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 3x3 matrix could be used to connect three sources to three test
points as shown below.
Any one of the signal sources can be connected to any one of the test
inputs. Be aware that with a matrix, it is possible to connect more than
one source at the same time. It is important to make sure that dangerous
or unwanted conditions are not created by these connections.
Form C (SPDT) Switching The HP 34903A Actuator contains
20 Form C switches (also called single-pole, double-throw). You can use
Form C switches to route signals but they are typically used to control
external devices.
Source 2
Test 1 Test 2 Test 3
Source 3
Source 1
NC
COM
NO
NC
COM
Channel Open
(NC Contact Connected)
Channel Closed
(NO Contact Connected)
NO
NO = Normally Open
NC = Normally Closed
3
Chapter 3 System Overview
Signal Routing and Switching
59
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