4-14 Personal DaqView
989394
Personal Daq User’s Manual
The frequency is calculated as follows:
1)
An
estimated
frequency
(
Fest
)
is calculated as follows:
•
If there were no pulses read
;
Fest = Flast
(the last frequency reported) or,
Fest = 1 / current time
(whichever is smaller)
•
If there were pulses counted then;
Fest = counted pulses / current time
2
) The
actual
reported frequency (
Frep
) is calculated as follows:
•
If current time
<AcqPeriod
then
;
Frep = [ [ Flast
*
(AcqPeriod - current time) ] + (Fest
*
current time) ] / [ AcqPeriod ]
•
Otherwise;
Frep = Fest
Note:
Current Time is the elapsed time from the start of a frequency measurement and is reset each time
the
AcqPeriod
is reached.
Digital Input/Output Spreadsheet
[Does not apply to Personal Daq/54]
The Digital Input/Output spreadsheet allows you to configure and monitor the related digital channels.
Each row shows a single channel and its configuration.
Channel Configuration Window, Selected for Digital Input/Output Spreadsheet
The following text provides more detail regarding the Digital Input/Output channel configuration
parameters. Note that columns labeled Physical Channel, User Label, On, and Reading are discussed in the
section,
Common Spreadsheet Columns
(page 4-7). The Scale and Offset feature does not apply to digital
channels.
Input/Output Column
⎯
This column identifies the digital channel mode as input or output, and is
used to select the desired mode.
Output State Column
⎯
When the output mode is selected, Personal Daq's physical internal switch
closes to ground. This 0 (Closed) switch position is the output state’s default setting. 0 (Closed) is
typically used for digital output logic applications, where logic output is low (0). In this state, digital
output is closed to ground.
When the digital output will be used to switch an external load, such as a relay, the output may be up to
+5V (hi) and Personal Daq’s internal switch should be set to 1 (Open). In this use of the digital output, the
circuit is not closed to ground.
Note that since the reading column is for input values, the applicable reading cell is shaded-out when
"output state" is selected.
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