Keithley Series 3700 System Switch/Multimeter
4 models with full specifications from Keithley.
The Keithley Series 3700 and 3700A families provide scalable, high-density switching and multi-channel measurement solutions for automated testing and data acquisition. Built around a six-slot mainframe design with an integrated, high-performance 7.5-digit digital multimeter (DMM), these systems allow engineers to route and measure signals within a unified chassis. The platform supports a variety of specialized plug-in cards, enabling users to customize configurations for multiplexer, matrix, or general-purpose switching topologies while maintaining instrument-grade signal integrity.
- Mainframe Slots
- 6 plug-in card slots
- Integrated DMM Resolution
- Up to 7.5 digits (26-bit)
- Maximum Multiplexer Capacity
- Up to 576 2-wire channels
- Supported Interfaces
- GPIB, LAN (LXI), USB 2.0
Models in this series
| Model | Type | Storage Temperature Range | Dimensions (W×H×D) | Operating Altitude |
|---|---|---|---|---|
| 3706 | Multimeters | -25 °C to +65 °C | — | Up to 2000 m |
| 3722 | *misc | -40 °C to 70 °C | 114 mm × 33 mm × 258 mm | Up to 2000 meters |
| 3706A | Multimeters | -40 °C to 70 °C | 483 mm × 89 mm × 457 mm | Up to 2,000 meters (6,561 feet) above sea level |
| 3732 | Relays | -40°C to 70°C | 33 mm x 211 mm x 322 mm | — |
System Switch Mainframes
The foundation of the system is the mainframe, which is available in configurations such as the Keithley 3706 and Keithley 3706A. Both options feature six plug-in card slots to scale up to 576 two-wire channels. They feature an integrated 7.5-digit DMM capable of measuring DC voltage (up to 1000 V), AC voltage (up to 750 V RMS), resistance, current, frequency, period, and temperature via RTDs, thermistors, or thermocouples.
While the Keithley 3706 provides a monochrome graphic vacuum fluorescent display (VFD) and LXI Class C compliance, the Keithley 3706A features a 2-line VFD and expanded connectivity. The Keithley 3706A includes GPIB (IEEE-488.2), LAN (LXI Core 2011), USB 2.0 Device, and USB 2.0 Host interfaces, allowing for versatile integration into automated test stands. Remote command options for these mainframes include SCPI commands, IVI drivers, and Test Script Processor (TSP) scripting for executing complex test sequences directly on the instrument.
Multiplexer and Matrix Cards
To route signals to and from the internal DMM or external instrumentation, the mainframes utilize dedicated plug-in modules that occupy one mainframe slot each.
- Keithley 3722: A high-density dual 1x48 multiplexer card featuring 96 two-pole channels. It uses latching reed relays to enable rapid actuation in high-speed switching applications. The card can be configured as a dual 1x48, a single 1x96, or a 4-pole 1x48 multiplexer. It supports switching up to 200 V DC (141 V AC RMS) and currents up to 1 A.
- Keithley 3732: An ultra-high-density reed matrix card designed for high-point-count applications. It provides 448 single-pole crosspoints and supports multiple dynamic configurations, including quad 4x28, dual 4x56, single 4x112, dual 8x28, or single 8x56. The card switching threshold supports up to 200 V DC or peak AC, with a maximum carry current of 1.2 A and a typical 30 MHz bandwidth (-3 dB).
Frequently asked questions
- What measurement functions are supported by the integrated DMM?
- The integrated 7.5-digit DMM supports DCV, ACV, DCI, ACI, Frequency, Period, 2-wire Ohms, 4-wire Ohms, 3-wire RTD, 4-wire RTD, Thermocouple, Thermistor, and Continuity measurements.
- Can the Keithley 3732 and 3722 cards be used in both the 3706 and 3706A mainframes?
- Yes, both the Keithley 3722 and Keithley 3732 plug-in cards are compatible with the Keithley 3706 and Keithley 3706A mainframes.