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4 points of pilot subcarriers will be displayed. Viewing of the constellation diagram allows
to determine distortion behavior in the channel.
MER, preBER and postBER measurement values are displayed in positions 5, 6 and 7.
With
,
, ◄, and ► keys you can select the quadrant to be zoomed for better
resolution. Choosing with the arrow (position 2) and activate the zoom view mode by
pressing the F3 button. Press F3 button once again to return to full view mode.
Press
key to return to MER/BER measurement mode (Section 4.3.6).
AMP power supply, is controlled by pressing the
4.3.8 AMP Power Control
The AMP power supply is used to line power mast and distribution amplifiers, etc.
directly and autonomously from your DAT103. This simplifies testing of an antenna with a
preamplifier in line, to locate the best available signal in a deep fringe or poor signal area.
Current is supplied to the devices via the input F-connector. AMP power supply mode
provides voltage, status information and control. Press the
a measurement mode, in the process of creating a channel plan or a data logger page.
The screen view is shown in figure 4.3.14.
The following data is shown on the screen:
1 – Voltage, values: off, 12V, or 24V.
2 – Voltage measures the value of the voltage delivered to your AMP. If the connected
cable already carries power, the warning: Vext will appear on the screen.
3 – Current measures the current being drawn by your AMP. If the current exceeds the
3 watt limit, an: Overload warning will appear on screen.
4 – command line is activated by F1 and F3 keys.
12V or 24V DC can be selected by pressing ◄ or ► keys, and then F1/Apply.
Voltage and current measurements will show on screen. Press F3/Exit to exit the sub-
menu.
AMP power operates only in measurement modes. In all service modes AMP power
is off.
The Analyzer checks the input connector for presence of voltage before supplying
AMP power. If voltage is present the power supply will not turn on. When the power
supply is on, the Analyzer monitors the load current, switching supply off if the current
exceeds the allowed level. The Analyzer will make these checks and attempt to turn the
power supply on every 3 seconds.
AMP power supply status in measurement modes is indicated in the upper right-hand
corner of the screen.
key briefly (section 4.3.8).
Figure 4.3.14
key briefly to access, whilst in
17
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