Gamry Reference 3000 Operator's Manual page 90

General
Power Input Voltage
Power
Leakage Current
(floating, earthed Working Electrode)
Dimensions (approximate) (whd)
Weight (approximate)
Dimensions of External Power Adapter
(approximate)
Weight of External Power Adapter
(approximate)
NOTES:
1. a) Measured in potentiostatic mode with a high wattage 20 Ω load connected from counter electrode
lead to the reference lead and a 2 Ohm load between the reference lead and the working electrode
lead. The compliance voltage is measured using an external voltmeter across the 22 Ω load. Under
these conditions, the output current is approximately 1.4 A.
b) Measured in potentiostatic mode with a high wattage 3 Ω load connected from counter electrode
lead to the reference lead and a 2 Ohm load between the reference lead and the working electrode
lead. The compliance voltage is measured using an external voltmeter across the 5 Ω load. Under
these conditions, the output current is approximately 5 A.
2. Measured with a 4-terminal 0.05 Ω load, in potentiostatic mode.
3. Unity gain bandwidth and slew rate are correlated. Each has five settings, with the highest slew-rate
occurring at the highest bandwidth, down to the lowest slew-rate occurring at lowest bandwidth. Both
are measured with 20 kΩ between counter and reference and 100 Ω between the reference and the
working and working sense leads
4. Measured with an external function generator connected to the Ext Sig In BNC.
5. The Differential Electrometer Amps are Analog Devices AD8065 Op amps specially selected for low
Vos drift versus temperature. These amps have a dual input stage, with a JFET input over most of their
input range and a bipolar transistor input at input voltages greater than + 9.5 volts. They are only a
high impedance buffer from –12 volts to +9.5 volts, though they are a unity gain buffer over their
whole input voltage range.
6. The input current of the JFET inputs on the AD8065s is less than 6 pA. When the Bipolar input is
operative, the input current can be in the microamps. The specified current is only applicable at
voltages of 2 volts or less.
7. The differential impedance is measured between the Reference and Work Sense inputs. This is the
impedance you measure when you record the EIS spectrum of an infinite impedance cell.
There is also a common mode resistance and capacitance associated with the differential electrometer
inputs. These values tell you how much the electrometer response is modified by a resistance in series
with the source.
8. The bandwidth is for a sine-wave source with a 50 Ω output impedance driving either input. The
bandwidth is well in excess of this specification, which is limited by the measurement equipment used
in testing the Reference 3000.
9. CMRR is common mode rejection ratio. It specifies the ability of the differential electrometer to reject
signals connected to both inputs. The CMRR is measured driving both inputs with a sine-wave source
with a 50 Ω output impedance, and measuring the error as a function of frequency. Resistance in
either input will cause a loss of CMRR.
10. Voltage measurement is actually performed with a ±3 volt signal input to the ADC signal chain. A ÷4
attenuator divides down higher voltage electrometer outputs so they fit into a ±3 volt input, thus
Appendix A -- Reference 3000 Specifications--
Range 22 to 26
Max 120
± 1 nA
20 x 23 x 30
5
7.5 x 5 x 22
900
11 - 4
volts
W
Note 21
cm Note 22
kg Note 22
cm Note 23
grams Note 23