Agilent 6813B, Agilent 6573A broken by insulation test.  - Page 1
Forum section: electronics / testgear

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: September 06, 2018, 06:01:03 am
content: HiSome sparkys just did some rewiring work in our lab and I am pretty sure they have damaged our PSUs when they did their insulation testing.I have 2 x Agilent 6573B completely dead. (Hopefully a fuse inside). Anyone got a schematic?1 x Agilent 6813B that constantly reboots. Anyone got a schematic?They were all working last time I looked a few months ago, then the sparkies started work, a few weeks later the sparkies said one unit had stopped working.The next day 2 more units had stopped working.Luckily the biggest psu the 3 phase version of the 6813 is still fine.

author: ogden
author_rank: Super Contributor
timestamp: September 06, 2018, 06:23:57 am
content: First question here is: are they sparked equipment correctly? Ask them which standard(s) they tested against. Shall be UL 3111-1 (electrical equipment intended for professional, industrial process) or IEC 1010 or EN 61010. I am afraid that damage is far worse than just simply fuse. No, I don't have schematic and doubt any1 besides Keysight have. You shall start contacting their service or sales

author: Zucca
author_rank: Unknown
timestamp: September 06, 2018, 08:33:21 am
content: Were the devices on while the "sparkys" were playing?

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: September 06, 2018, 11:59:56 pm
content: I doubt they sparked (tested) the installation correctly as they damaged my power supplies.I am almost but not quite certain it is their fault. They did a good job otherwise and I want to stay on the right side of them. As they are nice and do a lot of work for us. Also two of them were quite young.The standard they test to is a local standard, named AS/NZS3000. Which probably has derived the insulation test based on some international standard.The test is pretty easy.Just Apply 500vdc (high impedance source) between each of the 'live' conductors(including Neutral) and Earth and make sure there is at least 1 Meg ohm of resistance.In Australia we have a slightly modified TN−C−S Earthing system. So at one point in the building the Earth is shorted to the Neutral.If the link between Earth and Neutral isn't disconnected before testing and your device in in circuit then you will get 500v into the device from Active to Neutral.I have myself once damaged an oven doing this test, so these days I am careful about it. Most devices wouldn't have a problem with this.One thing I forgot to mention was that the devices are hard wired in, and have circuit breakers in, the AC devices have RCDs on the output.They all have power into the box.I was hoping they were galvanically isolated but now I am not so sure.I had a quick look for schematics but haven't found any yet.

author: tombi
author_rank: Regular Contributor
timestamp: September 07, 2018, 01:30:10 am
content: So you don't mean 6573A? There is a service manual with schematic on the Keysight page.https://www.keysight.com/en/pd-839233-pn-6573A/2000-watt-power-supply-35v-60a?pm=PL&nid=-32611.384516&cc=AU&lc=engDitto the 6813Bhttps://www.keysight.com/en/pdx-2755769-pn-6813B/performance-ac-power-source-1750-va-300-v-13-a?pm=rsc&nid=-32114.1216486&cc=AU&lc=eng

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: September 07, 2018, 03:23:07 am
content: oops yes I did mean 6573A and I think that is why I could not find the manual.will update titlelooks like there a few internal fuses to check.fingers crossed.

author: heize0
author_rank: Contributor
timestamp: November 28, 2023, 12:56:16 pm
content: Hi! Have you back-up the firmware in EPROMs? I have this one but unfortunately it could not power up and only can display shift if I pressed the shift button. I'd like to repair it. I suspect the program is corrupted.I have seen the service manual. I checked the signals followed the instruction and found that there was no UART signal from the DSP. I tried to switch on and off many times and there was only one time the display segments were all lit up. More situations were either the shift could light up or the keyboard had no response.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 28, 2023, 10:55:06 pm
content: Sorry I do not have a backup of the firmware.