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Appendix A, SPECIFICATIONS
Reference Channel
A-2
Current Input
Mode
Full-scale Sensitivity
Low Noise
Wide Bandwidth
Dynamic Reserve
Frequency Response
Low Noise
Wide Bandwidth
Impedance
Low Noise
Wide Bandwidth
Noise
Low Noise
Wide Bandwidth
Gain Accuracy (midband)
Low Noise
Wide Bandwidth
Line Filter
Grounding
TTL Input (rear panel)
Frequency Range
Analog Input (front panel)
Impedance
Sinusoidal Input
Level
Frequency Range
Squarewave Input
Level
Frequency Range
Phase
Set Resolution
Accuracy
Noise at 100 ms TC, 12 dB/octave
Internal Reference
External Reference
Low Noise or Wide Bandwidth
20 fA to 10 nA in a 1-2-5 sequence
20 fA to 1 µA in a 1-2-5 sequence
> 100 dB (with no signal filters)
-3 dB at 500 Hz
-3 dB at 50 kHz
< 2.5 kΩ at 100 Hz
< 250 Ω at 1 kHz
13 fA/√Hz at 500 Hz
130 fA/√Hz at 1 kHz
≤ 0.6 % typ
≤ 0.6 % typ
attenuates 50, 60, 100, 120 Hz
BNC shields can be grounded or floated via
1 kΩ to ground
1 mHz to 120 kHz
1 MΩ // 30 pF
1.0 V rms**
1 Hz to 120 kHz
100 mV rms**
300 mHz to 120 kHz
**Note: Lower levels can be used with the
analog input at the expense of increased phase
errors.
0.01º increments
0.5º typ
< 0.0001º rms
< 0.01º rms at 1 kHz
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