Appendix A, SPECIFICATIONS
A-2
Current Input
Mode Low Noise (10
8
V/A) or Wide B/W (10
6
V/A)
Full-scale Sensitivity
Low Noise 10 fA to 10 nA in a 1-2-5 sequence
Wide Bandwidth 10 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 Signal
Frequency Range 0.001 Hz to 120 or 250 kHz (Front panel input)
Frequency Range 0.001 Hz to 3.0 kHz (Rear panel TRIG IN
input)
Analog Signal
Impedance 1 M // 30 pF
Sinusoidal Input
Level 1.0 V rms
Frequency Range 0.3 Hz to 120 or 250 kHz
Squarewave Input
Level 250 mV rms
Frequency Range 2 Hz to 120 or 250 kHz
Reference Channel
Phase Set Resolution 0.001º increments
Phase Noise at 100 ms TC, 12 dB/octave slope
Internal Reference < 0.0001º rms
External Reference < 0.01º rms @ 1 kHz
Orthogonality 90º ±0.0001º
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