USER’S MANUAL. PROMAX-10
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Figure 14.- V/A and C/N Level
measurement
IMPORTANT
To leave the SCAN operating mode configuration menu, just press the key of the
operating mode you wish to access.
4.2.3 CHANNEL-FREQUENCY operating mode
The CHANNEL-FREQUENCY operating mode provides the following
measurements:
Analogue channels:
- Video carrier level
- Carrier / Noise (C/N) ratio
- Video / Audio (V/A) ratio
- CSO-CTB intermodulation distortion measurement
Digital channels:
- Channel power by measurements integration
- Carrier / Noise (C/N) ratio
- Bit error rate (BER)
- Modulation error ratio (MER)
- Constellation Diagram
To access to this mode of operation, press the CH-FR key [10]. There exist two
tuning modes: by channel or by frequency. When pressing the CH-FR key [10], if the
instrument is in this mode allows the switching from channel tuning to frequency tuning.
4.2.3.1
Channel tuning
4.2.3.1.1
Video c V/A + C/N measurement
If the tuned channel has been defined as
analogue by means of the Edit Channel Plan function
(see section 4.2.1 Global Configuration Menu), the
PROMAX-10
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will display a screen as the
one shown in the attached figure.
The tuned channel (C69 in the figure)
appears in the higher left hand corner; this may be
changed by turning the rotary selector [9]. At its right
appears the frequency (855.25 MHz) and the active channel plan (CCIR in the figure).
Below is shown the video carrier level, VIDEO Carrier (80 dBµV in the
example). The units of measurement may be changed using the Global Configuration
Menu (section 4.2.1). At the bottom, a bar-graph displays the level with a resolution of 1
dB.
Also the ratios between the video and the audio carriers (V/A) and the
video carrier and noise (C/N) are shown. The example in previous figure shows a
channel with a Video/Audio ratio of 16 dB and a C/N ratio of 54 dB.
