Lab power supplies from Rohde & Schwarz add control/logging functions

September 19, 2014 // By Graham Prophet
Tracking, sequencing, and FuseLink are additional functionality included in the HMC804x power supplies. Data logging and an integrated energy meter are further features that are included, in a price range below €1000.

Developed by Rohde & Schwarz subsidiary Hameg Instruments they are equipped with one (HMC8041), two (HMC8042) or three (HMC8043) channels. All models from this series deliver up to 100W and are adjustable between 0 and 32V in steps of 1 mV.

Tracking is available in the two multichannel models and enables combined parallel or serial operation. It is still possible to provide power to several circuits independently. Changes to current and voltage values are carried out synchronously in combined channels.

FuseLink is based on a similar idea. This function combines the safety switch off current limits for multiple channels. If a channel exceeds its limit, the combined channels also shut off. The function is especially useful if two circuits with different voltages connected to a power supply require overload protection, while at the same time a third circuit needs to continue operating, for example for a fan to provide interruption-free cooling.

The sequencing function makes it possible to switch on multiple channels sequentially over a period of up to 10 seconds. The switch-on times for the individual channels can be set with up to 1 msec resolution.

The logging function stores all current, voltage and time values. The energy meter function continuously displays the power in watts drawn by a connected load.

Other functions include EasyRamp and Arbitrary. EasyRamp is used to simulate startup curves for a set output voltage. The ramp can be set within a time window of 10 seconds with a resolution of 10 msec. The Arbitrary function makes it possible to program user-defined current and voltage (V/I) curves. The relevant inputs can be made manually or by remote control. Up to 512 points and up to 255 repetitions can be defined.

Rohde & Schwarz;