Facom DX.V12 Notice D'instructions page 8

5.1 "V" MODE (VOLTMETER MODE) : MEASURE A VOLTAGE
Remember : DX.V12 in only designed for 12Volt – 24 Volt automotive circuits. Never use on a
circuit with a higher voltage than 49V.
Note : Prefer using crocodile clamps to touch points to have better result.
5.2 "V" MODE (VOLTMETER MODE) : THE LINE TEST
Line test compare the "normal" voltage measure without any charge with the
voltage during a charge. If the difference between the 2 voltages is too
important that mean there is a problem in the line. It can be a connector, a
switch, .... which introduce a serial resistance in the circuit. A line voltage with
serial resistance decrease when a charge is applied (Lamps, fan,...).
• Measure the voltage as explain in 5.1.
• When the voltage value is stable press the "Line Test" button.
When press «line test» button, if it hints «hot», means over-temperature.
Please wait for the circuit to cool down before taking another measure.
5.3 "V" MODE (VOLTMETER MODE) : PWM DETECTOR
• Press the V button to select the V mode.
• Connect the test lead to the DX.V12 terminal.
• Connect the test lead to the circuit where you need to
measure the voltage. DX.V12 show the voltage value in
Volt.
If the line is good the LCD goes green.
If a default is identified the LCD screen goes red
with an alarm.
Some of automotive actuators are driven by PWM signals
(Power Wide Modulation). Most of TURBO discharge, Idle
valve, EGR... are driven by PWM signals.