RJM ARTS-201B, Руководство пользователя

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13
2. Video.
2. Video. 2. Video.
2. Video.
Terminate the primary and backup input loops and output #2 with precision 75
Ω
terminations.
2.1
Connect a one volt peak-to-peak staircase signal to the ‘A’ input. Operate the
front push-button to ensure that the ‘A’ green status LED is illuminated. Connect
output #1 to the oscilloscope and terminate in 75
Ω
.
2.2
Adjust A GAIN (R71
R71 R71
R71) for one volt peak-to-peak at the output. Check with the
vectorscope that the output differential phase is less than
±
0.1
°
and that the
differential gain is less than
±
0.1%. Move the output cable to output #2 and
confirm the same results.
2.3
Connect the sweep generator to the ‘A’ primary input. Adjust the sweep for 30
MHz bandwidth and 100mV level. Set R137
R137 R137 R137 to the mechanical center of its
range.
2.4
Adjust C70
C70 C70
C70 for the best response out to 30 MHz. It may be necessary to adjust
R137 R137 R137 R137 for optimum results. Confirm that the response conforms to the
specifications listed in section II.
2.5
Connect the sweep generator to the primary input through the 100 meter reel of
coax cable.
2.6
View the response and adjust A GAIN (R71
R71 R71
R71) for the correct level and EQ (R6
R6 R6
R6) for
the flattest response. It may be necessary to adjust C70 C70 C70 C70. Confirm that the
response conforms to the specifications listed in section II.
2.7
Remove the 100 meter cable, turn EQ fully counter-clockwise, and adjust the
output level to one volt peak-to-peak.
2.8
Repeat 2.1 through 2.7 with input signals applied to the ‘B’ input and with the ‘B’
green status LED illuminated.