Measurement Computing Personal Daq rev.6.0 - Manual (Page 23)

Personal Daq User’s Manual 878595 General Information & Specifications 2-3
Theory of Operation
Universal Serial Bus (USB)
The Universal Serial Bus is ideal for data acquisition applications. Since USB ports
(located on the PC) provide power, only one cable is needed to link an acquisition
device to the PC. In addition, USB’s high-speed data transfer (from the data acquisition
device to the PC) allows for real-time display of acquired data while eliminating the
need for additional memory in the acquisition device. USB supports transfer rates up to
12 Mbytes/sec and supports real-time data transfer. Standard USB connectors can be
identified by a USB icon.
Power Line Rejection
Personal Daq can take readings while making use of 50/60Hz line cycle rejection (120 dB). While in the
line cycle rejection mode, the maximum sample rate is as follows:
• 50 Hz rejection: 7.7 samples/sec
• 60 Hz rejection: 9.2 samples/sec