Divisions - Tektronix 7B70 Time Base Instruction Manual

Performance CheckICalibration-7B70 (SN B205000 and Up)
Fig.
5-6.
C R T display when checking sweep length.
Fig. 5 8 . C R T display showing correct 5
ps
timing.
b. Move the eleventh 1 ms marker to the center vertical c. CHECK-CRT display for a two-division maximum
line with the horizontal POSITION control. See Fig. 5-6. spacing between markers (indicates adequate range for
continuously variable sweep rate between the calibrated
steps; see Fig. 5-7). Return the VARIABLE TIMEIDIV to
c. CHECK-Sweep length must be between 10.5 and 13
the CAL IN position.
divisions.
NOTE
21. Check Variable TimeIDiv
For the following steps, the 7B70 must be installed
a. Reset the TIMEIDIV to 2 ms. Set the time-mark gen-
inside the oscilloscope (not on the extender). I f the
erator for 10 ms markers.
optional flexible plug-in extender is available, the
7 A 16A
may be connected through i t to provide easier
access to adjustments on the left side of the
7B70.
b. Press and release the VARIABLE TIMEIDIV knob
and turn fully counterclockwise.
22. CheckIAdjust 5 ps Timing (C530J)
0
a. Set the Time-Mark Generator for 5
p s
markers.
b. Reset the TIMEIDIV to 5ps and adjust the LEVEL1
SLOPE control for a stable display.
c. CHECK-CRT display for one marker each division
between the second and tenth vertical lines. Check that
sweep timing i s within 0.16 division (2%) over the center
eight divisions. See Fig. 5-8.
d. ADJUST-C530J (left side, front below center) for
Fig. 5-7. Typical C R T display when checking VARIABLE control
One marker each division. The second and tenth markers
range.
must coincide exactly with their respective graticule lines.
Scans by ArtekMedia O 2006