3-5
TI04L55B01-01EN
A/D Integration Time
The GM uses an A/D converter to convert sampled analog signals to digital signals. By setting
the integration time of the A/D converter to match the time period corresponding to one cycle of
the power supply or an integer multiple of one cycle, the power supply frequency noise can be
effectively eliminated.
Common (36.67 ms/100 ms) can specified to effectively eliminate power supply frequency noise
for both 50 Hz and 60 Hz.
Note that the selectable A/D integration times vary depending on the scan interval settings.
Integration Time
Explanation
Auto
The GM automatically detects the power supply frequency and sets the integration time
to 16.67 ms for 60 Hz and 20 ms for 50 Hz.
However, if the module operation mode is 10ch and the scan interval is 100 ms or 200
ms, the A/D integration time is fixed at 1.67 ms.
50Hz
Sets the integration time to 20 ms.
60Hz
Sets the integration time to 16.67 ms.
Common
Sets the integration time to 16.67 ms, 20 ms, 36.67 ms, or 100 ms.
Integration time and scan interval by module
Type
Integration Time
Scan Interval
10ch mode
2ch mode
Universal,
DC current input
High withstand voltage
36.67 ms
1s
100 ms
2 s or 5 s
Electromagnetic relay
16.67 ms/20 ms
1s
—
36.67 ms
2s
—
100 ms
5s
—
Low withstand voltage relay
36.67 ms
2s
—
100 ms
5s
—
Measurement Mode
By switching the measurement mode according to the measurement target and measurement
conditions, you can perform high-speed measurements as well as simultaneous high-speed and
low-speed measurements.
l
H
igh-speed measurement at the shortest measurement interval of 1 ms
Measurement at the shortest interval of 1 ms is possible by using a high-speed analog input
module equipped with an original A/D converter developed by YOKOGAWA.
l
D
ual interval measurement
Two different scan intervals can be used together in a single system. Slow changing signals
such as temperature and fast changing signals such as pressure and vibration can be measured
simultaneously and efficiently. Scan groups are specified on each module.
3
Functions
Summary of Contents for SMARTDAC+ GM
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