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| Digital Oscilloscope Maximum Input Voltage |
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| David Hess:
--- Quote from: tautech on January 21, 2018, 07:49:08 pm --- --- Quote from: mike_mike on January 21, 2018, 07:40:11 pm ---The maximum input voltage is 300V peak as it is mentioned in the manual ? --- End quote --- Yes, it applies to a 1:1 probe or direct cable connection. --- End quote --- It also applies to 10x probes that do not include an internal shunt which is practically all of them. If you use a 10x probe and set the input coupling to AC, then the coupling capacitor will charge to the *unattenuated* DC voltage at the probe tip so 300 volts peak is still the maximum input voltage. This same restriction applies to high voltage 100x probes that do not include an internal shunt which again is practically all of them. 1000x probes include an internal shunt. |
| mike_mike:
Thanks for the reply. The x1 and x10 probes are the same with 1x and 10x probes ? Is the same thing if I say x1 and x10 or 1x and 10x ? |
| David Hess:
--- Quote from: mike_mike on January 27, 2018, 11:51:16 am ---The x1 and x10 probes are the same with 1x and 10x probes ? Is the same thing if I say x1 and x10 or 1x and 10x ? --- End quote --- Yes, they are the same thing. Some manufacturers write it one way and some write it the other way. I prefer writing 1x and 10x to avoid capitalization of the "x" at the beginning of a sentence. |
| mike_mike:
While de coupling is set to DC, if I put the probe to the ground clip, it is normal to appear noise on the screen ? For example if I set the scope and the probe to 1x, the peak to peak voltage of the noise is about 800uVpp and while the scope and the probe are set to 10x the noise is about 8mVpp. Is that normal ? |
| David Hess:
--- Quote from: mike_mike on January 27, 2018, 05:33:12 pm ---While de coupling is set to DC, if I put the probe to the ground clip, it is normal to appear noise on the screen ? For example if I set the scope and the probe to 1x, the peak to peak voltage of the noise is about 800uVpp and while the scope and the probe are set to 10x the noise is about 8mVpp. Is that normal ? --- End quote --- DC or AC coupling should not matter and that noise is normal. The bandwidth at the probe tip is high enough to pick up interference through the loop area of the ground lead. If you short the probe tip to the collar to reduce the loop area, then the interference should be reduced practically to zero and coaxial connections to the probe tip without the ground lead are often used for only this reason. A 10x probe will pick up more interference than a 1x probe because of its lower input capacitance and higher bandwidth. |
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