TB 9-4931-444-35
b. Adjustments. No adjustments can be made.
(2) Depress and hold 1T +225V pushbutton. Dc
voltmeter will indicate between 220.5 and 229.5 volts dc.
20. Common Mode
(3) Release pushbutton and disconnect de voltmeter.
b. Adjustments. No adjustments can be made.
a. Performance Check
17. Variable Control
(1) Set TI TEST FUNCTION switch to COMMON
MODE.
a. Performance Check
(2)
Set
oscilloscope
(A3)
AMPLITUDE
(I1) Connect oscilloscope (A3) CAL OUT to TI EXT
CALIBRATOR switch to OFF.
INPUT, using cable and adapter (B5 and BI) as required.
(3) Connect oscilloscope CAL OUT to TI EXT
(2) Set oscilloscope AMPLITUDE CALIBRATOR
INPUT, using cable (B5).
switch to .5 VOLTS.
(4) Observe position of trace on oscilloscope crt and
(3) Turn TI VARIABLE control fully clockwise.
set AMPLITUDE CALIBRATOR switch to I VOLT.
Oscilloscope crt will display square wave with amplitude
Display on crt will not vary by more than 1 centimeter.
b. Adjustments. No adjustments can be made.
.6 centimeter or greater.
(4) Turn TI VARIABLE control fully counterclockwise.
21. Alternate Mode
Oscilloscope will display a single trace on crt.
b. Adjustments. No adjustments can be made.
a. Performance Check
18. Vertical Position
(1) Set TI TEST FUNCTION switch to ALTERNATE.
a. Performance Check
through (c) below:
(a) AMPLITUDE CALIBRATOR switch to 100
(1)
Set
Oscilloscope
(A3)
AMPLITUDE
CALIBRATOR switch to 10 VOLTS.
VOLTS.
(2) Adjust TI VARIABLE control for oscilloscope crt
(b) TIME BASE A STABILITY control fully clockwise.
(c) TIME BASE A TRIGGERING MODE switch to
square-wave display 6 centimeters in amplitude.
AC.
(3) Turn TI VERTICAL POSITION control fully
(3) Set oscilloscope TIME/CM switch to all positions,
clockwise and fully counterclockwise. Oscilloscope crt
display will move completely off graticule in both
directions.
b. Adjustments. No adjustments can be made.
b. Adjustments. No adjustments can be made.
19. Gain Set
22. Chopped Mode
a. Performance Check
a. Performance Check
(1) Turn
oscilloscope
(A3)
AMPLITUDE
NOTE
CALIBRATOR switch to OFF and TIME/CM switch to 10
For users of AN/GSM-256 and AN/GSM-
NSEC.
(2) Set TI TEST FUNCTION switch to CHOPPED.
259 equipment, remove TI from
(3) Adjust oscilloscope controls for a stable display.
oscilloscope
(A3)
and
perform
Oscilloscope crt will display between 8 and 12 complete
waveforms within 10 centimeters, as illustrated in figure
5.
(4) Set oscilloscope CRT CATHODE SELECTOR
8, insert TI
into oscilloscope and
switch (rear panel) to DUAL-TRACE CHOPPED
BLANKING. Crt will display blanked rising and falling
portions of waveform, as illustrated in figure 6.
b. Adjustments. No adjustments can be made.
(1) Set oscilloscope (A3) POWER switch to down
(off) position.
(2) Remove TI from oscilloscope and connect
23. Pulse Amplitude
a. Performance Check
(3) Energize equipment and set ratio transformer
(1) Set oscilloscope (A3) CRT CATHODE
(A6) decade dials to .00400.
(4) Set voltage standard (AS) dials to 035.3500.
SELECTOR switch to EXT CRT CATHODE and
TIME/CM switch to 2 SEC.
(5) Adjust voltage standard frequency for 400 Hz and
(2) Position TI controls as listed in (a) through (C)
amplitude output for a 4-centimeter peak-to-peak display
below:
on oscilloscope crt.
(6) Set TI TEST FUNCTION switch to GAIN SET.
(a) REPETITION RATE switch to HIGH (or 500 kHz).
(b) TEST FUNCTION switch to +PULSE.
(c) AMPLITUDE control fully counterclockwise.
centimeter peak-to-peak display on oscilloscope crt.
X1000.
8