Tektronix WFM601, Service Manual

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Performance Verification
WFM 601 - Service Manual
4–11
e. CHECK – the vertical amplitude of the scope display for 0.72 to 0.88
volts.
f. Remove the cable from the SERIAL OUT.
g. Enter the GAIN menu and turn on VARIABLE.
h. Select X5 and adjust VAR GAIN to make the last step of the color bar
staircase 4 divisions high.
i. Select X10.
j. CHECK – that the last step of the color bar staircase is now 8 divisions
in amplitude.
k. Select X1.
l. Enter the CONFIG menu and select CALIBRATE. Turn CAL SIG ON.
Press the CLEAR MENU button to turn off the readout.
m. CHECK – for a calibrator signal display of 700 mV
"
7 mV.
n. Select X5.
o. CHECK – adjust the VAR GAIN control for a 7 division signal
amplitude. (Variable gain should still be turned on from step g.)
p. Select X1.
q. Adjust the VAR GAIN for maximum signal amplitude.
r. Position the bottom of the display to the –.3 graticule line.
s. CHECK – for a display amplitude of
w
9.8 divisions (–.3 to +6.8).
t. Turn VARIABLE OFF and exit the GAIN menu.
9. Check Voltage and Timing Cursors
REQUIREMENT – Voltage Accuracy:
"
0.5%. Timing Accuracy
$
1%.
a. Set the signal blanking level to the CRT graticule baseline.
b. Enter the CURSOR menu (VOLT should be selected). Press the
CLEAR MENU button if desired to remove the menu readout.
c. Set the Volt1 cursor to the 0.7 V line on the graticule.
d. Set the Volt2 cursor to the graticule baseline (0 V).
e. CHECK – that the cursor reading is 697 to 703 mV.
f. Go to the CURSOR MENU and select TIME.