YOKOGAWA 51001, Руководство пользователя

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Operation
1. Measure the reference luminous intensity and then press the
∆
/%
key.
The measured value at that time is retained in memory as a reference
value. This causes [
∆
, R-H] to appear and the measured range is fixed.
After that, the deviation value is displayed.
2. Press the [
∆
/%] key again to change to the percent display. This causes
[%] to appear. Each time this key is pressed, these two appear alter-
nately.
3. To confirm the reference value, keep pressing the CALL key.
4. To release, press the
∆
/% key for two seconds.
Note: If the measured value exceeds the measuring range, [OL] appears.