The output current is then dictated by the compliance voltage level and the impedance of the load. Our PLD current limit design has a 0.2V hysteresis built in to reduce the chance of fast modulation current changes exceeding the limit current setting. This hysteresis also means that the limit is triggered 0.2V before the limit current trimpot setting. Power supply noise most commonly causes the SET T to appear to fluctuate. Measuring SET T while referencing the multi-meter to the power supply ground instead of the monitor ground in the unit can also cause variation.
Ground connections carrying high levels of current make poor reference points.
Compliance Voltage is a current source specification. Once a current source output voltage reaches the compliance voltage level, the current source no longer regulates its output current. The output current is then dictated by the compliance voltage level and the impedance of the load. The temperature sensor and the level of voltage developed across this sensor during operation. Check your sensor bonding.