Keithley 2790 User Manual

Model 2790 SourceMeter
®
Switch System User’s Manual 5-31
Test procedure
The basic test procedure for using memory patterns to perform contact tests on a dual-state
inflator using scanning is shown in Table 5-7. The same test procedure using individual
memory pattern location recall is shown in Table 5-8.
This procedure sets up three memory locations for the necessary relay closures. Each
memory location is set up as follows:
• Delay: 0s
• Function: 2-wire ohms
• Range: 100
• Integration period: 1 PLC
After setting up memory locations (Table 5-7), the scan is enabled, triggered, and readings
are stored in the buffer for recall once the scan is complete. For the memory pattern loca-
tion recall shown in Table 5-8, memory locations are first set up, and each location is
recalled in succession.
Table 5-7
Command sequence for memory patterns test example using scanning
Command Sequence Description
*RST Restore GPIB defaults.
ROUT:MEM:CLE:ALL Clear all memory pattern locations.
Set up memory location 1:
ROUT:MEM:CHAN 1,(@101,114,118) Set channels 1, 14, and 18 for memory location 1.
ROUT:MEM:DEL 1,0 Set delay to 0.
ROUT:MEM:READ:STAT 1, ON Enable reading.
SENS:FUNC 'RES',(@M1) Select 2-wire ohms.
SENS:RES:RANG 100,(@M1) Select 100Ω range.
SENS:RES:NPLC 1,(@M1) Select 1 PLC.
Set up memory location 2:
ROUT:MEM:CHAN 2,(@104,114,118) Set channels 4, 14, and 18 for memory location 2.
ROUT:MEM:DEL 2,0 Set delay to 0.
ROUT:MEM:READ:STAT 2, ON Enable reading.
SENS:FUNC 'RES',(@M2) Select 2-wire ohms.
SENS:RES:RANG 100,(@M2) Select 100Ω range.
SENS:RES:NPLC 1,(@M2) Select 1 PLC.

Keithley 2790 Specifications

General

Brand	Keithley
Model	2790
Category	Switch
Language	English

Summary

Test System Overview

Inflator Tests

Explains the basic tests for inflators: shunt bar, bridgewire, and insulation resistance.

Keithley 7702 Switching Module

Safety Precautions

Follow safety guidelines for using the 7702 module with other modules.

Switching Module Wiring and Installation

Connections and Wiring

Switching Module Installation

Instructions on how to install 7751, 7752, 7753, or 7702 modules into the Model 2790 mainframe.

Inflator Testing

Shunt Bar Test

Details the test circuit and procedure for measuring shunt bar resistance.

Bridgewire Tests

Details the test circuit and procedure for measuring bridgewire resistance.

Insulation Resistance (HIPOT) Tests

Covers measuring inflator insulation resistance, including cable discharge and contact checks.

Model 2790 DMM Ohms Functions

Low Ohms Measurements

4-Wire Ohms

Explains the benefits of the 4-wire ohms technique for measuring low resistance.

Specifications

Models 2790/7751/7752/7753 Specifications

Complete instrument specifications for the Model 2790 and its modules.

Model 7702 Specifications

Complete specifications for the Keithley 7702 module.