Products > Test Equipment
TTI BS407 Precision Milli/Micro Ohmmeter-Just bought one used.
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djsb:
Just bought a used (without leads-shout out if you have a spare pair I can buy off you) TTI BS407 Precision Milli/Micro Ohmmeter for £455.00 (over £1K new).

https://resources.aimtti.com/datasheets/AIM-BS407_precision_micro-ohmeter_data_sheet-Iss1A.pdf

It has 1u Ohm resolution, so should be good enough for basic fault-finding on connectors etc. Does anyone else have one of these? I did have a quick look at a UNI-T UT620B, but it doesn't seem to have the same level of resolution. I wonder how much a set of new leads will cost me? Thanks.




P.S Can anyone recommend a basic precision resistance standard I can use to do a sanity/functionality test? Not too expensive, please. Thanks.
djsb:
Got a set of these 4 lead Kelvin probes as well from Warwick test supplies.

https://warwickts.com/8312/PJP-KITKELVIN-4934HA-Kelvin-Probe-Lead-Set-2m

Cost £130 including postage and VAT.

I hope they are OK.
The instrument is 7 years old and was calibrated about 5 years ago, and the internal batteries are OK according to the seller. Should be arriving this week, so I'll have everything by the end of the week. Might do a quick review on my YouTube channel at some stage.
Randy222:
How much current on DUT is needed by that meter to read u-ohm ?


There are so many.
Not sure which ones are good or not.

https://duckduckgo.com/?q=milliohm+meter&iar=images&iax=images&ia=images
djsb:
250mA according to the datasheet I provided a link to in my first post. The resolution is 1 micro Ohm on the 1999 micro Ohm range.
Randy222:

--- Quote from: djsb on January 08, 2024, 03:31:43 pm ---250mA according to the datasheet I provided a link to in my first post. The resolution is 1 micro Ohm on the 1999 micro Ohm range.

--- End quote ---
I asked because some of models, like the x-branded Lutron MO-2014 (aka MRC Lab MO-2014) spec sheet calls for 10A in the 0-60k u-ohm range. Where does a small handheld get accurate 10A from? It's internal fuse is a 10A fuse.
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