Keithley 7710 20-Channel Solid State Multiplexer Module
Description
The 7710 is an advanced plug-in module featuring a versatile relay input system. It offers a configurable setup of either 20 channels with 2-pole switching or 10 channels with 4-pole switching, which can be arranged as two separate multiplexer banks. A key feature of this module is its use of solid-state relays, which significantly enhance its durability and reduce maintenance needs. These solid-state components typically offer a lifespan about 100 times longer than traditional mechanical relays.
This module is particularly well-suited for two main application areas:
- Long-term data logging projects
- Demanding high-speed testing scenarios
Notable characteristics of the 7710 include:
- 20 channels designed for diverse measurement applications
- Impressive scanning capabilities, reaching speeds of up to 500 channels per second
- Suitability for high-speed production or Automated Test Equipment (ATE) testing, maintaining its 500 channels/second performance
- Extended operational life due to solid-state relay technology
- User-friendly removable screw terminals, facilitating quick and straightforward connections
Model Overview
| Capabilities (Channels 1–20) | Multiplex one of 20 2-pole or one of 10 4-pole signals into DMM |
|---|---|
| Maximum Signal Level | Any channel to any channel (1–20): 60VDC or 42V rms, 100mA switched, 6W, 4.2VA maximum |
| Common Mode Voltage | 300VDC or 300Vrms (425V peak) maximum between any terminal and chassis |
|---|---|
| Relay Life (typ) | >105 operational hours max. signal level or 1010 operations (guaranteed by design) |
| Relay Drive Current | 6mA per channel continuous, 25mA during initial pulse |
| Channel Resistance (per conductor) | <5Ω |
| Contact Potential | <1µV per pair |
| Offset Current | <3nA @ 23°C (per channel); additional 0.13nA/°C >23°C |
| Connector Type | 3.5mm removable screw terminals, #20 AWG wire size |
| Isolation Between Any Two Terminals | >109 Ω, <100pF |
| Isolation Between Any Terminal and Earth | >109 Ω, <100pF |
| Crosstalk (CH-CH, 300kHz, 50Ω Load) | <–40dB |
| Insertion Loss (50Ω Source, 50Ω Load) | <0.5dB below 100kHz, <3dB below 2MHz |
| Temperature Accuracy Using Internal CJC | 1°C for K type (see mainframe specifications for details) |
