Sensitive (picoampere range) current amplifier that is intended for voltammetric and amperometric measurements with carbon-fiber microelectrodes

  • Low noise, works in picoampere range
  • Ideally suited for recordings from single cells
  • Can be operated with external waveforms for cyclic voltammetry
  • Telegraph outputs for easy interfacing to data acquisition systems
  • 3-electrode headstage for a floating command potential available
  • Gain settings from 0.5 to 25 mV / pA in six steps
  • Precise built-in voltage source for DC amperometry (+/- 1000 mV standard, +/- 2000 mV optional)


  • Allows simultaneous electrophysiological recordings during voltammetric or amperometric investigations using headstages with differential inputs
  • Can be used in scanning electrochemical microscopy
  • Also suitable for lipid bilayer recordings

Use with 5 µm carbon fiber electrodes also available from npi.

Also available as 19" rackmount device.

Please contact npi electronic for further details.


Part no. Description
VA-10M4 Voltammeter module with 4-pole Bessel filter for recordings with carbon fiber electrodes, width = 1
VA-10M8 Voltammeter module with 8-pole Bessel filter for recordings with carbon fiber electrodes, width = 1
VA-HS3 Differential (3-Electrode) Headstage for VA-10 Amplifier System
VA-HS-MINI VA-10 MiniHeadstage with differential input, with standard cable 2.5m, D=2.3mm, w/o housing
VA-HS4 4-channel Headstage for VA-10 Modular System
VA-CFE Carbon fiber electrodes, 5 µm diameter, using the Anodic Electrophoretic Deposition of Paint (EDP) method
VA-CFE-H-BNC CFE holder for headstages with BNC connector

Technical Data

Input voltage range: ±1200 mV
Operating voltage: ±12 V
Enclosure: Size: 40 x 70 x 20 mm, not grounded
Mounting plate: 50 x 70 mm, not conducting
Electrode connector: BNC with driven shield
Ground connector: 1 mm connector (black)
Driven shield output: 1 mm connector (red)
Input resistance: >1013 Ω
Current range: ±20 nA
Feedback resistor: 500 MΩ

<1 pA

4-pole or 8-pole Bessel FILTER
6 corner frequencies: 100, 300 500, 1k, 3k, 5k Hz.

6-position rotary switch (x0.5, x1, x2.5, x5, x10, x25) mV / pA


COMMAND VOLTAGE set by 10-turn potentiometer, range: (1000 mV, polarity selectable with polarity switch (+, 0, -), display XXXX mV

Impedance: 250 Ω
FILTERED: BNC connector, sensitivity selectable with GAIN switch, FILTERED with LP Bessel FILTER
UNFILTERED: BNC connector, sensitivity selectable with GAIN switch

Resistance: 1 MΩ

INPUT BNC connector, sensitivity: /10, also displayed

Impedance: 250 Ω
GAIN: BNC connector, 1 V per step, +1 V....+7 V
COMMAND: BNC connector, sensitivity: x10

115/230 V AC, 60/50 Hz, fuse 0.4/0.2 A, slow.