Products > Test Equipment
New MicSig/EEVblog DP10007 HV Differential Probe
ExaLab:
The CMRR is the heart of a differential probe.
It is much more important than bandwidth and this heavy limitation (CMRR close to -20dB @ 10MHz) of the probe is absolutely not negligible!
I think (but I'm not sure) that I have identified the cause of this problem. I will try to fix it soon.
I hope micsig is kind enough to let me have a new front label to replace the one I had to remove
hatte:
--- Quote from: EEVblog on August 04, 2021, 02:42:18 am ---I've been informed by Micsig that a new version of the DP10007 is coming shortly, presumably to fix the CMRR issue I raised.
--- End quote ---
Any information available on this "new and improved" version of the DP10007 probe?
E.g. is the updated version currently being shipped Micsig?
Any information of serial number cut-over, or other way to identify new variant?
PartialDischarge:
The CMRR at HF of a differential probes is going to be bad no matter what you do, it may be a bit better than bad, but still bad. For line frequency work they are fine but for measuring low voltage floating signals in power electronics only fiber isolated probes make sense.
BH3XON:
I bought a differential probe, $1150,but I haven't received it yet.
The manufacturer describes it to use “RF isolation”,so it has a good HF CMRR。
But the differential input voltage is low, I used to test the LLC Half-bridge GaN drive signal should be ok.
Regarding "RF isolation", I guess it may be magnetic coupling isolation。
Bandwidth:50 MHz
Attenuation:2x, 20x
Total range (DC+ACpp):3 V (2X),30 V (20X)
Max input voltage (compared to ground):±1500 V
Noise:5mV(2X),50mV(20X)
CMRR(2X):
-140 dB (100 Hz)
-120 dB (1 MHz)
-85 dB (10 MHz)
-60 dB (50 MHz)
BH3XON:
I received the differential probe mentioned above.
The following figure shows the key waveforms used to test the LLC resonant half-bridge,
CH1: Half-bridge voltage, CH2: LS_GATE, CH3: HS_GATE, CH4: resonant current
HF CMMR is not bad,But the differential input voltage is only ±30V ! I am worried that it will be damaged! :palm:
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