Getting Acquain
ted with Your Instrument
Troubleshooting Signal Problems
If you have problems taking measurements, you may receive warning or error messages that can help you determine the
source of the problem. The following tables describe the messages and the possible causes.
Option SD/HD Warning messages
Number Text Possible causes
Operation where it
may occur
1 Acquisition Problem The instrument cannot trigger or the
signal levels are out of range.
All measurements
2 Bar Measurements Inconclusive
The instrument cannot find a proper
sync, the wrong format is selected, or
the signal is distorted.
Measuring Short Time
Distortion
3
Channel Delay: Channel <x> & <y>,
Correlation Too Low
The line number is set incorrectly, a
distorted signal, or an inappropriate
input signal with too few transitions.
Measuring Channel
Delay
4
Channel Delay: Disjoint Correlations
Among Channels...
There is a group delay mismatch
among channels or an inappropriate
signal source.
Measuring Channel
Delay
5
Color Bars: <Color> Bar Not Found
The line number is set incorrectly, a
distorted signal, an incorrect format
is specified, channels connected
are in the wrong order, the wrong
colorimetry, or excessive cropping of
the signal.
Measuring Color Bars
6
Color Bars: Back Porch Reference
Questionable
The signal is distorted.
Measuring Color Bars
7
Frequency Response: Signal
Change: <freq1> ³ <freq2> MHz
Signal level is too low, an incorrect
signal, or a change in the signal.
Measuring Frequency
Response
8 Frequency Response Individual
Channel Errors: Channel <x>
The signal is distorted or a flag is
missing in the signal.
Measuring Frequency
Response
9 Frequency Response: Invalid results
for all channels
The line number is set incorrectly,
an inappropriate input signal, or an
incorrect configuration.
Measuring Frequency
Response
10
Multiburst: Signal Change: <freq1> ³
<freq2> MHz
Signal level is too low, an incorrect
signal, or a change in the signal.
Measuring Multiburst
11
Multiburst: Individual Channel Errors:
Channel <x>: Flag <= 0 mV
The signal is distorted or a flag is
missing in the signal.
Measuring Multiburst
12
Multiburst: Individual Channel Errors:
Channel <x>: burst <n>: not detected
Signal level is too low, distorted
signals, an input signal with less than
six frequency packets, or excessive
cropping of the signal.
Measuring Multiburst
13
Multiburst: Invalid results for all
channels
The line number is set incorrectly,
an inappropriate input signal, or an
incorrect configuration.
Measuring Multiburst
14
Noise: Signal Change: Chan <x>
The signal changed during
measurement.
Measuring Noise
44 VM Series Video Measurement System Quick Start User Manual
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