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System
495
Function Card
Specs
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System
495 Back
to 495
Specifications:
Full Scale Input:
12 programmable steps provide
bipolar input ranges from 5mV to 10.24 V
Full-Scale Accuracy:
± 0.1% of FS at zero frequency
Full-Scale Stability:
± 0.02% of FS at constant temperature;
± 0.005%/° C
Input Impedance:
10 Megohms shunted by 500 pF.
Source Current:
Less than 1.0 nA at 25 oC, ± 0.1 nA/oC.
Zero Stability:
±5 uV RTI ± 1.0 mV RTO at constant
temperature; ±1.0 uV/oC RTI, ±100 uV/oC
RTO.
Noise: BW
Noise, 3 Sigma
100.00
KHz 57 uV RTI + 2 mV RTO
10.00
KHz 18 uV RTI +
2 mV RTO
1.00
KHz
6 uV RTI + 1 mV RTO
Common Mode Voltage:
± 10 Vdc peak AC operating, ± 30 V
without damage.
Common Mode Rejection: 66dB
+ gain in dB to 120dB max, dc to
60 Hz with 350-ohm source imbalance.
Filter:
6-pole Bessel filter with four programmable
cutoff frequencies. Each frequency is
determined by a plug-in resistor network
over the range of 100 Hz to 200 KHz.
Default frequencies are 10 KHz, 20 KHz,
50 KHz and 100 KHz.
Phase Coherency:
Phase shift matched channel-to-channel
within 5 degrees with amplifiers on same
gain and filter step, dc to cutoff.
Voltage Substitution Calibration: Solid state relay provided
to switch amplifier
input
terminals to common CAL bus under
program
control.
Excitation Supply Feedback: Solid
state relay provided to switch amplifier
input terminals to excitation supply sense
lines under program control.
Shunt R Calibration:
Solid state switch to apply shunt resistor
across bridge arm under program control.
Switch ON resistance less than 30 ohms.
Auto-Balance:
Auto-balance DAC outputs a voltage between
0 and the excitation supply voltage level.
Bridge Conditioner
Mode Board:
Plug on circuit board provided to mount bridge
completion, shunt R cal and balance
limit
resistors. 1, 2 and 4 arm circuits may be used
with either local or remote supply sensing.
Excitation Supply:
Output Voltage:
Programmable over the range of 0 to
10 volts with a 12-bit DAC.
Output Current:
100 mA maximum operating current;
short-circuit protected.
Output Noise:
Less than 100 uV pk-pk in 1 KHz bandwidth.
Line Regulation:
Less than 0.1% change for 10% line variation.
Load Regulation:
Less than 0.1% change from no load to full
load.
Remote Sensing: Positive
and ground sense leads are
provided
for remote sensing.
8-Input Trigger Module
Back
to 495
The 495030 Trigger module provides eight trigger input signals for the
system. Optic coupling is used to isolate all inputs from each other
and from system ground. Each input may be configured for either TTL
or high voltage AC/DC operation by means of plug-on jumper links.
Schmitt trigger gates are employed to further enhance noise immunity.
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The
Neff Advantage
