Chapter 8
Measure Mode – Basic Tab
Level
DSAM Help User Guide
Rev. 001
151
DQI
A real-time measurement that detects intermittent impairments within
a downstream digital QAM carrier.
Return Loopback
The Return Loopback mode enables you to quickly perform frequency
response measurements of active or passive field devices using a
single meter. A CW signal may be generated from the DSAM unit and
injected to the input of a device under test. The DSAM can then
measure the output, providing valuable information such as gain, loss,
roll-off, or frequency response.
Level
A Level measurement views and analyzes the signal level of each
carrier within a channel (as defined by the active channel plan).
You can tune level measurements by frequency or channel.
Frequency Tuning measures signal levels at one specific frequency
and signal levels can be measured at any discrete frequency within the
tuning range. Channel Tuning measures the signal levels of carriers
within a channel and carrier levels can be checked in relation to user-
configured limit sets. In each tuning mode, level measurements are
continuously updated on the screen.
When necessary, you can troubleshoot an installation by performing
this test at various locations to determine which components require
repair or replacement. You can store test results for later reference.
Frequency Tuning
With Frequency Tuning, the signal level is displayed on a graph and
as a numeric value. You use the alphanumeric keypad to tune directly
to a frequency.
21128026 R001 DSAM Help User Guide.book Page 151 Thursday, February 5, 2009 2:02 PM
