-up.
8. VCG Linearity
a. Performance Check
(1) Connect negative terminal of calibrator to positive side of VCG IN and positive
terminal to negative side.
(2) Connect frequency counter to FUNCTION OUT.
(3) Adjust frequency counter for a 100 ms gate time and display.
(4) Adjust calibrator DC output until frequency counter indicates 10.000 kHz.
Record calibrator output as E1.
(5) Adjust calibrator DC output until frequency counter indicates 1.000 kHz.
Record calibrator output as E2.
(6) Subtract E1 from E2 and divide by nine. Record result as E3.
Example:
E2 = - .9159
E1 = - .0359
-0.88 = Difference
-0.88
9 = - 0.0977
E3 = - 0.0977
(7) Adjust calibrator DC output voltage to calculated values listed in table 3.
Frequency counter will indicate within limits specified.
Table 3. Linearity Check
Frequency counter indications (kHz)
Calibrator DC output voltage
Min
Max
El + E3 =
8.982
9.018
El + (2 x E3 ) =
7.984
8.016
El + (3 x E3 ) =
6.986
7.014
El + (4 x E3 ) =
5.988
6.012
E1 + (5 x E3 ) =
4.990
5.010
El + (6 x E3 ) =
3.992
4.008
E1 + (7 x E3 ) =
2.994
3.006
E1 + (8 x E3 ) =
1.996
2.004
b. Adjustments. No adjustments can be made.
