PicoBNC+™ PICO-TA397 Secondary 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 TA397 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 TA397 comes with a shielded 1.8 m (6 foot) lead. It is suitable for use with conventional ignition systems and most HEI and DIS systems. Our library of Automotive Waveforms contains example waveforms captured using a PicoScope automotive oscilloscope and the TA398 or the MI074 BNC version.
This lead is fitted with a PicoBNC+ interface, allowing it to be recognised by the software for auto-configuration. The lead requires a PicoScope featuring the PicoBNC+ such as the 4225A or 4425A.
This is the direct equivalent of the PICO-MI074 Secondary Ignition Pickup Lead. The new version is automatically recognised by PicoScope software when it is connected to the scope.
The PICO-MI074 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 PICO-MI074 comes with a shielded 1.8 m (6 foot) lead. It is suitable for use with conventional ignition systems and most HEI and DIS systems. Our library of Automotive Waveforms contains example waveforms captured using a PicoScope automotive oscilloscope and the PICO-MI074.
Safety precautions before use:
Connecting the PICO-MI074:
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While HT leads would appear to be components from the past, the secondary ignition pickup lead is far from redundant. We have relied on these devices to obtain critical secondary ignition information for years, assisting with diagnosis of misfires and emission failures.
On older vehicles, you can use a PICO-MI074 to monitor the ignition coil output before the distributor which yields a sequential, comparitive view of all cylinders in firing order. Identify cylinders by connecting another scope channel to a cylinder-specific signal to (e.g. an injector or to the CAM sensor) or use another PICO-MI074 on a plug wire. Trigger using that secondary channel.
COP coils are being introduced in many new vehicles. If you wish to conduct hands-free testing of secondary ignition, an inductive COP proble is difficult to use. We suggest using the PICO-MI074 with our PICO-TA037 for hands-free intermittent misfire detection under road-test conditions. These leads allow you to monitor secondary ignition events, so revealing the activity in each cylinder under true operating conditions.
Typical examples of use: