Strange ESI RV722 for sale on ebay - Page 1
Forum section: electronics / general

author: Macbeth
author_rank: Super Contributor
timestamp: April 07, 2016, 09:37:29 pm
content: On ebay,an ESI RV722  for sale, whatever that is - perhaps a custom produced item?Now what on earth are the Centronics connectors on the back for?

author: Vgkid
author_rank: Super Contributor
timestamp: April 07, 2016, 10:20:31 pm
content: Interesting, I saw that one as well.If it was a longer unit, possibly computer driven remote operation. I know GenRad produced some decade resistance/capacitance boxes.

author: babysitter
author_rank: Frequent Contributor
timestamp: April 07, 2016, 10:22:11 pm
content: Hopefully just each switch sandwiched to a second switch to report their positions, and no real meddling with the divider circuit.Maybe there might be even little motors to turn the switches remote-controlled.Low speed RDAC

author: Vgkid
author_rank: Super Contributor
timestamp: April 07, 2016, 10:40:56 pm
content: Quote from: babysitter on April 07, 2016, 10:22:11 pmThat is how it was donein the Genrad box that was listed for parts. You could see the motor/gearbox, couldnt see the encoder/position sensor.

author: lowimpedance
author_rank: Super Contributor
timestamp: April 08, 2016, 12:23:44 am
content: In the close up pic of the rear connectors you can just see some faint 'scribe' lines for the cut out where the connectors fit through, so my guess is an user mod for positional readout !.Also the old catalogues make no mention of any variations on the standard box, ie options like motorized or otherwise. (not to say the custom mod was not from ESI itself though)

author: Macbeth
author_rank: Super Contributor
timestamp: April 08, 2016, 12:33:27 am
content: From what I have seen of the RV722 there shouldn't be any room for such shenanigans.Now I have the little brother the RV622A and there is enough room for me to fit a PSU, 10V ref, perhaps a x10 1000V amplifier, etc. Yes, I have considered a microcontroller and stepper motors tooAlso those front panel digits can be backlit with SMD LEDs...But I would want to retrofit all that without ruining the original which appears to be older than me.

author: mathsquid
author_rank: Frequent Contributor
timestamp: April 08, 2016, 02:03:25 pm
content: Quote from: Macbeth on April 07, 2016, 09:37:29 pmTo hook up three printers?

author: casinada
author_rank: Frequent Contributor
timestamp: April 11, 2016, 07:32:27 am
content: http://www.linear.com/solutions/1020

author: PA4TIM
author_rank: Super Contributor
timestamp: May 14, 2016, 03:38:39 pm
content: http://www.pa4tim.nl/?p=2723pictures from the inside of my Decavider. A "normal" RV722. But mine does not have the extra SP2665 label.

author: Macbeth
author_rank: Super Contributor
timestamp: May 14, 2016, 04:55:54 pm
content: It doesn't look like it has room for much extra in there either, compared to my RV622A (100k, 700V version)

author: manganin
author_rank: Regular Contributor
timestamp: June 17, 2016, 07:38:12 pm
content: Fluke 720A Kelvin Varley dividerwww.ebay.com/itm/291794961329$129.95More than 10 available...

author: Vgkid
author_rank: Super Contributor
timestamp: June 17, 2016, 09:38:54 pm
content: Must have been a listing error. Says unsold...

author: e61_phil
author_rank: Frequent Contributor
timestamp: June 18, 2016, 09:19:54 am
content: Unfortunately, shipping to germany is quite expensive. The seller answered this morning. It seems there are some 720 left.

author: manganin
author_rank: Regular Contributor
timestamp: June 18, 2016, 11:49:35 am
content: Quote from: Vgkid on June 17, 2016, 09:38:54 pmThere seems to be some sort of stock clearance going on.There is no professional use for these anymore i.e. buyers who are willing to pay more than it costs to test and refurbish.I hope that posting the link here helped, and as many as possible ended up to the forum members.

author: TiN
author_rank: Super Contributor
timestamp: June 18, 2016, 12:24:42 pm
content: I sent them a message if they have any for sale. Will see how it goes. $130 I could risk for 720A...

author: e61_phil
author_rank: Frequent Contributor
timestamp: June 18, 2016, 08:56:57 pm
content: Quote from: EmmanuelFaure on June 18, 2016, 11:22:27 amThe seller talked about 450$ shipping

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: June 20, 2016, 08:54:54 pm
content: Quote from: manganin on June 17, 2016, 07:38:12 pmThey are back...

author: Vgkid
author_rank: Super Contributor
timestamp: June 20, 2016, 09:39:45 pm
content: Quote from: ManateeMafia on June 20, 2016, 08:54:54 pmand they are gone...