Products > Test Equipment
CP2100A current probe measuring frequency
chrisb741:
Can someone explain this too me.
See image, the orange trance is a rolling average from the CP2100A not B probe
It is measuring the gate current to a MOSFET.
If the probe is 800kHZ why am I seeing sub 1us current spikes
csuhi17:
--- Quote from: chrisb741 on January 23, 2024, 02:02:30 pm ---Can someone explain this too me.
See image, the orange trance is a rolling average from the CP2100A not B probe
It is measuring the gate current to a MOSFET.
If the probe is 800kHZ why am I seeing sub 1us current spikes
--- End quote ---
I don't see the image.
chrisb741:
Added
bdunham7:
The 800kHz BW specification just means that the response will not roll off by more than a certain amount at that point. I don't see a specific number in the MicSig specs, but -3dB is a typical threshold. The device still has a response above that point, it just may be less accurate and will typically eventually roll off but may also have peaks in the vicinity of the upper BW spec. So you'll see those <1µs spikes, but the amplitude could be signficantly off.
Martin72:
Hi,
--- Quote ---It is measuring the gate current to a MOSFET.
If the probe is 800kHZ why am I seeing sub 1us current spikes
--- End quote ---
What do you expect to see...
It's the current through the gate - In the first time the gate current is "high" because of the gate capacity.
These are the dips you see, after "charging" the gate capacity the current is very low - too low for the micsig probe.
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