DC isolating amplifier to electrically insulate i/p & o/p signals at2.3KV &power supply at3.7KV or amplify the signal levels in 252 i/p [0..1000V, ±20mA, ±20V] o/p [±20mA, ±10V] combination selected by soldered jumpers, R Load Max600 OHM Accuracy±0.2%