Multiplexer switching
Multiplexers allow you to connect one of multiple channels to a common channel, one at a time. A simple
4-to-1 multiplexer is shown below. When you combine a multiplexer with a measurement device, like the
internal DMM, you create a scanner. For more information on scanning, see "Scanning".
Multiplexers are available in several types:
Multiplexer type Common use
One-wire (single-ended) For common LO measurements. For more information, see
"One-Wire (Single-Ended) Mul-
tiplexers"
.
Two-wire For floating measurements. For more information, see
"Two-Wire Multiplexers"
.
Four-wire For resistance and RTD measurements. For more information, see
"Four-Wire
Multiplexers"
.
RF Signal Very High Frequency (VHF) for switching frequencies up to 2.8 GHz. For more information, see
"RF Signal Multiplexing"
.
Matrix switching
A matrix switch connects multiple inputs to multiple outputs and therefore offers more switching flexibility
than a multiplexer. Use a matrix for switching low-frequency (less than 10 MHz) signals only. A matrix is
arranged in rows and columns. For example, a simple 3×3 matrix could be used to connect three sources to
three test points as shown below:
Keysight DAQ970A User's Guide 57
3 Features and Functions
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