Author Topic: cheap currents probes for 20pA to 100 uA  (Read 4949 times)

0 Members and 1 Guest are viewing this topic.

Offline billuanand

  • Contributor
  • Posts: 7
  • Country: in
cheap currents probes for 20pA to 100 uA
« on: October 19, 2015, 12:04:18 pm »
hi,

is there any current probes in 20pA to 100 uA current range with 50MHz bandwidth.

please advice me low cost current probe

and what is the Sensitivity mv/A in current probes, how it relate practically

thank you
sorry for my English
 

Offline HighVoltage

  • Super Contributor
  • ***
  • Posts: 5007
  • Country: de
Re: cheap currents probes for 20pA to 100 uA
« Reply #1 on: October 19, 2015, 12:28:27 pm »
The Keysight N2820A comes to mind but it only goes down to 50uA and is NOT cheap
There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline LA7SJA

  • Regular Contributor
  • *
  • Posts: 233
  • Country: no
  • Acting user manual reader & forum search engine
Re: cheap currents probes for 20pA to 100 uA
« Reply #2 on: October 19, 2015, 02:53:51 pm »
So you want to messure the current from a 3.00 Volt 50 MHz source in a 150 TOhm load? Why? And even  more importantly 20pA to 100uA is a 67dB range, linear from DC to 50MHz and of course cheap!  :-//

The Keysight N2820A has a 3MHz bandwith and it only costs $4,088 the N2821A has a $3,066 price.
If you could only tell us what you are trying to messure, it would be more easy to try and help you.

Johan-Fredrik
« Last Edit: October 19, 2015, 02:58:00 pm by LA7SJA »
"If at first you don't succeed, skydiving is probably not for you"
 

Offline billuanand

  • Contributor
  • Posts: 7
  • Country: in
Re: cheap currents probes for 20pA to 100 uA
« Reply #3 on: October 20, 2015, 04:05:26 am »
i want measure current at gate and drain of FET for current gain measurement. typically current ratings are 20pA to 100uA i want sense this current.
sorry for my English
 

Offline BravoV

  • Super Contributor
  • ***
  • Posts: 7372
  • Country: 00
  • +++ ATH1
Re: cheap currents probes for 20pA to 100 uA
« Reply #4 on: October 20, 2015, 04:06:14 am »
What is your budget limit ?

Offline billuanand

  • Contributor
  • Posts: 7
  • Country: in
Re: cheap currents probes for 20pA to 100 uA
« Reply #5 on: October 20, 2015, 04:18:48 am »
suitable product as low as possible.

and their is any alternative to measure current using DSO, VNA etc. for this measurement

 
sorry for my English
 

Offline BravoV

  • Super Contributor
  • ***
  • Posts: 7372
  • Country: 00
  • +++ ATH1
Re: cheap currents probes for 20pA to 100 uA
« Reply #6 on: October 20, 2015, 04:26:19 am »
suitable product as low as possible.

1 ? 10 ? 100 ? 1000 ? .. rupee ?

Offline billuanand

  • Contributor
  • Posts: 7
  • Country: in
Re: cheap currents probes for 20pA to 100 uA
« Reply #7 on: October 20, 2015, 05:11:28 am »
i dnt know about current probes cost, first i want to know is it possible with any product or not.

please advice me, i searched lot for current probes but unable to find in this current range.

thank you.
« Last Edit: October 20, 2015, 05:14:10 am by billuanand »
sorry for my English
 

Offline Mechatrommer

  • Super Contributor
  • ***
  • Posts: 10517
  • Country: my
  • reassessing directives...
Re: cheap currents probes for 20pA to 100 uA
« Reply #8 on: October 20, 2015, 05:21:53 am »
i searched lot for current probes but unable to find in this current range.
because pA is very rare and highly specialized area... are you in specialized area?
Nature: Evolution and the Illusion of Randomness (Stephen L. Talbott): Its now indisputable that... organisms “expertise” contextualizes its genome, and its nonsense to say that these powers are under the control of the genome being contextualized - Barbara McClintock
 

Offline billuanand

  • Contributor
  • Posts: 7
  • Country: in
Re: cheap currents probes for 20pA to 100 uA
« Reply #9 on: October 20, 2015, 06:21:58 am »
yes, i want measure current at gate and drain of FET for current gain measurement. typically gate current is very low.
 
sorry for my English
 

Offline singapol

  • Frequent Contributor
  • **
  • Posts: 420
  • Country: sg
Re: cheap currents probes for 20pA to 100 uA
« Reply #10 on: October 20, 2015, 08:02:57 am »
i dnt know about current probes cost, first i want to know is it possible with any product or not.

please advice me, i searched lot for current probes but unable to find in this current range.

thank you.

HP4140B Picoamp meter  and DC voltage source perhaps? Find a cheap working unit or repair it.
    There are modern version of 4140 but can you afford it?

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR0.TRC0.H0.Xhp4140b.TRS0&_nkw=hp4140b&_sacat=0
 

Offline Marco

  • Super Contributor
  • ***
  • Posts: 5720
  • Country: nl
Re: cheap currents probes for 20pA to 100 uA
« Reply #11 on: October 20, 2015, 09:55:08 am »
FETs with current gain, huh?
« Last Edit: October 20, 2015, 09:58:09 am by Marco »
 

Offline Mechatrommer

  • Super Contributor
  • ***
  • Posts: 10517
  • Country: my
  • reassessing directives...
Re: cheap currents probes for 20pA to 100 uA
« Reply #12 on: October 20, 2015, 11:15:58 am »
he is in "specialized area" allright? he want to measure parasitics, for what is beyond me..
Nature: Evolution and the Illusion of Randomness (Stephen L. Talbott): Its now indisputable that... organisms “expertise” contextualizes its genome, and its nonsense to say that these powers are under the control of the genome being contextualized - Barbara McClintock
 

Offline Zero999

  • Super Contributor
  • ***
  • Posts: 17044
  • Country: gb
  • 0999
Re: cheap currents probes for 20pA to 100 uA
« Reply #13 on: October 21, 2015, 10:10:23 pm »
hi,

is there any current probes in 20pA to 100 uA current range with 50MHz bandwidth.

The shot noise at 20pA over a 50MHz bandwidth is 17.9pA so it's not possible to do that with any degree of accuracy.
https://en.wikipedia.org/wiki/Shot_noise#Effects_of_interactions
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf