Tektronix WFM 601A, Руководство по обслуживанию

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Performance Verification
WFM 601A, WFM 601E, & WFM 601M Service Manual
4–13
q. Select the LPASS filter.
r. Remeasure the square pulse amplitude with the Cursors by repeating
steps m through p.
s. CHECK – that the LPASS voltage is within 1% ( 7 mV for a
700 mV signal) of the FLAT filter voltage reading.
10. Frequency Response On Screen
REQUIREMENT – Luminance (Y) to 5.0 MHz 2%.
Chrominance (P
b
and P
r
) to 2.5 MHz 2%
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. Select the 100% Sweep signal on the TG2000.
c. Select the following on the waveform monitor:
PARADE display mode, CH 1, CH 2, CH 3 on, and One Line Sweep
(5
m
s/div).
d. CHECK – that all three channel waveforms are within 2%, 14 mV.
11. Monitor Out Gain Accuracy (WFM 601M only)
REQUIREMENT – Active Video Gain: 700 mV 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. Set the serial component generator output to the 100% Color Bars signal:
Modules DVG1
Signal Sets 525–270
Test Signals Color Bars
Color Bars 100% Color Bars
c. Connect the output from the MON OUT Y/G connector to the CH A
input on the 1780/81 R.
d. Connect the black burst output from the digital component signal
generator to the waveform monitor EXT REF loop-through input.
e. Connect the other EXT REF loop-through connector to the 1780/81R Ext
Ref input.