Measurement Computing WebDAQ 504 - Chapter 4; Specifications; Analog input

20
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 0 °C to 50 °C unless otherwise specified.
Analog input
Table 1. Analog input specifications
Parameter Condition Specification
Number of channels
4 analog input channels
ADC resolution
24 bits
Type of ADC
Delta-Sigma (with analog prefiltering)
Sampling mode
Simultaneous
Internal master timebase
(f
M
)
Frequency
13.1072 MHz
Accuracy
±50 ppm max
Data rate range (f
s
)
1.652 kS/s min
51.2 kS/s max
Data rates (f
s
) (f
M
÷ 256)/n, where n is any integer from 1 to 31
Input coupling
AC/DC; software-selectable
AC cutoff frequency
–3 dB
0.5 Hz
–0.1 dB
4.6 Hz max
Input range
±5 V
AC voltage full-scale range
±5 Vpk min
±5.1 Vpk typ
±5.2 Vpk max
Common-mode voltage
range
AI– to earth ground ±2 V max
IEPE excitation current
Automatically enabled for IEPE
channel types
2.0 mA min
2.1 mA typ
Power-on glitch
90 μA for 10 μs
IEPE compliance voltage
(Note 1)
19 V max
Overvoltage protection,
with respect to chassis
ground
Signal source connected to AI+
and AI–
±30 V
Low-impedance source
connected to AI+ and AI–
–6 V to 30 V
Input delay
(40 + 5/512)/f
s
+ 2.6 μs
Gain drift
0.14 mdB/°C (16 ppm/°C) typ
0.45 mdB/°C (52 ppm/°C) max
Offset drift
19.2 μV/°C typ
118 μV/°C max
Channel-to-channel
matching
Phase (f
in
in kHz)
f
in
× 0.045° + 0.04 max
Gain
0.01 dB typ
0.04 dB max
Passband
Frequency
0.45 × f
s
Flatness (f
s
= 51.2 kS/s)
±40 mdB (pk-to-pk max)
Phase nonlinearity
f
s
= 51.2 kS/s
±0.45° max
Stopband
Frequency
0.55 × f
s
Rejection
100 dB
Alias-free bandwidth
0.45 × f
s
Oversample rate
64 × f
s