Type of Measurement
Various measurements require defining the type of signal measured.
Scheme 221
Measuring Range
Sets scale range for selected measurement.
Scheme 222
Scheme 223
Scheme 224
Scheme 225
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
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 methods 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.
Scheme 226
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.
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 between the two cursors will be displayed in the "Time value" box on the right side of the screen.
Scheme 227
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 measured 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 oscilloscope 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
Scheme 228
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. MFK 1 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
