Advanced Measurement Technology 273A, Руководство пользователя

Страница: 9 / 70

Chapter 1—Introduction 3
Warning! The protective grounding could be rendered ineffective in damaged apparatus.
Damaged apparatus should not be operated until its safety has been verified by
qualified service personnel. Damaged apparatus should be tagged to indicated to a
potential user that it may be unsafe and that it should not be operated.
1.4. Polarity Convention
The Model 273A follows the American polarity convention and the display indications are
consistent with that convention. Positive current is catholic, that is, a current is defined as
positive if reduction is taking place. Negative current is anodic, that is, a current is defined as
negative if oxidation is taking place.
In potentiostatic operation, making the applied potential more positive will make the current tend
to be more anodic. Conversely, making the applied potential more negative will make the current
tend to be more catholic. This is true for all potential sources, including EXTERNAL INPUT.
In galvanostatic operation, making the applied current more positive by any means except
applying a potential to the EXTERNAL INPUT will tend to make the current more catholic.
Making the applied current more negative will tend to make the current more anodic. This sense
is reversed at the front panel external input. Them making the input more positive will make the
cell current more anodic. Making the input more negative will make the cell current more
cathodic.
Bear in mind that the EXTERNAL INPUT is a high-impedance (100 k ) input in both
potentiostatic and galvanostatic operation. (In galvanostatic operation, 1 V applied results in a
full-scale current.)
1.5. Inspection of New Instrument
Newly received apparatus should be inspected for shipping damage. If any is noted, immediately
notify Princeton Applied Research and file a claim with the carrier. Save the shipping container
for possible inspection by the carrier.
1.6. Maintenance and Service
The Model 273A Potentiostat/Galvanostat has been designed for optimum reliability, and
requires no periodic maintenance.
This manual contains no service information. The Model 273A is very difficult to service in the
field; special fixtures and services are required that are not readily obtainable except at the
factory or at certain affiliate facilities. Contact the factory service department or the affiliate in
your area if service is required.
There are no operator serviceable parts inside. Refer servicing to qualified personnel.