Rectifier Bridge - Page 1
Forum section: electronics / beginners

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 01:00:05 am
content: Should I have continuity across the + and - terminals? GBU1006https://www.diodes.com/assets/Datasheets/ds30052.pdf

author: mmagin
author_rank: Frequent Contributor
timestamp: April 27, 2017, 01:13:20 am
content: In one direction, not in the other.

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 01:20:11 am
content: Set to V_diode test on the meter. ~0.6V from AC to + or - and 1.2V from + to - Pos of meter on the Anode, Neg on the Kathode

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 01:34:18 am
content: DMM reads "959" when I place the +probe on -terminal of the bridge and -probe on positive terminal of the bridge. Reversing probes give me "1" on my meter

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 01:42:58 am
content: Across + and - terminals of the recitifier bridge I have 26 M ohms in one direction and 1.7 M ohms in the other direction.

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 01:50:20 am
content: We can't work out from that. You need to use the Diode_Test mode on the meter.Sometimes, you select resistance first, then press a Mode or Range button, until you see a diode symbol or text in the window.Your looking for Voltage drop. The bridge may have leakage (resistance), and still be fine.

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 01:54:20 am
content: Quote from: digsys on April 27, 2017, 01:50:20 amIn diode test mode the DMM reads "959" when I place the +probe on -terminal of the bridge and -probe on positive terminal of the bridge. Reversing probes give me "1" on my meter?

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 02:05:00 am
content: Quote from: OpenCircuitUnfortunately, that doesn't make any sense at all. Those readings are too strange. You would need to post a pic of the setup, with the meter and the connections to the bridge, andshowing the identification. Doesn't need to be too large, just readable.

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 02:19:06 am
content: Quote from: digsys on April 27, 2017, 02:05:00 amThis meter has recently been described as "less than ideal" I am not so kind when I reference this meter.Left pin on bridge is neg and right is pos

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 02:59:23 am
content: Couldn't find the manual on-line anywhere. It doesn't seem to be in Diode_Test mode. There should be a icon of a diode on the LCD. That range seems to have 3 settings, usually you togglethrough them with one of the other buttons. It seems to be in buzzer / 3rd? mode. Hopefully, someone else will have a better idea on that meter. Sorry

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 03:08:23 am
content: Quote from: digsys on April 27, 2017, 02:59:23 amI think the bridge is OK. Thanks for trying to help. Chasing down a short on circuit board....https://www.manualslib.com/manual/1049274/Etek-10709.html

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 03:42:33 am
content: Quote from: OpenCircuitYeah, I saw that pdf, but it was really poor to read, so I was looking for a better copy. Having a look, a 1 is open cct, the voltage drop may be 0.959? =2 diodes.

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 27, 2017, 04:35:11 am
content: Seriously considering the UT61E.

author: digsys
author_rank: Unknown
timestamp: April 27, 2017, 05:42:24 am
content: Another option - If you have a power supply - Set to say 5V, current limit to 20-50mA (or use a ressitor) - connect it across the bridge and simply measure the voltage dropacross each diode. They should all be very similar. You may need to do each one separately.

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: April 27, 2017, 07:40:45 am
content: In forward your DMM is measuring 964mV, in reverse the 1 signals that it's "Out of range" because it can't measure it.