R.V.R. Elettronica PTRL-NV/2/S3, Техническое руководство

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R.V.R. ELETTRONICA S.r.l. (BO) Pag. 38
PTRLNV/2/S3 and PTRL-NV/2/HP/S3 - Technical and Maintenance Manual
5.3 CALIBRATION OF THE MODMETER CARD
For this procedure please refer to SETUP 2 (Fig. 5).
1) Connect a 30dB attenuator between R.F. Output connector and FAM
Modulation Analyzer.
2) Connect an audio frequency generator to the MONO or STEREO inputs
set at a frequency of 400 Hz and an amplitude (at the connector)
of -10 dBm (0 dBm for the american version).
3) Set the switch 10%-100% (5 Fig.1) to 100%.
4) Verufy 100KHz value on the FAM Modulation Analizer.
5) Adjust trimmer R30 on the Modmeter card until the 1st red led comes
on (corresponding to the 100% level).
6) Set the switch 10%-100% (4 Fig.1) to 10%.
7) Inject a 400 Hz signal into the input connector at a level of
-30 dBm for european versions or -20dBm for american versions.
8) Adjust trimmer R4 on the Modmeter card until the 1st red led comes
on (corresponding to a level of 10%).
5.4 CALIBRATION OF THE MAIN CARD
Having fitted the Main card and made all necessary connections,
carry out the following procedure (see SETUP 2 / Fig.5):
1) Connect an audio frequency generator to the MONO or STEREO inputs.
2) Connect a 30dB attenuator between the R.F. Ouput Connector and FAM
Modualtion Analyzer.
SETUP 2 / FIG. 5