EmStat4M Module

Tested & calibrated potentiostat module

  • Desktop performance in the palm of your hand
  • Enables rapid prototyping
  • Easy to reproduce measurements using MethodSCRIPT™
  • Many code examples for different languages and platforms
Electrochemical Impedance Spectroscopy (EIS) is an electrochemical technique to measure the impedance of a system in dependence of the AC potentials frequency. With this option you can select the maximum AC frequency for EIS.
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The EmStat4M is a potentiostat/galvanostat module supporting all common electrochemical techniques, including Electrochemical Impedance Spectroscopy (EIS). The EmStat4M can be evaluated with our PSTrace software for Windows. You can write your own applications for the EmStat4M module using our .NET libraries or MethodSCRIPT™ and control it from any platform or operating system.


The EmStat4M comes in two different versions:

  • Low Range (LR): current range from 1 nA to 10 mA (max. 30 mA)
  • High Range (HR): current ranges from 100 nA to 100 mA (max. 200 mA)

Both versions can be configured with optional EIS/FRA with a maximum frequency of 200 kHz.
See specifications for more information.

Onboard storage

Every EmStat4M is equipped with an internal storage of 500 MB, equivalent to 15 million data points.
This means all your measurements can automatically be saved onboard as a backup.


Start developing with the EmStat4M

The EmStat4M module can be ordered as a bare module or as part of a kit. We offer a Starter Kit and Development Kit as well. The Starter Kit includes a sensor cable, software, and more. The Development Kit comes with the EmStat4M module mounted on a development board. The development board features a Bluetooth module, Li-Ion battery charging, and options for making external connections to an Arduino for example. See the table below for an overview of what is included in both kits. 


  Module only Starter Kit Development Kit
EmStat4M LR or HR module
Development Board
USB-C cable
USB-C splitter cable for extra power (EmStat4M HR only)
Sensor cable (1 meter with 2 mm pins)
4 or 5 croc clips
Dummy Cell
PSTrace software for Windows (on USB drive)
Quick Start document
Calibration report



Voltammetric techniques

  • Linear Sweep Voltammetry (LSV)
  • Cyclic Voltammetry (CV)
  • Fast cyclic Voltammery (FCV)*
  • AC Voltammetry (ACV)*

Amperometric techniques

  • Chronoamperometry (CA)
  • Zero Resistance Amperometry (ZRA)
  • Chronocoulometry (CC)
  • MultiStep Amperometry (MA)
  • Fast Amperometry (FAM)*
  • Pulsed Amperometric Detection (PAD)
  • Multiple-Pulse Amperometric Detection (MPAD)*

Galvanostatic techniques

  • Linear Sweep Potentiometry (LSP)
  • Chronopotentiometry (CP)
  • MultiStep Potentiometry (MP)
  • Open Circuit Potentiometry (OCP)
  • Stripping Chronopotentiometry (SCP or PSA)*

Pulsed techniques

  • Differential Pulse Voltammetry (DPV)
  • Square Wave Voltammetry (SWV)
  • Normal Pulse Voltammetry (NPV)


  • Mixed Mode (MM)*
  • Potentiostatic/Galvanostatic Impedance spectroscopy (EIS / GEIS*)
    • Potential scan or current scan
    • Fixed potential or fixed current
    • Time scan
Stripping modes
The voltametric and pulsed techniques can all be used in their stripping modes which are applied for (ultra-) trace analysis.
Software update
Techniques marked with an asterisk* will become available with the next software update.
Missing a technique? See cross-reference list


The EmStat4M is available in two versions: LR (Low Range) and HR (High Range). 

Main differences between the EmStat4M Low and High Range
  EmStat4M LR potentiostat module EmStat4M HR potentiostat module
Potential range ±3 V ±6 V
Max. compliance voltage ±5 V ±8 V
Current ranges 1 nA to 10 mA (8 ranges) 100 nA to 100 mA (7 ranges)
Max. current ±30 mA ±200 mA
Electrode connections WE, RE, CE, and ground WE, RE, CE, Sense, and ground
dc-potential range ±3 V ±6 V
compliance voltage ±5 V ±8 V
maximum current ±30 mA ±200 mA
max. data acquisition rate 1 000 000 samples /s
applied potential resolution 100 µV 183 µV
applied potential accuracy

≤ 0.2% ±1 mV offset

current ranges

1 nA to 10 mA

8 ranges

100 nA to 100 mA

7 ranges

measured current resolution 0.009% of CR (92 fA on 1 nA range)
measured current accuracy ≤ 0.2% at Full Scale Range
current ranges

10 nA, 1 uA, 100 uA, 10 mA

4 ranges

1 uA, 100 uA, 10 mA, 100 mA

4 ranges

applied dc-current

±3 * CR (current range)

applied dc-current resolution

0.01% of CR

0.0183% of CR

applied dc-current accuracy <0.4% (gain) + 0.002 * CR (offset)
measured dc-potential resolution

96 µV at ±3 V (1 V range)
48 µV at ±1.5 V (500 mV)
19.2 µV at ±0.6 V (200 mV)
9.6 µV at ±0.3 V (100 mV)
4.8 µV at ±0.150 V (50 mV)

193 µV at ±6 V (1 V range)
96.5 µV at ±3 V (500 mV)
38.5 µV at ±1.2 V (200 mV)
19.3 µV at ±0.6 V (100 mV)
9.65 µV at ±0.3 V (50 mV)

measured dc-potential accuracy ≤ 0.2% ±1 mV offset
frequency range 10 µHz to 200 kHz
ac-amplitude range

1 mV to 900 mV rms, or 2.5 V p-p

measured current accuracy ≤ 0.2% at Full Scale Range
frequency range 10 µHz to 200 kHz
ac-amplitude range 

0.9 * CR (Arms)

electrometer amplifier input > 1 TΩ // 10 pF

10 kHz default or

500 kHz for EIS and fast CA/CP

electrode connections

and ground

and ground

dimensions 62 mm X 40 mm X 7 mm
weight ± 130 g
power + communication USB-C port
internal storage space 500 MB, equivalent to > 15M datapoints
EmStat4M LR EIS Accuracy Contour Plot
EmStat4M HR EIS Accuracy Contour Plot
The accuracy contour plots were determined with an ac-amplitude of ≤10 mV rms for all limits, except for the high impedance limit, which was determined using an ac-amplitude of 250 mV. The standard cables were used. Please note that the true limits of an impedance measurement are influenced by all components in the system, e.g. connections, the environment, and the cell.



PSTrace for Windows provides support for all techniques and device functionalities. With a smooth simple interface, showing only the applicable controls, PSTrace is suitable for all levels of user experience. Functions include:

  • Direct validation of method parameters
  • Equivalent Circuit Fitting
  • Automated peak search
  • Scripting for running an automated sequence of measurements
  • Open data in Origin and Excel with one click of a button
  • Load data from EmStat4 internal storage
More information about PSTrace
PSTrace Method Editor

Software Development Kits

The PalmSens Software Development Kits (SDKs) for .NET can be used with any of our instruments or OEM potentiostat modules to develop your own software. The SDK’s come with a set of examples that shows how to use the libraries.

PalmSens SDKs with examples are available for the following .NET Frameworks:

  • WinForms
  • WPF
  • Xamarin (for Android)
More information about SDKs for .NET

MethodSCRIPT™ communications protocol

The EmStat4 potentiostat module has an on-board parser for the MethodSCRIPT scripting language. This language allows developers to program a human-readable script for the EmStat4 module on any platform or operating system. The simple script language allows for running electrochemical techniques supported by EmStat4 and makes it easy to combine different measurements and other tasks.



Software (6)

Name Last updated
PalmSens SDK for Python PalmSens Python SDK 5.9 with support for PalmSens instruments. 07-11-22
PSTrace PC software for all single channel instruments PSTrace software is shipped as standard with all single channel and multiplexed instruments. The software provides support for all techniques and device functionalities. 17-03-22
Getting started with PalmSens SDK for WPF This manual explains how to use the SDK with the included libraries and examples. 07-06-21
Getting started with PalmSens SDK for WinForms This manual explains how to use the SDK with the included libraries and examples. 07-06-21
Getting started with PalmSens SDK for Android This manual explains how to use the SDK with the included libraries and examples. 07-06-21
MethodSCRIPT code examples MethodSCRIPT code examples include: <br>- MethodSCRIPTExample_C <br>- MethodSCRIPTExample_C_Linux <br>- MethodSCRIPTExample_C# <br>- MethodSCRIPTExample_Arduino <br>- MethodSCRIPTExample_Python <br>- MethodSCRIPTExample_iOS <br>- MethodSCRIPTExample_Android <br>Every code example comes with a "Getting Started" document. 08-04-20

Application Note (1)

Name Last updated
Migrating to the EmStat4M LR or HR This Application note shows the differences between our older and latest EmStat modules which are relevant when switching your software and electronics design to work with the EmStat4 LR or HR. 06-10-22

Documentation (5)

Name Last updated
EmStat4M Brochure EmStat4M Brochure including main specifications and practical limitations. 09-09-22
EmStat4M Connection Card This connection card provides an overview of the connector pin-outs. 14-03-22
MethodSCRIPT communication protocol v1.3 The MethodSCRIPT scripting language is designed to improve the flexibility of the PalmSens potentiostat and galvanostat devices for OEM users. It allows users to start measurements with arguments that are similar to the arguments in PSTrace. PalmSens provides libraries and examples for handling low level communication and generating scripts for MethodSCRIPT devices such as the EmStat Pico and EmStat4. 19-01-22
EmStat4M Communication Protocol Describes how to communicate with the EmStat4M directly and how to send MethodSCRIPTS. 14-10-21
MethodSCRIPT communication protocol v1.2 MethodSCRIPT v1.2 protocol description 28-04-20

Datasheet (1)

Name Last updated
EmStat4M Datasheet Document with more detailed specifications including module pin-out. 14-03-22

Other (1)

Name Last updated
EmStat4M Altium symbol and footprint The ZIP file contains an Altium library with EmStat4M footprint and symbol 19-10-21
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