Announcement
Collapse
No announcement yet.
Multimeter with inductance?
Collapse
X
-
The split receptacle contacts act as switches. Without them (or a separate switch) 4-wire operation via the blade contacts would not be possible.
-
Originally posted by Helmholtz View PostI looks as if the meter is laid out for 4-wire operation, i.e. separate current source and voltage measuring circuits. As it also allows 2-wire measurement, the banana receptacles need to provide a shorting function when inserting a normal banana plug to connect source and meter circuits.
In other words, the split contact banana receptacles are necessary to allow 4-wire measurement with no bananas inserted.
Once banana plugs are inserted into the +/- receptacles and the 2 halves are shorted, the 4-wire system is converted to a 2-wire configuration.
IET no longer sells the DE-5000 (or its successor DE-6000?), but here here is the IET manual (from 2011) on the DE-5000: https://www.ietlabs.com/pdf/Manuals/DE_5000_im.pdf
It appears (page 37 top) that the split-pin banana jacks are used only to compensate paths within the instrument, so no split-pin dual banana plugs are used or provided.
IET also provides a 78-page primer on LCR measurements: https://www.ietlabs.com/pdf/applicat...%20Edition.pdf
- Likes 1
Leave a comment:
-
I looks as if the meter is layed out for 4-wire operation, i.e. separate current source and voltage measuring circuits. As it also allows 2-wire measurement, the banana receptacles need to provide a shorting function when inserting a normal banana plug to connect source and meter circuits.
In other words, the split contact banana receptacles are necessary to allow 4-wire measurement with no bananas inserted.
Once banana plugs are inserted into the +/- receptacles and the 2 halves are shorted, the 4-wire system is converted to a 2-wire configuration.Last edited by Helmholtz; 12-29-2018, 04:37 PM.
Leave a comment:
-
Originally posted by nosaj View PostLooks like your stuck using the tl-21 adapter and modifying a set of kelvin cables.
Could not find what your asking for.
http://dexterslab2013.blogspot.com/2...onversion.html
nosaj
I have no idea how they came up with the receptacles (split single banana) on the meter itself and what plug is supposed to mate with it. And if there were such a plug, what would prevent it from rotating so it shorts the 2 sides together?
So, technically, this meter supports 4 wire measurement, but there are no commercially available accessories to do so unless you build your own.
Leave a comment:
-
Looks like your stuck using the tl-21 adapter and modifying a set of kelvin cables.
Could not find what your asking for.
http://dexterslab2013.blogspot.com/2...onversion.html
nosaj
Leave a comment:
-
So can anyone link a 4 wire probe set that will work with these split banana or the double sided blade terminals?
Leave a comment:
-
Originally posted by g1 View PostThanks nosaj.
Split banana's are definitely new to me. Still think it's very odd there is no mention of it or of an accessory available in the instruction manual.
Leave a comment:
-
Originally posted by g1 View PostIt does not seem to have kelvin 4 wire capability. It has 2 probe ports and 'shield'. Only 3 terminals of the meter are used at a time.
On the adapter, the 3 blade terminals are used, the other 3 are 'dummies' and only used for physical support.
[ATTACH=CONFIG]51686[/ATTACH]
Leave a comment:
-
Thanks nosaj.
Split banana's are definitely new to me. Still think it's very odd there is no mention of it or of an accessory available in the instruction manual.
Leave a comment:
-
Originally posted by Reader View PostI think the blades are one sided edge style connections made of PCBoard material. I could not find a photo showing the other side of those blades. That would clear up the situation.
What I don't understand is why there is no 4 probe accessory and no mention of 4 wire Kelvin type measurement in the operation section of the manual?
Unless those 3 slots are a standard type connector, there is no way to hook up 4 probes.
(edit: I do still need to watch that EEV video, hopefully it will clear everything up)
Leave a comment:
-
Originally posted by Reader View PostI think the blades are one sided edge style connections made of PCBoard material. I could not find a photo showing the other side of those blades. That would clear up the situation.
https://www.eevblog.com/forum/testge...-and-teardown/
nosaj
Leave a comment:
-
Originally posted by Helmholtz View PostThis would make sense. It means that the two contacts on the blades are separated by some insulating carrier. Not obvious to me from the pictures.
Leave a comment:
-
Originally posted by Reader View PostThe tear down article referenced in post #24 seems to indicate that there are 2 contacts on each of the + and the - blade contacts. Therefore, it's likely that the adapter box does provide true 4 wire connection. The dual contacts are visible in the photos in post #24. (Same photos as used in the tear down article)
Leave a comment:
-
The tear down article referenced in post #24 seems to indicate that there are 2 contacts on each of the + and the - blade contacts. Therefore, it's likely that the adapter box does provide true 4 wire connection. The dual contacts are visible in the photos in post #24. (Same photos as used in the tear down article)
Leave a comment:
Leave a comment: