Products > Test Equipment
Accurate Low Amp Current Probe Advice
KungFuJosh:
--- Quote from: Martin72 on November 02, 2024, 08:41:53 pm ---As I mentioned before, you set 10mV/div, 1:1 and 50Ohm on the scope itself and leave it as it is.
Everything else (bandwidth limitation, scaling, AC, DC) is set on the 503B.
--- Quote ---I set the SDG2122X output to 369mV at 1kHz, and that measured 5.00mA on my SDM3065X.
--- End quote ---
So you used a 73.8 ohm resistor as a load?
--- End quote ---
A piece of copper wire with some insulation on it.
Martin72:
I see, so you use the scope's internal 50 ohms as a load and connect the generator to the scope with this copper wire?
KungFuJosh:
--- Quote from: Martin72 on November 02, 2024, 09:04:37 pm ---I see, so you use the scope's internal 50 ohms as a load and connect the generator to the scope with this copper wire?
--- End quote ---
No, I connected the copper wire between the positive/negative grabbers on the cable from the AWG. Then ran that through the current clamp. I also tried the same way with a 100Ω resistor, but I guess I'm doing it wrong. 😉
Martin72:
--- Quote ---No, I connected the copper wire between the positive/negative grabbers on the cable from the AWG.
--- End quote ---
That would be a direct short circuit and you don't know how the SDG handles something like that (current limiting).
I would continue trying with the right resistors.
Or you have your ET load, use that first to see if the clamp is working properly.
Since the button was off the clamp:
Did you make sure that no “Probe open” indicator was lit on the AM503B?
KungFuJosh:
--- Quote from: Martin72 on November 02, 2024, 09:17:44 pm ---
--- Quote ---No, I connected the copper wire between the positive/negative grabbers on the cable from the AWG.
--- End quote ---
That would be a direct short circuit and you don't know how the SDG handles something like that (current limiting).
I would continue trying with the right resistors.
Or you have your ET load, use that first to see if the clamp is working properly.
Since the button was off the clamp:
Did you make sure that no “Probe open” indicator was lit on the AM503B?
--- End quote ---
I switched to DC with the ET load already, but I don't know what I should set things as. So how would you do it?
It's the AM503B, so I can set specific mA/DIV values (1,2,10,20,50,100 etc.)
I want to see what the low end is that this can measure, but I'm having trouble getting it to do anything in that range without lots of guessing.
How would you set this up? Tell me everything from the current amplifier to the scope and trigger settings. I know the scope settings are supposed to be 10mV/DIV, but why can't we change the display to A on the modern scope? There must be settings we can use related to the settings on the current amplifier?
Right now I have the PSU supplying 18V with no current limit. The ET load is set to draw 30mA. The current probe is on the negative lead with the arrow pointing towards the PSU negative, as the manual shows.
Thanks,
Josh
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version