Tektronix 7B92A Maintenance Manual page 87

NOTE
If the time-mark generator used does not have 1-2-5
sequence markers, apply 1 unit markers in place of 2
unit markers and check for 2 markers/division over the
center eight divisions of display, to the tolerances given
in Table 5-7.
c. Push in the DLY'D Time/Division knob and
position the display to the center of the graticule.
TIME/DIV
OR
DLY TIME
5 ns
2 ns
C13. Check Sweep Linearity
a. Set the TIME/DIV OR DLY TIME and DLY'D
Time/Division switch
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.
Time-Mark
Generator
Setting
5 ns
2 ns
to 1 ms and pull
d. Check-using the settings given in Table 5-8, check
sweep accuracy over the center eight divisions within the
tolerance given in Table 5-8.
The HF SYNC MODE switch may provide a better
display when checking the fastest sweep rates.
Table 5-8.
FAST TIMING
Display
Markers/Division
1
1
g.
Time/Division
Time/Division knob out for Alternate mode.
h.
DLY'D
i.
and f of this step. Tolerance is 0.1 division for each two
divisions over center eight graticule divisions.
j.
(knob in).
k.
sweep rates as shown in Table 5-9.
Time/
Division
5 ns
2 ns
5-37
Performance Check/Calibration-7B92A
NOTE
Tolerance
(+15°C to +35°C)
Within 0.24 div
Within 0.24 div
Set the TIME/DIV OR DLY TIME and DLY'D
switch to 10
Set the time-mark generator for 10 ns markers.
Check-perform linearity check as in parts d, e,
Set the DLY'D Time/Division to Normal mode
Check-continue linearity check for Delayed
Table 5-9.
FAST SWEEP LINEARITY
Time-mark
Generator Markers/
Setting 2 Divisions 2 Divisions
5 ns 2
2 ns 2
ns and pull DLY'D
Tolerance/
0.2 div
0.2 div