The Keithly Model 228 is a precision programmable source with the capacity to sink or source up to 100 watts. It has six ranges accurately regulate a constant voltage or a constant current as determined by the load. And because it is two programmable sources in one, you get the flexibility for a broader range of test setups, without having to buy separate sources.
4Quadrant Operation. The 228 is capable of bipolar source or sink up to a full 100 watts without derating in the sink quadrants, permitting it to act as a voltage or current supply or as an active Fast Response. load. Operating status is continuously shown on front panel LEDs.
The 228's modulation input allows voltage programming. Dc to 600Hz inputs can be used to vary the output within the full scale range of the source, simulate variable load conditions in sink, provide a power boost, or test power supply rejection.
Load transient recovery time is less than 1 ms, without troublesome overshoot or oscillation.
Voltage and Current Monitor. The actual output voltage and current are continuously monitored and displayed on the front panel. These values can also be read back over the IEEE-488 bus, eliminating the need for separate measurement instruments in many situations.Switch-selectable remote sensing assures the full rated voltage accuracy at the device under test, even when delivering