Tektronix WFM 601A, Service Manual

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Performance Verification
4–12
WFM 601A, WFM 601E, & WFM 601M Service Manual
j. CHECK – that the cursor reading,
n
T, is 99 to 101
m
s.
k. Exit the CURSOR menu.
9. Low-pass Filter Gain
REQUIREMENT – Low Pass Filter Gain: 1 1%.
a. To load the factory preset, press the PRESET button, use the bezel knob
to pick the FACTORY setting, then press the RECALL bezel button.
b. Turn off CH 2 and CH 3 on the waveform monitor.
c. Set the serial component generator output to the 60% Multiburst signal:
Modules DVG1
Signal Sets 525–270
Test Signals Frequency Resp
Frequency Resp 60% Multiburst
d. Select the LPASS filter by pressing the FILTER button and the LPASS
bezel button.
e. Select a One Line Sweep display (5
m
s/div).
f. CHECK – that the peak-to-peak amplitude of the second packet or burst
from the left is
300 mV.
g. Enter the GAIN menu and set the gain for X5.
h. CHECK – that the peak-to-peak amplitude of packets five and six (from
the left) are 4 mV (1 minor division).
i. Select the FLAT filter in the Filter menu.
j. Select the Pulse and Bar signal from the serial component generator.
k. With the VERT POS bezel knob, center the baseline of the signal on the
0 V graticule line. Gain is still at X5.
l. Press the CURSOR menu button.
m. Use the VOLT2 bezel knob to place the VOLT2 cursor on the baseline of
the signal.
n. Rotate the VERT POS bezel knob counterclockwise to bring the top of
the square pulse onto the CRT. Place the top of the square pulse on the
.7 V graticule line.
o. Use the VOLT1 bezel knob to place the cursor on the top line of the
square pulse.
p. Record the cursor voltage reading.