Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur télécharger pdf (Page 18)

Use Solenoid Duty Cycle to measure mixture controlled

carburetors, or frequency output sensors such as some

pressure and air ﬂow sensors. Also use this test to check

Hall-effect switches.

The term “Duty Cycle” means the portion of time that

the signal is switched to ground, which is when power

is applied to solenoids, etc. Duty cycle should be constant within a few %, and is usually about 50%.

Hz for some sensors will vary directly with RPM. MC solenoid frequency should be constant, around 8-10

Hz. The up and down arrow keys will change the scaling of the “DUTY” reading to either: milliSeconds,

Percent ,or degrees / 60°

The upper right reading shows the longest and shortest duty. If the numbers match, the duty is steady. If

there is a difference, the signal pulse width is varying which may mean that there is active control (closed

loop), or if it should not vary it could be a defective signal source or connection.

This general purpose meter is useful for measurement

of a variety of voltages and sensor signals.

Connect the Auxiliary Meter Lead to a voltage or sensor

output. Readings are referenced to the negative vehicle

battery terminal through the analyzer’s Battery Clip leads.

The DC voltage range is 0 to ±20 volts, with 0.01 volt

resolution, and a 10 megohm input impedance. AC signals up to 50 volts peak-to-peak can be measured.

Hertz up to 999 and duty cycle % are also displayed.

This test screen shows all components of a measured signal simultaneously. The meter is quite sensitive,

so while measuring a DC voltage, you may also see stray AC signals displayed as Volt P-P and Hertz.

These stray signals can be ignored and will not interfere with measurement of an AC signal to which you

are directly connected.

For greater readability from a distance, a large digit display is available by pressing the up or down

arrow.

Auxiliary Meter

Logic Trace Scope

Use the logic trace to observe regular or intermittent

pulses on wires for accessories, sensors, lamps,

solenoids, slow computer codes, or other on/off electrical

signals. Press NEXT to adjust the scan rate. Press

SELECT to set the threshold between -20 and +20 volts

DC. Press RECORD to freeze and display a copy of a

particular trace. The copy can then be viewed without motion, separate from the live display.

The logic trace scope displays a line trace, showing voltage transitions through a speciﬁed threshold. The

actual voltages are displayed in the upper right hand corner of the display. The threshold must be set to a

voltage that is within the range of voltage change for transitions to appear, otherwise a straight line trace

will show.

Solenoid Duty Cycle Test

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Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur Page 18