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