Measurement Computing WebDAQ 504, Руководство пользователя

Страница: 20 / 29

matching
Gain 0.01 dB typ
0.04 dB max
Passband Frequency 0.45 × fs
Flatness (fs = 51.2
kS/s)
±40 mdB (pk-to-pk max)
Phase nonlinearity fs = 51.2 kS/s ±0.45° max
Stopband Frequency 0.55 × fs
Rejec on 100 dB
Alias-free
bandwidth
0.45 × fs
Oversample rate 64 × fs
Crosstalk 1 kHz –110 dB
CMRR fin ≤ 1 kHz 40 dB min
47 dB typ
SFDR fin = 1 kHz, –60
dBFS
120 dB
Input impedance Differen al 305 kΩ
AI– (shield) to
chassis ground
50 Ω
Note 1: If you are using an IEPE sensor, use this equa on to make sure your configura on meets the IEPE
compliance voltage range:
(Vcommon-mode + Vbias ± Vfull-scale) must be 0 to 19, where
Vcommon-mode is the common-mode voltage applied to the WebDAQ 504.
Vbias is the bias voltage of the IEPE sensor.
Vfull-scale is the full-scale voltage of the IEPE sensor.
Table 2. Measurement accuracy specifica ons
Measurement
Condi ons
Percent of Reading
(Gain Error)
Percent of Range
(Offset Error) Note 2
Calibrated Max (0
°C to
50 °C)
±0.34% (±0.03 dB) ±0.14% (±7.1 mV)
Typ (25
°C
±5 °C)
±0.07% (±0.006 dB) ±0.01% (±0.5mV)
Note 2: Range = 5.1 Vpk.
Table 3. Idle channel and noise density specifica ons
Idle Channel 51.2 kS/s 25.6 kS/s 2.048 kS/s
Noise 97 dBFS 99 dBFS 103 dBFS
50 µVrms 40 µVrms 25 µVrms
Noise density 310 nV/√Hz 350 nV/√Hz 780 nV/√Hz
WebDAQ 504 User's Guide
page 20