Keithley 7701 Differential Multiplexer Module

The Keithley 7701 Differential Multiplexer Module is a high-density switching matrix designed for integration with Keithley data acquisition systems (Models 2700, 2701, and 2750). It has 32 channels of 2-pole switching, configurable as either a single 1×32 differential multiplexer or two independent 1×16 differential multiplexers. The module supports 4-wire resistance measurements up to 16 channels and common-side 4-wire ohms configurations across all 32 channels, making it suitable for temperature measurement, resistance testing, and general-purpose voltage applications in automated test equipment and laboratory environments.

Technical Specifications

• 32 channels of 2-pole switching


• Dual configuration modes: single 1×32 or dual 1×16 differential multiplexers


• Up to 16 channels of 4-pole switching for 4-wire ohms measurements


• 32 channels available for common-side 4-wire ohms configuration Electrical Performance:


• Maximum signal level (any channel to any channel): 150 V DC, 150 V RMS (212 V peak AC)


• Maximum switched current: 1 A


• Maximum power dissipation: 60 W


• Maximum VA: 125 VA


• Contact potential: <6 µV per contact pair


• Contact resistance: <1 Ω per path


• Offset current: 10¹⁰ Ω, 10⁹ Ω, 10⁹ Ω, <400 pF


• Common mode voltage: 300 V DC or 300 V RMS (425 V peak AC) to chassis


• Insertion loss: <0.35 dB below 1 MHz, <3 dB below 2 MHz (50 Ω source/load)


• Crosstalk (1 MHz, 50 Ω load): <–35 dB


• Minimum signal level: 10 mV, 10 µA Relay Specifications:


• Type: Latching electromechanical


• Actuation time: 10⁵ operations at maximum signal level; >10⁸ operations no load


• Relay closure state stored in onboard memory Connectors:


• Two female D-shell connectors (50-pin for channels 1–24 and Multiplexer 1; 25-pin for channels 25–32 and Multiplexer 2)


• Supplied with 50-pin and 25-pin D-Sub male IDC connector kits


• User-configurable screw terminals with jumpers for DMM connections Physical:


• Weight: <0.52 kg (1.16 lb)

Key Features

• Latching relay design with stored closure states - no power required to maintain configuration


• Low contact potential (10⁹–10¹⁰ Ω) supports precision analog and low-level measurements


• Broad voltage/current range accommodates AC waveforms up to 425 V peak


• Multiple connector options and user-configurable terminals enable flexible test setup integration

Typical Applications

• Temperature measurement via RTD or thermistor switching


• General-purpose voltage and resistance testing


• Multi-channel signal routing in automated test systems


• High-accuracy 4-wire resistance measurements


• Complex laboratory data acquisition configurations

Compatibility & Integration Direct integration with Keithley Models 2700, 2701, and 2750 data acquisition and measurement systems. Compatible with standard D-shell connector interfaces; supplied connector kits enable rapid deployment.