Attenuator 10:1 with High Bandwidth
With high bandwidth and fault-protection, the 10:1 attenuator has been designed to allow fuel injector and primary ignition waveforms to be measured using PicoScope oscilloscopes.
The TA197 is a passive 10:1 attenuator. This means e.g. that a 10V signal at its input will appear as a 1V signal on the output.
The TA197 allows voltages of up to 400V to be measured. It is designed for ground-referenced signals only, as it attenuates the signal path but not the ground path
The TA197 attenuator also increases the input impedance of the oscilloscope from 1 MOhm to 8 MOhm and can also be used when measuring the output of high-impedance sensors such as piezo knock sensors where directly connecting an automotive scope can attenuate the signal or induce a fault code.
Please note: When using a PicoScope 4225, 4425, 4225A or 4425A oscilloscope, the attenuator is not normally needed for measuring injectors as the voltage spike is usually under 200V. It will be required however when using older generations of PicoScopes which only measure to 50V or 100V.
The 10:1 attenuator is an improved version of the 20:1 attenuator previously available from Pico.
Fuel injector and primary ignition signals contain short-duration high-voltage spikes: “inductive kicks”. We therefore recommend the use of two ground connections between the oscilloscope and the vehicle under test. Make one ground connection using the measurement test lead. Connect a second ground lead between one of the BNC connectors on the oscilloscope and a secure ground point on the vehicle such as the negative terminal of the battery. Misconfiguration and/or failure to follow these warnings may cause damage to the product and/or computer and could cause injury to yourself or others.
Technical data:
Attenuation. 10:1
Input impedance: 8MOhm
Input capacitance: 27pF
Bandwidth: 20MHz (-3dB)
Max. input voltage: 400V
