Tektronix 3B2 TIME-BASE Instruction Manual page 19

TIME/DIV | Time Marks |Adjust/Check | Marks/Div
Switch Setting
20 wSEC 10 psec C260C 2
10 uSEC 10 usec check ]
5 wSEC 5 psec check ]
2 psEC 1 usec C260A 2
50 wSEC 50 psec check 1
LE mSEC 100 usec check ]
.2 mSEC 100 psec check 2
5 mSEC 500 usec check ]
1 mSEC 1 msec check 1
5 mSEC 5 msec check ]
10 mSEC 10 msec check ]
20 mSEC 10 msec check 2
50 mSEC 50 msec check ]
1 SEC 100 msec check 1
2 SEC 100 msec check 2
5 SEC 500 msec check 1
5. Delay Start and Stop
Set the TIME/DIV switch to .2mSEC and apply 1-msec
markers from the time-mark generator. Use the POSITION
control to set the middle marker on the graticule vertical
centerline. Set the DELAY TIME switch to 1 ms, the multiplier
dial to 1.00 and the SWEEP DELAY switch to IN. Adjust the
DELAY START control (R154) so the middle marker is on the
graticule centerline. Turn the multiplier dial to 9.00, and
adjust the DELAY STOP control (R145) so the 9th marker is
on the graticule centerline. Due to interaction of these
controls, it may be necessary to repeat this step several
times until the Ist and 9th time marks are exactly on the
centerline.
Calibration — Type 3B2
6. 10-usec Delay Sweep Rate
Set the TIME/DIV switch to 24SEC, and apply 10-usec
time marks. Set the DELAY TIME switch to 10 ys, and the
multiplier dial to 1,00. Use the POSITION control to position
the middle time mark on the graticule centerline. Turn the
multiplier dial to 9.00 and adjust C80F so the time mark is
exactly on the graticule centerline.
7. Delay Sweep Rates
Use the TIME/DIV switch settings and time marks listed
in Table 6-2. For each setting of the TIME/DIV switch, set
the multiplier dial to 1.00, and position the time mark on
the graticule centerline. Then check each major division
(2.00, 3.00, etc.) for time-mark alignment between 1.00 and
9.00. The timing error should not exceed 1% (+4 minor
divisions on multiplier dial).
TABLE 6-2
TIME/DIV Time Marks DELAY TIME
Switch Setting Switch Setting
20 pSEC 100 psec .1 ms
2 mSEC 10 msec 10 ms
20 mSEC 100 msec ls
.2 SEC ] sec Ts
8. Sweep Takeoff Dc Level
sweep). Connect the de voltmeter to the pin of the SWEEP
TAKEOFF DC LEVEL control (R310) to which the coaxial lead
is soldered. Adjust the SWEEP TAKEOFF DC LEVEL control
for zero volts.
6-3