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4. SPECIFICATIONS AND PINOUTS
4.1. Electrical Specifications, Potentiostatic Circuitry
4.1.1. Power Amplifier
Compliance Voltage
±100 V
Maximum Current
±2 A
Rise Time
<250 ns (no load) typical
Slew Rate
>15 V/µs (no load)
System Performance
!
Minimum Time Base:20 µs
!
Minimum Potential Step:2.5 µV
!
Noise and Ripple:<50 µV rms (typical)
!
Minimum Current Range:2 nA (hardware)
!
Minimum Current Range:40 pA (after 50X gain)
!
Minimum Current Resolution:1.2 fA
4.1.2. Differential Electrometer
Input Bias Current
<5 pA at 25°C
Max. Voltage Range
±10 V maximum
Input Voltage Differential
±10 V
Bandwidth
!
3 dB @ >15 MHz (typical)
Common Mode Rejection
!
>80 dB at 100 Hz
!
>60 dB at 100 kHz
Input Impedance
typically >10
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Ω in parallel with <5 pF
4.1.3. iR Compensation
Positive Feedback
Range:2000 MΩ to 2 Ω (depending on current range)
Current Interrupt
16-bit DAC potential error correction
4.1.4. Current Measurement
Ranges
12 decades, 2 A to 40 pA (with internal gain applied)
Accuracy (dc)
!
20 µA to 2 A:<0.4% full scale
!
20 nA and 1 µA ranges:<0.5%
!
2 nA:<0.75%
Frequency Response (small signal)
!
2 mA range:
!
3 dB at >1 MHz, 1k source impedance
!
20 µA range:
!
3 dB at >100 kHz, 100k source impedance
4.1.5. Potential/Current Control
Digital/Analog Converters (DACs)
Bias DAC
! Resolution 16 bits
! Range (potentiostat) ±10 V
! Range (galvanostat) ±100% of full-scale current
Modulation DAC
! Resolution 16 bits
