System Switch/Multimeter User's Manual Section 4:
Closing and Opening Switching Module Channels
-900-01 Rev. A / August 2007 4-
Enclose the contents of the channel list in either single (') or double (") quotes, but the
quote style must match.
Use a comma or semicolon to separate the channel list or channel patterns.
The string may contain a single channel, channel pattern or analog backplane relay as
well as multiple ones that are indicated by a range or comma separated.
Use a colon to specify a range of channels. Example:
channel.getbackplane("1001:1003") responds with the range of Slot 1 channels from 1 to
3.
Although a parameter string may be valid, the command that calls it will determine the string's
ultimate validity. For example, only channels have a pole setting (channel patterns do not). If a
channel pattern is passed to the poles setting command, an error would be generated.
Channel patterns may be included as a <ch_list> parameter.
<ch_list> queries
For queries that return a channel list parameter, a channel configured for 4-pole operations will
indicate the paired channel in parenthesis. For example, Channel 3003 on a 60-channel card is
configured for 4-pole, then sending:
channel.close('3003')
print(channel.getclose('slot3') 3003(3033)
NOTE In the above examples output the paired channel associated with 3003 is 3033 and
is in included in parenthesis.
Channel operation
The channel number is displayed on the Series 3700's front panel. For a 4-wire function (in other
words, Ω4), the paired channel is internally connected to DMM sense, but not displayed. When
triggered, the DMM performs a measurement and displays it on the Series 3700.
When a measurement channel is closed (measurement channel meaning that a function other
than 'no function' is associated with the channel), the input backplane isolation channel also
closes to connect the channel to DMM input. For a 4-wire function, the paired channel and the
sense backplane isolation channel also close to make the sense connections to the DMM.
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