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The EmStat Pico is a joint development by PalmSens BV and Analog Devices Inc. PalmSens is known for introducing the first commercially available handheld potentiostat. Over the last decade these have evolved to become smaller and more versatile. Together with Analog Devices, PalmSens now proudly presents the world smallest potentiostat module available on the market.

 

The EmStat Pico module supports the following techniques:

Voltammetric techniques

  • Linear Sweep Voltammetry (LSV)
  • Cyclic Voltammetry (CV)
  • Square Wave Voltammetry (SWV)
  • Differential Pulse Voltammetry (DPV)
  • Normal Pulse Voltammetry (NPV)

The above techniques can also be used for stripping voltammetry

Techniques as a function of time

  • Chronoamperometry (CA)
  • Pulsed Amperometric Detection (PAD)
  • Open Circuit Potentiometry (OCP)
  • Electrochemical Impedance Spectroscopy (EIS)

MethodSCRIPT™ communications protocol

The EmStat Pico potentiostat module works with the new MethodSCRIPT scripting language. This language allows developers to program a human-readable script directly into the Pico module by means of a serial (TTL) connection. The simple script language allows for running electrochemical techniques supported by EmStat Pico and makes it easy to combine different measurements and other tasks.
More script features include:
▪ Use of variables
▪ (Nested) loops
▪ Logging results to an SD card
▪ Digital I/O for example for waiting for an external trigger
▪ Reading auxiliary values like pH or temperature
▪ Going to sleep or hibernate mode 

Use directly with PSTrace for Windows and PStouch for Android

If expanded with USB or Bluetooth communications, the EmStat Pico  can be used directly with our PSTrace software for electrochemistry. PSTrace enables you to find the optimal settings for your experiment and allows you to extract the generated script for the EmStat Pico. This script can be transferred directly into your (embedded) code for controlling the EmStat Pico.

The PStouch app can be downloaded for free from the Google Play store.

 

Main Specifications

The module works at three different modes;
Low Speed mode: for scan rates up to 1 V/s or a bandwidth of 100 Hz.
High Speed mode: for high scan rates and frequencies.
Max Range mode: a combination of the Low and High Speed modes for optimal dynamic dc-potential range.

 

Low Speed mode

High Speed mode

Max Range mode

General
Full dc-potential range -1.2 to +2 V -1.7 to +2 V -1.7 to +2 V
Dynamic dc-potential range [1] 2.2 V 1.2 V 2.6 V
Compliance voltage -2.0 to +2.3 V [2]
Maximum current ± 3 mA
Max. acquisition rate 
(datapoints/s)
100 1000 100
Supports FRA/EIS NO YES NO
Potentiostat (controlled potential mode)
Channels 2 (2x WE, 2x RE and 2x CE)
Applied dc-potential resolution 537 µV 395 µV 932 µV
Applied potential accuracy < 0.2% < 0.5% < 0.5%
Current ranges 100 nA, 2 uA,
4 uA, 8 uA,
16 uA, 32 uA,
63 uA, 125 uA,
250 uA, 500 uA,
1 mA, 5 mA
100 nA, 1 uA,
6 uA, 13 uA,
25 uA, 50 uA,
100 uA,
200 uA, 1 mA,
5 mA
100 nA, 1 uA,
6 uA, 13 uA,
25 uA, 50 uA,
100 uA,
200 uA, 1 mA,
5 mA
Current accuracy < 0.5 % for
current ranges
> 100nA,
< 1% for 100nA current range
< 1% of the selected current range < 1% of the selected current range
Measured current resolution 0.006% of selected current range (5.5 pA on 100 nA range)
Measured potential resolution 56 uV
FRA / EIS (impedance measurements)       
Frequency range 0.016 Hz to 200 kHz
Ac-amplitude range 1 mV to 0.25 V rms, or 0.708 V p-p
Bipotentiostat
Modes 1. WE2 at fixed potential (E offset vs RE1)
2. WE2 scanning (E offset vs WE1)
Max. potential WE2 E(WE1) + E(WE2) < 1.6 V  [3]
Electrometer
Electrometer amplifier input > 1 TΩ // 10 pF
Bandwidth  250 kHz
Communications and peripherals
Module communication UART
Communication with external peripherals SPI and I2C
Analog I/O 3 analog input pins
Digital I/O 7 general-purpose I/O pins
1 wake-up pin
Optional on-board temperature sensor [4] ±0.25 °C
Other
Storage 4000 datapoints on-board (supports optional external SD card for mass storage)
Mounting Surface mounted with castellated pads
Through hole pins (2.54 mm pitch)
Dimensions 30.5 mm X 18 mm X 2.6 mm
Operation temperature range -40°C to +85°C

[1]  The dynamic range is the range that can be covered during a single scan within the full potential range. For example; a linear scan can start at -1.5 V and end at 1.1 V or vice versa, covering 2.6 V dynamic range.
[2] The compliance voltage is the maximum potential between Working and Counter electrode and depends on the selected mode.
[3] If your main WE1 is scanning from -0.5V to +0.5V, the WE2 can only have a maximum offset of 0.6V.
[4] The high accurate on-board temperature sensor is standard available on modules that come with the EmStat Pico Development Kit. For separate EmStat Pico modules the temperature sensor is optional.

Dual-channel and Bipotentiostat functionality

The second channel of the EmStat Pico can be used for running sequential measurements on two different cells each with their own Reference, Counter and Working electrodes.
The second channel can also be used in Bipotentiostat mode, functioning as second Working Electrode versus the Reference and Counter electrode of channel 1. Both channels are recorded simultaneously in the Bipotentiostat mode.

The second Working Electrode (WE2) can either be set at a potential offset with respect to WE1 or at a fixed potential with respect to RE1.

The Bipotentiostat mode is supported in Low Speed mode (see table above) for all techniques, excluding EIS and OCP.