Advanced Measurement Technology 273A, User Manual

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Chapter 3—Characteristics 13
2. E MONITOR: ± 10 V analog output with output impedance of 1 k . This is the potential of
the working electrode with respect to the reference electrode. IR compensation, if active, will
affect the E MONITOR output level This same output is provided at the rear-panel
RECORDER INTERFACE connector.
3. I MONITOR: I/E Converter Output. ± 1 V for full-scale current; 2 V maximum. Output
impedance: 1k .
4. OUTPUT: Analog output that tracks current (linear or log) or charge (coulombs). Output
impedance is 1 k .
Linear: Tracks I MONITOR output; 1 V for full-scale current; 2 V maximum.
Log: 1 V per decade; ± 10 V maximum. A current equal to the Log Reference Range
(selected by Function 12) gives 0 V out.
Coulombs: ± 10 V. Initial sensitivity is one full-scale current for one second gives 10 V out.
Sensitivity decreases by factor of ten at 10 V. Sensitivity ranging repeats as required to
accommodate total charge. Bipolar.
3.1.14. Rear-Panel Connectors
1. CELL INTERFACE: Connections to cell are made with provided cable via this connector.
2. POWER AMP MONITOR: Amplifier output divided by ten. ± 100 V range of amplifier output
gives ±10 V POWER AMP MONITOR output. Output impedance is 1 k .
3. ELECTROMETER MONITOR: Output of the differential electrometer. Not corrected for IR
drop (unlike front-panel E MONITOR output). Output impedance is 1 k .
4. AUXILIARY INTERFACE: Provides triggers and Model 303A control signals. Note that the
Model 303A is not cabled directly to this connector. It rather is cabled to the Model 307
Interface, which in turn is cabled to the AUXILIARY INTERFACE connector.
5. AUX A/D INPUT: ±10 V, high-impedance, analog input (useful for galvanic corrosion,
spectro-electrochemical, and other measurements). Input impedance: >10 .
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6. RECORDER INTERFACE: 15-pin connector provides Y output (identical to front-panel
OUTPUT signal), X output (identical to front-panel E MONITOR signal), contact closure
lines for pen up/down control, and ground.
7. RS-232C INTERFACE: Serial port for control of the Model 273A from an external computer.
Associated switch assembly sets RS-232C parameters (exception: Terminator, <CR> or
<CRLF>, is set by switch in the GPIB switch assembly). Note: The maximum potential that
can be applied to this port is ± 15 V. The Model 273A Remote-Programming Command
Handbook describes switch settings and communications protocols.
8. IEEE-488/GPIB INTERFACE: Parallel port for control of the Model 273A from an external
computer. Associated switch assembly sets GPIB Address, Terminator, and status of Test
Echo function. The Model 273A Remote-Programming Command Handbook describes
switch settings and communications protocols.
9. AC I OUTPUT (used only in units equipped with the 273A/92 Electrochemical Impedance
Interface option): Outputs the ac current signal from the test cell. The signal is controlled by
commands from an external computer via the GPIB or RS-232C port.