National Instruments NI USB-9234 - Page 18

NI USB-9234 User Guide and Specifications 18 ni.com
Overvoltage protection (with respect to chassis ground)
For a signal source connected
to AI+ and AI– ................................±30 V
For a low-impedance source
connected to AI+ and AI– ...............–6 to 30 V
Input delay ..............................................3.2 ms + 38.4 f
s
Accuracy
1
Gain drift
Typical.............................................0.14 mdB/°C (16 ppm/°C)
Maximum ........................................0.45 mdB/°C (52 ppm/°C)
Offset drift
Typical.............................................19.2 mV/°C
Maximum ........................................118 mV/°C
Channel-to-channel matching
Gain
Typical......................................0.01 dB
Maximum .................................0.04 dB
Phase ( f
in
in kHz) ............................f
in
· 0.045° + 0.04 max
Passband
Frequency ........................................0.45 · f
s
Flatness (f
s
= 51.2 kS/s)...................±40 mdB
(pk-to-pk max)
1
Refer to the NI USB-9234 Circuitry section for information regarding grounded signal sources and measurement accuracy.
Measurement Conditions
Percent of Reading
(Gain Error)
Percent of Range
*
(Offset Error)
Calibrated max (–40 to 70 °C) 0.34%,
±0.03 dB
±0.14%,
7.1 mV
Calibrated typ (25 °C ±5 °C) 0.05%,
±0.005 dB
±0.006%,
0.3 mV
Uncalibrated max (–40 to 70 °C) 1.9%,
±0.16 dB
±0.27%,
13.9 mV
Uncalibrated typ (25 °C ±5 °C) 0.48%,
±0.04 dB
±0.04%,
2.3 mV
*
Range = 5.1 V
pk