Products > Test Equipment
Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found
giacomo:
--- Quote from: lor3n7o on March 14, 2021, 12:28:10 am ---hello I have read this post and I must say that it is very interesting.
i wanted to make a request if someone can help me. i have a ths710a. i wanted to buy a P5102 HV probe but looking for it i saw that they have very high prices even if used. since it is passive I thought I would try to do it at home. does anyone of you know how the resistances of the divider 1/10 inside are configured?
from the datasheet it is understood that the total resistance is 5Mohm but it is not clear if there is a resistive part on the ground terminal.
thank you very much to those who can help me.
Greetings
--- End quote ---
I think you are watching page 6 of the P5102 manual.
That page do not show you the internal costruction of the probe, but it shows how your instrument (scope + probe) is loading your circuit, so 5M is the total resistance seen from the load.
Try to look around, i think there must be a topic about the diy costruction of high voltage probes, maybe there are cheaper alternatives depending what is your need
harrimansat:
what frequency/voltage do you need to measure? You can buy a cheap 1:100 probe, for example:
https://www.ebay.com/itm/P4100-High-Voltage-Oscilloscope-Probe-Kit-100MHz-2KV-100-1-for-HP-Tektronix/133525219111?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D231489%26meid%3D683b171408414fa284fbea78ea267d59%26pid%3D101195%26rk%3D2%26rkt%3D12%26mehot%3Dpf%26sd%3D323280509270%26itm%3D133525219111%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv9PairwiseUnbiasedWeb&_trksid=p2047675.c101195.m1851
lor3n7o:
thank you very much for your reply.
very interesting this probe.
I suspect that the tektronix P5102 probe has a particular connection on the reference signal (that of the crocodile and the outside of the bnc connector) which allows to increase the level of the floating measurement.
look at the photo I am attaching.
lor3n7o:
This P5102 probe is declared as passive.
I suspect that on the ground terminal of the probe there is a resistance that guarantees greater isolation and thus the floating voltage that this ths700 oscilloscope can support increases from 30 to 600V.
It's possible?
Greetings
giacomo:
Let's say there is a resistor on the ground terminal of the probe and i want to use the P5102 on a grounded bench oscilloscope. Because.. Why not ?
If i want to measure something that is ground reference that resistor would be shorted.
With the same probe on my insulated oscilloscope it will not be and it should be part of the divider.
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