Table of Contents

BMW Measurement System

Subject Page

BMW Measurement System.3

Multimeter Function .4

Test Connections .4

Type of Measurement .5

Measuring Range .5

Special Functions.5

Counter .6

Oscilloscope Function .7

Oscilloscope Display Screen Features.8

Cursor 1 and 2 .8

Zoom.9

Memory .9

Preset Measurements.9

Output Stimulator .10

Initial Print Date: 2/06 Revision Date:

BMW Measurement System

Model: All
Production: All

After completion of this module you will be able to:

• Recognize the measurement capabilities under Measurement System.

• Understand the different Measurement System displays and buttons.

• Stimulate an output.

2

BMW Measurement System

BMW Measurement System

Measurement Pressing the Measurement system button from the DIS start screen
system or change menu will call up the Multimeter function.

The following programs are available through the multimeter function buttons along the
bottom edge of the screen:

Multimeter

For measurement of voltage, amperage, resistance, temperature, pressure,
and diode testing.

Counter

For measurement of frequency, period and duty cycle.

Oscilloscope

setting

Digital dual trace scope for measuring wave forms.

Stimulators

Uses the DISplus multimeter leads as a signal source for DC V AC voltage,
pulsed signal generation, resistance, and a power switch.

Preset Pre-arranged tests that are used to test the most commonly monitored

measurements vehicle signals.

3

BMW Measurement System

Multimeter Function

Multimeter

All of the multimeter functions are displayed in the display area of the
screen. Both numerical and bar-graph test results are shown.

Select func¬
tion of multi¬
meter

Select leads
being used

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Select DC, AC, or RMS
Select Range

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Freezes the Screen

Captures Highest &
Lowest Readings

Displays Vehicle
Voltage and RPM

Displays Two
Measurements

Activates

Stimulation Feature

Test Connections

Multifunction Cable 1 is used to test all multimeter functions not requir¬
ing special sensors. MFK 1 is used to measure:

• Voltage - up to 50 Volts

• Resistance

• Frequency

• Duty Cycle

Multifunction Cable 2

MFK 2 is used to measure:

• Voltage - up to 500 Volts

• Frequency

• Period

Current - up to 2 Amps
Diode Testing
Period

Pulse Duration

Duty Cycle
Pulse Duration

4

BMW Measurement System

Current probe

When selecting the 50 A or 1000A current measurement function, the current
probe will be the default test connection. The current probe is self calibrating.

Pressure

sensor

Temperature

sensor

When selecting the pressure measurement function, the pressure sensor will
be the default test connection. The reading will begin at approximately 1 Bar
(the reading cannot be zeroed).

When selecting the temperature measurement function, the temperature
sensor will be the default test connection. The reading is only provided in
degrees Celsius.

Type of Measurement

Various measurements reguire defining the type of signal measured.

DC: Set to test a direct current signal.

AC: Set to test for an alternating current signal.

Effective value

Displays a measured AC wave form as the RMS (root-mean-sguare) value.
The RMS value is the DC equivalent of the voltage or current produced by an
AC wave form.

Measuring Range

Sets scale range for selected measurement.

automatic

Scale will automatically range to the best suitable range.

+/- 200mV

Arrows are provided for the user to manually set range of measurement.

Special Functions

Hold screen

Freezes the display with the current test results. Serves the same function as
the buttons on the large MFK1 and 2 test leads.

Minimum/ The current measured value is constantly monitored. The highest and lowest

Maximum measured value since the activation of the function is displayed below the

I actual display.

5

BMW Measurement System

System voltage and engine speed adds an additional field to the display
that measures system voltage and engine RPM along with the original
measurement. This feature requires that the TD cable and diagnostic
head be connected.

2nd 2nd measurement splits the main display field into two separate dis-

measurement plays. This permits two measurements from separate test leads to be
-1 displayed at the same time.

System voltage
Engine speed

Stimulate

Stimulate allows the user to turn on or off the stimulate output function
while in the multimeter. This is useful when applying an output signal to a
vehicle circuit for testing purposes.

Counter

Number of
pulses per
second

Length of time
of one complete
cycle in
milliseconds

Length of time the
pulse is active
(On Segment) in
milliseconds

% of time pulse
is active during
full cycle of wave

Lead Selection

Range

Adjustment

Adjusts

Sensitivity

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Freezes the Screen

Captures Highest &
Lowest Readings

Displays Vehicle
Voltage and RPM

Displays Two
Measurements

Activates

Stimulation Feature

The counter function of the DISplus measurement system allows the user to measure
time based signals. The measurements are:

• Frequency

• Period

• Pulse duration

• Pulse duty factor

6

BMW Measurement System

The desired measurement is set-up from the screen by selecting from the following:

• Measurement function

• Test cable

• Measurement range

• Trigger level (default is set at 5 Volts)

• Trigger slope (determines which portion of the signal will be used as the trigger point)

Oscilloscope Function

The oscilloscope function uses a digital dual trace display screen. There are two meth¬
ods for setting up the scope to display a pattern: manual setup or preset measurements.

The oscilloscope setting screen is used to manually select how the measured signal will
be displayed.

Channel A is displayed in yellow Channel B is displayed in green

on the screen. Leads available on the screen. Leads available

are displayed here. are displayed here.

Channel A
measurement
type

Channel A
range

Frequency

range

lower Hz=
longer time display

higher Hz =
shorter time display

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Channel A

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Channel B range

Writer mode
enables use of
scope on high
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Selects trigger
source

Once the settings are complete and the test connections are made the oscilloscope
graph may be viewed by selecting the “Oscilloscope display” button.

The oscilloscope signal pattern may be adjusted by manipulating the voltage level and
the trigger level (voltage) from within the display screen. If the displayed pattern is still
unreadable or incorrectly setup, the oscilloscope settings can be further adjusted by
returning to the settings screen.

7

BMW Measurement System

Oscilloscope Display Screen Features

Once the signal pattern is displayed, the pattern may be locked on the screen with the
“Hold screen” button or with the freeze image buttons on the test cable leads.

Holding the image will activate the “Cursor”, “Zoom” and “Memory” features. Holding
the image also allows the signal pattern to be visible when printing the screen.

■ Cursor 1 and 2

This feature is used to measure the amplitude and time differential of the signal pattern.
Activate the feature by pressing the “Cursor 1 ” button first. A vertical line will appear.
Roughly position the line by touching the desired measurement point on the screen.

Anywhere the cursor line intersects the signal pattern, the amplitude value at that point
will be displayed in a box on the right of the display screen. If both traces of the scope
are being used, (both channel A and B) each value will be shown in its own box. A fine
adjustment may be made to the cursor line by using the arrow buttons to the left and
right of the cursor buttons.

The time differential between two points may be measured if “Cursor 2” is used. Place
the second cursor at the desired measurement point. The time difference value between
the two cursors will be displayed in the “Time difference” box on the right side of the

screen.

With freeze image selected,
press memory. Use the arrow
keys to scroll back up to seven
screenshots.

Adjust to within voltage level of
monitored signal to keep wave
from “walking” on the screen.

“Freezes” waveform on
screen for measurement
display in conjunction
with cursor buttons or
zoom function.

With freeze
image selected,
use cursor but¬
tons to mark
measuring
points on the
wave form.
Use finger on
the pattern to
set approximate
position and
use the arrows
to locate exact
position.

Time scale
of waveform
(changes
based on
scope settings
- frequency).

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Displays sec¬
ond channel
(ex. MFK2)

After pressing
freeze, the dis¬
play can be
enlarged (ampli¬
tude does not
change).

Amplitude val¬
ues displayed.

Displays time
value of marked
portion of wave.

Adjusts vertical position of waveform on Activates stimulation
screen by adjusting baseline position. feature.

8

BMW Measurement System

■ Zoom

By selecting the “Zoom” button, a section of the signal pattern may be enlarged to show
greater detail. The desired section of the display is called up by touching the screen at
the desired spot.

Memory

Memory pages are stored every time the Hold Screen is activated. The DISplus stores
the last 10 trigger pulses at the time the screen is held. To recall the memory pages,
press the “Memory” button and use the left arrow button to scroll through the previous
9 pages (page 10 is already displayed). The cursor and zoom features may be used on
the stored pages.

Preset Measurements

The preset measurements provide an easy method of testing several commonly mea¬
sured signals. To enter the presets: Press the “Preset measurements” button on the
bottom of the screen. A pop up window will provide several signals to choose from.
Selecting the signal and pressing the OK button will automatically configure the oscillo¬
scope to the settings needed to provide the best trace pattern. Many tests also have
specialized boxes with additional readings( i.e RPM, system voltage).

For instructions on which cables to use for the preset test, follow the instructions
in the “Preset measurements” selection of the “Help” menu.

Since the oscilloscope settings are pre-determined, no changes to the oscilloscope
are possible.

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Signal Tests

• Wire Tests

• Potentiometer Tests

Signal Measurements

Status Diagnostic Socket
Status of OBD Socket
Engine speed sensor signal
TD signal
ti injection signal
Ignition signal, primary (terminal 1
signal)

Ignition signal, secondary
Diesel NBF signal
Diesel Engine speed sensor Signal
Terminal 4a signal
Oxygen sensor (Lambda) signal
Idle actuator signals
Throttle valve potentiometer signal
Camshaft sensor signal

Further measurements

Alternator test
Absolute compression
Relative compression
Pressure distribution
Smooth running
Xenon Headlight test up to 8/98
Xenon Headlight test from 9/98

9

BMW Measurement System

Output Stimulator

The stimulation function of the multimeter can be used to provide an output signal from
the DISplus to test various components or vehicle wiring. MFK1 and the small leads of
MFK 2 are used to conduct the output signal. After selecting the cable, press the
Stimulate button in the right lower corner to activate.

The following signal types may be simulated with this function:

• DC Voltage from 0 to 15 Volts

• AC Voltage from 1 Hz to 1 KHz and 0 to 15 Volts

• Digital frequency from 1 Hz to 5KHZ and 0 to 100% duty cycle

• Resistance from 0 to 10Kohm (MFK 1 only)

• DC voltage using on/off switch

Determines the type of output signal required

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10

BMW Measurement System