TB 9-4920-451-24
e. Set switches as listed in (1) through (3) below:
(1) FUNCTION SELECTOR to CAP IND-ZERO CAL.
(2) CAP RES CHECK to CAP.
(3) CAPACITANCE INDICATOR-RANGE SELECTOR to X1.
f. Set CAPACITANCE INDICATOR ZERO ADJUST control for a zero indication on
meter.
g. Set CAPACITANCE INDICATOR-RANGE SELECTOR switch back and forth
through its four ranges. If meter does not indicate zero, adjust R120 (fig. 3) for minimum
shift of pointer.
h. Repeat e above for RANGE SELECTOR switch settings X10 and X50. If meter
does not indicate zero on all ranges, repeat e and f above for optimum zero.
Figure 3. Consolidated Airborne Systems, Models TF20-1 and TF579 - adjustment locations.
i. Set CAPACITANCE INDICATOR-RANGE SELECTOR switch to appropriate
range for value stamped on front of TI, and set function switch to CAP-IND-HIGH CAL. If
capacitance meter does not indicate value stamped on front panel, adjust HIGH ADJUST
control.
j. Adjust autotransformer between 105 and 125 V. Capacitance meter will indicate
within 5 percent of reading stamped on front panel.
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