OPERATOR’S MANUAL 92 VisionLink™ Color LabScope Table of Contents Test & Measurements Specifications ......................... 2 Inputs/Outputs ........................................................... 2 Display Information .................................................... 2 Physical Information ................................................... 2 Replacement Parts ..................................................... 2 Introduction ................................................................
Test & Measurement Specifications Sampling Rate ............... 1.6 Mhz Bandwidth ........................ 1 Mhz Time Base (Stated as Per Division) ......................................................................................50 µS / Div. to 1 S / Div. Time Base (Stated as Time on the Screen) ........................................................................................500 µS to 10 S Volts Range ...... 500mV to 100 V Max Voltage ........... +/- 100 Volts Accuracy ........... 0.
Introduction The VisionLink lapscope is the latest in labcope developments. The VisionLink is equipped with a backlit 8” Color LCD screen capable of displaying full VGA color at 640 x 480 pixels. Each of the 4 scope channels has a differential input to guard against noise and false signals. Differential leads also allow for easy measurement of vastly different signal types without damage to the engine or labscope. Simple but powerfull user interface makes this unit easy to master.
Keypad HELP Pressing the help button will show context sensitive help. This is a great way to remind yourself what functions are available. MENU Pressing the Menu button will bring up a menu to access the scope channel and display setups, or access the general scope or ignition scope Up/Down (Next to the Menu Button) Used to select the input used in the auxiliary channel (Lo Amps, Hi Amps, or Battery voltage).
Screen Layout Channel Menu The small menu at the bottom of the screen shows you the channel you have selected. Pressing the CHANNEL SELECT button will cause the green selection bar to move from channel to channel. Left Legend The legend on the left side of the displayed channel indicates the Channel Number, Voltage Range, AC or DC Coupling, and where the ground is located. The voltage range indicates the maximum range that will be displayed on the screen.
Menu The menu is a way to change the characteristics of the display, any individual channel, or select ignition or the general purpose scope. When you first press the Menu Button four selections will appear on the screen: Setup Scope Channel Setup Display General - Purpose Scope Ignition Scope Use the arrow keys to highlight the selection you want to use, then press the NEXT key to do what you have selected. Pressing the MENU button will return you to the live screen.
Trigger Modes Understanding and applying a trigger is the most powerful function of any labscope. The VisionLink supports many different and unique triggers. Make sure you take the time to apply each one and understand how each one can help you locate a problem. Only one trigger can be used at any time. Any trigger mode can be applied to any channel. None When this trigger is used, the scope is actually triggering itself continuously.
Cursors Cursors are activated whenever the hold button is pressed. Cursors are only active on the selected channel. You can use the cursors to accurately measure the voltage level and time base of any displayed waveform. Press the HOLD key to freeze the readings on the screen. Use the voltage and time base keys to move cursors around on the screen to make detailed measurements of the waveform. If it is on the screen, you can measure it! Use the NEXT key to lock one or both cursor positions on the screen.
Setup Example - Fuel Injector In this example Channel 1 is used to connect directly to a fuel injector. Make sure both the ground and sense leads for the channel have a good signal. Setup Characteristics: Channel 1 Voltage......................DC Coupled, Ground at the Bottom, 100V Time Base.......................................................................... 12 ms Trigger.......................................
Setup Example - Ignition Parade Pattern This example uses the Ignition Scope mode found in the main menu. The Lo Amps Probe is connected to the wire that supplies battery voltage to the coil pack. The ignition adapter is connected to Channel 1. The spark pickup is connected around #1 cylinder spark plug wire. Setup Characteristics: Channel 1 Voltage........................ DC Coupled, Ground in the Middle, 1.5V Time Base........................... Variable due to the trigger selection Trigger...............
Setup Example - Oxygen Sensor In this example, Channel #1 is connected to the Oxygen Sensor signal lead, and the ground lead is attached to the body of the Oxygen Sensor. Setup Characteristics: Channel 1 Voltage........................ DC Coupled, Ground in the Middle, 2.0V Time Base.................................................................10 Seconds Trigger................................................................................. None The engine was warmed up and run at about 1500 RPM.
Using the Ignition System Adapter For use on DIS systems: 1. From the main menu select, “Ignition Scope” and then press “Next”. This setting will dedicate the lower 2/3 of the display to channel 1 and the upper 1/3 to the Low Amps channel. The RPM Trigger will be active allowing you to view steady secondary voltage and primary amps parade patterns on channels 1 and 2 respectively. 2.
Tips & Techniques You will find addition information here that will help you make the best possible measurements. You do not need to spend time trying to interpret a waveform that is the result of a bad connection or noise. Setting the proper Time Base You should adjust the time base to display one full cycle of the waveform on the screen at one time.
Using Presets Scope Channel Presets: The Ferret 92 LabScope has more than 45 presets for sensor and actuator tests. Each preset includes a sample waveform that may be viewed by pressing the “Reference” key once a preset has been attached to a scope channel. Attaching a Preset: If multiple channels are active the preset will be attached to the channel highlighted in the Channel Menu at the bottom left of display. Select the desired channel and press the “Reference” key.
Installing a new Compact Flash Card To install the new compact flash card, you will need a Phillips screwdriver, the compact flash card and power for the analyzer. You can use a vehicle’s battery, or the optional AC power supply. Step 1 Remove the 4 screws holding the back panel in place. Then remove the back panel. Step 2 Locate the compact flash card and remove it. Install the new compact flash card. It will only go in one way, and takes gentle pressure to seat the card.
LabScope Basics Application: A LabScope, or Digital Storage Oscilloscope (DSO), performs only one basic function. It displays voltage over a period of time. Think of your LabScope as a voltmeter, connected to a VCR, which in turn is connected to a television. Like a voltmeter, it receives voltage inputs. Like a VCR, it records and stores the inputs. Like a Television, it displays the inputs.
Voltage generators: Conventional O2 sensors operate in a range between 0 and 1 volt. AC generating sensors vary in amplitude, but are usually under 10 volts. The scope will display up to the selected Voltage Scale level. (10 Volt setting will display from 0 volts to 10 volts) In most cases you’ll want to select a Voltage Scale slightly higher than expected voltage so the trace doesn’t range off of the display. Voltage Scale may be adjusted once the trace is on the screen, as can other settings.
Coupling: There are two coupling options, AC and DC. The best way to explain coupling is to look at the AC & DC coupling rules: 1. Pure AC voltage will be displayed the same when either AC or DC coupling is selected. See Fig. 1 (AC Coupled) & Fig. 2 (DC Coupled) 2. Pure DC voltage will be displayed with 0 volts on the ground line and positive voltage above the ground line when DC coupling is selected. See Fig. 3 3.
settings for each channel, but only the settings on the active, or highlighted channel will be used. You may move the highlight to another channel by using the Channel Select key. The time base of the highlighted channel will then apply to all channels. To activate the trigger on the highlighted channel press either Trigger key once the channel is active. Basic Waveforms Coolant Temp. Sensor: Fig. 7 is a low speed analog signal, marked by very slow voltage transitions, and is viewable in real time.
Mass Air Flow Sensor: This MAF Sensor (Fig. 11) is also a low speed analog signal marked by mixed speed voltage transitions. Although the initial voltage transition is fairly fast it is still viewable in real time. Because this signal is a lot like the TPS used in the previous example we have used the same settings with the exception of Trigger Level. Normally the same Trigger level could have been used, but this capture was from a cold engine, so idle voltage was higher than the normal of about .6 volts.
Port Fuel Injector: Fig. 16 is a capture of a typical saturated switch fuel injector. It is a high speed digital signal and is not viewable in real time. As you can see the relatively short Time Base and ground at the bottom gives maximum resolution. Time cursors were used to measure the pulse width at 2.99mS. Fig. 17 is a capture of the same injector as Fig. 16, but with a much longer Time Base allowing plenty of room for change in pulse width if we decide to snap the throttle to watch the system respond.
Analyzing Waveforms You now know the basic settings and have seen them used in examples. In the following pages we will look at a couple of captures and what they tell us about the events. TPS Sweep Test: Fig. 9 is a TPS sweep test. This test is used to look for glitches (abnormalities) that may be present at any level of throttle opening.
that the equalization only took about 80 mS to occur, so engine speed hasn’t increased much since the throttle was snapped open. Because the resistance of the throttle plate has been removed, the intake pulsation is more pronounced as engine speed is still low. Over the next 1 second you can see that air mass increases as engine speed increases.
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