Brymen BM867 & BM869 - Page 1
Forum section: electronics / testgear

author: onemilimeter
author_rank: Frequent Contributor
timestamp: February 19, 2017, 02:39:40 am
content: Hi... Wish to purchase one of these meters. Before purchasing, wish to confirm whether these meters can do "LoZ" measurement? Kindly advise. Thanks.

author: rstofer
author_rank: Super Contributor
timestamp: February 19, 2017, 03:24:20 am
content: According to the spreadsheet in the stickies for this forum - no...

author: mtdoc
author_rank: Super Contributor
timestamp: February 19, 2017, 04:03:37 am
content: Yeah, I have a Brymen 257 and it has it but I don't think the 860 series meters do.You can have a look at all the meter datasheets onthe Brymen website

author: onemilimeter
author_rank: Frequent Contributor
timestamp: February 19, 2017, 04:16:49 am
content: For a meter that does not provide LoZ measurement, can we build an adapter to be used with the meter for LoZ measurement? It's like the uCurrent concept which Dave invented before... Thanks.

author: Wytnucls
author_rank: Super Contributor
timestamp: February 19, 2017, 04:30:45 am
content: https://www.amazon.com/Fluke-SV225-Voltage-Eliminator-Adapter/dp/B005H0NKDChttp://en-us.fluke.com/products/all-accessories/fluke-sv225.html#overview

author: DaJMasta
author_rank: Super Contributor
timestamp: February 19, 2017, 06:10:07 am
content: My BM867s does not have a LoZ function.This hasn't been a problem for me, though when I eventually get a second handheld, I will be looking for one. It really only comes up if you want to discharge a cap that stores its charge for a long time, and most of the large caps I've worked with either have a bleeder or are directly powering circuitry that uses up the charge on them quickly after being powered down. There's also other methods for discharging such a cap, though it is nice to do it through something with a decent CAT rating.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: February 19, 2017, 11:10:42 am
content: Quote from: Wytnucls on February 19, 2017, 04:30:45 amI wander what is inside that little box (SV225), a shunt resistor?

author: SeanB
author_rank: Super Contributor
timestamp: February 19, 2017, 02:35:19 pm
content: Quote from: onemilimeter on February 19, 2017, 11:10:42 amProbably 2 series connected PTC thermistors and a series resistor, to limit the current to a semi constant value as the capacitor discharges.

author: Unknown
author_rank: Unknown
timestamp: February 19, 2017, 06:43:19 pm
content: I have one and took it apart some time ago. I'll try to get a photo uploaded. From memory, it had a 1K resistor and a ptc/ntc?

author: onemilimeter
author_rank: Frequent Contributor
timestamp: February 20, 2017, 08:13:43 am
content: Quote from: steverino on February 19, 2017, 06:43:19 pmGreat !! Hope that you will share the photo soon... Thanks in advance...

author: Unknown
author_rank: Unknown
timestamp: February 21, 2017, 07:49:17 am
content: Quote from: onemilimeter on February 20, 2017, 08:13:43 amI've attached the circuit diagram. It's just paralleled with the input jacks of the meter.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: February 22, 2017, 07:06:44 am
content: Quote from: steverino on February 21, 2017, 07:49:17 amMany thanks... Fluke distributor just quoted the Fluke SV225 for USD116...