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The Keithley 2790 SourceMeter Airbag Test System is a multichannel resistance measurement platform built around a mainframe that accepts plug-in source/switch modules. The datasheet describes it as a single-instrument solution that combines high-voltage sourcing, low-current sourcing, measurement, and signal routing required to measure insulation resistance and conductor continuity. The mainframe includes a 6½-digit DMM and supports GPIB, RS-232, and digital I/O for control and automation.
The 2790 is designed for automotive airbag inflator and module electrical functional tests, seatbelt pre-tensioner actuator and module functional electrical checks, high-speed parallel-soak and dual-inflator or dual-station electrical checks, pinched-wire and high-voltage insulation resistance testing in automotive seats and avionics, multipin connector and harness continuity and leakage resistance measurements, multicontact and switch dry circuit continuity and leakage tests, automotive power/fuse center continuity and leakage resistance characterization, and PCB/PWB and general-purpose short/open circuit testing. These are the applications named in the datasheet itself.
Keithley Instruments, founded in 1946 in Cleveland, Ohio, was acquired by Danaher Corporation in 2010, joining Tektronix in Danaher's test and measurement portfolio. In 2016 Danaher spun off its industrial businesses as Fortive Corporation, and Keithley and Tektronix both moved to Fortive, where they continue to share distribution and service infrastructure as sister brands.
The 2790 SourceMeter Airbag Test System is sold as a family of mainframe-plus-module configurations rather than a single fixed product. The mainframe and built-in 6½-digit DMM are common across the family; what varies between the published configurations is which plug-in source/switch modules ship installed and which resistance ranges and source types those modules support. Choosing the right configuration starts with the device under test and the resistance ranges that need to be covered.
The datasheet defines five mainframe configurations (2790-A, 2790-H, 2790-HH, 2790-HL, and 2790-L) plus an optional 7702 40-channel multiplexer module that any of the configurations except the -HH and -HL can host. Each configuration is built around the 7751 high-voltage source/switch module, the 7752 low-voltage current-source-only module, or the 7753 1 MΩ high-voltage source/switch module, in single- or dual-module combinations.
Each new 2790 configuration below links to its own product page with condition-matched pricing. Confirm the specific plug-in modules and the resistance ranges your test station needs before ordering, since the configuration suffix (-A, -H, -HH, -HL, or -L) determines which source/switch cards are installed.
The primary axis of difference across the family is high-voltage versus low-current sourcing and single- versus dual-module capacity. The 2790-H is a single-module system for both low-current and high-voltage ohms covering 10 MΩ to 1 GΩ; the 2790-A is similar but extends high-voltage ohms measurements down to 1 MΩ. The 2790-HH adds a second module so two inflators can be tested simultaneously for parallel soak or dual-station throughput, while the 2790-HL keeps two modules but segregates high-voltage sourcing into one and low-current sourcing into the other, which the datasheet describes for combination testing of assemblies such as safety steering wheels or seats that mix inflators with switches and other devices. The 2790-L is the low-voltage source/ohms-only configuration intended for continuity testing of side/seat airbags and seatbelt pre-tensioners where high-voltage insulation resistance testing is not required.
The comparison table below summarizes the plug-in module loadout and the resistance range coverage for each configuration. For multi-pin connector and harness work, the table also notes which configurations accept the 7702 40-channel multiplexer for channel expansion.
| Model | Configuration | Modules Included | High Voltage Ohms Range |
|---|---|---|---|
| 2790-HL | Two-module | One high voltage + one low voltage module | 10 MΩ to 1 GΩ |
| 2790-A | Single-module | One module (1MΩ high voltage) | 1 MΩ to 1 GΩ |
| 2790-H | Single-module | One module (high voltage) | 10 MΩ to 1 GΩ |
| 2790-HH | Two-module | Two high voltage modules | 10 MΩ to 1 GΩ |
Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.
| Specification | Value |
|---|---|
| 2790 Resistance Mode Specifications with Cards (Module accuracy: 2 years, 23°C, ±5°C) | |
| Source Current 50 mA / Max Resistance 20 Ω / Open Circuit Voltage | 5.5 V; Accuracy (4W) ±(0.09% + 2 mΩ); Temp Coeff ±(0.002% + 3 mΩ)/°C |
| Source Current 20 mA / Max Resistance 50 Ω | 5.5 V; Accuracy ±(0.11% + 5 mΩ); Temp Coeff ±(0.003% + 3 mΩ)/°C |
| Source Current 10 mA / Max Resistance 100 Ω | 5.5 V; Accuracy ±(0.16% + 10 mΩ); Temp Coeff ±(0.004% + 3 mΩ)/°C |
| Dry Circuit Ohms 1 mA / Max Resistance 10 Ω | 20 mV; Accuracy ±(1.10% + 50 mΩ); Temp Coeff ±(0.026% + 3 mΩ)/°C |
| 7751 High Voltage Source Resistance Specifications | |
| 500 V / 10 MΩ | Max Short Circuit Current <1 mA; Accuracy ±0.8%; Temp Coeff ±0.03%/°C |
| 500 V / 100 MΩ | <1 mA; ±1.1%; ±0.05%/°C |
| 500 V / 1 GΩ | <1 mA; ±4.0%; ±0.12%/°C |
| 50 V / 1 MΩ | <1 mA; ±1.1%; ±0.04%/°C |
| 50 V / 10 MΩ | <1 mA; ±1.1%; ±0.06%/°C |
| 50 V / 100 MΩ | <1 mA; ±1.6%; ±0.13%/°C |
| 7753 High Voltage Source Resistance Specifications | |
| 500 V / 1 MΩ | <1 mA; ±0.8%; ±0.02%/°C |
| 500 V / 10 MΩ | <1 mA; ±0.9%; ±0.03%/°C |
| 500 V / 100 MΩ | <1 mA; ±1.3%; ±0.10%/°C |
| 500 V / 1 GΩ | <1 mA; ±6.7%; ±0.27%/°C |
| 50 V / 0.1 MΩ | <1 mA; ±1.1%; ±0.03%/°C |
| 50 V / 1 MΩ | <1 mA; ±1.1%; ±0.04%/°C |
| 50 V / 10 MΩ | <1 mA; ±1.3%; ±0.11%/°C |
| 50 V / 100 MΩ | <1 mA; ±4.5%; ±0.30%/°C |
| Current Source Output | |
| Output Level | Programmable 0 to 50 mA (Ch. 27) |
| Programming Resolution | 10 µA |
| Output Voltage | 5.5 V ±10% compliance |
| Accuracy (2 year) | ±(0.06% + 10 µA) |
| Settling Time | 1 ms to 0.1% of final value (typ.) |
| Temperature Coefficient (0–18°C & 28–40°C) | ±(0.001% + 0.25 µA)/°C |
| Dry Circuit Clamp (Ch. 24) | 20 mV ±10%, Isource ≤1 mA |
| Voltage Source Output (7751/7753 Only) | |
| Output Level | Programmable 50 V to 500 V (Ch. 28) |
| Programming Resolution | 100 mV |
| Output Current (7751) | 50 µA maximum for rated accuracy, <1 mA typical into short circuit |
| Output Current (7753) | 500 µA maximum for rated accuracy, <1 mA typical into short circuit |
| Accuracy (2 year) | ±(0.5% + 0.13 V) |
| Settling Time (Rise) | 50 V to 500 V step, 0.1% of final value, 250 ms max |
| Settling Time (Fall) | 500 V to 50 V step, 0.1% of final value, 1000 ms max |
| Temperature Coefficient (0–18°C & 28–40°C) | ±(0.001% + 0.005 V)/°C |
| Safety Limit | Current limited maximum current of 1 mA |
| Cable Discharge (Ch. 20) | 100 kΩ shunt |
| Maximum Capacitance | 1 nF |
| Current Measure Input (7751/7753 Only) | |
| Range (7751) | 0–50 µA |
| Range (7753) | 0–500 µA |
| Accuracy (7751, 2 year) | ±(0.5% of reading + 6 nA) |
| Accuracy (7753, 2 year) | ±(0.5% of reading + 60 nA) |
| Temperature Coefficient (0–18°C & 28–40°C) | ±(0.02% + 0.5 nA)/°C |
| Voltage Burden | <1 mV |
| Switching Capabilities (Bank 1–Bank 4) | |
| 4 Channels | 1 Form A switch |
| 8 Channels | Four 4-pole or eight 2-pole signals into DMM or I/V converter |
| Contact Check | 4-wire contact check through internal DMM |
| Relay Type | Latching electromechanical |
| Actuation Time | <3 ms |
| Contact Life (typical) | >10⁶ operations at maximum source level; >10⁸ operations cold switching |
| Contact Resistance | <1 Ω at end of contact life |
| Contact Potential | <±2 µV typical per contact pair, ±3 µV max |
| Connector Type | Pluggable screw terminal, #22 AWG wire size |
| Isolation Between Any Two Terminals | >1 GΩ, <100 pF |
| Isolation Between Terminals and Earth | >1 GΩ, <200 pF |
| Isolation Between Channel Groups | >500 GΩ, <100 pF |
| External Common Mode Voltage | 42 V between any terminal and chassis (connect no external sources) |
| System Throughput | |
| High Ohms (0.01 NPLC, Filter Off, GPIB) | 13 rdgs/s |
| Low Ohms (0.01 NPLC, Filter Off, GPIB) | 9 rdgs/s |
| High Ohms (1 NPLC, Filter On, GPIB) | 11 rdgs/s |
| Low Ohms (1 NPLC, Filter On, GPIB) | 7 rdgs/s |
| Basic Airbag Test Sequence Throughput (Body Pin + Bridgewire Continuity + Shorting Clip + Insulation Resistance) | |
| Scan (sequential) memory patterns, single/dual stage DUT | 0.55 / 0.97 seconds |
| Recall (random access) memory patterns, single/dual stage DUT | 1.0 / 2.0 seconds |
| Discrete control w/GPIB I/O, single/dual stage DUT | 1.1 / 1.7 seconds |
| DMM Measurement Ranges (Built-in DMM) | |
| DC Voltage | 0.1 µV to 1000 V |
| AC Voltage | 0.1 µV to 750 V |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
Keithley
Condition
New
Manufacturer
Keithley
30+ Years in Business
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