The 40A SpikeSafe Source Measure Unit is a High Current Source Measure Unit. Output pulses have nanosecond rise and fall times – key to precise and repeatable LED, LIDAR, VCSEL photometric and electrical measurements. This SMU supplies precision DC, continuous pulse, and single pulse current with excellent pulse fidelity. A precision hardware-controlled timing system ensures measurement repeatability with synchronization of source, measure and external instrumentation. Continuous power conversion means no duty cycle or pulse width limitations.
The SpikeSafe High Current SMU features a low noise, true differential digitizer optimized for component testing. This digitizer can sample device Vf at 500ksps and pick up millivolt changes in voltage that occur during pulsed operation. This sensitivity supports the most accurate IES LM-85 and CIE 225 measurements.
Devices being tested are protected with a gentle turn-on during ramp-up and with SpikeSafe load protection during operation. SpikeSafe load protection continuously monitors voltage and current patterns and instantly shuts down the drive current when device anomalies are detected.
The notable specifications for this current source are as follows: the low range output current accuracy is 0.4%+1.4mA. The high range output current accuracy is 0.08%+8mA. The pulse width range is 10µs-15000s and the pulse width accuracy is 1.3µs. The pulse rise/fall time is 350ns-4.5µs and the typical pulse width jitter is 30ns.
40A Source Pulse Shapes
Precision pulsing is key to best practices test and measurement. The 40A SpikeSafe Source Measure Unit offers programmable pulse width flexibility. It is capable of long pulse widths (ms to seconds) and short pulse widths (100us pulse widths and faster). With the pulse source, minimum 10us pulse widths are possible. Pulse width accuracy is 1.3us with pulse rise and fall times of 350ns to 4.5us. Ramp time is adjustable. Programmable load tuning alters the 40A SpikeSafe Source Measure Unit current regulator response to compensate for load conditions, cable impedance, and length.