Fnirsi 1013D Product Instructions page 17

10: When there is a communication signal on the communication line, the oscillo-
scope will capture and display it on the screen. If it cannot capture, you need to try to
adjust the time base (1mS » 100nS) and trigger voltage (green arrow).
Infrared remote receiver measurement
Gear selection: The infrared remote control signal is generally 3 > 5V, and the 1X gear
can test up to 40V, so it is sufficient to test the car communication signal signal with
1X gear (the probe and oscilloscope are set to 1X gear).
1: First set the oscilloscope to Normal trigger mode (default is Auto trigger mode
after power on). Normal trigger mode is specially used for measuring non-periodic
digital signals. If you cannot catch non-periodic signals with Auto trigger mode,
infrared remote control signals Aperiodic digitally encoded signal
2: The oscilloscope is set to the 1X position (the default is 1X position after booting)
3: The oscilloscope is set to DC coupling mode
4: Plug in the probe and turn the switch on the probe handle to the 1X position
5: Connect the probe clip to the ground (negative pole) of the infrared receiver main
board, and connect the probe to the data pin of the infrared receiver.
6: Adjust the vertical sensitivity to 500mV
7: Time base is adjusted to 20uS
8: Adjust the trigger red arrow position to the left yellow arrow position about 1 large
grid distance
9: At this time, send a signal to the infrared receiver by remote control, and a
waveform will appear on the oscilloscope.
Amplifier circuit measurement with sensors (temperature, humidity, pressure,
Hall, etc.)
Gear selection: The sensor signal is generally weak, about a few millivolts. This small
signal cannot be detected directly by an oscilloscope. There is a signal amplification
part on the sensor motherboard. Find the output of this amplifier and the oscillo-
scope can measure This amplified signal can be set in 1X position (the probe and
oscilloscope are set to 1X position)
1: First set the oscilloscope to Auto trigger mode (default is Auto trigger mode after
power on)
2: The oscilloscope is set to the 1X position (the default is 1X position after booting)
3: The oscilloscope is set to DC coupling mode
4: Plug in the probe and turn the switch on the probe handle to the 1X position
5: Connect the probe clip to the ground of the sensor motherboard (negative power
supply), find the output of the amplified part, and connect the probe to this output
6: Adjust the vertical sensitivity to 50mV
7: The time base is adjusted to 500mS to enter the large time base slow sweep mode
8: Move the baseline to the bottom position
9: If the signal line appears at the top, you need to reduce the vertical sensitivity, when
the updated signal on the right side does not start at the top , then you can start
Detect the signal received by this sensor