TB 9-6625-2139-24
(h) A TRIGGER SLOPE pushbutton to OUT.
(i) A TRIGGER LEVEL control to midrange.
A TRIGGER A TRIG BW switch to FULL (AN/USM-488).
(j)
(k) A TRIGGER A&B INT switch to VERT MODE (type 2235).
(l) A TRIGGER A SOURCE switch to INT.
(2) Connect TI CH 1 to TI AMP CAL (PROBE ADJUST on type 2235).
(3) Set TIME/DIV and CH1 VOLTS/DIV switches as listed in table 26. Adjust
CH1 VOLTS/DIV CAL control for 5 divisions of vertical deflection on TI.
(4) Remove connection at TI CALIBRATOR and connect to oscilloscope calibrator
CHAN 1.
(5) Set oscilloscope calibrator VOLTAGE output as listed in table 26.
(6) Adjust A TRIGGER LEVEL and CH 1 and horizontal POSITION controls, as
necessary, to view waveform.
(7) Rotate oscilloscope calibrator knob below EDIT FIELD pushbutton to adjust for
5 divisions of vertical deflection on TI. Oscilloscope calibrator err display will indicate as
specified in table 26; if not, perform b below.
Table 26. Test Instrument Calibrator Output Check
Oscilloscope calibrator
Test instrument
Test instrument
VOLTAGE
Err
switch settings
output settings
display limits
(%)
VOLTS/DIV
TIME/DIV
Amplitude
21
0.1
0.5 ms
500 mV pp
1 kHz
1r5
% for type 2235.
b. Adjustments
(1) Rotate CH 1 VOLTS/DIV CAL knob fully clockwise to detent.
(2) Connect CH 1 input to oscilloscope calibrator CHAN 1.
(3) Set oscilloscope calibrator VOLTAGE output as listed in table 26.
(4) Adjust TI CH 1 POSITION control to view waveform.
(5) Record waveform amplitude.
(6) Move connection from oscilloscope calibrator CHAN 1 to AMP CAL located on
TI front panel using adaptors as necessary.
(7) Adjust R984 AMPLITUDE CALIBRATOR (fig. 2) for waveform amplitude for
recorded amplitude in (5) above. (R)
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