TB 9-6625-1914-24
36. Scan Accuracy
a. Performance Check
(1) Position TI controls as listed in (a) through (d) below:
(a) FREQUENCY controls to 700 MHz.
(b) BANDWIDTH switch to 300 kHz.
(c) SCAN WIDTH PER DIVISION switch to 100 MHz.
(d) INPUT ATTENUATION switch to 0 dB.
(2) Position IF plug-in controls as listed in (a) through (d) below:
(a) SCAN TIME PER DIVISION switch to 10 ms.
(b) LOG REF LEVEL controls to +10 dBm.
(c) VIDEO FILTER switch to ON.
(d) SCAN TRIGGER switch to AUTO.
(3) Adjust SCAN WIDTH PER DIVISION, FREQUENCY controls, and signal
generator frequency as listed in table 9. Signal pip will align to crt graticule as indicated.
Table 9. Scan Accuracy
Test Instrument
Adjust FREQUENCY to
Signal generator
SCAN WIDTH PER DIVISION
align signal pip to crt
Signal pip aligns
(MHz)
(MHz)
graticule
to crt graticule
5001
-22
100
1000
+3 (+0.5)
650
10
-5
730
+3 (+0.8)
695
1
-5
703
+3 (+0.8)
1Adjust signal generator amplitude to produce a usable display on crt.
2Readjust TI INPUT ATTENUATION and LOG REF LEVEL controls as necessary.
(4) Connect equipment as shown in figure 5.
(5) Position TI controls as listed in (a) through (e) below:
(a) BANDWIDTH switch to 3 kHz.
(b) FREQUENCY control to 400 MHz.
(c) VIDEO FILTER switch to OFF.
(d) TUNING STABILIZER switch to OFF.
(e) SCAN WIDTH PER DIVISION switch to 50 kHz.
(6) Adjust signal generator frequency and amplitude controls for cw operation at
400 MHz and usable display on crt.
(7) Adjust TI FREQUENCY controls to center switch pip display.