Appendix A, SPECIFICATIONS
A-2
Signal Channel
Voltage Inputs
Modes A only, -B only or Differential (A-B)
Frequency Response 0.001 Hz F 250 kHz
Full-scale Sensitivity 2nV to 1 V in a 1-2-5 sequence (e.g. 2 nV,
5 nV, 10 nV)
Input Impedance
FET Input 10 M // 25 pF, AC or DC coupled
Bipolar Input 10 k // 25 pF, input must be DC coupled
Maximum Safe Input ±12.0 V
Voltage Noise 5 nV/Hz @ 1 kHz
C.M.R.R. >100 dB @ 1 kHz degrading by no more than
6 dB/octave with increasing frequency
Gain Accuracy ±1.0% typ, ±2.0% max.
Distortion –90 dB THD (60 dB AC gain, 1 kHz)
Current Input
Mode Low Noise (10
8
V/A) or Wide Bandwidth
(10
6
V/A)
Full-scale Sensitivity
Low Noise 2 fA to 10 nA in a 1-2-5 sequence
Wide Bandwidth 2 fA to 1 µA in a 1-2-5 sequence
Frequency Response (-3dB)
Low Noise 0.001 Hz F 500 Hz minimum
Wide Bandwidth 0.001 Hz F 50 kHz minimum
Impedance
Low Noise < 2.5 k @ 100 Hz
Wide Bandwidth < 250 @ 1 kHz
Noise
Low Noise 13 fA/Hz @ 500 Hz
Wide Bandwidth 130 fA/Hz @ 1 kHz
Gain Accuracy ± 2.0% typ, midband
Either Input Mode:
Max. Dynamic Reserve > 100 dB
Line Filter Filter can be set to attenuate 50/60 Hz,
100/120 Hz, or both frequency bands
Grounding BNC shields can be grounded or floated via
1 k to ground
Signal Monitor
Amplitude ±1 V FS. This is the signal after
preamplification and filtering, immediately
prior to the main ADC
Output Impedance 1 k
Reference Input
TTL Input (rear panel)
Frequency Range 0.001 Hz to 250 kHz (3.0 kHz in Dual
Reference mode with two external references)
Analog Input (front panel)
Impedance 1 M // 30 pF
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