Programming Examples 43
SR620 Universal Time Interval Counter
PROGRAMMING EXAMPLES
THROUGHPUT
The actual time required to make a measurement of N samples is given by the equation:
T = N x ( measured time in calculation time
The sample time, Tsample, is given in the table below:
TIME, WIDTH, Tr/Tf
750us
FREQ,
PERIOD
2600us
GRAPHS
"ON"
+200us
ASCII
RESPONSES
+250us
So, when measuring short time intervals with graphs on and not in the binary dump mode, the SR620 has a
throughput of about 1000 samples per second.
There is some additional time required at the end of each group of measurements. This calculation time is
zero ( no graphic displays, binary responses) or 5 ms ( no graphic displays, ASCII responses) or 8 ms (active
chart outputs or scope display of mean or jitter) to 50 ms (scope display of histogram). If the SAMPLE SIZE is
greater than one, then statistics will be calculated, which will add 10-100 ms to the calculation time,
depending on the number of digits in the MEAN value.
The data acquisition rate to a computer will depend on the interface which is used and the speed of the
computer and its interface drivers. About 1400 measurements per second may be transferred to a computer
using a DMA (Direct Memory Access) GPIB controller to measure time intervals in the binary dump mode.
Содержание SR620
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