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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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