User`s guide

ManualsBrandsAgilent Technologies ManualsSwitch34980A

Multiple multiplexers can connect

to the built-in analog buses, allowing you

to scan up to 560 2-wire channels or 640

1-wire channels in a single mainframe. The

34921A also offers 4 channels for directly

measuring current. Or if you need more cur-

rent channels, shunts can be added to the

terminal block for easy current measure-

ments.

The multiplexer modules feature break-

before-make connections to ensure that no

two signals are connected to each other

during a scan. Or, if you prefer, you can

control switching manually to create your

own switch configuration. All the multiplex-

er switches have a relay counter to help

predict when relays need to be replaced.

Note:The34923Aand34924Ahave100

ohm input protection resistors that limit

current and protect the reed relays.

001

002

003

004

005

HD LD

COM 1

Bank 1

HD LD

006

007

008

009

000

HD LD

011

012

013

014

015

HD LD

016

017

018

019

020

HD LD

914

HD LD

913

HD LD

912

HD LD

911

ABus3 ABus4

ABus1

DMM

(MEAS)

ABus2

DMM

(SENS)

Analog buses

100 Ω

100

Ω 100 Ω

Figure 6. 34925A 40/80-channel optically isolated FET mux (shown in 1-wire mode bank 2)

Figure 5. 34923A 40-channel reed multiplexer (bank 1 shown)