Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Specmaster:
I was measuring the output from a cheap basic bench power supply which I thought would be pretty much what an average hobbyist would be likely to use. I agree if I was using something a little more sophisticated from say HP or TTi etc then the last digit would be more stable. That can be demonstrated if I connect my AD584-M instead of the power supply, set it on 10v it does improve dramatically so the 8840A reads 10.0076 and the 3478A reads 10.0075/4 and the discrepancy there is probably down to the 8840A having massive input impedance advantage (10,000M) over the 3478A's 10M.
djos:
--- Quote from: Specmaster on June 26, 2018, 12:45:36 pm ---Nice unit, why not add a splash of colour to the lab? :-+
--- End quote ---
Cheers, It should meet my amateur needs quite nicely think .... at least till upgraditis kicks in! :-DD
med6753:
--- Quote from: Specmaster on June 26, 2018, 09:39:05 am ---There was a time when everyone knew what the voltage, current or resistance was and there was never any question about it,
--- End quote ---
Snipped....
Source: AD584-M - 9.99691V
Results after half hour warm-up. Hardly worth fussing over.
It's the variability of the source that drives you nuts.
Specmaster:
--- Quote from: med6753 on June 26, 2018, 10:23:55 pm ---
It's the variability of the source that drives you nuts.
--- End quote ---
You are spot on, if the source is varying, even slightly, with the higher resolution meter, the more the least significant digits are going to keep altering in an effort to reflect the changing input. Whereas with fewer digits, that change has got to be much bigger in order to alter the least significant digit. 3.5 meter, no change in display, 4.5 meter sometimes the last digit will go up or down by 1, 5.5 meter, last 2 digits were changing all the time on the power supply. Its like a proverb, man with 3.5 and 4.5 digits, knows the voltage, man with 5.5 or more digits is unsure of the voltage due to last digits changing. :-DD
Specmaster:
--- Quote from: med6753 on June 22, 2018, 10:28:28 pm ---
--- Quote from: Specmaster on June 22, 2018, 10:24:39 pm ---I'm in the garage tomorrow looking some angle brackets so I can fix my function generator and LCR meter to underside of my shelf. I'd like to mount the TF930 up there too but I'm worried about spoiling the resale value of it later if I upgrade it.
--- End quote ---
Looks like I've started a trend. You must post pix :-+
--- End quote ---
As promised here is my revised (for now) bench, what you can't see is dotted around the room in any suitable space I can are 4 CRO's, signal generator, numerous, microscopes, handheld DMM's, analogue meters, portable LCR devices, soldering kit, jigs, isolating transformer, variac, power meter, parts racks, calibrators and tools etc. I'd love to have a room big enough to take a proper 2 or 3m bench and shelves then I could have all the kit out and ready to be used, maybe this week its my turn to win the lottery.... :-+
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version