The Agilent 42841A is a bias current source, typically used in conjunction with LCR meters such as the Agilent 4284A, 4285A, or E4980A. Below are its main features and parameters:

- Current range: 0.01A to 20.0A.
- Frequency range: When used with instruments like the 4284A, it supports DC bias current measurements up to 40A within the 20Hz to 1MHz frequency range, and up to 10A within the 75kHz to 30MHz frequency range. The basic impedance accuracy is ±1% within the 1kHz to 1MHz frequency range.
- Other features: It includes a 40V DC bias to prevent overheating of the device under test, as well as DC bias voltage monitoring. Additionally, this bias current source features a custom interface that allows direct control via Option 002 of the 4284A or 4285A precision LCR meters.