Measuring 500V DC burst using CRO

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Discussion Overview

The discussion revolves around measuring a burst of 500V DC using a cathode ray oscilloscope (CRO). Participants explore the capabilities of the CRO and the appropriate probes for handling high voltage measurements, as well as alternative methods for voltage measurement.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant inquires about verifying if their CRO can handle a 500V burst and mentions the need for a high voltage (HV) probe.
  • Another participant suggests that if a probe does not resemble a specific type, it is not classified as high voltage.
  • A different participant recommends using a 100:1 scope probe for measuring 500V, referencing a tutorial for further information on purchasing such probes.
  • It is noted that while a 100:1 probe is generally sufficient for 500V, higher voltages (over 10kV) require more stringent probe specifications.
  • One participant proposes building a voltage divider as an alternative method for voltage measurement, suggesting it could achieve about 1% accuracy, particularly in power converters operating in this voltage range.

Areas of Agreement / Disagreement

Participants express varying opinions on the suitability of different probes for measuring 500V, with some suggesting that a 100:1 probe is adequate while others emphasize the need for specific probe characteristics. The discussion remains unresolved regarding the best approach to ensure accurate measurements.

Contextual Notes

Participants do not specify the exact characteristics required for high voltage probes, and there is ambiguity regarding the accuracy needed for the measurements. The discussion also does not clarify the limitations of using a voltage divider in this context.

Nikhil N
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I have to check whether my circuit producing a burst of 500V in CRO. How can I check whether CRO is capable of handling this high voltage? I have heard about HV probe, how to check the probe that I have is of HV type?
 
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If it doesn't look something like this it isn't High Voltage.
upload_2017-5-11_14-25-53.jpeg
 
Nikhil N said:
I have to check whether my circuit producing a burst of 500V in CRO. How can I check whether CRO is capable of handling this high voltage? I have heard about HV probe, how to check the probe that I have is of HV type?
You should be able to use a 100:1 'scope probe for that. Read through this tutorial and see what you can find online to buy:

http://www.radio-electronics.com/info/t_and_m/oscilloscope/oscilloscope-probes.php
Tom.G said:
If it doesn't look something like this it isn't High Voltage.
View attachment 203398
Depends on the voltage. Over 10kV or so, that's true. For 500V, the 100:1 probe can be enough. We use 100:1 probes to monitor our CE Mark test waveforms (Surge to 6kV, Burst to 4kV) routinely. :smile:
 
How accurate do you need this to be? You could build a voltage divider and probably get to about 1%. Due to cost - a simple voltage divider is used for voltage sensing in a lot of power converters in this V range,
 
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