The VA-10X is a sensitive (picoampere range) current amplifier that is intended for voltammetric measurements. It can be used with carbon-fiber microelectrodes in biological systems, where the total currents do not exceed a few tens of nA, or with other electrode types. The current range can be customised with different feedback resistors, also a switchable headstage is available for higher flexibility during experiments.
Besides the current range, also filter frequencies, gain stages or headstages can be customised. If you require a special design, please let us know.
It was designed at the Max-Planck-Institute for Experimental Medicine in Göttingen as an economically priced alternative to do-it-yourself systems and expensive commercial systems.
It can be used for either DC amperometry using the built-in voltage source, or it can be operated with user-supplied external voltage waveforms (e.g. for cyclic voltammetry).
The VA-10X-8 is equipped with high performance 8-pole Bessel filters.
The device can be widely customised Ask npi electronic for headstages with different feedback resistors, multi electrode headstages, or miniaturised headstages for in-vivo recordings.
Optionally, the VA-10X can be equipped with a frequency booster in order to enhance the recording bandwidth to several kHz.
The device can be adapted to directly replace the discontinued Dagan Chem-Clamp.
The VA-10 is also available as module for the EPMS-07 system.
| HEADSTAGE | Input voltage range: ±1200 mV Operating voltage: ±12 V Enclosure: Size: 40 x 70 x 20 mm, driven shield (COMMAND potential) Mounting plate: 50 x 70 mm, not conducting Electrode connector:driven shield (COMMAND potential) 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 (other values on request) |
| OUTPUTS | Impedance: 250 Ω FILTERED: BNC connector, sensitivity selectable with GAIN switch, FILTERED with LP Bessel FILTER UNFILTERED: BNC connector, sensitivity selectable with GAIN switch |
| INPUTS | Resistance: 1 MΩ |
| VOLTAGE SOURCE | COMMAND VOLTAGE set by 10-turn potentiometer, range: (1000 mV, polarity selectable with polarity switch (+, 0, -), display XXXX mV COMMAND VOLTAGE: INPUT BNC connector, sensitivity: /10, also displayed |
| LP FILTER | 8-pole Bessel FILTER 16 corner frequencies: 20, 50, 100, 200, 300 500, 700, 1k, 1.3k, 2k, 3k, 5k, 8k, 10k, 13k, 20k Hz. (other values on request) |
| NOISE | <1 pA |
| GAIN | 7-position rotary switch (x0.5, x1, x2.5, x5, x10, x25, x50 mV / pA) (other values on request) |
| POWER REQUIREMENTS | 115/230 V AC, 60/50 Hz, fuse 0.4/0.2 A, slow. |
| DIMENSIONS | 19″ rackmount cabinet, 19″ (483 mm), 10″ (250 mm), 3.5″ (88 mm) |
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