The Measurement Instruments Model 3250 Variable-Resistance-Load (VRL) System is a simple, easy-to-use, commercial-off-the-shelf (COTS), self-contained variable-resistance electrical load – manually controlled with an adjustment knob on the front panel. The Model 3250 VRL is often used to control outgoing or incoming AC or DC electrical current to a unit under test (UUT).
The Model 3250 VRL is housed in a heavy gauge steel enclosure, vented to allow removal of generated heat. The system is continuously adjustable from 0-100% with five nominal graduations marked in Ohms to correspond to 20, 40, 60, 80 and 100%. Table 1 below shows standard part-numbers, ratings and dimensions for a wide range of Model 3250 VRL’s. Other ratings are available upon request. Please contact Measurement Instruments at 724-459-8090 or .