Graphing Meter & Lab Scope : VERUS® PRO (Pt. 9/10) | Snap-on Training Solutions®
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Welcome to Snap-on Training Solutions. This
module is designed to help you get the most out of your VERUS® PRO diagnostic tool and
covers the use of the digital and graphing meter and lab scope. The multimeter and lab
scope are powerful diagnostic tools that give you the ability to directly test vehicle components.
In automotive applications, this is typically the final step to verify a failed component
with certainty before replacing it. The Scope Multimeter icon accesses the Lab scope, Graphing
multimeter and Digital multimeter. Let’s select Digital Multimeter to explore the capabilities.
The meter includes tools for a variety of automotive applications. Never attempt to
measure more than the meter’s rated capacity. Most test connections are made with these
meter leads. One for positive and one for negative. The digital multimeter displays
a single value at a time. This is most useful when the value is not rapidly changing. To
perform an Ohm or amp measurement, the first step is to calibrate the meter to insure accurate
results. Tap Yes to confirm calibration. Select OK. Simply follow the onscreen calibration
instructions. The display will show zero ohms when the leads are connected together. When
the leads are separated, the four arrows indicate infinite ohms and an open circuit. The Graphing
meter is useful to see how a value changes over time and can reveal how a component functions,
or malfunctions, under varying conditions. The graphing meter navigation shown here is
similar for the lab scope, but the lab scope can capture very high speed signals with up
to six million data samples per second. You can select from eighteen graphing meter
tests and display options, including 4 channel Graphing Meter, Volts DC, Volts AC, Frequency,
Pulse width, Duty cycle and Dwell. Specialized scales for optional probes can accurately
graph changes and glitches in pressure, vacuum and temperature in a wide variety of automotive
applications. Current measurements require the optional precision low amp probe. This
is especially useful for finding parasitic loads, faulty injectors, pumps and relays.
Contact your Snap-on Franchisee to add these handy accessories to your tool. Let’s select
Volts DC to graph voltage change over time. Here, a constant voltage signal appears as
a flat line, with no variation or glitches over time. We can easily capture glitches
and dropouts to detect wiring issues, failing components and intermittent problems. The
meter continuously records up to 262 screens of data for review. This makes it easy to
perform a road test or a wiggle test without having to watch the meter. Pressing the pause/stop
icon freezes the data recording so you can review it. Use the double arrow icons to scroll
one screen at a time. Use the single arrow icons to scroll one data point at a time.
Or slide this scroll bar forward and back to quickly access all recorded data.
Customize the meter display with these setup tools.
The profile icons choose which channels to display. Touch once to display a channel and
again to hide it. To move a channel up or down the scale for easier viewing, touch channel
marker and slide up or down. With two channels activated, the graphing meter or the scope
can show relationships between component functions, like these two Wheel Speed Sensor signals.
Or compare two similar components to detect one that is failing. The probe menu gives
you control over the type of test used on each channel, such as volts, dwell, pulse
width, frequency, duty cycle, pressure, vacuum and amps. At six million data samples per
second, the Snap-on scope function can capture many more samples than displayed on most standard
display screens. To take advantage of this capability, select the peak detect function.
The scope samples at the maximum rate possible and captures extremely fast peaks and glitches,
like this ignition spike. Coupling AC subtracts the average value of a signal, so that small
variations display prominently on the waveform. Simply touch the Coupling AC icon to activate.
This blocks the DC portion of the signal to amplify the AC signal without driving the
waveform off of the screen. The scope trigger sets a new threshold value
that initiates the waveform display. When the voltage passes the threshold value, a
new waveform begins. This produces a very stable waveform that does not flicker or drift.
Touch the trigger icon to trigger when the voltage rises above or below the threshold
level. The trigger point appears as a plus sign on the display. Touch and drag the plus
sign to position it. Or touch Setup, Trigger for a more precise setting. Easily change
the time scale or sweep using the sweep menu. You can set the total time it takes for the
data to fill the screen, anywhere from 1 to 20 seconds in meter mode, and as short as
fifty microseconds in lab scope mode. Touch the scale value to change it anytime with
this popup menu. After making a menu selection, simply touch Back to hide the drop down menu.
The graphing meter also tracks the minimum and maximum recorded values. Selecting the
Refresh icon clears these values and the tracking starts over.
To see more detail at any time, touch the Shrink Expand Icon to hide the control settings
and expand the graphing display. Touch it again to show the control settings.
Snap-on is dedicated to helping you get the most out of your diagnostic tool and keep
your customers happy. Click here to watch the next module in this Training Solutions
series. And be sure to subscribe to our YouTube channel, so you don’t miss the next great
product from Snap-on.

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