Promax MC-377+, Инструкция по эксплуатации

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INSTRUCTION MANUAL MC-377+.
Page 19
May 2001
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4.2 Using the level meter
4.2.1 Start-up
Press the I/O control [3]. The frequency counter display [22] will show the tuned
frequency in MHz, except when the instrument is in MAX bandwidth spectrum analyser
mode (SPAN/MAX key [6])
4.2.2 Preliminary adjustments
Connect the antenna signal to one of the inputs, TV [21] or SAT [19], depending on
the band you wish to analyse: VLO/VHI/UHF or SAT.
If necessary, power the external units (aerial pre-amplifiers or LNB) using switch
VDC [13] (0/13/18 V) and activate the 22 kHz commutation signal placing the 22 kHz
switch [12] in the ON position. When activating the external unit voltage supply, make
sure that the DRAIN luminous indicator [20] remains lit and that the SHORT indicator
[18] stays off.
Using the MON./SPEC key [5], select the Monitor or Spectrum Analyser mode.
You are recommended to first select the complete band Spectrum Analyser mode
(SPAN/MAX key [6] released) to view all the signals present on the band at the same
time.
Adjust the brightness and contrast of the CRT screen with the [28] and [29]
controls.
Select the desired frequency band with the VLO [7], VHI [8], UHF [9] and SAT [10]
keys.
Tune to the desired frequency using the TUNING [24] and FINE TUNING [26]
controls, the latter enables a more accurate tuning to be performed, especially in the
UHF band. In the event of the frequency counter display [22] not showing anything,
press the SPAN/MAX key [6] and adjust the represented bandwidth using the SPAN
control [23].
If necessary, use the 10 dB [14], 20 dB [15] and 20 dB keys [16] to select the
appropriate attenuation.
Adjust the volume with the control [27] or, if you wish, release the control in
order to select the acoustic level signal, this will help you to search for the maximum
signal level without having to continually watch the measurement screen.