For VOLTS CURSORS,
Reading Test Results on the SCOPE (Component Tests only) Display
Measurement results can be displayed as numeric values (referred to as readings) and waveform. The t ypes of
readings depend on the test taking place.
For example, during a O2S SENSOR (Zirc) test, MAXIMUM and MINIMUM values are displayed as readings and
during a DUAL O2 SENSOR test MAXIMUM and MINIMUM values of the signals from the oxygen sensor before and
after the catalytic converter are displayed as readings. During a DI SECONDARY test, SPARK VOLTAGE, RPM,
BURN TIME, and BURN VOLTAGE are displayed as readings.
The values you see on the display most often depend on the vehicle under test. Refer to the Service Manual of the
vehicle manufacturer.
In Chapter 6 “Automotive Diagnostics & Applications” you can find typical results of certain applications.
5.3 GMM DISPLAYS
The instrument performs cycle by cycle measurements of a variety of signal characteristics in Real Time and plots
them as t hey change with time as a graph. The instrument also perf orms certain other measurements on a
continuous basis, delivering the results for graphing 20 times per second. You can also plot the input signal directly
(as in SCOPE mode) by choosing LIVE.
The GMM display includes a meter reading showing the current value of the graphed parameter. This reading is an
average over many result values. In some cases, measurements are the maximum or minimum of a series of signal
values over the most recent 1 second interval.
The following table shows measurements which can be plotted in GMM displays and the type of graphing and
readout.
5-7
VOLTS 1 DELTA VOLTS 2
2.4 V
7.2 V
9.8 V
VOLTS 1 DELTA VOLTS 2
A: 130 mV
520 mV 650 mV
B: 24.0 mV
74 mV 98.0 mV
Sample value a t
VO LTS CURSO R
2 posit io n o n t he
waveform.
Samp le va lue at
CURSOR 2 position
on th e I NPUT B
waveform.
Volts difference between CURSOR 1
an d CUR SOR 2 posit ion on t he
INPUT B waveform.
Sa mple value at
CURSOR 1 position
o n t he I NPUT B
waveform.
Samp le va lue at
CURSOR 2 position
on th e I NPUT A
waveform.
Volts dif fer en ce b etw een C URSO R 1 a nd
CURSOR 2 positions on the INPUT A waveform.
Samp le va lue at
CURSOR 1 position
on th e I NPUT A
waveform.
Sa mple valu e at
VOLTS CURSOR 1
p osition on t he
waveform.
Volts difference between CURSOR 1
and CURSOR 2 positions.
Cursor Key Function
A cursor is a vertical line or a horizontal line placed over the displayed waveform to measure values at certain points.
The instrument can measure signal details by using Cursors. This function is not possible for all tests.
Press CURSOR ( ) to display the Function key Menu for cursor operation.
If cursor operation is not possible for the actual measurement, the instrument beeps to alert you.
Two cursors (vertical lines) appear on the display.
The left cursor is named CURSOR 1, the right CURSOR 2.
• Press to set TIME cursor or VOLTS cursor or cursor OFF.
• Press to select the cursor you want to move (1 or 2).
• Use the Four Way arrow keys to move the cursors.
The top display shows readings related to values at the cursor positions.
For TIME cursors,
5-6
TIME 1 DELTA TIME 2
20.4 ms
48.1 ms 68.5 ms
Sample value at TIME CURSOR 2
position on the waveform(s).
Samp le va lu e at TIME CURSOR
1 position on the waveform(s).
Time difference between TIME CURSOR 1
and TIME CURSOR 2 positions.
CURSORS
CURSOR KEYS
BACK
TIME
CURSOR 1
CURSOR ( )
