The HP 4140B pA Meter/DC Voltage Source provides a stable picoampere meter with a maximum resolution of 10-15 A, and two programmable dc voltage sources. This, along with the programmable hold and step delay function, lets you make synchronized measurements on a device or on material.
 

•     Stable, high resolution current measurements: 0.001 x 10-12 A to 1.999 x 10-2 A, accuracy 0.5%, 3.5  digit display
•     Calculated capacitance range: 0.1 pF to 1999 pF (in two ranges)
•     Measurement times: ~4 ms to 2.56 s
•     Zero offset
•     Trigger: INT, EXT, HOLD/MAN
•     Input terminal: Triaxial
•     Measurement functions: I-V, C-V, I
•     Voltage source output range: ±100 in 10 mV steps, ramp rate 0.001 V/s to 1.000 V/s
•     Selectable integration times - short, medium, or long
•     Line filter
•     Automatic or manual ranging
•     Self test
•     Analog output for plotting I-V, C-V data
•     Selectable source current limit
•     Voltage sweep functions: AUTO/START, MAN (PAUSE), STEP, ABORT
•     Quasi-Static C-V measurements
•     HP-IB interface: SH1, AH1, T5, L4, SR1, RL1, DC1, DT1
•     Manual or programmable parameter selection and data entry