Keysight 34921A User Manual

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Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 29Low Frequency Multiplexer ModulesTwo-Wire ModeYou may configure the 34923A as:- two independent 20-channel 2-wire MUXes. This configuration requiresneither the use of external wiring nor connection through the internal AnalogBuses.- one 40-channel, 2-wire MUX. For this configuration, you must use externalwiring or connect through the internal Analog Buses.In 2-wire mode, you can close no more than 20 channels simultaneously due topower dissipation. Note that there are two 20 channel banks in 2-wire mode.Each 20 channel bank is further divided into two 10 channel sub-banks in thecontrol circuitry. These 20 channels are split 10 to a bank. However, note thatAnalog Bus relays count half as much as channel relays in that total. Forexample, with one Analog Bus relay closed, you can close up to a maximum of 19channel relays. If you try to close more than the allowed number of channels, youwill receive an error message.Four-Wire ModeYou may configure the 34923A as a 20-channel 4-wire MUX. This configurationrequires neither external wiring nor connection through the Analog Buses.For 4-wire resistance measurements, the instrument automatically pairs channeln on Bank 1 (source) with channel n+20 on Bank 2 (sense) to provide theseconnections. Four-wire controls occur only when doing 4-wire measurementoperations through the internal DMM, such as MEASure:FRESistance? orscanning a channel previously configured as 4-wire.One-Wire ModeYou may configure the 34923A as:- two independent 40-channel 1-wire MUXes. This configuration requiresneither external wiring nor connection through the internal Analog Buses.- one 80-channel 1-wire MUX. You must use external wiring or connect throughthe internal Analog Bus for this configuration.In 1-wire mode, you can close no more than 40 channels simultaneously due topower dissipation. Note that there are two 40 channel banks in 1-wire mode.Each 40 channel bank is further divided into two 20 channel sub-banks in thecontrol circuitry. These channels are split 20 to a bank. For example, with oneBecause all bank relays supply only HI signals, you canapply a LOW signal through COM1 L or COM2 L when youare making 2-wire resistance measurements in 1-wiremode.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com