Tektronix WFM 601A, Руководство по обслуживанию

Страница: 86 / 368

Performance Verification
4–22
WFM 601A, WFM 601E, & WFM 601M Service Manual
21. Eye Gain (WFM 601E, WFM 601M only)
REQUIREMENT – 800 mV 5% with a 800 mV signal.
a. Connect the leveling head from the leveled sine wave generator to a
75
W
minimum loss pad. Connect the remaining side of the pad to the
SER B input of the waveform monitor.
b. Terminate the channel B loop-through input with a high-frequency, 75
W
terminator.
c. Connect the Black Burst output from the serial component generator to
the waveform monitor Ext Ref input. See page 5–11 for instructions on
connecting the black burst signal.
d. To load the factory preset, press the PRESET button, use the bezel knob
to pick the FACTORY setting, then press the RECALL bezel button.
e. Select the Eye display mode and the SERIAL B input.
f. Press the waveform monitor REF button and note that EXT indicator
lights.
g. Set the following parameters on the leveled sine wave generator:
Output Head ON
Frequency 4 MHz
Amplitude 1.26 V
h. CHECK– for an amplitude of 800 mV 5% (760 to 840 mV).
22. Eye Bandwidth (WFM 601E, WFM 601M only)
REQUIREMENT – 50 kHz to 450 MHz: –3 dB to +1 dB.
a. Connect the leveling head from the leveled sine wave generator to a
75
W
minimum loss pad. Connect the remaining side of the pad to the
SER B input of the waveform monitor.
b. Terminate the channel B loop-through input with a high-frequency
terminator.
c. To load the factory preset, press the PRESET button, use the bezel knob
to pick the FACTORY setting, then press the RECALL bezel button.
d. Select the Eye display mode and the SERIAL B input.
e. Set the following parameters on the leveled sine wave generator:
Output Head ON
Frequency 10 MHz
Amplitude 632 mV