Performance Verification
1710J-Series Waveform Monitors
6–15
The requirements are
H
Response at 3.58 MHz (4.43 MHz for PAL) does not vary between FLAT
and CHROMA by more than 1%
H
Attenuation at 7.2 MHz (8.9 MHz for PAL) is greater than 20 dB
1. Use a 75
W
coaxial cable to connect the leveled sine wave generator output
to the 1710J-Series Waveform Monitor CH B input. Terminate the remaining
side of the loop-through input with a 75
W
end-line terminator.
2. Display the signal in FLAT with the 2 LINE sweep and EXT REF.
3. Set the leveled sine wave generator frequency to 3.58 MHz (NTSC) or
4.43 MHz (PAL) and adjust the amplitude for 100 IRE (NTSC) or 700 mV
(PAL).
4. Switch the FILTER to CHROMA
5. Check that the amplitude of the largest chrominance bar is 99 to 101% of the
amplitude in step 3.
6. Select FLAT filter.
7. Set the leveled sine wave generator frequency to 50 kHz. Adjust the
amplitude so that the display is 100 IRE (NTSC) or 700 mV (PAL).
8. Set the frequency of the leveled sine wave generator to 7.2 MHz (NTSC) or
8.9 MHz (PAL).
9. Select CHROMA filter.
10. Check that less than 10% of the reference amplitude remains.
11. Move A3J500 to the (2–3) ON position.
The requirement is return loss of at least 40 dB from 50 kHz to 6 MHz (instru-
ment on or off, any deflection factor setting).
NOTE
. The Return Loss Check needs to be done only if repairs have been made
on the Input circuitry.
1. Connect a precision 50
W
cable from the spectrum analyzer RF Input to the
RF Output on the RF bridge. See Figure 6–5.
2. Connect a precision 50
W
cable from the spectrum analyzer TG Output to the
RF Input on the RF bridge.
Check Chrominance Filter
Response
Check Return Loss
Содержание 1710J Series
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