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Siglent ISFE, scope front end isolator, any opinions?

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tautech:
With the release of the Siglent SDS1000X series DSO's and R2 FW for the SDS2000 series Siglent now has the 200:1 matching attenuation settings for their ISFE.
As a result OSD vertical measurements are now reasonably accurate.

Although the ISFE provides only a 1 MHz BW it does provide a safe method of isolation for scopes and users.

Max input voltages:
Per channel +/- 600V pk

Max floating voltages:
Channel reference (Gnd) to Earth ground 1000V rms
Between isolated channels 2000V rms


As connected with SDS1202X DSO measuring probe Cal waveforms (3V 1 KHz)
Waveform position and settings adjusted for best viewing. Full BW. No Filters.

Ch 1: Siglent scope probe  1:1
Ch 2: ISFE supplied alligator lead 1:1


USB lead from another device powers ISFE as USB port needed for screen captures


ISFE supplied lead shows least over/undershoot (Ch 2)




Eres mode

nctnico:
Did you adjust the probe? That could be the source of the overshoot. Overshoot indicates the frequency response will be off (or wrong).

tautech:

--- Quote from: nctnico on September 24, 2015, 10:03:14 am ---Did you adjust the probe? That could be the source of the overshoot. Overshoot indicates the frequency response will be off (or wrong).

--- End quote ---
AS the ISFE is optimised for the supplied Alligator leads, AND 1:1 input I suspect scope probes that are for 1M Ohm inputs may not work correctly.  :-\

How would you suggest I check the ISFE front end impedence over a representitive portion of its 1 MHz BW?

rf-loop:

--- Quote from: tautech on September 25, 2015, 01:32:59 am ---
--- Quote from: nctnico on September 24, 2015, 10:03:14 am ---Did you adjust the probe? That could be the source of the overshoot. Overshoot indicates the frequency response will be off (or wrong).

--- End quote ---
AS the ISFE is optimised for the supplied Alligator leads, AND 1:1 input I suspect scope probes that are for 1M Ohm inputs may not work correctly.  :-\

How would you suggest I check the ISFE front end impedence over a representitive portion of its 1 MHz BW?

--- End quote ---

Input Impedance: 10M  ohm (this is enough  for think normal 1Mohm probe comp adjust do not perhaps work)
For input C  can not find specs.

tautech:

--- Quote from: rf-loop on September 25, 2015, 02:25:02 am ---
--- Quote from: tautech on September 25, 2015, 01:32:59 am ---
--- Quote from: nctnico on September 24, 2015, 10:03:14 am ---Did you adjust the probe? That could be the source of the overshoot. Overshoot indicates the frequency response will be off (or wrong).

--- End quote ---
AS the ISFE is optimised for the supplied Alligator leads, AND 1:1 input I suspect scope probes that are for 1M Ohm inputs may not work correctly.  :-\

How would you suggest I check the ISFE front end impedence over a representitive portion of its 1 MHz BW?

--- End quote ---

Input Impedance: 10M  ohm (this is enough  for think normal 1Mohm probe comp adjust do not perhaps work)
For input C  can not find specs.

--- End quote ---
Exactly.
Thank you.

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