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USB powered potentiostat / galvanostat with EIS

  • Two versions: Low Range and High Range
  • Potential range ±3 V or ±6 V
  • Max. current ±30 mA or ±200 mA
  • FRA / EIS: 10 μHz up to 200 kHz
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 EmStat4S delivers desktop performance in the palm of your hand. The EmStat4S is a portable USB-powered Potentiostat, Galvanostat, and optional a Frequency Response Analyser (FRA) for Electrochemical Impedance Spectroscopy (EIS). The EmStat4S is controlled with PSTrace for Windows, or you can write your own MethodSCRIPT and control it from any platform or operating system.


The EmStat4S comes in two different versions:

  • Low Range: current range from 1 nA to 10 mA (max. 30 mA)
  • High Range: 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 EmStat4S 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.

Standard included

A standard EmStat4S includes a rugged carrying case with:

  • EmStat4S
  • USB-C cable
  • Sensor cable: high quality, double-shielded cable with 2 mm banana connectors for Working, Counter, Reference electrode and Ground
  • 4 or 5 crocodile clips
  • Dummy Cell
  • PSTrace software for Windows (on USB drive)
  • Manual (hardcopy)
  • 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 in November 2021.
Missing a technique? See cross-reference list


The EmStat4S is available in two versions: the LR (Low Range) and HR (High Range) version.

Main differences between the EmStat4S 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,
2 mm banana plugs
WE, RE, CE, Sense, and ground,
2 mm banana plugs
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,
with 2 mm banana plugs

and ground,
with 2 mm banana plugs


aluminum body:
7.2 x 5.5 x 2.6 cm3


± 130 g

power + communication

USB-C port

internal storage space

500 MB, equivalent to > 15M datapoints

EmStat4S LR EIS Accuracy Contour Plot
EmStat4S 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
EmStat4S description The description document of the EmStat4S instrument contains an overview of all techniques, specifications, the software PSTrace, Countour plots, kit contents, and scripting. Documentation 19-05-21
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