Products > Test Equipment
New low-cost ($170) 100MHz Differential scope probe from Micsig
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nidlaX:

--- Quote from: Hydron on July 13, 2017, 02:25:16 pm ---Input referred noise spec:
?40mVrms (50X)
?230 mVrms (500X)

An example of pk-pk noise (measured by Micsig, compared with Tek P5200A) can be seen on the aliexpress listing linked in the OP.

If the noise spec (and other specifications) are true, these could be a really good deal if the somewhat low sensitivity (50x) is OK for the intended application.

edit: see http://www.micsig.com/UploadFiles/file/High%20Voltage%20differential%20probe.pdf
I note the oddity of 75R output impedance though - not an issue if it's driving 1Mohm input, but unusual and annoying if you want to drive 50R! Is this really the impedance, or is it a typo?

--- End quote ---
It is actually 75 Ohms according to their engineering department. I told them it's a strange choice, not sure why they made this decision. Keep this in mind if you decide to use a BNC cable extension.

By the way, if anyone finds any typos in or needs clarifications regarding anything in the user manual, let me know.
DK-1:
I bought 2 just now!
For this price i was too much curious to try it, when arrived i will tell something
nctnico:
Is there any CAT rating on this differential probe? Without it I wouldn't want to use it on anything mains powered.
alm:
It does not appear to be silkscreened on the case or printed in the datasheet, so I would assume not. Probably no independent testing either. So safety for mains voltages is suspect.
Mechatrommer:

--- Quote from: nidlaX on July 13, 2017, 02:49:25 pm ---
--- Quote from: Hydron on July 13, 2017, 02:25:16 pm ---Input referred noise spec:
?40mVrms (50X)
?230 mVrms (500X)

An example of pk-pk noise (measured by Micsig, compared with Tek P5200A) can be seen on the aliexpress listing linked in the OP.

If the noise spec (and other specifications) are true, these could be a really good deal if the somewhat low sensitivity (50x) is OK for the intended application.

edit: see http://www.micsig.com/UploadFiles/file/High%20Voltage%20differential%20probe.pdf
I note the oddity of 75R output impedance though - not an issue if it's driving 1Mohm input, but unusual and annoying if you want to drive 50R! Is this really the impedance, or is it a typo?

--- End quote ---
It is actually 75 Ohms according to their engineering department. I told them it's a strange choice, not sure why they made this decision. Keep this in mind if you decide to use a BNC cable extension.

By the way, if anyone finds any typos in or needs clarifications regarding anything in the user manual, let me know.

--- End quote ---
the output coax cable probably 75ohm.just add 75ohm terminator at scope end to get nonoddities 100/1000x figure.
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