Tektronix 7B92A Maintenance Manual page 62

TIME/DIV
OR
DLY TIME
5 ns
2 ns
B4 Check Sweep Linearity
a. Set the TIME/DIV OR DLY TIME and
DLY'D Time/Division switch to 1 ms and pull DLY'D
Time/Division knob out for Alternate mode.
b. Set the time-mark generator for 1 ms markers.
c. Position the Delaying (top) and Delayed-sweep
traces horizontally to start on the first graticule line.
d. Check-that the fourth marker of the Delaying
sweep coincides within 0.1 division with the fourth
vertical graticule line.
e. Check-continue linearity check, as in part d of
this step, for each successive two divisions of the
Delaying sweep.
f. Check-repeat parts d and e of this step to
check linearity of the Delayed (bottom) sweep.
g. Set the TIME/DIV OR DLY TIME and DLY'D
Time/Division switch to 10 ns and pull DLY'D Time/Divi-
sion knob out for Alternate mode.
h. Set the time-mark generator for 10 ns markers.
i. Check-perform linearity check as in parts d, e,
and f of this step. Tolerance is 0.1 division for each two
divisions over center eight graticule divisions.
j. Set the DLY'D Time/Division to Normal mode
(knob
Table 5-3.
FAST TIMING
Time-Mark
Generator
Setting Markers/Division
5 ns
2 ns
in).
5-12
Performance Check/Calibration-7B92A
Display
1
1
k. Check-continue linearity check for Delayed
sweep rates as shown in Table 5-4.
FAST SWEEP LINEARITY
Time-mark
Time/ Generator
Division Setting
5 ns 5 ns
2 ns 2 ns
B5 Check Variable Time/Division Range
a. Remove the 7B92A from the oscilloscope plug-
in compartment.
b. Place the Time/Division Variable Selector
multi-pin connector on P761 (Delaying Sweep). See Fig.
1-1 for location.
c. Insert the 7B92A into the oscilloscope plug-in
compartment; turn on the power to the oscilloscope.
d. Set the time-mark generator for 100 us
markers.
e. Set the TIME/DIV OR DLY TIME and DLY'D
Time/Division switch to 20 ,us and pull DLY'D
Time/Division knob out for Alternate mode. Check that
the DELAY TIME MULT dial is 0.0.
Tolerance
(+15°C to +35°C)
Within 0.24 div
Within 0.24 div
Table 5-4.
Markers/ Tolerance/
2 Divisions 2 Divisions
2 0.2 div
2 0.2 div