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Pico tektronix secondary ignition oscilloscope probes
Pico tektronix secondary ignition oscilloscope probes
AUTOMOTIVE SECONDARY IGNITION PICKUP
PP178 — High Voltage Spark Ignition Pickup
Due to the high voltages involved in secondary ignition systems, it is not possible to make measurements by direct connection; attempting to make a direct connection will almost certainly damage the measuring instrument.
The PP178 is a capacitive pickup that simply connects around the insulation of an ignition circuit component such as a plug wire — this avoids the need for direct connection. The probe attenuates by a factor of 10,000 so ignition high voltage can be read directly from the oscilloscope graticule.
The PP178 comes with a shielded 2.5m (100 inch) lead. It is suitable for use with conventional ignition systems and most HEI and DIS systems.
How to use the PP178 Secondary Ignition Pickup
Safety precautions before use:
* Keep the lead away from pulleys and other moving parts
* Keep the lead away from heat
* Never let the pickup come in direct connection with primary or secondary voltage (otherwise the oscillocope may be damaged)
* Always use the ground clip
* Do not let the metal portion of the pickup contact a ground
* Connect the PP178 to the automotive oscilloscope before connecting to the vehicle
* Connect the ground clip to a good ground on the vehicle
* Standard Ignition: clip the pickup around the coil wire (or one plug wire at a time)
* Intergrated coil: clip the pickup around the central location on the distributor cap
* DIS: clip the pickup around one plug wire at a time
IGNITION PICKUP ON HARLEY-DAVIDSON IRON-HEAD SPORTSTER NO. 2 CYLINDER PLUG WIRE
SPARK PLUG VOLTAGE WAVEFORM FROM SPORTSTER CYLINDER NO. 2
Sample automotive waveforms can be downloaded free from here: http:// /auto/waveforms.html.
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