Clear plastic cover is provided for safe measurements Opening the cover decreases the voltage generated by back-e.m.f. (electromotive force) to a level below 40 V within 0.1 second Heat-sensitive switch prevents DUT from overheating Also equipped with DC bias voltage monitoring The Keysight Agilent HP 42841A Bias Current Source is an accessory of the Keysight Agilent HP 4284A and Keysight Agilent HP 4285A Precision LCR Meters. The Bias current output at 23 ±5º C is 0.01 to 20.0 A. The Basic impedance accuracy is 1% over the frequency range 1 kHz to 1 MHz. The unit has a custom interface which is directly controllable be the Option 002 of the Keysight Agilent HP 4284A and Keysight Agilent HP 4285A Precision LCR Meters.