10 | Keysight | 34980A Multifunction Switch/Measure Unit - Data Sheet
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 current channels,
shunts can be added to the terminal block for easy current measurements.
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 conꢁguration. All the multiplexer 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.
Figure 5. 34923A 40-channel reed multiplexer (bank 1 shown)
Figure 6. 34925A 40/80-channel optically isolated FET mux (shown in 1-wire mode bank 2)
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