Keithley 7702 40-Channel Multiplexer Module
Description
The 7702 plug-in module is a switching device with multiple configuration options. It can function as either a 40-channel 2-pole multiplexer or a 20-channel 4-pole multiplexer. This module can be set up as two separate multiplexer banks for added flexibility. Additionally, the 7702 includes two specialized channels with protection features, specifically designed for current measurements. Its capabilities make it particularly well-suited for temperature sensing applications, including those using RTDs, thermistors, and thermocouples.
Key Features
- 40 general-purpose measurement channels
- 2 dedicated current measurement channels
- Supports both two-wire and four-wire measurements
- Large screw terminal blocks for easy connections
- Voltage channels: 300 V, 1 A capacity
- Current channels: 3 A capacity
- 60 W, 125 VA power handling
- Onboard memory storage for relay closure states
Model Overview
| Capabilities | Channels 1-40: Multiplex one of 40 2-pole or one of 20 4-pole signals into DMM Channels 41-42: Multiplex one of 2 2-pole current signals into DMM |
|---|---|
| Maximum Signal Level | Channels (1-40): 300 V DC or rms, 1 A switched, 60 W, 125 VA maximum Channels (41-42): 60 V DC or 30 V rms, 3 A switched, 60 W, 125 VA maximum |
| Contact Life (typ.) | >105 operations at max. signal level >108 operations no load(Minimum signal level 10 mV, 10 μA) |
|---|---|
| Contact Resistance | <1 Ω at end of contact life |
| Contact Potential | <±500 nV typical per contact, 1 μV max <±500 nV typical per contact pair, 1 μV max |
| Offset Current | <100pA |
| Connector Type | Screw terminal, #20 AWG wire size |
| Isolation Between Any Two Terminals | >1010 Ω, <100 pF |
| Isolation Between Any Terminal and Earth | >109 Ω, <200 pF |
| Cross Talk (10 MHz, 50 Ω Load) | <-40 dB |
| Insertion Loss (50 Ω Source, 50 Ω Load) | <0.1 dB below 1 MHz <3 dB below 2 MHz |
| Common Mode Voltage | 300V between any terminal and chassis |
| Shipping weight: | 0.75 Kg |
