Preparation of the device and computer for use in an automotive service center
Warning!
- The Computer must be grounded. Grounding is necessary to safely shunt any possible high voltage to ground. High voltage from, for example, the ignition system could find its way in to the device should an ignition system wire experience insulation break down. Without a protective ground, this could damage the computer and/or the oscilloscope.
- The grounding plug for the USB Autoscope III should be connected to the case of the host computer using a separate multi stranded copper wire with a cross section of at least 0,5mm2.
- Black "crocodile" clip of the alarm, power feed wires, oscilloscope probes, and all adapters used for measurements should be connected to vehicle ground at ONE POINT on the engine.
- Red "crocodiles" clip for the power feed for the probes and adapters used for measurements should be connected to the positive battery terminal of the diagnosed car.
- Be sure to route any and all wiring away from high voltage wiring, rotating engine parts and hot exhaust system parts during testing.
- The USB Autoscope III should not be any closer than 0.5 meters from any ignition system wiring.
Minimum PC hardware requirements:
- CPU - Pentium III - 1 000 MHz;
- RAM - 128 Mb;
- A hard disk - 10 GB UDMA 66;
- A CD-ROM drive for software installation;
- Equipped with a USB 1.1 or USB 2.0 port;
- Video adapter AGP SVGA;
- OS type Windows 98SE/Me, Windows 2000/XP or Windows Vista.
The hard drive must support DMA.
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Installation of the program and drivers.
- To install the software insert into the CD-ROM drive the install CD. The installation of the software will be automatically started. If autostart of CD on your computer is disabled, it will be necessary to start manually "Setup.exe" file on the install disk to begin installations of the software.
- When the USB Autoscope III is connected to a USB port of a computer, "The hardware wizard" should start automatically and offer automatic search for a suitable driver for the found new equipment. Should a window with the message: "The Software to be installed for USB Oscilloscope Board v*.* was not tested for compatibility with Windows XP" it will be necessary to press the "OK" button, the driver will then be installed and the message "Installation complete" will appear.
- To start the program USB Oscilloscope.
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Calibration of the device.
The device usually does not require calibration.
If necessary, it is possible to calibrate the analog inputs.
Zero calibration of the analog inputs 1-6.
- This is done with the USB Autoscope III in single-channel analog mode;
- In the adjustment panel, choose analog input number 1;
- Connect the channel 1 input lead to the input ground lead;
- Select "Control" in item "Adjust channels" the "Analog input 1";
- Type in line "Offset [ADC steps]" the value that was shown by the multimeter for this channel;
- The value should be 0mV (+/-8mV);
- Repeat items 2-6 for the remaining analog inputs 2-6.
Calibration of the sensitivity of analog inputs 1-6.
- This is done with the USB Autoscope III in single-channel analog mode;
- In the adjustment panel, select analog input number 1;
- Connect the input lead for analog input number 1 and an exact digital multimeter (DMM) to an automobile battery;
- Choose "Control" in item "Adjust channels" then select analog input number 1;
- In the item named "Voltage (mkV/ADC step)", type in a value that will cause the USB Autoscope III value and the value from the DMM to be equal;
- Repeat items 2-5 for the remaining analog inputs 2-5;
- Input 5 has a 1:10 attenuator built-in. It is therefore necessary to choose "Control => Adjust channels => Analog input 5" and in line "Input divider:" select 1:1. After this is done, the steps 3-5 can be done.
Zero calibration of the analog inputs 7-8.
- Connect the Ignition Adapter to the USB Autoscope III and the adapter to a 12V power source;
- Put the USB Autoscope III in single-channel analog mode;
- In the adjustment panel of channel 1 select analog input 7;
- Choose "Control" in item "Adjust channels" then select analog input number 7;
- In the item "Offset [ADC steps]" enter a value that causes the multimeter of this channel to show 0mV (+/-8mV);
- Next, in the adjustment panel of channel 1 select analog input 8;
- In channel control panel 1 select "1:10000";
- In "Control" in item "Adjust channels" choose the "Analog input 8" and in the line "Input divider" to specify "1:1";
- In "Control" in item "Adjust channels" select the "Analog input 8" and type in the line "Offset [ADC steps]" a value that will cause he multimeter of this channel to show 0mV (+/-80V).
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