The Agilent HP 44421A is a 20-Channel Guarded Relay Multiplexer Terminal Block. The 44421A assembly uses reed relays to multiplex signals to the DVM or other instruments. Each assembly switches 20 channels, and each channel consists of Hi, Lo, and Guard lines. Two channels may be closed per assembly and relays may be closed in a random sequence or incremented between programmable limits. The low thermal offset of the relays make it suitable for measuring the outputs of strain gage and other transducers. Each channel can be configured with a filter or current shunt for additional flexibility.
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