TB 9-4931-217-40
17. Equipment Setup
a. Disconnect and remove TI from impedance measuring system.
b. Connect TI to dc generator detector, using cable, shield, and ground plugs supplied
with TI.
c. Turn dc generator detector GENERATOR POWER LIMIT control to 25
MILLIWATTS.
d. Press dc generator detector ON/OFF pushbutton to ON and allow at least 15
minutes for equipment to warm-up and stabilize.
18. Range Switch and Main Dial Tracking
a. Performance Check
(1) Position controls as listed in (a) through (c) below:
(a) FUNCTION switch to R.
.
(b) RANGE switch to 10-4 k
(c) MAIN DIAL to 0.0000.
(2) Connect TI UNKNOWN terminals 1 and 2 to one terminal of resistor standard
no. 1, using two wires.
(3) Set dc generator detector GENERATOR RANGE switch to 100 and
DETECTOR SENSITIVITY control fully ccw to CALIBRATED position.
(4) Position dc generator detector controls as listed in (a) through (c) below:
(a) DETECTOR RANGE switch to 1000 VOLTS.
(b) GENERATOR OUTPUT +/OFF/- switch to + (positive).
(c) DETECTOR RANGE switch ccw for a convenient indication on dc
generator detector, null meter.
(5) Adjust MAIN DIAL for a null indication on dc generator detector null meter.
NOTE
When dc generator detector null meter fluctuations are visible,
determine average value for fluctuations and consider this
value to be dc generator detector nun meter indication.
(6) Sit dc generator detector GENERATOR OUTPUT +/OFF/- switch to OFF and
adjust DETECTOR ZERO control until null meter indicates 0 (zero).
(7) Repeat (4) (b) and (c) through (6) above until dc generator detector null meter
indicates best null indication with GENERATOR OUTPUT +/OFF/- switch set to +
(positive) and 0 (zero) with switch set to OFF.
(8) Set dc generator detector DETECTOR RANGE switch to 1000 MILLIVOLTS.
(9) Convert MAIN DIAL and RANGE switch indications to resistance and record value.
