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4.10 Setting the Comparator
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4.10.3 Comparator Operation
When the comparator function is turned on, the following operation takes
place.
It makes no difference if the larger of the two values is set in display a or b.
The two values are compared, and the larger one is made the HI limit value;
the smaller one is made the LO limit value.
(1) Operation when the two limit values are set with different values
1. When the measurement value is larger than the HI limit value, the HI lamp
lights and the HI relay turns on.
2. When the measurement value is smaller than the LO limit value, the LO
lamp lights and the LO relay turns on.
3. When the measurement value is above the LO limit value and below the HI
standard value, the IN lamp lights and the IN relay turns on.
4. When the measurement value is same as limit value, the IN lamp lights.
(2) Operation when the two limit values are set with the same value
1. When the measurement value is above the limit value, the HI lamp lights
and the HI relay turns on.
2. When the measurement value is smaller than the limit value, the LO lamp
lights and the LO relay turns on.
3. When the measurement value is same as limit value, the LO lamp lights.
(3) The comparator during averaging operation
Carries out comparator decisions using averaged data.
(4) When "o.r" or "S.Err" is displayed, the HI lamp is lit and the HI relay turns
on.
(5) In the "-----" case, the state is saved.
(6) Absolute values are used to make comparator decisions of minus
measurement values.
(7) When the external control signal COMPHOLD1 (COMPHOLD2 when on
ch2) is 0V, relay output is put on hold. In this case, the comparator does not
operate (See chapter 7, External Control Terminal and Output Terminal).
(8) Until the measurement value has been recognized by auto-ranging, the
previous state is saved.
(9) The comparator operates using displayed values, so when HOLD is active,
the state is held.
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