Gamry Instruments EIS Box 사용 설명서 - 페이지 5

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Figure 6-1 Front Panel of the EIS Box

The upper (female) connectors are labeled Current Connector. They

carry the cell current between the Counter electrode wires and the

Working electrode wires.

The lower (male) connectors are labeled Sense Connector. They contain

only high-impedance inputs used to sense potentials in the cells.

Gamry's EIS Box standard cell cables always come in pairs. Each cable

has a D-connector on one end, and a number of leads to connect to

electrodes in an electrochemical cell. The D-connector end of the cable is

connected to the appropriate D-Connector on the front of the EIS Box.

The male and female cables cannot be interchanged.

Every EIS Box is shipped with eight pairs of standard shielded cell cables.

The Gamry part number for the Current Cable is 985-00183, and the

Sense Cable is 985-00184. They are both 3 m complex cables, with D

connectors on one end, and color-coded banana plugs on the other end.

Always screw both cell cables into place because cables can fall off the

unit if not properly attached. This can be disastrous if detachment occurs

during an experiment.

Ancillary Apparatus

Do not use the EIS Box with ancillary apparatus connected directly to any

of the cell leads. Examples of ancillary apparatus include DVMs,

oscilloscopes, chart-recorders, and data-loggers. Ammeters and

voltmeters, regardless of their specifications, almost always create

problems when connected to the EIS Box cell leads

Normal Cell Connections

This section assumes that you are using standard, shielded cell cables.

This information does not depend on the length of such cables.

The cell end of the standard cell cables terminates in a number of

banana plugs and pin jacks. Each termination comes with a removable

alligator clip. Table 6-1 identifies the terminals of the cables.

Color

Type

Name

Blue

Banana Plug

Working Sense

Green

Banana Plug

Working Electrode

White

Banana Plug

Reference

Red

Banana Plug

Counter Electrode

Connect both the blue and green cell leads to the positive terminal

(usually). The working electrode is the electrode being tested. The blue

plug connection senses the voltage of the working electrode. The green

working electrode connection carries the cell current. The working

electrode may be as much as 520 mV above the circuitry ground

(floating ground).

Connect the white plug to the negative terminal (usually). The measured

cell potential is the potential difference between the blue and white cell

connectors.

Normal Connection

Connect to working electrode

Connect to counter electrode

Connect the red banana plug to the negative terminal also. The counter-

electrode terminal is the output of the EIS Box's power amplifier.

If your cell is a typical glass laboratory cell, all of the electrodes are

isolated from earth ground. In this case, you may be able to reduce noise

in your data by connecting the EIS Box's Floating Ground to an earth

ground.

Warning: Make sure that your earth-ground connection is

made to a legitimate source of earth ground. Consult a

qualified electrician if you are uncertain how to obtain an

earth ground. Connecting the EIS Box to an incorrect and

unsafe voltage can create a safety hazard

Caution: If any electrode in your cell is at earth ground,

never connect the EIS Box Protective Ground to System

(floating) Ground. Autoclaves, stress apparatus, and field

measurements may involve earth-grounded electrodes.

water pipe can be a suitable earth ground.

Membrane Cell Connections

The EIS Box can be used with membrane cells. In this type of cell, a

membrane separates two electrolyte solutions. Two reference

electrodes are used: one in each electrolyte. Each electrolyte also

contains a counter electrode. The EIS Box controls the potential across

the membrane. Table 6-2 shows the cell connections used with a

membrane type cell.

Color

Type

Name

Blue

Banana Plug

Working Sense

Green

Banana Plug

Working Electrode

White

Banana Plug

Reference

Red

Banana Plug

Counter Electrode

Table 6-2 Cell Cable Connections for a Membrane Cell

Reference electrode #1 and counter electrode #1

must be on one side of the membrane and

reference electrode #2 and counter electrode #2

must be on the other side.

Panel Indicators and Connectors

Front Panel

Power Switch

The Power switch is on the far right side of the EIS Box Front Panel.

Normally the blue Power LED illuminates when the EIS Box is powered

on; see the Power LED description below.

Normal Connection

Connect to reference electrode #1

Connect to counter electrode #1

Connect to reference electrode #2

Connect to counter electrode #2