Measuring Diodes (Diode Tester) - Facom 714 Guía De Instrucciones

CHARACTERISTICS OF MEASUREMENTS ON LAMBDA PROBE
Function
Digital display range
Operating domain (note 2)
Intrinsic error (note 1)
Digital resolution
Number of bargraph segments
Bargraph operating domain
Bargraph accuracy
Bargraph resolution
Bargraph operating frequency
Note 1: The accuracy specified does not take into consideration the LAMBDA probe.
Note 2: Beyond 3.5V average value, the display shows "+OL".
For a negative average voltage, the display indicates
1
3
0,2 V
0,00 V
Measuring the diode test «
• Connect the measurement cords to the tester terminals.
• Set the rotating switch to the "Ω" position.
• Press the yellow key twice to select the "
• Connect the tester to the junction to measure.
Although associated with resistance measurements, this test measures a voltage drop over a 4V
range.
In case of a short circuit (display below 50 points, i.e. 50 mV), the buzzer sounds, indicating a
faulty tested junction.
If the junction is offline or if the voltage drops by more than 3.5V, the display indicates OL.
The measurement current flows from the "+" terminal to the "COM" terminal. Hence, measuring
on a diode in the direct direction triggers a display of about 0.6V for a silicon junction, or
0.25V for a germanium junction. As measurement is possible up to 3.5V, junction assemblies
can be tested, such as thyristors or high voltage diodes, or certain light-emitting diodes.
Maintenance
Before any maintenance operation, check that no element is connected to the tester.
Cleaning the set
Clean the tester with a cloth slightly damped with soapy water, and rinse with a cloth damped
with clear water. Never pour water onto the tester.
Dry using a dry cloth or with pulsed air (max temperature +70°C).
Calibration check
Annual checking of the measurement specifications by a certified body.
22
At idle running, i.e. about 1000 rev/min,
the voltage must exceed 0.4V. The
bargraph shows a beating between
0.2V and 0.8V.
0,8 V = OK
0,39 V
»
" function.
''λ'' probe
4 V
0,000 - 3,500 V
1%+2 pt
1 mV
37
0 -1,2 V
± 1 segment
33 mV
0,5 to 2 Hz
.
2
4