YOKOGAWA SMARTDAC+ GM, Техническая информация

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TI04L55B01-01EN
3.2.12 Log Scale Function (/LG option)
A logarithmic voltage that has been converted from a physical value is applied to the GM, and
then the GM’s Log scale (logarithmic scale) is used to display and record the physical value.

Input Type
The GM supports the following three types of input signals.
l
Logarithmic Input
This is referred to as “Log input.” It is an input in which voltages correspond to logarithmic values
of physical values.
l
Pseudo Log Input
This input supports pseudo logs.
A pseudo log signal is a voltage obtained by summing the one’s digit of the voltage representing
the exponent of the logarithmic data and the decimal digits of the voltage representing the
mantissa.
l
Input That Is Linear on a Logarithmic Scale
This is referred to as “Log linear input.” Log linear input is input in which the voltage values
correspond to the logarithmic values of physical values at each decade division (e.g., 1×10
2
) and
in which, within each decade, the voltage values correspond linearly to physical values.

Display
The trend display (Web browser) shows waveforms with the Log scale.
Digital values are displayed as exponents (e.g., 1.2E+03).

Alarms
l
Alarm Values
Alarm values can be set in the range corresponding to -5% to 105% of the span width on the
LOG scale. The mantissa range is 1.00 to 9.99 or 1.0 to 9.9 (depending on the decimal place
setting).
l
Alarm Types
You can set the following alarm types.
H: High limit, L: Low limit, T: Delay high limit, t: Delay low limit