Tektronix 067-0521-00, Instruction Manual

Page: 33 / 53

Calibration—
067=0521
-00
6. Check Gain
Set
Function
a. Set the TEST FUNCTION switch to GAIN SET.
b. Set the Calibrator for 100 volts and check the dis­
play for 4 cm of vertical deflection (± 1 % ).
7. Check Common M ode Function
a. Set the TEST FUNCTION switch to C OM M ON
MODE.
b. Set the Calibrator for 2 volts.
c. Connect the test probe to terminal 1, then terminal
3 of the interconnecting plug and check for 2
volts of Calibrator signal at each pin.
d. Remove the probe.
8. Check A lternate Operation
a. Set the TEST FUNCTION switch to ALTERNATE.
b. Set the Calibrator for 100 volts.
c. Set the indicator oscilloscope Trigger Source switch
to External and adjust the triggering control for
a free-running sweep.
d. Turn the indicator oscilloscope Time/Cm switch
through-out its range and check for a display of two
traces on all sweep rates. The lower trace should
display about 0.5 cm of Calibrator signal which w ill
identify the lower trace at slow sweep rates. Due
to the ac coupling in the 067-0521-00, both traces
will tend to curve toward the electrical center of the
vertical system.
9. Check Alternate-Sweep Slaving
NOTE
This check can be made only on an oscilloscope
(such as the Type 547) that can switch alter­
nately between two time bases.
a. Set the indicator oscilloscope Time Base A Time/Cm
switch to 1 msec and the Time Base B Time/Cm
switch to .5 mSec.
b. Set the Triggering Source switches to Plug-In and
adjust the triggering controls of both time bases to
trigger the two displays.
c. Turn the Time Base A Time/Cm switch through a few
positions while watching the display.
d. Check that the lower trace is locked to Time Base A.
e. Turn the Time Base B Time/Cm switch through a few
positions.
f. Check that the upper trace is locked to Time Base
B.
10. Check Chopped Operation
a. Remove the Calibrator signal.
b. Set the TEST FUNCTION switch to CHOPPED.
c. Set the indicator oscilloscope Horizontal Display
switch to Time Base A, Time/Cm switch to lO^tSec,
and the Triggering Source switch to + Internal.
d. Trigger the display and check the chopped wave­
form for 1 cycle/cm (lOOkc) ± 2 0 % .
11. Check Chopped Blanking
a. Set the indicator oscilloscope Crt Cathode Selector
switch to Chopped Blanking and check the crt dis­
play for blanking of the vertical portions of the
chopped waveform (see Fig. 2-3).
b. Return the Crt Cathode Selector switch to the Crt
Cathode position.
12. Adjust DRIVE BAL R40
a. Set the TEST FUNCTION switch to + PULSE.
b. Trigger the pulse display and adjust the AMPLI­
TUDE control for 4 cm of vertical deflection.
c. W ith the test oscilloscope, check the pulse amplitude
at pins 1 and 3 of the interconnecting plug.
d. Adjust DRIVE BAL R40 (see Fig. 6-2) if the am pli­
tudes are not equal.
e. Disconnect the probe.
13. Adjust PULSE DC LEVEL R30
a. Connect the dc voltmeter between chassis ground
and pin 10 of the interconnecting plug.
b. Record the actual voltage of the + 1 0 0 vo lt supply.
c. Do the two mathematical calculations indicated
below.
1. (66.25%) (Voltage recorded in part b) = Lower
limit.
2. (68.86%) (Voltage recorded in part b) = Upper
limit.
d. Disconnect the dc voltmeter.
e. Connect the dc voltmeter between chassis ground
and the junction of R54 and R41 (see Fig. 6-2).
f. Check that the dc voltmeter falls between the upper
and lower limits calculated in part c o f this step.
g. Adjust PULSE DC LEVEL R30 if the voltage does not
fall between the upper and lower limits calculated
in part c.
14. Check Pulse Repetition Rate
a. Check the Pulse Generator display for the following
output repetition rates, with the REPETITION RATE
switch set as follows:
LOW— 5 kc ± 2 5 % (1 cycle/cm at 0.2msec/cm)
MED— lOOkc ± 2 5 % (1.2 cycles/cm a t 10/tsec/
cm)
(B)2
6-3