Using Blood Pressure Monitor with USB to DC Power Cable? - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: November 27, 2021, 10:08:33 am
content: Hello. I found USB Female to DC cable and it matched DC input on my blood pressure meter. However it requires 6V power while the most I can get is 5V. What would happen if I connected 5V DC cable to blood pressure meter?Nothing mentioned on blood pressure monitor about amperes too... I have 5V, 5.1V 1A and 2A power wall chargers. I don't know if there are USB wall chargers that supply 6V. Maybe it is safer to order 6V DC cable power supply for my blood pressure meter?

author: RoGeorge
author_rank: Super Contributor
timestamp: November 27, 2021, 10:26:49 am
content: In general, it's a very bad idea to power medical devices from mains using a random wall adapter.If anything goes wrong, it can electrocute the patient or the medical personnel handling the patient. Use a rechargeable battery pack instead of an outlet power adapter, and charge the batteries only after you disconnect them.Never connect to mains power outlet anything coming in direct contact with your body.Never put mains powered wires in bed with you. You can not know when something will fail.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 27, 2021, 01:11:26 pm
content: Blood pressure meters are isolated by pneumatic tubes so using a standard USB power supply is perfectly fine.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: November 27, 2021, 03:36:02 pm
content: Quote from: RoGeorge on November 27, 2021, 10:26:49 amInteresting because electric bed sheets are sold these days. Kinda makes me worry to get one...

author: Boris_yo
author_rank: Frequent Contributor
timestamp: November 27, 2021, 03:37:50 pm
content: I wonder which one is right for my blood pressure monitor. Without knowing its amperage I can't proceed.

author: wraper
author_rank: Unknown
timestamp: November 27, 2021, 03:42:18 pm
content: Quote from: Boris_yo on November 27, 2021, 03:37:50 pmNeither. I'm almost certain that you want to buy a complete trash from China. Either junk PSU with barely any insulation between mains and low voltage side, or has recycled PCB from e-waste inside.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: November 28, 2021, 07:38:36 am
content: Quote from: wraper on November 27, 2021, 03:42:18 pmI don't think I can find non-Chinese-made adapter locally. I don't even know if there are brands that make reliable adapters. I remember my friend had adapter with multiple plugs and could also switch voltages on it but it sounds less reliable due to being more intricate.

author: wraper
author_rank: Unknown
timestamp: November 28, 2021, 08:48:40 am
content: Quote from: Boris_yo on November 28, 2021, 07:38:36 amWhat do you think are you supposed to get for $3 including shipping?

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 28, 2021, 12:55:27 pm
content: Quote from: Boris_yo on November 27, 2021, 03:36:02 pmSome of them are low voltage for better safety. The ones that are direct mains powered would likely have built in GFCI nowadays.