The Model 700C series are computerized general purpose potentiostat / bipotentiostats / galvanostat instruments. A typical application involves a rotating ring-disk electrode (RRDE), but these systems can also be used for other applications where dual channel measurements are essential, such as dual channel electrochemical detection. The system contains a fast digital function generator, high speed data acquisition circuitry, (bi)potentiostat, and a galvanostat (only available in select models). The potential control range is ±10 V and the current range is ±250 mA. The instrument is capable of measuring current down to tens of picoamperes. The steady state current of a 10 mm disk electrode can be readily measured without external adapters. With the CHI200 Picoamp Booster and Faraday Cage (fully automatic and compatible with the CHI700C series), currents down to 1 pA can be measured (primary current channel only). These instruments are very fast. The function generator can update at a 5 MHz rate, and the maximum sampling rate is 1 MHz. The instrument provides a very wide dynamic range on experimental time scales. For instance, the scan rate in cyclic voltammetry can be up to 500 V/s with a 0.1 mV potential increment or 5000 V/s with a 1 mV potential increment. The potentiostat / galvanostat uses a 4-electrode configuration, allowing it to be used for liquid/liquid interface measurements and eliminating the effect of contacting resistance of connectors and relays for high current measurements. Multiple data acquisition systems allow an external input signal (such as spectroscopy signals to be recorded simultaneously with electrochemical data). The instrument will also automatically re-zero both potential and current, so that periodic re-calibration of the instrument can be avoided.

                The 700C series shares many common features with the 600C series. When used as a single channel potentiostat, the instrument is identical to the model 600C series. The bipotentiostat is realized by adding the second channel potential control and current measurement board to the model 600C series. There are also two filter stages, three extra gain stages, and a channel selection circuitry on the board. When it is used as a bipotentiostat, the second channel can be controlled at an independent constant potential, to scan or step at the same potential as the first channel. In case of CV, it can also scan with a constant potential difference with the first channel. Techniques available for the second channel include CV, LSV, SCV, CA, DPV, NPV, SWV, and i-t.

                The 700C series is the upgrade to our very popular 700B series. The analog-to-digital converter has been changed from 12-bit to 16-bit. The maximum sampling rate is 1 MHz. The instrument also now utilizes FLASH memory, allowing instrument updates to be distributed by e-mail instead of the shipment of an EPROM chip.

                The 700C series has a serial port (default) and a USB for data communication with the PC. You can select either serial port or USB (but not both) by changing the jumper setting on the board.

The 700C series also has a true integrator for chronocoulometry.

A 16-bit highly stable bias circuitry is used for current or potential bias. This allows wider dynamic range is ac measurements. It can also be used for re-zero the dc current output.

When used as a single channel potentiostat, the instrument is identical to the model 600C series. The bipotentiostat is realized by adding the 2^nd channel potential control and current measurement board. When it is used as bipotentiostat, the 2nd channel can be controlled at a independent constant potential, to scan or step at the same potential as the first channel, and to scan with a constant potential difference with the first channel. We will also try to make more voltammetric and amperometric techniques work for 2nd channel.

We provide several different models in the 700C series. The following table compares the different models. Other than what is listed, the specifications and features of these models are identical. Models 700C and 710C are basic units for mechanistic study and electrochemical analysis, respectively. Models 720C and 730C are comprehensive electrochemical analyzers. Model 750C and 760C are advanced electrochemical workstations.

Specifications

Differences Between 700C Series Models