The Kepco series BOP Bipolar Power Supplies are fully dissipative, linear stabilizers for laboratory and systems applications. The BOP is an all solid-state design, featuring IC operational amplifiers in the control circuit section and silicon power transistors mounted on special fan-cooled heat sinks in the complementary power stage. 1-5 The BOP has two bipolar control channels (voltage or current mode), selectable and individually controllable either from their front panel controls, or by remote signals. Each of the principal control channels is protected by bipolar limit circuits. In these limit circuits the positive and negative current or voltage limit points can be manually set or remotely programmed simultaneously or individually. Automatic crossover between each principal control channel and its associated limit channel is provided. 1-6 All control and limit channels are connected to the complementary output stage via an ‘‘EXCLUSIVE OR" gate, so that only one channel is in control of the BOP output at any one time. The BOP output can be programmed over its full output range by a ± 10 volt signal applied to either one of the inputs to the voltage or the current channel. The limit control channels can be remotely controlled by a 0 to +10 volt signal applied to their respective inputs. Two uncommitted preamplifiers, with both, inverting and noninverting inputs available at the rear programming connector, can scale any programming source to the required input levels. Zero adjustments for both amplifiers are provided. 1-7 The BOP is a fast programmable power supply with considerable bandwidth and thereby sensitive to reactive loads. The dynamic specifications, given in Table 1-3, are valid for resistive loads only.