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New MicSig/EEVblog DP10007 HV Differential Probe

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ExaLab:
Yesterday i got my new probe (DP10007).

Input referred noise compliant with the manufacturer specifications (and with data measured by mrprecision):

13.7mV rms (x10) and 29.1mV rms (x100)

The "anomaly" a with frequency of about 90 khz observed by some people is not present...
Next steps, evaluation of accuracy, bandwidth and CMRR.
The BNC connector of the probe appears quite hard to fit into the scope socket. May be it is a bit out of specification. Probably I'll replace it to avoid unnecessary stress to the oscilloscope connectors.



To the guy who asked for the manufacturing date (and now he seems to have removed the related post):
my probe is dated 16-03-2021. The rms noise you measured in your probe seems a bit out of specification. To avoid the effects of any dc component I suggest to redo the acquisitions using the "Stdev" instead of the "rms". If still out of specification, measure the noise of your oscilloscope and try to subtract it from the acquisition made   ("probe noise"^2 = "measured noise"^2  - "oscilloscope noise"^2)

ExaLab:
Some further measurements I've done on my probe


Static gain accuracy:

x10       -0.53%   (spec. +/- 2%)
x100     -1.12%   (spec. +/- 2%)


Input referred offset:

x10     + 9.8mV
x100   + 47.2mV


CMRR:

Freq.                 x10    x100    Micsig Spec.

DC (50Hz)         -89     -79      -80
20KHz               -75     -74      -60
100KHz             -72      -63      n.a.
1MHz                -57      -42     -50
10MHz              -39      -22     -40




Rise Time (Step response):

                 Rise Time   Fall Time     Bandwidth Estimation (from step response) (*)

x10            3.71 ns      3.71 ns      94 MHz
x100          3.37 ns      3.60 ns      100 MHz

(*) Single pole low pass filter model


Measured Bandwidth (-3dB):

x10     128 MHz
x100   118 Mhz


Bandwidth Flatness:

              +/- 1dB          +/- 3dB

x10        DC - 33MHz      33MHz - 100MHz
x100      DC - 33MHz      33MHz - 88MHz





Concluding:

Pros:

- good overall performances considering the price
- very nice and compact package design

Cons:

- CMRR below specification
- too long (and oversized) input cables can cause high frequency artifacts. I would have preferred them shorter (20-25cm) with a possible extension supplied (e.g. Tektronix approach...)
- BNC connector out of specification (it hardly enters the oscilloscope connectors, risking damaging them)

EEVblog:
I've been informed by Micsig that a new version of the DP10007 is coming shortly, presumably to fix the CMRR issue I raised.

voltsandjolts:
Thanks for the heads-up on that Dave.
Unfortunately I need to push-the-button on a DP10007 soon-ish, so I will probably get old stock.

Here's hoping the improvement will be retrofittable to older units  :popcorn:

EEVblog:

--- Quote from: voltsandjolts on August 04, 2021, 07:22:12 pm ---Thanks for the heads-up on that Dave.
Unfortunately I need to push-the-button on a DP10007 soon-ish, so I will probably get old stock.
Here's hoping the improvement will be retrofittable to older units  :popcorn:

--- End quote ---

Yeah, it's not a big deal. It's just that they matched the specs of the Sapphire HVP70 because that's what I asked them to try and do and they said they were able to do that, but turns out it fell short on CMRR.

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