Keithley 7753 High Volt Source Switch Module

The Keithley 7753 High Voltage Source Switch Module is a specialized instrument module engineered for integration into the Keithley Model 2790 SourceMeter Switch System. It delivers programmable DC voltage sourcing from 50V to 500V with 100mV resolution and current sourcing from 0 to 50mA, paired with multichannel relay switching for precision high-voltage test applications. The module incorporates a built-in I/V converter for insulation resistance measurements, latching electromechanical relays with sub-3ms actuation, and a four-bank switching matrix configured to accommodate single or dual inflator units.

Hardware interlocks, low-energy sources, and programmable shunts provide essential safety redundancy in high-risk test environments.

Technical Specifications

• Voltage Source: 50V to 500V programmable range, 100mV resolution; 0.5% + 0.13V accuracy (2-year specification)


• Current Source: 0–50mA programmable; 0.5% (of reading) + 60nA accuracy; <1mV voltage burden


• Current Measurement Input Range: 0–500µA


• Insulation Resistance Measurement: 1 MΩ minimum measurable ohm level


• Relay Switching: Four banks of two-pole latching electromechanical relays; <3ms actuation time; 10⁶ operations at maximum source level; >10⁸ operations cold switching


• Earth Isolation: 500Vpeak, >10GΩ and <150pF (any terminal to chassis)


• Temperature Coefficient (Current Source): (0.02% + 0.5nA)/°C (0–18°C & 28–40°C)


• Short Circuit Current: V-source: −500µA maximum; I-source: <1mA typical

Key Features

• Programmable high-voltage and low-current sourcing with independent control


• Built-in current-to-voltage converter for efficient insulation resistance testing


• Four-bank relay matrix with integrated HIPOT short for dielectric strength assessment


• Contact verification test simplification through relay topology


• Dual-inflator or single-inflator unit connectivity


• Hardware source interlock and programmable shunt protection

Typical Applications

• Automotive airbag inflator testing and characterization


• Automotive electrical system validation and continuity verification


• Insulation resistance and dielectric strength measurements


• Multi-unit inflator qualification in manufacturing test environments

Compatibility & Integration The 7753 module is engineered exclusively for use with the Keithley Model 2790 SourceMeter Switch System mainframe and integrates into the 2790's test architecture for voltage and current measurement verification.