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Figure 3. Resistance - equipment setup.
Figure 4. Dissipation - equipment setup.

Calibration Procedure For Capacitance, Inductance, And Resistance Test Set An/Urm-90 (Zm-30/U) And Universal Impedance Bridge Page Navigation
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TB 9-6625-1014-24
(9) Set RANGE switch to RX100Ω and FUNCTION switch to RX 10.
(10) Adjust resistance standard for 10 kΩ.
(11) Adjust TI LRC dials until dc detector indicates null.
(12) TI dials will indicate within .1 percent plus one dial division of certified value
recorded in (1) above.
b. Adjustments. No adjustments can be made.
19. Oscillator
a. Performance Check
(1) Adjust TI DET GAIN control cw from PWR OFF position and GEN DET
switch AC DET INT 1 KHz.
(2) Connect frequency counter to TI R-L1 (high) terminal and EXT BIAS 1 (low)
terminal. Frequency counter will indicate between 990 and 1010 Hz.
b. Adjustments. No adjustments can be made.
20. Capacitance
a. Performance Check
(1) Position TI controls as listed in (a) through (c) below:
(a) FUNCTION switch to CDx0.01 SERIES.
(b) D-Q SERIES dial to 0.
(c) RANGE switch to Cx0.01 F.
(2) Insert capacitance standard into 2C and 3C terminals.
(3) Adjust TI LRC dial, D-Q SERIES dial, and DET GAIN control to obtain best
null indication on TI meter.
(4) If LRC dials do not indicate within 0.2 percent plus (+) one dial division of
certified value of standard capacitor, perform b below.
b. Adjustments
(1) Remove TI from case.
(2) Set RANGE switch to 0.1 F.
(3) Set TI LRC dials to 1.000.
(4) Adjust D-Q dials and trim capacitor C1 (attached to capacitance standard
located above the transformer) alternately until null is obtained on meter (R).
(5) Install TI in its case.
21. Dissipation
a. Performance Check
(1) Connect equipment as shown in figure 4.
(2) Adjust resistance standard to 31.85 Ω.
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