Gamry Reference 3000 - Appendix E - Auxiliary Electrometer Specifications; DC Voltage Measurement; Input Impedance; Common Mode Rejection

Appendix E – Auxiliary Electrometer Specifications--DC Voltage Measurement
15 - 1
Appendix E – Auxiliary Electrometer Specifications
Unless otherwise mentioned, all specifications apply at 22° C, zero common mode voltage versus Ground FA,
input voltages with Z
out
< 10 Ohms, and all channel inputs (other than those of the channel under test) at zero
volts versus Ground FA. All measurements are made with the Aux Channel A/D with normal Framework
calibration.
DC Voltage Measurement
Offset Voltage < 500 µV 20° C to 25° C At all gain ranges
Temp Drift < 10 µV/°C from 0 to 45° C
Ranges ± 50 mV, ±500 mV, ± 5V Full Scale Differential Input Voltage
Resolution 1.666 µV, 16.66 µV, 166.6 µV per bit Differential Input Voltage
Gain Error < 0.3% on all ranges
Offset Range ± 5.12 V offset of differential signal
Offset Resolution 166.6 µV/bit
Input Current < 10 pA zero volts input measure by voltage
Input Impedance
Common Mode > 30 GΩ in parallel with -36V < Vcm < 36 V versus floating ground
< 100 pF
Differential > 100 GΩ in parallel with -5V < Vdiff < 5 V measured between
< 40 pF the two inputs
Common Mode Rejection
CMR Range -36 V < Vin < 36V versus Floating Ground
CMRR > 94 dB @ 3 Hz
> 86 dB @ 100 kHz
Crosstalk
Low Frequency < -90 dB DC to 10 kHz
High Frequency < -80 dB 10 kHz to 100 kHz