KYORITSU 3127 - Manual (Page 28)

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6-5-4 How DAR/ PI values are displayed
LCD shows DAR/PI values as shown below during measurements.
(1) Start of test
No DAR/PI value,
“---” is displayed.
(2) 1 min after the start of test
DAR value is displayed.
(3) 10 min after the start of test
PI value is displayed.
Press the UP/DOWN button
( ) to switch DAR and PI
values.