Only one shorting plug is needed.
Regards,
David Partridge
-Original Message-
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On
Behalf Of Todd Micallef
Sent: 17 August 2014 02:29
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Guildline 9578 /
Randy
I would guess that your display is almost certainly 'on its way out'. I had
a new display fitted to my 3458A earlier this year and the difference is
astounding. The display is of the vacuum-fluorescent type, and they will
deteriorate over time, especially if your instrument was used in
Randy:
Look at page #23 of the 3458A Calibration Manual. Make yourself a 4
Terminal Short as shown and put it in as shown.
Before I did an ACAL I had around -000.00025 mVDC. After ACAL I now
read +000.2 mVDC. I did the CAL 0 myself so I would expect that the
meter should return to
Randy,
Two of mine read in the 3.7-3.8K range, another reads in the 4.2K range. It
is a good sign if the reading dropped in a few hours after turn-on. I
believe the lower thermistor readings indicate the older 732A oven. Some
minor changes were made and both manuals are available on Didier's
Randy:
I have 6 ea Fluke 732A instruments. The results of being an over the
edge and deeply obsessed Volt Nut, they just kept adding (reproducing?)
over the years. My readings for the themistors range from 3.407K OHMS to
4.514K OHMS and all work just fine. 3.6K OHMS would seem just fine to
Dave,
Thanks for the heads up. I went ahead and verified that all pins matched
the schematic by changing the cam to the four settings and all are as
expected. The new cams have 230vac printed on them and the old one has
220 vac.
I went ahead and installed the old one to prevent any future issues
Bill,
You are very helpful and I really appreciate it.
I entered BLUE-C-03458 and I still get the ERR message (106, OUT OF RANGE
-- CAL secured). That would be consistent with what you are saying. I
guess its no reason to panic yet.
I'm not sure how to use the SECURE command. I guess it's
Todd and Bill,
Thanks for the input. The 3.6 K thermistor reading seems viable and i will
pursue it further.
I may have over committed myself to modifying the HP-419A, the Fluke 845A,
buying the 3458A and looking at buying a Fluke 732A.
So much to do and so little time.
Thanks again,
Randy
That worked! Now it reads 000.00030mV. So far it looks good except for the
display.
Thanks,
Randy
On Sun, Aug 17, 2014 at 12:54 PM, Bill Gold wpgold3...@att.net wrote:
You need a comma , between the 0 and the 3458. So blu CCAL
0,3458 Enter.
See pg. # 64 of the CAL Manual for the
I do have an ESI SR1 10Kohm standard, but I'm not sure its accurate
enough...time to look around I suppose.
BTW, I understand that TV twin lead, the copper wire type, makes a good
test lead for the 3458 measurements. It seems reasonable, although the
leakage resistance might be questionable.
Randy,
Do you mean that you can select it, but it won't give you a temperature? Or
do you mean that you can't find it in the menu? If you go to the MENU
option, select FULL or something like that. It should enable all the extra
menus.
If you can see it, I believe all you have to do is find it
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