Ratio Accuracy

TB 9-1430-201-50

16. Ratio Accuracy

a. Performance Check

(1) Connect equipment as shown in figure 2.

(2) Position TI dials to 999(10).

(3) Adjust voltage divider (A3) to 999999X.

(4) Adjust output of voltage standard (A4) to 12 volts.

(5) Adjust lead compensator (A5) BALANCE 1 control for null on null detector (A1).

(6) Set TI and voltage divider controls to zero.

(7) Adjust lead compensator BALANCE 2 control for null on null detector.

(8) Repeat (2) through (7) above until no further adjustment is required.

(9) Set TI dials to 9000.

(10) Adjust voltage divider dials to obtain null on null detector. Voltage divider will

indicate between 899950 and 900050.

(11) Repeat technique of (9) and (10) above at TI dial settings listed in table 8.

Voltage divider will indicate within limits specified.

Table 8. Ratio Accuracy

Test instrument

Voltage divider indication

dial indication

Min

Max

899(10)

899950

900050

8888

888750

888850

7777

777650

777750

6666

666550

666650

5555

555450

555550

4444

444350

444450

3333

333250

333350

2222

222150

222250

1111

111050

111150

b. Adjustments. No adjustments can be made.