CHI200(B) Picoamp Booster and Faraday Cage

With the CHI200(B) Picoamp Booster and Faraday Cage, current down to a few picoamperes can be readily measured. The CHI200 is compatible with the Model 600/A, 700/A series of instruments, while the CHI200B is compatible with Model 600B/C/D/E, 700B/C/D/E and 800B/C/D series. When used with a 700/A/B/C/D/E and 800B/C/D series bipotentiostat, the Picoamp Booster will affect the primary channel only.

The internal sensitivity of the 600B/C/D/E series is the same as the Picoamp Booster (1x10-12 A/V). However, the bias current of the 600B/C/D/E series input can be as high as 50 pA. The Picoamp Booster has a lower bias current, and it also brings the preamplifier close to the electrode, resulting in lower noise. The Faraday Cage also makes it possible to make relatively fast measurements of small currents.

When the Picoamp Booster is connected and the sensitivity scale is at or below 1e-8 A/V, the Picoamp Booster will be automatically enabled. Otherwise it will be disabled. Detection of the Picoamp Booster and its enabling/disabling are fully automatic and do not require user intervention.

The Picoamp Booster will be disabled for techniques using automatic sensitivity switching, such as Tafel plots (TAFEL) and bulk electrolysis (BE), and galvanostatic techniques. For galvanostatic techniques, such as chronopotentiometry (CP), chronopotentiometry with Current Ramp (CPCR), Multi-Current Steps (ISTEP), and Potentiometric stripping analysis (PSA), the Picoamp Booster will not work. However, it works with AC impedance (IMP).

In addition to allowing weak signal measurements, the Faraday cage is useful for eliminating electrical interference, especially line frequency noise. If the electrochemical cell is picking up electrical noise from the environment, the additional use of the Faraday cage is strongly recommended.

Dimensions: 9.6"(W) x 8.8"(D) x 11.8"(H)   Weight: 10 lb.

faraday cage

Cyclic voltammogram at an ultramicroelectrode


Differential pulse voltammogram at an ultramicroelectrode.

CHI680C Amp Booster

With the CHI680C Amp Booster, the current can be measured up to 2 A. The CHI680 is compatible with our model 600, 600A, 600B, 600C and 600D series of instruments. The CHI680C is compatible with our model 600D/E series of instruments. You can stack the CHI600D/E and the CHI680C together. The CHI680C can also be connected to the model 700E series, but it will only work for the primary channel.

When the Amp Booster is connected, cell control signals such as purge, knock, and stir will be disabled.

The Amp Booster will also allow low current measurements. You may need to use a Faraday cage to eliminate line frequency noise when the scan rate is above 50 mV/s.

The frequency response of the Amp Booster is somewhat lower than that of the CHI600/A/B/C/D/E. For high speed experiments, the Amp Booster should be disconnected.

Dimension: 12.5”(W) x 11”(D) x 4.75”(H)

Weight: 17 lb.

CHI684 Multiplexer

The CHI684 is a multi-channel multiplexer for the model 400/A/B, 600A/B/C/D/E, 700A/B/C/D/E, 800B/C, 900B/C/D, and 1100A/B/C series. The multiplexer switches four lines (working, sensing, reference, and counter for single-channel potentiostats; working, 2nd working, reference, and counter for bipotentiostats). You can have up to 64 cells, but only one cell can be connected at a time.

The multiplexer is controlled using the "Multiplexer" command under the Control menu. You can select any channel(s) and run experiments in a sequence of selected channels. Data will automatically be saved to file after each run. You can also be prompted before each channel run.

Arbitrary channels can be set immediately. An experiment can then be run for that particular channel.

Two Macro commands are available for the multiplexer. One is "mch:##", which allows the user to choose an individual channel. The other macro command is "mchn". This is used in a For...Next loop to select the channel according to the For...Next loop counter.

The minimum number of channels for the CHI684 is 8. The channel increment is 8. The maximum number of channels is 64.