Measurement Computing WebDAQ 504, Руководство пользователя

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Table 4. Total harmonic distor on (THD) specifica ons
Input Amplitude Condi on Specifica on
Input amplitude –1 dBFS 1 kHz: –95 dB
8 kHz: –87 dB
–20 dBFS 1 kHz: –95 dB
8 kHz: –80 dB
Intermodula on
distor on
(–1 dBFS)
DIN 250 Hz/8 kHz
4:1 amplitude ra o
–80 dB
CCIF 11 kHz/12 kHz
1:1 amplitude ra o
–93 dB
Digital input/output
Table 5. Digital input/output specifica ons
Parameter Specifica on
Digital type CMOS (Schmi trigger) input / open drain output
Number of I/O One port of 4 bits
Configura on Each bit can be independently configured for input or output
Power on
condi ons
Power on reset is input mode
Pull-up
configura on
Each bit is pulled up to 5 V with a 100 kΩ resistor
Input frequency
range
DC – 10 kHz ( Note 3 )
Input high voltage
threshold
1.9 V min, 3.6 V max
Input low voltage
threshold
2.3 V max, 1.0 V min
Schmi trigger
hysteresis
0.6 V min, 1.7 V max
Input high voltage
limit
15 V max
Input low voltage
limit
–0.5 V absolute min
0 V recommended min
Output voltage
range
0 V to +5 V (no external pull up resistor)
0 V to +15 V max ( Note 4 )
Output off state
leakage current
10 µA max
Output sink
current capability
100 mA max (con nuous) per output pin
Output transistor
on-resistance
(drain to source)
1.6 Ω
Note 3: Applying a signal with a frequency higher than this specifica on will adversely affect system
performance and could cause errors.
WebDAQ 504 User's Guide
page 21