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 provides 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
Current Sourcing
• 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.
