Tektronix 7B92 Instruction Manual page 44

b. Set the 7B92 and oscilloscope Intensity controls for
an optimum AL T Sweep Display. Position the display as
necessary.
yic. CHECK-Using the Time/Division switch settings
and the time-mark generator settings given in Table 4-1,
check delaying and delayed sweep timing to the tolerance
given in Table 4-1. Make timing checks in the AL T Sweep
Display Mode. The upper trace is the delaying sweep trace
and the lower trace is the delayed sweep trace.
d. CALIBRATION-If the 7B92 does not meet the
requirements given in part c, check the adjustment of the
front-panel SWP CAL (Calibration step 17) and R511
(Calibration step 21). If the adjustment of R511 and the
front-panel SWP CAL does not correct the 7B92 timing
accuracy, check Calibration steps 24 through 28.
Calibration-7B92 Service
Y30. Check Delaying and Delayed Sweep
Linearity
a. Change the following settings:
TIME/DIV OR
DLY TIME
DL Y'D Time/Division
ALT
1 ms
1 ms (Pull out for
INTEN Display Mode)
IN
b. Set the time-mark generator for one-millisecond
markers. Center the display vertically and rotate the MAIN
TRIGGERING LEVEL control for a stable display.
c. Position the second marker to the second graticule
line.
TABLE 4-1
Delaying and Delayed Sweep Timing
TIME/DIV
Tolerance
OR DLY'D Time
CRT Display
(+15°C to +35°C)
DLY TIME Time/Division Markers (markers/division)
Delaying Sweep Delayed Sweep
.2 s .2 s .1 s 2
±0.32 div ±0.32 div
.1 s .1 s
.1 s 1
50 ms
50 ms 50 ms 1
20 ms 20 ms 10 ms 2
10 ms 10 ms 10 ms 1
5 ms 5 ms 5 ms
1
2 ms 2 ms 1 ms 2
1 ms 1 ms 1 ms 1
.5 ms
.5 ms .5 ms 1
.2 ms .2 ms .1 ms 2
.1 ms .1 ms
.1 ms 1
50ps 50 ps 50 ps 1
±0.24 div ±0.24 div
20ps
20 ps 10 ps 2
10 ps 10 ps
10 ps 1
5 ps
5 ps 5ps 1
2 ps 2 ps
1 ps 2
1 ps 1 ps 1 ps 1
.5 ps
.5ps .5 ps 1
.2 ps
.2 ps .1 ps 2
.1 ps
.1 ps .1 ps 1
50 ns 50 ns
50 ns 1
20 ns 20 ns
10 ns 2
±0.32 div (Exclude
10 ns 10 ns 10 ns 1
the first 2 div of
5 ns
5 ns 1
delayed sweep)
2 ns 2ns 1
10 ns 1 ns
2ns
1 cycle/2 div
±0.32 div (Exclude
the first 5 div of
delayed sweep)
.5 ns
2 ns 1 cycle/4 div
±OA div (Exclude
the first 10 divisions
of delayed sweep)
®
4-23
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