Keithley 7703 32-Channel High Speed Multiplexer Module
Description
The 7703 is a plug-in module featuring multiplexer capabilities. It provides either 32 channels with 2-pole switching or 16 channels with 4-pole switching, configurable as two separate multiplexer banks. This module employs fast, non-latching reed relays, engineered to handle 300 volts and 500mA, with a 10VA rating. For convenience, relay closure states are stored in the module's built-in memory. With these specifications, the 7703 is particularly well-suited for temperature measurement applications using RTDs and thermistors.
Key Features
- Equipped with 32 multipurpose measurement channels
- Rapid relay switching with sub-millisecond actuation for efficient scanning
- Flexible configuration supporting both two-wire and four-wire measurement techniques
- Features dual 50-pin female D-sub connectors, enabling secure connections and facilitating quick setup and dismantling
Model Overview
| Capabilities | Channels 1-32: Multiplex one of 32 2-pole or one of 16 4-pole signals into DMM |
|---|---|
| Maximum Signal Level | Channels (1–32): 300V DC or rms, 0.5A switched, 10W maximum |
| Contact Life (typ) | >5×104 operations at max. signal level >108 operations cold switching |
|---|---|
| Contact Resistance | <1Ω at end of contact life |
| Contact Potential | <±3µV typical per contact, 6µV max <±3µV typical per contact pair, 6µV max |
| Offset Current | <100pA |
| Connector Type | 50 pin D-sub ×2 |
| Relay Drive Current | 20mA per channel |
| Isolation Between Any Two Terminals | >109 Ω, <200pF |
| Isolation Between Any Terminal and Earth | >109 Ω, <400pF |
| Cross Talk (1 MHz, 50Ω Load) | <–40dB |
| Insertion Loss (50Ω Source, 50Ω Load) | <0.35dB below 1MHz <3dB below 2MHz |
| Common Mode Voltage | 300V between any terminal and chassis |
