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System
620/600
Function Card
Specs
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Series
600 (620650, 620654) Back
to 600
Specifications:
Speed:
Program selected:100 KHz or 50 KHz.
Ranges:
Program selected; 12 binary steps:
100 KHz: ±5 mV FS to ±10.24V
50 KHz: ±0.625 mV FS to ± 10.24V.
Filter:
F 0 = 1 Hz, 10 Hz, 100 Hz and 1KHz.
620650: 2-Pole Butterworth
620654: 6-Pole Butterworth
Resolution:
16-bits (15 + sign bit).
Basic Accuracy:
± (0.02% FS + 2 uV) for 30 days at
constant temperature after automatic
calibration; includes effects of gain error,
offset, non-linearity, and non-overloading
crosstalk.
Gain Stability
± 0.002% FS/oC change from automatic
calibration temperature.
Zero Stability
± 1.0 µV/oC change from automatic
calibration temperature.
Input Configuration:
Guarded differential input on each channel;
floating or grounded signal sources measured
without degradation.
Common Mode
Voltage, Operating:
± 10 Vdc or peak ac.
Common Mode
Rejection Ratio:
120 dB max (66 dB + gain in dB + filter
attenuation), dc to 60 Hz with 350 ohm
source imbalance.
Source Current:
± (1 nA @ 23oC + 0.1 nA/oC).
Input Overload
Without Damage:
± 100 Vdc or peak ac, common mode
or normal mode.
Sample & Hold
(620654 preamp only):
Acquisition Time:
30 uS.
Droop (Hold Mode ):
0.5 mV/mS.
Aperture Uncertainty:
100 nS, max.
Noise:
Total Noise RTI = [(N1)2 + (N2)2]1/2
/A
where N1 = RTI noise; N2 = RTO noise;
A = system gain = 10.24 V/FS Range.
Noise specifications are 3 Sigma limit, peak-to-peak.
f0
N1
N2
1Hz
1uV
2500uV
10Hz
1uV
2500uV
100Hz
2uV
2500uV
1KHz
6uV
2500uV
Offset:
Included in basic accuracy specification.
Static Crosstalk:
Included in basic accuracy specification.
Crosstalk (Adjacent
Channel Overload):
±0.02% FS (only affects channel following
overloaded channel in scan list).
Non-Linearity:
Included in basic accuracy specification.
Automatic Calibration:
On command, uP adjusts zero and gain of each
channel to within basic accuracy specification
and verifies calibration.
Analog Output:
Unfiltered (wideband) output at ±5 mA from each
preamp; available at rear panel.
Control/Display Panel:
32-character alphanumeric display and
keypad for entering instructions.
Autorange (50 KHz only): Post amplifier provides
autorange over a
1-to-32 gain range in six steps. Combined
with preamp gain, the following ranges are
available:
Preamp Gain
Autoranges
512
±0.625 mV to ±20 mV
64
±5 mV to ±160 mV
8
±40 mV to ±1.28 V
1
±320 mV to ±10.24 V
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The
Neff Advantage
