NOTES:
1. Measured in galvanostatic mode with a high-power 200 Ω load connected from counter electrode
lead to the working electrode lead. The compliance voltage is measured using an external voltmeter
across the 200 Ω load. Under these conditions, the output current is approximately 115 mA.
2. Measured with a precision 4-terminal 2 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 Amplifiers 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 V. They are only a
high-impedance buffer from –12 V to +9.5 V, 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 µA range. The specified current is only applicable at voltages
of 2 V 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 600+.
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 V signal input to the ADC signal chain. A 4
attenuator divides down higher-voltage electrometer outputs so they fit into a 3 V input, thus making
a 12 V full-scale range.
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