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 provides 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

Switching Architecture:
• 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.