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Scope probe performance
While I had the sweep generator available, I decided to check out some scope
probes. Lately, one can find replacement scope probes on eBay for cheap. Probes rated as 100 MHz probes can be had for around $10 each. I tested several probes, connecting them to an Agilent 300 MHz scope and capturing the frequency response, The responses shown are, or course, the composite response of the probe itself and of the Agilent DSO5034. The Agilent response is quite flat up to 300 MHz, so the response shown is essentially the response of the probe, up to 300 MHz. The probe tip and ground sheath was connected directly to the generator output without the spring hook style tip or usual ground lead (except for one example with ground lead). The first is a 100 MHz rated probe purchased from smtzone in New Jersey. This was the best of the low cost probes tested. The second is a similar looking, Chinese-made probe from another supplier. The third is the probe that came with the Rigol DS1204B oscilloscope tested in an earlier post. The fourth is the probe that came with a Tek TPS2024 oscilloscope. The fifth is an Agilent 10073C 500 MHz rated probe. The sixth is the smtzone probe (probe1), used with a spring hook tip and ground lead. The smtzone probe has much better frequency response than its 100 MHz rating would suggest. It also has a measured rise time of just a little over 1 nS. For $10 it is an incredible bargain. |
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Scope probe performance
On 30 Jan 2010 14:39:02 -0600, The Phantom wrote:
While I had the sweep generator available, I decided to check out some scope probes. Lately, one can find replacement scope probes on eBay for cheap. Probes rated as 100 MHz probes can be had for around $10 each. I tested several probes, connecting them to an Agilent 300 MHz scope and capturing the frequency response, The responses shown are, or course, the composite response of the probe itself and of the Agilent DSO5034. The Agilent response is quite flat up to 300 MHz, so the response shown is essentially the response of the probe, up to 300 MHz. The probe tip and ground sheath was connected directly to the generator output without the spring hook style tip or usual ground lead (except for one example with ground lead). The first is a 100 MHz rated probe purchased from smtzone in New Jersey. This was the best of the low cost probes tested. The second is a similar looking, Chinese-made probe from another supplier. The third is the probe that came with the Rigol DS1204B oscilloscope tested in an earlier post. The fourth is the probe that came with a Tek TPS2024 oscilloscope. The fifth is an Agilent 10073C 500 MHz rated probe. The sixth is the smtzone probe (probe1), used with a spring hook tip and ground lead. The smtzone probe has much better frequency response than its 100 MHz rating would suggest. It also has a measured rise time of just a little over 1 nS. For $10 it is an incredible bargain. Interesting, it seems like local ground leads are not always advantageous. |
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