5-18 Rel, Math, Ratio, Channel Average, dB Model 2750 Multimeter/Switch System User’s Manual
Scanning
Ratio and channel average can be used in an advanced scan. The 2-channel scan for the
calculation is performed for every primary channel that is scanned. For example, assume
the Model 7700 is installed in slot 1 and is configured to perform the ratio calculation for
10 channels. When channel 101 is scanned, measurements are performed on channels 101
and on its paired channel (111). The calculation is performed and the result is displayed.
When the next channel (102) is scanned, measurements are performed on that channel
(102) and on its paired channel (112). The calculation is performed and the result is dis-
played. This process continues for each scanned channel.
When an advanced scan is configured, each channel can have its own unique setup. That
is, one or more channels can use ratio, and other channel(s) can use channel average.
Details to configure and run a scan are provided in Section 7.
Advanced scan configuration notes:
1. When a calculation (ratio or channel average) is enabled for a primary scan chan-
nel, the following setup actions occur:
a. The calculation enables for the paired channel.
b. The primary channel setup (function, range, rel, etc.) will be copied to the
paired channel.
2. The filter setup for both scan channels are controlled by the primary channel.
3. After the calculation is enabled, the range setting can be independently set for both
the primary and paired channel.
4. Before the calculation is enabled, rel can be independently set for both the primary
and paired channel. In general, set up rel from the normal measurement state, then
go into the advanced menu and enable rel for the primary and/or paired channel.
See “Relative,” page 5-2, for details on setting rel for scan channels.
5. Settings such as NPLC, aperture, bandwidth, OCOMP, etc., are ignored on the
paired channel. These settings are controlled by the primary channel.
6. For remote programming, the <clist> parameter is used to configure channels for a
scan (Table 5-3).
2750-900-01.book Page 18 Wednesday, August 3, 2011 7:56 AM
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