SM25-1 Interface Technology Source-Measure Module

The Interface Technology SM25 Source-Measure Module is a Dual-Channel Source-Measure instrument designed with high throughput in mind. Packaged in a single-wide VXI C-size module, the SM25 is a register-based instrument capable of making single-point measurements in 1 ms simultaneously on each channel. Or, using the internal comparator, the SM25 can perform simple pass/fail tests at comparable speeds. To further improve test speeds, range settings can be changed 100 times per second (10 ms) and settings within the same range at 1000 per second (1 ms). Intelligent placement of the two-channel's control registers allow both on-board instruments to be programmed using a single VXI register write.

The SM25 is a fully programmable instrument, capable of sourcing and measuring voltage or current simultaneously on both channels. The SM25 is actually four instruments per channel. Each channel can: source voltage, measure voltage, source current and measure current.

The SM25 can source and measure voltages from 20 μV to 25 V in three ranges, and can source and measure current from 50 pA to 1000 mA in seven ranges. Both the source voltage and the source current settle to specified accuracy in as little as 150 μs, typically. To extend the capabilities further, the SM25 uses floating grounds so that multiple channels may be connected in parallel for higher current or, optionally, in series for increased voltage. To facilitate integrating the SM25 with other test instruments, the SM25 can accept and source triggers on the VXI backplane, allowing host-free sequencing of complex test scenarios. Also, each channel provides an isolation relay to isolate the SM25 from the Device Under Test (DUT) while other instruments are actively driving the DUT. Selectable integration and the averaging of multiple measurements enhance sensitivity for critical applications.

Other features include programmable delay and fast integrating measurements, four operating modes: DC/Fixed/Sweep/Append, storage for 8,190 readings in internal memory, 255 state memory for to sequencing through stored settings, 0.1% basic accuracy, four-wire Kelvin connections with driven guard, and four quadrant source operation.