cheap currents probes for 20pA to 100 uA

[billuanand]

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

[HighVoltage]

The Keysight N2820A comes to mind but it only goes down to 50uA and is NOT cheap

[LA7SJA]

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

[billuanand]

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.

[BravoV]

What is your budget limit ?

[billuanand]

suitable product as low as possible.

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

 

[BravoV]

suitable product as low as possible.

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

[billuanand]

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.

[Mechatrommer]

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?

[billuanand]

yes, i want measure current at gate and drain of FET for current gain measurement. typically gate current is very low.
 

[singapol]

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

[Marco]

FETs with current gain, huh?

[Mechatrommer]

he is in "specialized area" allright? he want to measure parasitics, for what is beyond me..

[Zero999]

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