1287 Potenciostato/Galvanostato AC/DC a 2, 3 y 4 Terminales

The 1287 Electrochemical Interface brings increased accuracy and reliability to electroanalytical measurement for researchers working in fields such as corrosion protection, battery/fuel cell development, coatings research and biomedical sciences.

The potentiostat/galvanostat is based upon the world renowned Solartron DVM technology, incorporating two "5½ digit", 18 bit DVMs allowing simultaneous measurement of voltage and current. The system also has a considerable bandwidth up to 1MHz, allowing the 1287 ECI to be coupled to any of the Solartron frequency response analysers for dc control during ac measurement. There are a considerable number of features in this instrument which make it the first choice for electrochemical applications. These include:

• Floating electodes - for research on grounded structures such as pipelines, autoclaves and storage tanks.
• High accuracy and stability - 1 micro volt / 1pA current resolution.
• Simultaneous voltage and current measurement using 18 bit DVM technology.
• Wide polarisation levels ± 14.5V, ± 2A.
• 2, 3 and 4 terminal measurement capability.
• > 1MHz bandwidth.
• Driven shield technology.
• IEEE and RS232 interfaces.
• Windows based CorrWare software, allowing a complete range of dc techniques to be studied including LPR measurements, cyclic voltametry and electrochemical noise.
• iR compensation, both feedback / sampled iR compensation and real part correction capability.

The design and performance of the 1287 ECI enables the instrument to control dc bias levels during ac measurement. Electrochemical Impedance Spectroscopy is widely used to provide additional information about reaction mechanisms and interactions. Solartron Frequency Response Analysers are widely recognised as the most accurate technique available for EIS measurement. Using the single sine correlation technique, a digitally generated ac signal can be superimposed onto any dc bias provided by the 1287 ECI, the correlation algorithm providing rejection of any dc offsets and harmonics. With the combination of the 1287 ECI / 1260 FRA it is possible to characterise electrochemical systems over a broad frequency range from 10mHz to 1MHz and at high impedance levels, >100 G ohms.

Configuación de Medida
Cell connections	2, 3 or 4 Terminal, all floating
Electrodo de Trabajo
- current measurement resistor (Rs) range	0.1W to 1MW
- full scale current ranges	2A to 200nA
- limit of error	0.1% ±0.05% of range
Contra Electrodo
- output voltage, wrt LO	>±30V
- current, subject to thermal protection limits	2A
- slew rate, potentiostatic control	>10V/µs
- output short-circuit protected
Electrodo de Referencia
- input impedance	>10GW
- capacitance	50pF
- current	<1nA
- limit of error	0.1% ±100µV
- rejection (f<10kHz / f<1MHz)	75dB / 40dB
Polarización
DC polarisation
- voltage range
- limits of error (f<10kHz / f<1MHz)	0.2%±200µV / 0.2%±2mV
- maximum resolution	100µV
- current change	±2A
- limit of error	0.2%±0.1% of range
- maximum resolution	100pA
DC sweep: analog ramp
- ramp rate (voltage)	6mV/min to 6000V/min
- minimum segment duration	10ms
- maximum segment duration	10^5s
DC sweep: stepped ramp
- minimum step height	5µV/5pA
- maximum step height	29V/4A
- minimum step duration	10ms
- maximum step duration	10^5s
AC input
- voltage range	±10V
- gain	×1, ×0.01
- impedance	10kW
Control loop bandwidth, 100W resistive load, unity gain
- potentiostatic mode, type C stability	>1MHz
- galvanostatic mode, type B stability	>100kHz
Compensation IR y corrección de la Parte Real
Current interruption
- interruption time	26.6µs to 1.36ms
- accuracy	±6µs
- off : on range	1:1 to 1:255
Feedback compensation and real part correction
- range	0 to 1000%Rs
- resolution	1%Rs
- limit of error :f<1kHz :f<10kHz)	- limit of error 0.2%±1%Rs,0.2º 2%±1%Rs,2º
Bias Rejection
Voltage, range	±14.5V
- limit of error	0.2%±10mV
- resolution	5mV
Current, ranges (full scale)	200nA to 2A
- limit of error	0.2%±10mV
- resolution	1% of range

Medidas de Impedancia
Limits of error (for a unity gain cell Zc = Rs, measured with LO grounded) and no error due to reference electrode bandwidth. RE1 and RE2 input capacitance must be corrected to obtain accuracy at high frequency and impedance.

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