Table of Contents
Advertisement
Timing adjustments
and checks are made
between the 1 -im and
9-cm graticule marks
Fig. 6-30. Typical displa y, sweep tim ing adjustm ent; 1 millisecond
markers;
SWEEP TIM E/CM
switching,
c. Check— One marker/cm, ± 3 % .
d. Adjust C160C for one marker/cm.
44. Adjust Sweep Timing— 1 ^SEC/CM
a. Change the time-mark generator output to 1-micro
second markers.
b. Change the SWEEP TIME/CM switch to 1 /iSEC.
c. Connect a 50-ohm cable from the time-mark generator
trigger output connector to the EXTERNAL TRIG. IN con
nector, and set the generator to supply 10-microsecond
triggers.
d. Change the SOURCE switch to EXT.
e. Check— One marker/cm, ± 3 % .
f. Adjust C160A for one marker/cm.
45. Check Variable Control Ratio
a. Rotate the SWEEP TIME/CM VARIABLE control fully
counterclockwise.
b. Check— 2.5 times as many markers in a given dis
play area.
c. Return the VARIABLE control fully clockwise.
46. Check Sweep Timing
a.
Set the time-mark generator and Type 503 as indicated
in Table 6-7, checking for timing accuracy tolerances as
shown.
NOTE
The 1 mSEC tim ing adjustm ent (SWP. CAL R322)
may be readjusted as necessary, w ith in the to le r
ance limits, to brin g a ll o th e r tim ing ranges w ithin
perform ance requirements.
tc)
1 mSEC.
O
TABLE 6 -7
SWEEP
Tim e-M ark
TIM E/CM
G enerator
Setting
Setting
2 mSEC
1 ms
5 mSEC
5 ms
10 mSEC
10 ms
20 mSEC
10 ms
50 mSEC
50 ms
.1 SEC
100 ms
.2 SEC
100 ms
.5 SEC
500 ms
1 SEC
1 sec
2 SEC
1 sec
5 SEC
5 sec
.5 mSEC
500 /rs
.2 mSEC
100 Ms
.1 mSEC
100/is
10 fxSEC
1 0 / i s
20 ju,SEC
1 0 / i s
50 /i.SEC
50 fts
1 ix SEC:'
1 / I S
2 /iSEC1
1
/ I S
5/cSEC
5 as
47. Adjust Sweep Magnifier Registration
a. Set the SWEEP TIME/CM to 1 mSEC.
b. Set the time-mark generator to supply 5-millisecond
markers.
c. Check that the SOURCE switch is set to I NT., and
adjust the LEVEL control.
d. Center the first time mark to the graticule center
vertical line with the HORIZONTAL POSITION control.
e. Change the HORIZONTAL DISPLAY switch to X50,
and re-center the first time mark to the graticule center line.
f. Change the HORIZONTAL DISPLAY switch to SWEEP
NORMAL ( X I) .
g. Check— No more than 0.5 cm shift of the first time
mark as the HORIZONTAL DISPLAY switch is changed from
X 50 to X I .
h. Adjust SWP/MAG. REGIS. R339 to center the first
time mark to the graticule center vertical line.
i.
Interaction— Repeat steps (e) through (h) until the first
time mark remains centered through all positions of the
HORIZONTAL DISPLAY SWEEP MAGNIFIED switch.
'Use external trig gerin g; i.e., connect a UHF T connector and an
a d d itio n a l 50-ohm cable from the tim e-m ark generator to the EX
TERNAL TRIG. IN connector, change the SOURCE switch to EXT,,
and ob tain a stable displa y w ith the LEVEL control.
C a lib ra tio n — Type 503
Check
Tolerance
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
1 mark/cm
± 3 %
2 marks/cm
± 3 %
1 mark/cm
± 3 %
O
6-29
Advertisement
Chapters
Table of Contents
