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Lead Contents

Photomicro Sensor: Check Control Output is Operating Properly

FAQ No. FAQ01162

Primary Contents

Question

Is there an easy way to check whether the control output of the Photomicro Sensors is operating properly?

Answer

The operation can be easily checked with the following procedure using a tester.

Output method and checking procedureDetermination procedure
NPN open-collector output
A resistor is inserted between
and OUT, and the voltage
between OUT and is measured
using a tester.

R: Approx. 4.7 kΩ, 1/2W
The control output is operating property it the
measurement voltage changes to low and high
by the lighting turning ON or OFF. (See note.)
Output statusText measurement voltage
NPN collector load built-in
voltage output
The voltage between OUT and
is measured using a tester.

R: Approx. 4.7 kΩ, 1/2W
Output transistor
ON
L: 1 V max.
(residual output voltage)
PNP open-collector output
A resistor is inserted between
OUT and and the voltage
between and OUT is measured
using a tester.

R: Approx. 4.7 kΩ, 1/2W
Output transistor
OFF
H: Power supply voltage


Note:This is a simple check that determines only whether the control output is malfunctioning.