TB 9-4931-444-35
b `Adjustments No adjustments can be made.
(d) Both A&B 2-200 VAR switches to CALIB.
(e) Channel A NORM/INV switch to NORM.
11. .Amplitude Control
(f) Channel B NORM/INV switch to INV.
a. Performance Check
( 3) Position plug-in (A5) controls as listed in (a)
through (f) below:
(I) Turn TI REPETITION RATE switch to 500 kHz
(a) TIME/DIV control to 1 nSEC.
(HIGH).
(b) VARIABLE control to CAI.IB.
(2) Position oscilloscope (A3) controls as listed in (a)
(c) HORIZ NMAG switch to XI.
through (c) below:
(d) DOTS PER DIV switch to 10.
(a) MODE switch to ADDED and INV (CHI).
(e) SWEEP MODE switch to NORMAL.
(b) Both VOLTS/DIV switches to .1 VOLTS.
(c) VARIABLE control to CALIB.
(f) TRIGGER switch to +INT.
(3) Turn TI AMPLITUDE control fully clockwise.
(4) Connect equipment as shown in figure 1, except
Oscilloscope will indicate at least 560 millivolts.
for adapters (BI and B3).
(4) Turn TI amplitude control fully counterclockwise.
(5) Turn TI REPETITION RATE switch to 0SO kHz
Oscilloscope X ill indicate 280 millivolts or less.
(MED) and adjust AMPLITUDE control for 4 centimeters
b. Adjustments. No adjustments can be made.
of vertical deflection on oscilloscope crt.
(6) Measure rise time, using standard rise-time
12. Pulse Rise Time
techniques. Rise time will be 3 nanoseconds or less.
Overshoot and ringing will be less than t2 percent of total
a. Performance Check
height.
b. Adjustments. No adjustments can be made.
(1) Remove oscilloscope (A3) plug-ins and insert
plug-ins (A4 and AS) into left and right compartments,
respectively.
13. Final Procedure
(2) Position plug-in (A4) controls as listed in (a)
through (f) below:
a. Deenergize and disconnect all equipment.
(a) NIODE switch to A+B.
b. In accordance with TM 38-750, annotate and affix
(b) INTERNAL TRIGGER to A.
DA Label 80 (US Army Calibration S stem). When the TI
(c) A&B MV/DIV switches to 50.
cannot be adjusted within tolerance, annotate and affix
DA Form 2417 (Unserviceable or Limited Use) tag.
SECTION V
PRELIMINARY OPERATIONS (LEVEL C)
b. Connect autotransformer to a 115-volt ac source
14. Preliminary Instructions
and adjust controls for a 115-volt output.
c. Energize equipment and allow sufficient time for
a. The instructions contained' in this section are
warmup.
preparatory to the calibration process. Personnel should
d. Position TI controls as listed in (1) through (5)
become familiar with sections I, II, V, and VI before
beginning the calibration.
below:
b. Items of equipment used in this procedure are
(1) TEST FUNCTION switch to LOW LOAD.
referenced within the text by common name and item
(2) REPETITION RATE switch to MED (or 80
identification number as listed in tables 2 and 3. For the
kHz).
identification of equipment referenced by item numbers
(3) VARIABLE control to midrange.
(4) AMPLITUDE control to midrange.
(5) VERTICAL POSITION control to midrange.
WARNING
e. Position oscilloscope controls as listed in (1)
HIGH VOLTAGE is used during the
through
performance of this calibration DEATH
(4) below:
ON CONTACT may result if personnel
(1) HORIZONTAL DISPLAY switch to A.
fall to observe safety precautions.
(2) TIME BASE A TIME/CM switch to 1 mSEC.
(3) TRIGGERING MODE switch to AUTO.
15. Equipment Setup
(4) TRIGGER SLOPE switch to + INT.
a. Install TI in oscilloscope (A3) and connect
oscilloscope to auto-transformer (Al).
SECTION VI
CALIBRATION PROCESS (LEVEL C)
NOTE
16. +225 V Output
a. Performance Check
Unless otherwise specified. verify the
result of each test and take corrective
(1) Connect de voltmeter (A2) between TI +225V
action whenever the test requirement is
jack and chassis ground, using test leads (B9).
not met before continuing with the
calibration.
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