Fast Delay Time Accuracy - Tektronix 7B92A Maintenance Manual

Table 5-10.
DIFFERENTIAL DELAY TIME ACCURACY
TIME/DIV OR DLY'D
DLY TIME Time/Division
.2 s 5 ms
.1 s 2 ms
50 ms 1 ms
20 ms 0.5 ms
10 ms 0.2 ms
5 ms 0.1 ms
50 µs
2 ms
20 µs
1 ms
10 µs
.5 ms
5 µs
.2 ms
2 µs
.1 ms
50 µs 1 µs
20 µs .5 µs
10 µs .2 µs
.1 µps
5 ps
2 µs
50 ns
1 µs
20 ns
.5 µs
10 ns
.2 µs
5 ns
.1 µs
5 ns
C16. Check Fast Delay Time Accuracy
a. Set the TIME/DIV OR DLY TIME switch to 50 ns,
DLY'D Time/Division switch (pull knob out) to 10 ns(then
push knob in), and adjust the MAIN TRIGGERING
LEVEL control for a stable display (TRIG'D light on).
b. Set the time-mark generator for 50 ns markers.
c. Set the vertical amplifier plug-in unit deflection
factor for approximately two divisions of display.
d. Set the DELAY TIME MULT dial to 9.00.
Time-mark
Generator
Setting
0.1 s
50 ms
10 ms
10 ms
5 ms
1 ms
1 ms
0.5 ms
0.1 ms
0.1 ms
50 µs
10 µs
10 µs
5 µs
1 µs
1 µs
0.5 µs
0.1µs
50 ns
50 ns
5-39
Performance Check/Calibration-7B92A
e. Align the leading edge of the time-mark to the
center vertical graticule line, using the POSITION
control. See Fig. 5-15 for reference.
Fig. 5-15. Fast delay time accuracy.
f. Check-set the DELAY TIME MULT dial to the
settings listed in Table 5-11,'and check vor maximum
error in dial reading.
Table 5-11.
FAST DIFFERENTIAL DELAY TIME ACCURACY
DELAY TIME MULT
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
g. Set the TIME/DIV OR DLY TIME switch to 20 ns,
DLY'D Time/Division switch (pull knob out) to 2 ns (then
push knob in), and adjust the MAIN TRIGGERING
LEVEL control for a stable display (TRIG'D light on).
h. Set the time-mark generator for 20 ns markers.
Maximum Error
(Minor Dial Divisions)
0 (step e)
Within 3.0
Within 3.5
Within 4.0
Within 4.5
Within 5.0
Within 3.0
Within 6.0
Within 6.5