28
26
k.
Logic Test
The logic state of IC’s can easily be determined with the 440.
Use the function buttons to select TTL, 3V CMOS or 5V CMOS
logic chips. The 440 will display high and low logic levels.
TTL
3V
5V
CMOS
CMOS
F1
F2
F3
F4
F5
This function is designed to check the HI/LOW logic states of
IC’s and circuits by direction of the arrow on the LCD. For TTL
circuits, the arrow will point downward at or below 2.9 volts
and upward at or above 3.2 volts. For 3V CMOS the arrow will
point downward at or below 1.7 volts and upward at or above
2.0 volts. For 5V CMOS the arrow will point downward at or
below 3.1 volts and upwards at or above 3.4 volts. When the
BZ is also activated, the 440 buzzer will sound when HI logic
levels are measured.
Summary of Contents for Scope Plus 400
Page 1: ...Scope Plus Instruction Manual 440 ...
Page 2: ......