Keithley 3721
| Attribute | Value |
|---|---|
| Card Type | Dual 1×20 Multiplexer Card |
| Compatible Mainframe | Keithley 3706A System Switch/Multimeter |
| Number of Channels | 40 channels (two banks of 20 channels each) |
| Maximum Voltage | 300V DC or RMS |
| Maximum Current | 1A per channel |
| Contact Resistance | <1Ω initial |
| Relay Type | Electromechanical relays |
| Relay Life | 100,000 operations (typical) |
| Connector Type | Screw terminal connections via mass interconnect |
| Operating Temperature | 0°C to 50°C |
Keithley 3721 Options:
- 3721 - 3721-MTC-1.5 - 50 Pin D-sub Female to Male Cable, 1.5m (5 ft.)
- 3721 - 3721-MTC-3 - 50 Pin D-sub Female to Male Cable, 3m (10 ft.)
- 3721 - 3721-ST - Screw Terminal Block (required for auto CJC thermocouple measurements)
- 3721 - 3790-KIT50-R - 50 Pin Female D-sub Connector Kit (contains 2 female D-sub connectors and 100 solder-cup contacts)
- 3721 - 7401 - Type K Thermocouple Wire (100 ft.)
- 3721 - 3721-3Y-EW-STD - 1-year factory warranty extended to 3 years from date of shipment
- 3721 - 3721-5Y-EW-STD - 1-year factory warranty extended to 5 years from date of shipment
- 3721 - C/3721-3Y-STD - 3 (Z540-1 compliant) calibrations within 3 years of purchase
| Model | 3721 |
|---|
The Keithley 3721 multiplexer card features two independent banks of 1x20 two-pole multiplexers, ideal for general-purpose switching and temperature measurement applications. These banks connect via analogue backplane relays to the 3700A series mainframe, allowing reconfiguration as a 1x40 multiplexer or for extended setups. It includes 40-channel four-wire ohms input, fused channels for current measurements, and supports cold junction compensation with the 3721-ST accessory.
Its dual-bank structure, latching electromechanical relays, and dedicated 4-wire inputs make it suitable for precise automated test environments and expanded measurement configurations.
Testwall can supply the used Keithley 3721, fully tested. With expert support and global delivery, Testwall ensures high-performance instrumentation with unmatched reliability and service quality. Please contact us directly if you need calibration or repair of the Keithley 3721.
