Yokogawa Button Operated DX2000 - Manual (Page 7)

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2.3. Alarm
Alarm types in LOG input mode
¾ H, L, T, and t only.
Set the alarm value using a voltage.
Computing method of alarm values
¾ Computing equation of the digital display value
From Y = 10 (SU-SL)*(X-VL)/(VU-VL)+SL
logY = (SU-SL)*(X-VL)/(VU-VL)+SL
X = (logY-SL)*(VU-VL)/(SU-SL)+VL
¾ For a computation example, see Table 2-2.
Alarm hysteresis fixed to 0%.
¾ The alarm hysteresis settings specified in the basic setting mode for the
measurement channel are invalid.
Table 2-2 Computation Example of Alarm Values
Alarm Value Span
Lower
Span
Upper
Lower Limit
of Exponent
Upper Limit of
Exponent Equivalent
Display
Voltage
Equivalent
1 5 2 8 5.0E+6 4.133
1 5 2 8 1.0E+6 3.667