PicoLog Self-Help Guide
AR346-1
© Copyright 2014 Pico Technology Ltd.
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14.
PicoLog frequency measurement
You can use PicoLog with the PicoLog 1000 Series (and certain oscilloscopes, see below)
to measure AC volts, dB and frequency, presenting the values as a graph (Real time
Continuous mode only). Our other data loggers are too slow to be useful for frequency
measurements.
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First, go to File > New Settings and select Real Time Continuous, then click OK.
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Select a sampling time of 1 second to take a reading once per second.
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Select the total number of samples or the total time of recording and click OK.
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Select PicoLog 1012/1216 and click OK.
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In PicoLog1216 measurements, click Add.
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In Edit PicoLog1216 Measurement, enter a name for the channel.
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Select Channel 1.
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For Measurement, select Frequency.
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Set the scan time to 100 000 µs, which will give you a frequency range of 20 Hz to
11.626 kHz.
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Using Options and then Scaling you can get PicoLog to display in RPM, not frequency
(click Help for instructions).
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Back in Edit PicoLog1216 Measurement, click OK.
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Back in PicoLog1216 measurements, click OK.
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Channel 1 should now be reading in Hz (or RPM if set).
To get frequency measurements for PicoLog at less than 1 second intervals (say 100 ms)
you need to modify your plw.ini file. This will be located in the following directory for
Windows XP:
C:\Documents and Settings\USER_LOGIN\Local Settings\Application Data\Pico
Technology\42f31349-afb8-471d-8a4d4fb7672be39b\
where USER_LOGIN is your user account. (You will need to enable viewing of "Hidden
Folders").
The equivalent folder in Windows Vista/7/8 is:-
C:\Users\<Your user name>\AppData\Local\Pico Technology42f31349-afb8-
471d-8a4d4fb7672be39b\
Open plw.ini in Notepad or a similar text editor and add the following line:-
QuickSampleMs=100
under the section labelled:-
[Preferences]