Appendix A -- Interface 1000 Specifications--Floating Operation
9 - 4
General
Power Input Voltage Range
46 to 50 volts
Power Max 75 W
Leakage Current
(floating, earthed Working Electrode)
± 1 nA
Note 22
Dimensions 24 x 27 x 6 cm Note 23
Weight Max 2.0 kg Note 23
Dimensions of External Power Adapter Max 13 x 6 x 3 cm Note 24
Weight of External Power Adapter Max 300 grams Note 24
NOTES:
1. Measured in galvanostatic mode with a high wattage 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 A/D and signal processing chain in the Interface 1000 allows measurement of voltage signals as
large as ±13.107 V. The voltage on the Work Sense lead can be as high as ±0.4 V when measuring 1A
using a 60 cm cell cable. This implies a maximum voltage input on the differential electrometer of
±13.6 V.
In practice, the operational amplifiers in the voltage signal processing circuitry cannot guarantee
voltages beyond ±12.5 V.
6. This specification is tested using a 2 GΩ resistor switched into the input and measuring the voltage
difference with and without the input resistance.
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 (open lead) 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 routine testing of the Interface 1000.
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 performed with a ±3 nominal volt signal input to the ADC signal chain. The
actual full scale is 3.2768 V. A ÷4 attenuator divides down higher voltage electrometer outputs so
they fit into a ±3 volt input, thus making a ±12 volt nominal (13.1072 V) actual full scale range.
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