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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 techniques 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 module delivers desktop performance in the palm of your hand. The EmStat4M is a potentiostat/galvanostat supporting Electrochemical Impedance Spectroscopy (EIS). The EmStat4M can be used with PSTrace 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.

Always a backup

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.
Measurements can be browsed and transferred to the PC easily using the PSTrace software for Windows.

EmStat4M Development Kits

The EmStat4M module can be ordered as a bare module or as part of a kit. We offer a Starter Kit as well, which includes a sensor cable, software and more. See the table below for an overview of what is included in the Starter Kit. 

  Module only Starter Kit
EmStat4M LR or HR module
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 planned for early 2022.
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
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 (gain 1)

48 µV (gain 2)

19.2 µV (gain 5)

9.6 µV (gain 10)

4.8 µV (gain 20)

193 µV (gain 1)

96.5 µV (gain 2)

38.5 µV (gain 5)

19.3 µV (gain 10)

9.65 µV (gain 20)

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


62 mm X 40 mm X 7 mm


± 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.


Name Type Last updated
EmStat4M Altium symbol and footprint The ZIP file contains an Altium library with EmStat4M footprint and symbol Other 19-10-21
EmStat4M Datasheet Document with more detailed specifications including module pin-out. Datasheet 18-10-21
EmStat4M Description Description of the EmStat4M including main specifications and practical limitations. Documentation 18-10-21
EmStat4M Communication Protocol Describes how to communicate with the EmStat4M directly and how to send MethodSCRIPTS. Documentation 14-10-21
MethodSCRIPT v1.2 protocol description MethodSCRIPT v1.2 protocol description Documentation 28-04-20
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