Which process dominates resistance or time-dependent response?
Frequency sweep
Performance Testing · Electrical & Electrochemical
Electrical / Electrochemical Impedance Analysis
Resolve resistive, capacitive and transport processes using impedance magnitude and phase across frequency.
- Price
- from£90 per sample, excl. VAT
- Turnaround
- 6 working days Preparation and scope dependent
- Available platforms
- BioLogic VSP-300
- Typical outputs
- Nyquist plotBode magnitude and phaseFitted circuit parameters where justifiedFrequency, amplitude and bias conditions
Why this service
What Impedance can help you understand
Electrical and electrochemical impedance spectroscopy applies a small AC perturbation across frequency. Nyquist and Bode responses can separate bulk, interface, diffusion and contact contributions when…
How do interfaces, ageing or temperature change impedance?
Bias or temperature-dependent EIS
Can an equivalent circuit support a defensible comparison?
Equivalent-circuit comparison
Choose the scope
Start from the question, not the tool
The method, preparation route and reporting depth depend on what you need to decide.
Frequency sweep
Which process dominates resistance or time-dependent response?
- Best used when
- Which process dominates resistance or time-dependent response?
- Typical result
- Nyquist plot
- Preparation note
- Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements.
Bias or temperature-dependent EIS
How do interfaces, ageing or temperature change impedance?
- Best used when
- How do interfaces, ageing or temperature change impedance?
- Typical result
- Bode magnitude and phase
- Preparation note
- Confirm the applicable standard, dimensions, loading direction and number of replicates.
Equivalent-circuit comparison
Can an equivalent circuit support a defensible comparison?
- Best used when
- Can an equivalent circuit support a defensible comparison?
- Typical result
- Fitted circuit parameters where justified
- Preparation note
- Confirm power, connections, operating state, access restrictions and permitted disassembly.
Common outputs
A result package matched to the decision you need to make
Fields, conditions, processing and file formats are confirmed before work begins.
Nyquist plot reported with the agreed units, sample reference and measurement conditions.
Bode magnitude and phase supplied in a labelled format suitable for direct sample or condition comparison.
Fitted circuit parameters where justified provided with the processing basis and quality checks agreed during technical review.
Frequency, amplitude and bias conditions included when selected in the confirmed reporting scope.
Sample requirements
What to provide before work begins
Provide representative, clearly labelled samples and identify the decision, feature or comparison that matters.
| Suitable sample | Submission requirement | Planning note |
|---|---|---|
| Biological / soft material | Provide fixed, preserved or otherwise stabilised material in the agreed container and medium. | Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements. |
| Test coupon / specimen | Provide labelled specimens prepared to the agreed geometry, orientation and surface condition. | Confirm the applicable standard, dimensions, loading direction and number of replicates. |
| Device / assembly | Provide a complete labelled device or assembly with drawings, interfaces and operating limits. | Confirm power, connections, operating state, access restrictions and permitted disassembly. |
Objective: state the decision, comparison or acceptance criterion the work must support.
Handling and access: declare hazards, instability, confidentiality, file constraints or special logistics before dispatch or transfer.
Questions and answers
Common planning decisions
Short answers to issues that can change preparation, scope, timing or interpretation.
Is circuit fitting included?
Basic fitting can be included when a physically justified model is agreed; complex model development is quoted separately.
What is the typical turnaround?
Typical turnaround is 6 working days after sample acceptance and method confirmation.
Configure the service
Send the information needed to scope Impedance correctly
- Sample form, material, dimensions and quantity
- Feature or decision the result must address
- Required comparison, acceptance criterion or reference
- Preferred output and reporting depth