EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: volvo_nut_v70 on September 11, 2019, 07:22:59 pm
-
Hello;
I have just bought a Datron 4707 with option 17 and 27. I am new to Datron calibrators, is there much different between the 4707 and 4708?
Is there such a thing as a Datron 4707 manual set? My searches of the internet came up empty...
Thanks in advance!
-
If you have the unit open it up and take a picture of the boards and post it. You can also remove the reference board to see what ref it has installed.
The 4707 option #'s seem totally different compared to a 4708.
Well it seems option 17 and 27 are the options you need for a loaded unit.
The specifications are quite a bit weaker then a 4708 though.
Edit - You've likely already found pictures but this is what a loaded 4708 looks like:
-
Hi;
I haven't received the unit yet, in transit. I couldn't find a 4708 with 10,20,30 for a reasonable price so I thought I'd give this one a go. It is supposed to be fully functional.
I'll take some photos of it when it arrives and do a listing of board part numbers. Like you I suspect any accuracy differences will probably lie in the reference board. It seems like Datron kept a lot of commonality between the various 4XXX units... or am I wrong on this?
Thanks, Ken
-
I haven't come across any photos or tear downs yet, would you have a link?
-
I've only found the datasheet for the 4707.
I suspect you will find they are very similar. I am thinking the 4707 might have the 8 diode based main reference instead of the LTZ1000 and the various resistors for the voltage dividers/ohms/current aren't spec'd quite as good as they were in the 4708.
Unless the previous owner did rework on it I recommend changing many tantalum capacitors and all electrolytics before it goes up in smoke.
-
Is there any photos/tear downs for the 4708? I haven't come across any (except the xdev 4808 series)
-
Sigh just noticed your thread on your 4708 adventure. |O I'll blame my oversight on not enough coffee! :)
Do you have a BOM for all the tantalums and electrolytics you replaced?
Also would you have an original manual that you could scan page 4-6 since all the 4708 manuals must share a common heritage since the ones I have looked at have the same scanning error.
Did you ever source a LTZ1000 ref?
-
I didn't make a detailed list of parts that need to be replaced. I can probably look up my Digikey order though and tell you what I ended up buying. Other then a few caps every electrolytic I could find was replaced and 40-50 tantalums(which isn't all of them). The biggest problem are the ones on the +-15 volt power rails, they love to glow orange and go crispy right before your eyes.
I don't have an original manual and have just used whatever xDevs had.
I did get an LTZ1000 ref, however it came with another entire 4708. :)
-
Hi Steve;
If you wouldn't mind looking up the order that'd be great as a start point. Did you follow what seems to be conventional wisdom in increasing the voltage rating double what it is spec'd for? Any thoughts on brand... I spent a long time chasing shorted tants on my Fluke 5100 and a Fluke 6071 RF gen
The corrected Page 4-6 of the op manual is attached, courtesy of a kind fellow in Australia. I am going to fix the 3 variations of op manuals I have found on the web and repost it.
Lucky guy picking up the 4708 :) , I've just seen silly priced ones on Evilbay..... hence the 4707...
-
The caps on the +-15 volt lines are mostly rated for 25 volts, I upper them to 35 volt. You could go even higher in voltage but the odd one won't fit well and the price really climbs. I don't recall the brand, I just went with a name I recognized.
If the unit is supposed to be working I'd give it a quick test and then open it. Pull each board one at a time and inspect them. You will see tons of the yellow blobs staring back at you. Take some pictures and post them. I can send you a list of the caps I bought but you'll want to verify they match up before you order as some of your boards may be different. You may also want to replace every single tantalum cap - but only the ones directly on the rails seem super failure prone.
I did get lucky finding the second 4708, it was a parts unit the same as the first but needed minimal repair beyond changing the caps.
-
I'll definitely take photos and do a inventory/catalogue of card part numbers to see what differs from a 4708. Your parts list will at least give me a start.
If you ever come across another cheap 4708..... ;D
Do you have photos of your 4708?
-
I'm in search of a "cheap" 4808 now to go with my 1281. So far it seems unlikely to happen.
Pretty sure I did take pics of each card but I'll need to go back through my pics and check.
The 4708 service guide will also give you a good idea of what each card looks like. I would think they will look nearly the same, just resistors and a ref with different specs.
I assume you're back east and not in the Vancouver area.
-
I'm in Burnaby ... :)
-
My 5100 knows some things up, it died this morning :-[
-
Looking through my Digikey orders I found this list of parts.
Some quantities are higher then you need of course, I just bumped it to 10 for pricing reasons.
The factory fan is quite loud, this replacement is nicer and keeps temps fully under control(still not quiet).
The last one is the power switch, I had one get a little flaky on me. It is an exact match for the original if do you happen to need one and will not be stocked when they sell out.
Wear gloves at all time when working on the boards.
And it is nice to know there is someone else local to me with Datron goodies(I'm in Langley).
478-6062-ND TAP106M035SCS CAP TANT 10UF 20% 35V RADIAL x 40
478-6015-ND TAP226K035CCS CAP TANT 22UF 10% 35V RADIAL x 10
478-1897-ND TAP336K035CCS CAP TANT 33UF 10% 35V RADIAL x 10
P10333-ND EEU-FC1H102 CAP ALUM 1000UF 20% 50V RADIAL x 10
P10352-ND EEU-FC1J471 CAP ALUM 470UF 20% 63V RADIAL x 4
4498PHBK-ND MAL214651101E3 CAP ALUM 100UF 20% 50V RADIAL x 1
493-15864-ND UPS2A331MHD CAP ALUM 330UF 20% 100V RADIALx 2
493-12177-1-ND UPW2V220MHD1TN CAP ALUM 22UF 20% 350V RADIAL x 2
P19551CT-ND ECA-2AHG100B CAP ALUM 10UF 20% 100V RADIAL x 10
1570-1015-ND UF12A12-BTLR FAN AXIAL 120X38MM 115VAC x 1
432-1141-ND 1M1-DP1-R1/2-M1QE SWITCH ROCKER DPDT 5A 125V x 1
-
Thanks!! Much appreciate it. My stuff covers Tek, HP, Wavetek, Keithley , Sencore and now Datron...
The Sencore is their LC meter and stereo amp load. I heartily recommend a LC77, LC102 OR LC103 depending on your budget. LC77 and LC102 are the same unit,the 102 has a flashing LED warning about voltage on the leads
-
I forgot to ask, are the eproms for the 4708 out on the web?