Keithley 7752 Low Voltage Current Source Only Source/Switch Module

The Keithley 7752 is a low-voltage current source and switching module engineered for the Model 2790 SourceMeter Switch System. It delivers programmable current sourcing from 0 mA to 50 mA with 0.5% accuracy plus 5 nA offset, alongside multichannel relay switching for automotive electrical test applications. The module sources current only

It has no high-voltage output or I/V conversion capability.

Four relay banks support flexible channel configuration: 4 channels of 4-pole signals or 8 channels of 2-pole signals. Each relay actuates in less than 3 ms and maintains contact resistance below 1 Ohm at end of life. A dry-circuit clamp limits test voltage to 20 mV, preventing oxide layer damage during low-energy measurements.

The integrated DMM measures current to 50 µA with sub-1 mV voltage burden and performs 4-wire contact verification. Latching electromechanical relays deliver over 10⁶ operations at full source level and over 10⁸ cold-switching cycles. Designed exclusively for integration with the Model 2790 host system via plugable screw terminals rated for #22 AWG wire.

Technical Specifications

• Output range: 0 mA to 50 mA


• Accuracy: 0.5% (of reading) + 5 nA (2-year specification)


• Maximum rated current: 50 µA


• Short-circuit current: < 1 mA typical


• Impedance-limited maximum: 1 mA


• Dry-circuit clamp: 20 mV test voltage limit Current Measurement


• Range: 0 µA to 50 µA via internal DMM


• Accuracy: 0.5% (of reading) + 5 nA (2-year specification)


• Voltage burden: < 1 mV Switching


• Configuration: 1 Form A per channel bank; four 2-pole relay banks


• Channel modes: 4 × 4-pole or 8 × 2-pole signals


• Relay type: Latching electromechanical


• Actuation time: 10⁶ operations (maximum source); > 10⁸ operations (cold switching)


• Contact resistance: < 1 Ohm at end of life


• Contact check: 4-wire via internal DMM Voltage Rating


• Maximum between any terminal and chassis: 42 V

Key Features

• Current-source-only architecture with no voltage or I/V converter output


• Dry-circuit safe operation at 20 mV test voltage


• Multichannel relay switching with sub-3 ms actuation


• 4-wire contact verification and integrated current measurement


• Configurable channel banks for mixed signal requirements


• Extended relay life under both maximum-level and cold-switching conditions

Typical Applications

• Airbag inflator resistance and continuity testing


• Low-voltage automotive electrical component validation


• Resistance measurement in high-reliability circuit paths

Compatibility & Integration Exclusive compatibility with the Keithley Model 2790 SourceMeter Switch System. Module interfaces via plugable screw terminals rated for #22 AWG conductors.