TB 9-6625-1098-35
11. Low
Pass Filter
(Hewlett-Packard, Models 334A Option
002)
a. Performance Check
(1) Connect calibrator OUTPUT to TI INPUT.
(2) Position TI switches as listed in (a) through (c) below:
(a) METER RANGE to .3 VOLTS.
(b) FUNCTION to SET LEVEL.
(c) LOW PASS FILTER to IN.
(3) Adjust calibrator frequency to 20 kHz and amplitude for a 0.3 V indication on TI
meter. Set the reference level on calibrator by pressing the NEW REF key.
(4) Adjust TI SENSITIVITY controls for a TI meter indication of 0 dB.
(5) While maintaining 0.0% calibrator error display reading, adjust calibrator
frequency until TI meter indicates -3 dB.
(6) Verify calibrator frequency is between 27 and 33 kHz.
(7) Adjust calibrator frequency to 60 kHz and amplitude for 0.0% calibrator error
display reading. Adjust METER RANGE switch for an on-scale indication. TI meter
indication will be less than -20 dB.
b. Adjustments. No adjustments can be made.
12. Voltmeter
Residual Noise
a. Performance Check
(1) Connect shorting bar between chassis ground and circuit ground on INPUT
terminals.
(2) Connect voltage divider to TI INPUT terminals.
(3) Position TI switches as listed in (a) through (c) below:
(b) METER RANGE to .0003 VOLTS.
(c) HIGH PASS FILTER to OUT.
(4) TI meter will indicate 25 V or less.
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) Connect calibrator OUTPUT to TI INPUT.
(2) Position TI controls as listed in (a) through (c) below:
(a) METER RANGE switch to .01 VOLTS.
(b) SENSITIVITY switch to MAX.
(c) SENSITIVITY VERNIER control fully cw.