Home » Keithley » Keithley 3720 Dual 1x30 Multiplexer Card, 60 Channel, 300V, 2A Max, 1A Switched, For 3700/A Series
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SKU: 19173.1 | MPN: 3720
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Keithley 3720 Dual 1x30 Multiplexer Card, 60 Channel, 300V, 2A Max, 1A Switched, For 3700/A Series

£2,050.00
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Manufacturers lead time applies

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Keithley

Keithley is a world-leading manufacturer of precision electrical test and measurement equipment, specialising in solutions for semiconductor testing, materials research and electronic characterisation. Its portfolio includes source measurement units (SMUs), digital multimeters, electrometers, picoammeters, data acquisition systems and switching solutions. Trusted by engineers, scientists and researchers worldwide, Keithley instruments deliver exceptional accuracy for low-level measurements and advanced electrical testing applications.

Keithley 3720 Dual 1 x 30 Multiplexer Card – 60-Channel General Purpose Switching Module for Series 3700A

Buy the Keithley 3720 Multiplexer Card from TestEquity – Your Authorized Tektronix/Keithley Distributor

Product Overview

The Keithley 3720 Dual 1 x 30 Multiplexer Card is a high-performance plug-in module designed for the Series 3700A System Switch/Multimeter mainframe. Offering 60 differential channels (or 30 four-pole channels), this versatile multiplexer card is engineered for general-purpose switching applications, including precision temperature measurements with thermocouple support.

Key Features & Benefits

  • 60 Two-Pole Channels or 30 Four-Pole Channels for flexible general-purpose switching configurations
  • Automatic Cold Junction Compensation (CJC) for accurate thermocouple temperature measurements when paired with the 3720-ST accessory
  • Analog Backplane Connection Relays enable seamless bank-to-bank and card-to-card interconnections
  • 300V, 1A Switched / 2A Carry Signal Capacity (60W, 125VA) for demanding test applications
  • Latching Electromechanical Relays with relay closures stored in onboard memory for reliable operation
  • 30 MHz Bandwidth (Dual 1 x 30 configuration) for high-frequency signal switching
  • Screw Terminal Connections available with the removable 3720-ST accessory
  • Two 78-Pin Male D-Sub Connectors for secure, high-density signal connections

Technical Specifications

Specification Value
Multiplexer Configuration Two independent 1 x 30 2-pole multiplexers
Channel Count 60 channels (2-pole) or 30 channels (4-pole)
Maximum Signal Level 300V DC/RMS, 1A switched, 2A carry, 60W, 125VA
Common Mode Voltage 300V DC/RMS between terminal and chassis
Contact Configuration 2-pole Form A
Channel Resistance <1.0Ω (Dual 1 x 30), <1.5Ω (Single 1 x 60)
Contact Potential <±1μV (Dual), <±3μV (Single)
Offset Current <±250 pA
Bandwidth 30 MHz (Dual 1 x 30), 10 MHz (Single 1 x 60)
Actuation Time 4 ms
Contact Life >10⁵ operations at max signal; >10⁸ operations no load
Connector Type Two 78-pin male D-sub connectors
Operating Temperature 0°C to 50°C
Storage Temperature -25°C to 65°C
Weight 2.5 lbs (1.13 kg)

Scanning Performance

  • Switch Only: >120 channels/second (sequential scanning)
  • DCV or 2W Ohms: >110 channels/second
  • Thermocouple: >110 channels/second
  • 3- or 4-Wire RTD: >100 channels/second
  • 4-Wire Ohms: >100 channels/second

Ideal Applications

The Keithley 3720 multiplexer card is ideal for:

  • Temperature Monitoring & Data Acquisition – Multi-point thermocouple measurements with automatic CJC
  • Automated Test Equipment (ATE) – High-channel-count switching for production test systems
  • Environmental Stress Screening (ESS) – Multi-channel temperature and voltage monitoring
  • R&D Laboratory Testing – General-purpose signal routing and measurement applications
  • Manufacturing Test Systems – Component and PCB testing with flexible channel configurations

System Compatibility

The 3720 card is designed for use with the Keithley/Tektronix Series 3700A System Switch/Multimeter mainframes, including:

  • Model 3706A-S (6-slot mainframe)
  • Model 3706A-SNFP (6-slot, no front panel)
  • Earlier 3700 Series mainframes

Flexible Configuration Options

The Model 3720 offers exceptional flexibility through its dual-bank architecture:

  • Operate as two independent 1 x 30 multiplexers for isolated measurements
  • Reconfigure as a single 1 x 60 two-pole multiplexer via backplane relays
  • Enable card-to-card expansion for larger system configurations
  • Convert to coordinated four-pole operation for enhanced measurement accuracy

Available Accessories

  • 3720-ST – Screw Terminal Block with CJC sensor (required for thermocouple measurements)
  • 3720-MTC-1.5 – 78-Pin D-sub Female to Male Cable, 1.5m (5 ft.)
  • 3720-MTC-3 – 78-Pin D-sub Female to Male Cable, 3m (10 ft.)
  • 3791-KIT78-R – 78-Pin Female D-sub Connector Kit
  • 3791-CIT – Contact Insertion and Extraction Tool

Extended Warranty & Calibration Services

  • 3720-3Y-EW-STD – Extend 1-year factory warranty to 3 years
  • 3720-5Y-EW-STD – Extend 1-year factory warranty to 5 years
  • C/3720-3Y-STD – 3 Z540-1 compliant calibrations within 3 years

Order the Keithley 3720 Dual 1 x 30 Multiplexer Card today and optimize your multi-channel switching and data acquisition applications.