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Chapter 4 Measurements
Digital Channels - If the selected channel is a digital carrier, the display
shows the digital QAM carrier level (no video or audio carrier). In addition, the MER (modulation error ratio), Pre-FEC BER, Post-FEC BER
and elapsed time for the measurements are displayed on the CM1000.
BER measurements are cumulative over the elapsed time indicated
and can be reset by pressing the F3 key. A small “lock” symbol next to
the battery state icon indicates when a digital signal is locked so that
MER and BER measurements can be made. The elapsed time and
modulation type are also displayed. Use the F3 Reset key to reset the
BER measurements and elapsed time.
CH/FREQ – Shifts the current tuning method from CH to Frequency
and vise-versa. The cursor shifts between the Channel and Frequency
displayed.
Constellation – Provides direct access to the Constellation, Equalizer,
Frequency Response and STATS modes from SLM mode. The initial
display is the Constellation. See the Constellation section at the end
of the SLM section.
Reset – Re-locks to the digital signal and resets the BER measurements to zero. The Elapsed time counter is reset to match the duration
of the measurement.
More – Displays a new set of function keys: 2 CH, 5 CH, SCAN and
MORE.
2 CH - 2 CH mode provides the ability to view two channels simultaneously and compare their signal level. SCAN – See the following section
on SCAN for the operation of the F2 SCAN function key.
5 CH Mode - The five channel mode displays the five favorite channels’
level and the Tilt between the first and last.
SCAN – See the following section on SCAN for the operation of the
F2 SCAN function key.
More – Displays a new set of function keys: CH/Freq, Ref Lvl and
More.
Ref Lvl - The vertical scale of the graphic display is calibrated in dBmV or
dBuV and is auto-ranging, depending on the level measured. Manually
adjust the vertical scale by pressing the F3 Ref Lvl (Reference Level)
function key and using the arrow keys to scroll the scale up or down.
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