DAQ VXI-SC-1102 Manual de Instruções Página 117

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Chapter 19 NI 40XX Devices
DAQ Hardware Overview Guide 19-2 www.ni.com
You can measure diode drops of up to 2 V in the diode mode on both 4050
and 4060 devices. On the NI 4050 device, you can also measure AC and DC
current by using the optional current shunt accessories.
NI 40
XX
Data Acquisition
The NI 4050 device can perform single-channel data acquisition. Before
you make an acquisition, you must select the mode, range, and notch filter
frequency. On the 4060, you may also select whether to perform offset
compensation with the measurement and how many conversions to average
per measurement.
NI 40
XX
Data Acquisition Filtering and Timing
NI 40XX devices have three notch filter frequencies:10, 50, and 60 Hz. The
device filters out noise at harmonics of its notch frequency. Table 19-1
shows available notch filter frequencies and common power line
frequencies filtered at these frequencies.
The reading rate on the 4050 and 4060 devices varies with notch filter
frequency settings, as shown in Table 19-2.
Table 19-1.
Relationship between Notch Filter Frequency and Power Line
Frequencies Filtered
Notch Filter Frequency (Hz)
Common Power Line
Frequencies Filtered (Hz)
10 10, 50, 60, 400
50 50, 400
60 60
Table 19-2.
Relationship between Notch Filter Frequency and Single-Channel
Acquisition Rate
Notch Filter Frequency (Hz)
Single-Channel Acquisition
Rate (S/s)
10 10
50 50
60 60
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