Scanning; Scanning Fundamentals; Channel Assignments; Sequential And Non-Sequential Scans - Keithley 3700 series Reference Manual

Scanning fundamentals

The Series 3700 can scan channels with up to six installed Keithley Instruments switching
modules. Each scan channel can have its own unique setup. Aspects of operation that may be
uniquely set for each channel include function, range, rate, AC bandwidth, REL, filter, digits,
math, offset compensation, temperature transducers, limits, and volts dB.
NOTE

Channel assignments

Each switching module has a certain number of channels. For example, the Model 3720
switching module has 60 channels (1 through 60). When you encounter a 1 to 3-digit channel
number in this manual, the switching module channel is the point of discussion. A four-digit
channel number includes the slot followed by the 3-digit channel number.
A switching module can be installed in any of the mainframe's six slots. Therefore, to close,
open, or scan a channel, it is necessary to specify the slot location and channel number of the
switching module. This is accomplished by using a four-digit channel number for the mainframe.
The first digit (1, 2, 3, 4, 5, or 6) indicates the slot number, and the next three digits indicate one
of the following:




Sequential and non-sequential scans

Scans may be configured and executed from the front panel, remotely over the bus, or through
the Series 3700 web page. In all cases, scans may be sequential or non-sequential. The steps
will be executed in the order they were added. When adding a range of channels, they are
added sequentially.
In this section:
Scanning fundamentals ................................................................................... 7-1
Front panel scanning ....................................................................................... 7-7
Bus operation scanning ................................................................................... 7-10
If desired, readings for scanned channels may be automatically stored in the a reading
buffer (see Buffer (Data Storage and Retrieval)
Retrieval" on page 6-1)).
The channel number of a switching module
The row and column of a matrix card
The modules' backplane relay

Scanning

(see "Buffer: Data Storage and
Section 7