Tektronix WFM601, Service Manual

Page: 96 / 304

Performance Verification
4–8
WFM 601 - Service Manual
c. CHECK – that the TRACE ROTATE control moves the trace
w
+ & –
1
°
from the graticule baseline.
d. Adjust the TRACE ROTATE control for a level trace across the graticule
baseline.
e. From the CRT menu select DISPLAY.
f. CHECK – that the SCALE control changes the graticule illumination
from completely extinguished to fully illuminated.
g. Adjust the SCALE control for the desired graticule illumination.
h. Exit the CRT menu.
NOTE . Intensity, readout intensity, and focus are also controlled from the CRT
menu. If any of them needs adjusting during the performance of this procedure,
select the CRT menu and adjust as necessary. The levels set will remain after
the CLEAR MENU or CRT menu button is pushed.
4. Check Horizontal Mag Registration and Position Range
REQUIREMENT – Any portion of the synchronized sweep can be positioned
onscreen in all sweep modes.
a. Horizontally center the display, and then turn on the MAG SWEEP.
b. CHECK – that the start of the trace is displayed.
c. CHECK – by adjusting the HORIZ POS control, that both ends of the
display can be positioned past the center of the CRT.
d. Turn Off the MAG SWEEP.
5. Check Calibrator Timing Frequency
REQUIREMENT – Frequency: 100 kHz
"
0.1%.
a. Set the frequency counter Timing to 1
m
s.
b. Connect a X1 probe from the frequency counter to the ribbon cable side
of A3R274 (Main board).
c. Connect the probe ground to the metal shield adjacent to A3L5.
d. Adjust the frequency counter controls for a stable readout.
e. CHECK – that the counter reading is 100 kHz
"
0.1 kHz.