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Description
The Model 880 Frequency Response Analyzer (FRA) Electrochemical Impedance Spectroscopy and High Frequency Resistance Measurements is available for integration with the Scribner’s electronic load used in the 840 / 850 / 890 series of fuel cell test products. The 880 FRA meets or exceeds the performance and accuracy requirements needed for all fuel cell testing applications.
The 880 FRA and FuelCell® software facilitates continuous, single-frequency High Frequency Resistance (HFR) and full-frequency range Electrochemical Impedance Spectroscopy (EIS) analysis of an operating fuel cell. HFR can be performed concurrently with current interrupt (IR drop) measurement for orthogonal determination of the cell internal or ohmic resistance.
The 880 FRA can also be integrated with the Model 910 Multi-Channel Microelectrode Analyzer (MMA) for impedance spectroscopy of electrode and sensor arrays.
Key features
| • Generator Frequency Range | 1 mHz to10 kHz |
| • Frequency Error | < 0.01% |
| • Amplitude Range | ±10 mV to ±3.000 V |
| • Amplitude Resolution | 1 part in 32,768 |
| • Amplitude Error | < 1% ± 1 digit |
| • Distortion | < 0.02% |
| • Analyzer Type | Quadrature method (digital correlation) |
| • Input Ranges(RMS) | 30 mV, 300 mV, 3 V RMS |
| • Full Scale Peak Input | 50 mV, 500 mV, 5 V |
| • Cross Channel Isolation | > 100 dB |
| • Measurement Time, minimum | Longer of 1 cycle or 10 ms |
| • Measurement Cycles | Dependent on integration setting |
| • Error Limits | 0.5% Magnitude error (1 mHz to 10 kHz) / 0.5 ° Phase error (1 mHz to 10 kHz) |
Technical Specifications
| Electronic Load | ||
| Maximum Load Current | 5, 15, 25, 50 or 125 A (configuration dependent) | |
| Maximum Load Power | 125 W (15, 25, 50 A units), 100 W (5 A unit), 500 W (125 A unit) | |
| Minimum Load Resistance | <2 mW for 125/50 A, <3 mW for 25 A unit | |
| Current Resolution | 1 mA on 5 and 15 A units 10 mA on 25, 50 and 125 A units |
|
| Current Accuracy | ±0.3% of full scale current rating | |
| Voltage Measurement and Data Acquisition | ||
| Maximum Whole Cell Voltage | 20 V | |
| Maximum Reference Electrode Voltage | 9.999 V | |
| Sense Lead Input Resistance | >35 kW | |
| Voltage Resolution | 1 mV | |
| Voltage Accuracy | ±3 mV ±0.3% of reading | |
| Voltage and Current Data Update Rate | 100 Hz | |
| Fuel Interface | ||
| Outputs for anode, cathode MFC | Two, Analog (0-5 V) | |
| Alarm Inputs | Six: Three for gas pressures, three auxiliary | |
| Fuel Solenoid Control | One 5 V output (external relay needed) | |
| Temperature Controllers | ||
| Quantity | One or three (see options) | |
| Type | On/off 5 V output (external SSR required) | |
| Set and Report Accuracy | ±0.25% of span, ±1 least significant digit | |
| Sensor Type | Thermocouple, Type T, K, or S (specify) | |
| Environment | ||
| Operating Temperature | 0 to 40 °C ambient | |
| Power Source | 100-240 VAC, 50/60 Hz (auto select) | |
| Size | 3U standard rack mount, 19″W x 5.25″H x 21″D | |
| Configuration Options at Manufacture | ||
| Reformate outputs | Up to 5 additional channels available | |
| Current Range | Select 5, 15, 25, 50 or 125 A | |
| Temperature Control Channels | Standard configuration of 3 controllers | |
| Hardware Notes | ||
| Thermocouple connector type | Miniature connectors, T, K or S type | |
| Enclosure | Aluminum chassis, polymer panel overlay | |
