DC measurement Part C VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 27 -
7 DC measurement
7.1 Function
♦ The DC value describes the quasi-static DC part of a signal (DC signal,
DC part of an AC/DC signal).
♦ A DC measurement is used to determine quasi-static measurements
such as GAP voltage, axial shaft position, process values, etc.
♦ The DC measurement is an optional signal path component. As a
configuration interface, it contains a group of parameters necessary for
the setting.
♦ The physical unit of the DC measurement is determined by the
preceding components in the signal path, especially the sensor / Sensor
(A/B) block.
♦ The DC value to be calculated is formed over an adjustable averaging
time. New measured values are only available each time after the
averaging time has expired.
♦ The current measured value can be displayed using the User Terminal.
♦ The current measured value is also available as an analogue DC output
signal for connection to peripheral electronic equipment.
♦ The current measured value can be read through the COM interface of
a downstream OPC-server.
♦ The DC measurement can be monitored for violation of setpoints
through one or more Monitor blocks
7.2 Parameters and setting ranges
♦ <Averaging time>
The averaging time parameter determines over which time interval the
DC measurement will calculate its value. The averaging time can be
changed within its setting range.
Setting range for the DC value averaging time:
Minimum: 0.01 ms Maximum: 99.99 ms Step size: 0.01 ms
Works pre-setting 1.00 s
Setting advice
To filter out electrical stray fields the averaging times should be set to
correspond to an integral number of the exciter period. Under some
circumstances this can improve the reproducibility of the measurement.
Typical known stray fields are to be found for example at 50/3 Hz, 50 Hz
and 60 Hz.
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