Ethernet I/O Modules
D.
C
C
a
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n
t
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E
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T
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/
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t
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P
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T
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P
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1
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?
?
A: Yes. Based on testing by ICP DAS, a PWM output accuracy of less than 1 ms (Accuracy < 1 ms) can be
achieved for duty cycle values ranging from 5 to 15 ms, and the performance is very stable. Note that
other functions, e.g., Frequency Measurement, should not be enabled while PWM output is active as
this will reduce the PWM accuracy.
The test environment is as follows:
Operating System: Windows XP SP3
Module: tPET-P2C2
Firmware Version: v1.2.8
Measuring Instrument: Oscilloscope
The following figures illustrate the output accuracy for a range of duty cycle values from 5 to 15
ms:
Figure 1:
Duty Cycle = 5 ms
Figure 2:
Duty Cycle = 6 ms
Error =
Desired Duty Cycle (High and Low)
–
Measured delta t
=
(6ms x 2)
–
12.00 ms
=
0 ms
(< 1 ms)
Error =
Desired Duty Cycle (High and Low)
–
Measured delta t
=
(5 ms x 2)
–
10.00 ms
=
0 ms
(< 1 ms)
ICP DAS CO., LTD.
PETL/tET/tPET DIO Series User Manual, Ver. 2.1, Sep. 2014, Page: 110
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