User Manual

Chapter 3: Things To Consider Before Using Your Module 25
Figure 9. Signal attenuation with 500 Hz input filter
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
-200
0 500 1000 1500 2000 2500 3000 Hz
-3 dB
131 Hz
Amplitude (in dB)
Signal Frequency
Auto-Calibration Time
Your module requires some time to auto-calibrate a channel. During this
time, your module cannot sample and convert input signals. Table 10
shows the time required for auto-calibration. When enabled, auto-
calibration occurs every 10 seconds for each channel, independently.
Table 10. Auto-calibration time per channel
(based on filter frequency)
Filter Frequency
50 Hz 60 Hz 250 Hz 500 Hz
Current Input 182 ms 152 ms 39 ms 19.6 ms
Voltage Input (-INI4vi only) 508 430 108 56
Channel Enable And
Disable Times
Your module requires some time to enable or disable a channel. During
this time, your module cannot sample and convert input signals. Table 11
shows the time required for enabling or disabling a channel.
Table 11. Channel enable and disable times.
Duration
Channel Enable Up to 6.5 ms
Enabling user-defined scaling may require an additional 0.1 ms.
Channel Disable Up to 5.5 ms