Tektronix WFM601, Руководство по обслуживанию

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Performance Verification
4–16
WFM 601 - Service Manual
d. Connect the function generator output via the audio remote cable adapter
to the WFM 601 rear-panel REMOTE INPUT connector pins 8 and 10.
Ground pins 9 and 11 of the REMOTE INPUT connector.
e. Set the function generator for a sinewave output. Adjust the frequency
to 1 kHz and the amplitude to 2.19 V.
f. CHECK – that the trace ends land on the audio box cross hairs.
g. Repeat parts a. through f. using the Gain and signal amplitude settings in
Table 4–1.
Table 4–1: Audio Values
GAIN SIGNAL AMPLITUDE (V
PP
)
0 dBu 2.19 V
4 dBu 3.47 V
8 dBu 5.50 V
12 dBu 8.71 V
17. Check Audio Phasing and Bandwidth
REQUIREMENT – X/Y Input Phase Match:
v
1
°
(measured at 20 kHz).
Audio Bandwidth: –3 dB at
w
500 kHz.
a. Re-enter the GAIN menu and select 0 dBu.
b. Set the function generator Frequency to 20 kHz and the amplitude to
2.19 V.
c. Move the display onto the audio graticule using the VERT and HORIZ
POS controls. Make sure that both ends of the display are in the
1
/
2
dB
target boxes.
d. CHECK – for no more than a trace width of eye opening in the audio
signal (1%).
e. Set the function generator frequency to 500 kHz.
f. Disconnect the signal from pin 8 of the rear-panel REMOTE connector.
g. CHECK – for a horizontal line >5.6 divisions long.
h. Reconnect the signal to pin 8 and disconnect it from pin 10 of the rear
panel REMOTE connector.
i. CHECK – for a vertical line >7 divisions long.