Keithley KUSB-3100, User Manual

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Programming Flowcharts
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Frequency Measurement Operations
The following flowchart shows the steps required to perform a
frequency measurement operation using the Windows timer. If you
need more accuracy the Windows timer provides, refer to
page 23 of
this manual or to your DataAcq SDK User’s Manual for more
information.
Get a handle to the C/T subsystem with
olDaGetDASS .
Initialize the device driver and get the
device handle with olDaInitialize .
Specify the mode as OL_CTMODE_
COUNT using olDaSetCTMode .
Go to the next page.
Specify C/T subsystem/element 0.
Specify the clock source as
OL_CLK_EXTERNAL using
olDaSetClockSource .
Specify a clock divider between 2 (the
default) and 65536.
Specify the clock divider using
olDaSetExternalClockDivider
Attach an external C/T with a maximum
recommended frequency of 6 MHz to
the Counter 0 In signal.
Specify the gate type as high-level
(OL_GATE_HIGH_LEVEL) or software
(OL_GATE_NONE) using
olDaSetGateType .