Yudian AI-5500 - Keypad Functions Part 1; Key 1 Functions (Unit Switch, Menu Settings); Key 2 Functions (Math Mode, Cancel); Key 2 Math Mode Details (REL, MAX, MIN, AVG)

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Auto.b.L is no less than zero, and buzzer sound is not allowed when Auto.b.L is
less than zero.
(3) Key 1: in the measuring state, briefly press “Key 1” to switch display unit;
press “Key 1” and hold it for 2 seconds to realize the “Set” function and enter
menu settings. See Chapter 6 “Menu Settings” for details.
(4) Key 2:
1) In the measuring state, briefly press “Key 2” to select mathematic
measurement functions: The functions can be switched in the eight states of
“basic measurement values- REL-MAX-MIN-AVG- PP-s-n”. In which,
a) When no any “REL-MAX-MIN-AVG- PP-SN” signs appear, the value is
the current measurement value.
b) REL is relative measurement value. It is similar to “manual zeroing”,
subtracting the “reference value” from the current value, i.e. the REL value =
current measurement value x
i
–reference value. The “reference value” is the
measurement value in the beginning of star-up, or the measurement vale in
the beginning of altering input tyPE, or the measurement value in the
moment of pressing “Cancel”.
c) MAX is the maximum measurement value. It is the maximum
measurement value since start-up (or after pressing “Cancel”).
d) MIN is the minimum measurement value. It is the minimum measurement
value since start-up (or after pressing “Cancel”).
e) AVG is the average measurement value. It is the average value since