Keithley 7751 500V Source/Switch Card

The Keithley 7751 is a high-voltage Source/Switch Module engineered for the Keithley 2790 SourceMeter Switch System. It delivers programmable DC voltage sourcing from 50V to 500V with 100mV resolution and concurrent multi-channel relay switching. The module combines voltage and current sourcing with a built-in current-to-voltage converter for precision insulation resistance and continuity measurements. Primary applications include automotive component testing, airbag inflator validation, and bridgewire resistance characterization.

Technical Specifications Voltage Source

Programmable range: 50V to 500V, 100mV resolution

Accuracy: 0.5% + 0.13V (2-year)

Temperature coefficient: 0.03%/°C (0–18°C, 28–40°C) for 10MΩ range; 0.05%/°C for 100MΩ; 0.12%/°C for 1GΩ

Maximum output current: 50µA at rated accuracy

Typical short-circuit current: <1mA

Rise time: 250ms (50V to 500V), 1000ms (500V to 50V) to 0.1% of final value Current Source

Programmable range: 0mA to 50mA, 10µA resolution

Output voltage compliance: 5.5V ±10%

Accuracy: 0.06% + 10µA (2-year)

Settling time: 1ms typical to 0.1% of final value

Temperature coefficient: (0.001% + 0.25µA)/°C (0–18°C, 28–40°C) Current Measurement (I/V Converter)

Measurement range: 0µA to 50µA

Accuracy: 0.5% (of reading) + 5nA to 6nA (2-year)

Voltage burden: <1mV

Minimum resistance measurement: 10MΩ at rated accuracy Relay Switching

Configuration: 4 Form A channels or 4 sets of 4-pole or 8 sets of 2-pole signals

Type: Latching electromechanical

Actuation time: 10⁶ operations typical

Key Features

Four relay banks enable single or dual inflator unit interfacing

Low-current measurement capability down to nanoampere levels

Fast relay switching with <3ms actuation

High impedance testing suited for insulation and continuity validation

Typical Applications

Automotive airbag inflator electrical testing

Bridgewire and shunt bar resistance measurement

High-voltage insulation resistance characterization

Conductor continuity verification

Compatibility & Integration Exclusively designed for integration with the Keithley 2790 SourceMeter Switch System mainframe.