TB 9-6625-2164-24
bx. Press f (function) and MENU/TEST pushbutton.
by. Select CALIBRATION MENU by pressing MEMORY DISPLAY pushbutton 2.
CALIBRATION MENU will be displayed on TI.
bz. Select FAST RAMP GAIN/COUNT by pressing MEMORY DISPLAY pushbutton 1.
ca. The FAST RAMP TEST/ * SERVICE ONLY * and GAIN COUNT will be
displayed (flashing) on TI. TI display GAIN will indicate between 99.7 and 100.3; if not,
adjust RAMP GAIN R320 (fig. 5) for GAIN indication of 100.0.
cb. Press MEMORY DISPLAY 6, f (function) and MENU/TEST pushbuttons.
cc. Set CH 1 VOLTS/DIV switch to 50 mV and press AC pushbutton.
cd. Set TIME/DIV switch to 2 s.
ce. Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 output to CH 1
input using 50 termination.
Figure 5. Tektronix, Type 7D20 right side view - adjustment locations.
cf. Press oscilloscope calibrator EDGE key and then press FAST EDGE soft-key for a
FAST EDGE output and set for 250 kHz frequency.
cg. Adjust TI controls for a display of 5 divisions centered vertically.
ch. Set TIME/DIV switch to 50 ns.
ci. Press pushbuttons TRIG POS to read TPOS 1 on TI display (+ SLOPE if signal is
not positive).
1
pushbutton to read T=0.0S on TI display.
cj. Press CURSOR
ck. Press
TRIGGERING/MODE
AUTO,
TRIGGERING/COUPLING
DC
pushbuttons. TI display CURSOR dot indication will be within 2 vertical divisions of center
graticule line; if not, adjust RAMP OFFSET R732 (fig. 5) so CURSOR dot is within 1
vertical division of center graticule line.
NOTE
Adjustment of RAMP OFFSET R732 affects the adjustment
setting of RAMP GAIN R320 (fig. 5). Repeat bu through ca
above.
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