Pulse Rate

TB 11-6625-2747-50

Table 4. Frequency Dial Performance Check

Test instrument

Frequency counter

frequency dial

indication (GHz)

setting (GHz)

Minimum

Maximum

11.0

10.890

11.110

12.0

11.880

12.120

13.0

12.870

13.130

14.0

13.860

14.140

15.0

14.850

15.150

b. Adjustments.

(2) Without changing PULSE RATE position,

(1) Turn TI SIGNAL FREQUENCY control to 10

loosen knob screws and slip, control so that 100 is

GHz as indicated on the frequency dial.

located under panel index marker. Tighten knob screws.

CAUTION

(R)

The stops for the frequency drive

(3) Check PULSE RATE control calibration at

mechanism are inoperative when the

40 and 400.

frequency dial is not in place.

(4) If necessary, again loosen knob screws and

Rotating the shaft for the frequency

slip control to average error across range. Tighten

dial and frequency drive cam to one

screws. (R) Repeat the performance check.

extreme or the other without these

12. Pulse Delay. a. Performance Check.

stops may result in serious and

(1) Connect TI RF output through crystal

permanent damage to plunger on

detector (B11), adapter (B18), and cable assembly, rf

inner end of frequency drive rod.

(B5) to channel 1 input of oscilloscope (A4).

Handle with care.

(2) Connect TI SYNC OUT connector to EXT

(2) Loosen setscrews holding drive rod (fig. 1)

TRIG IN connector of oscilloscope using cable

to cam follower.

assembly, rf (B5).

(3) With frequency dial at 10 GHz, manually

(3) Turn TI PULSE DELAY control fully

move drive rod in increments of approximately 1/32 inch

counterclockwise, SYNC SELECTOR control to X10,

until output frequency of TI is 10 GHz as indicated on the

and PULSE RATE control to 100.

frequency counter.

(4) Minimum delay from start of trace to leading

(4) Tighten setscrews.

edge of pulse will be less than 5 microseconds as

(5)

Repeat a(1) through (4) and refine the

indicated on the oscilloscope. If not, perform b, below.

adjustment as necessary to ensure that TI indications

(5) Turn TI PULSE DELAY control to 300.

are within tolerance. (R)

(6) Delay from start of trace to leading edge of

11. Pulse Rate. a. Performance Check.

pulse will be at least 300 microseconds as indicated on

CAUTION

the oscilloscope.

Be extremely careful that TI SYNC

b. Adjustments.

OUT is not connected directly to the

(1) Remove TI from case.

frequency counter.

Damage will

(2) Adjust R78 (fig. 2) for a delay less than 5

occur if the 5 V/ +24 dbm max

microseconds as indicated on the oscilloscope. (R)

limitation is not observed.

(3) Turn PULSE DELAY control to 50

(1) Connect frequency counter (A1) to TI SYNC

microseconds as indicated on the oscilloscope.

OUT connector using probe (B21) and adapter (B20).

(4) Loosen setscrews and slip PULSE DELAY

(2) Position TI controls as indicated in (a)

control so that 50 is located under panel index marker.

through (c) below.

Tighten setscrews. (R) Repeat the performance check.

(a) MOD SELECTOR switch to INT.

13. Pulse Width. a. Performance Check.

(b) SYNC SELECTOR switch to X1.

(1) Turn TI PULSE WIDTH control fully

(c) PULSE RATE control to 40.

counterclockwise and PULSE DELAY control fully

(3) Frequency counter will indicate 40 Hz or

counterclockwise.

less.

(2) Connect a 50 ohm load (B22) to the

(4) Turn SYNC SELECTOR switch to TI to X10.

oscilloscope connection with adapter connector "T"

(5) Turn PULSE RATE control of TI to 400.

(B23).

(6) Frequency counter will indicate at least

(3) Minimum pulse width as indicated on the

4,000 Hz.

oscilloscope will be less than 0.5 microseconds. If not,

b. Adjustments.

perform b, below.

(1) Adjust TI PULSE RATE control for 1,000 Hz

(4) Turn TI PULSE WIDTH control to 10.

as indicated on the frequency counter.

(5) Pulse width as indicated on the oscilloscope

will be at least 10 microseconds.