Hi,
Be sure to have "END" set to "ALWAYS" before using GPIB. It needs to be
reset after a 3458A reset.
Charlie
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Hi Mark,
On my 3458a calibration short I use a short piece of #12 copper house
wire bent into a "C" shape that just drops into the banana jack holes.
It has the advantage low resistance with low thermal mass and the oxide
layer is broken when you tighten the nuts. HP recommended this in their
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You might give the Fluke extendable sharp point leads a try. They are
hardened enough to not bend with use like the knock offs. They are dear
at about $44 US so I am still regretting the untimely loss of the last ones.
Charlie
On 2/2/2016 8:10 PM, Mark Sims wrote:
I stopped by my favorite ele
Hi David,
My 720A's trimpots were original. I have them somewhere but they are a
bit scarce right now. Anyway they were 20 turn wire wound trimpots. I
suggest that you use wire wound ones and if 20 turn pots are not within
your budget then 10 turn will not be too much of an issue. On one or tw
Hi David,
I had to look it up. The company was Arrow (800 833 3557). The pots were
manufactured by Bournes with a manufacturer part number of 300SP-1-502.
Unit cost $7.73 in 2011. I bought 26 so my cost was about $200. I wanted
a "Manufactured in America" part but can't remember if that was to
Hi David,
I had the same problem with my Fluke 720A, among other problems. The
problem was the plastic for the adjustment pots had disintegrated with
age and a couple of them had quit working. I ended up fixing the unit
but removal of the bad pots made it obvious that the other "working"
pots
Hi Bob,
I would like to buy your 4812 DC Standard if it is not too expensive to
ship. I live in the US at zip 98261 (far N.W. in U.S.). Where is the
Standard located?
Charlie
On 8/21/2015 12:44 PM, Four Designs Company wrote:
I have an inoperative 4912 DC Standard for sale. The batteries ar
I use a digital temperature controlled bath for my keeping my standard
resistors at 25C. It's versatile since it can do precision
temperature/time scans and can easily scan the range your interested in.
Right now I have it set to 25.00C with one of my ancient 10K ohm standards.
When I first bo
It's D110 on PCB6. After removing D110 the 7081 read about +2.5
microvolt with the input shorted with an external jumper. When I
shorted the HI amp input with the MYTCHETT test point the 7081 read
about -1.0 microvolt with low noise. I expect that the D101 (DPAD1) is
the culprit.
Presently:
@perdrix.co.uk writes:
I might be worth asking eBay vendor LittleDiode, they are the eBay shop
for LittleDiode Components ...
Regards,
David Partridge
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles
Black
Sent: 31 October 2014 00:09
To: volt
My Solartron 7081 has a bad WR057 diode that needs to be replaced. It's
a three terminal device that looks like two silicon diodes in parallel.
It was making the meter read about 10.1V with a 10V input. Luckily it
was temperature sensitive and was easy to find with freeze mist. Removal
caused
unprecise. still tvcs are the most precise way to measure, if done right.
pretty tme consuming though. but you need them e.g. to calibrate a 4920.
adrian
Gesendet: Sonntag, 31. August 2014 um 21:41 Uhr
Von: "Charles Black"
An: "Discussion of precise voltage measurement&quo
and yes they need to be cal'd annually), another
4920 I came across had an intermittent failure in one of its power
supplies.
Kind Regards,
Stephen Grady
Sydney Australia
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles
Black
Sent: Monday, 1
annually), another 4920 I came across had an intermittent failure in one of its power
supplies.
Kind Regards,
Stephen Grady
Sydney Australia
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: b.
Hi Ben,
I am going to check this out today to find if it might be helpfull
around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got
Option 80, whatever that is.
Charlie
On 8/31/2014 5:37 AM, ben wrote:
Hello
lab temperature graph link come
through? Just checking as there has been some issues with the posts.
I don't like the "feature" where you don't see your own posts.
Don
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles Black
Sen
y have any additional useful info. I have been
meaning to have my TEMP? servoed some time in the near future. My TEMP?
runs about 37C at a room temp of 23C. Is your room temp a bit higher?
Charlie
On 8/29/2014 1:36 PM, Charles Black wrote:
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Hi Ken,
Nigel is setting you on the right track with Vectorbord. I have used
them for the edge connectors over the years with good results. I don't
know if you are able to use Digikey of not but they list a 3690-26 ($80)
that will be easy to modify to work for your project. I probably
should
My post on this thread earlier today seems to be lost (maybe the system
change) so I am re-posting some of it (corrected) since it's apropos to
the discussion.
Anyone who has calibrated (CAL 0 anyway) a 3458A has enough information
to deduce that lowest input short voltage is going to be a cop
I just realized that all my measurement tolerances are nV not pV. Sorry
about not checking units first.
Charlie
On 8/25/2014 9:50 AM, Charles Black wrote:
Hi Adrian,
Although I have not used the Pomona spade lugs or a nano-voltmeter, my
experience is consistent with yours otherwise
Hi Adrian,
Although I have not used the Pomona spade lugs or a nano-voltmeter, my
experience is consistent with yours otherwise.
Anyone who has calibrated (CAL 0 anyway) a 3458A has enough information
to deduce that lowest input short voltage is going to be a copper wire
since the meter is s
Hi Randy,
You can use the NPLC command to change the A/D converter's'integration
time. Set it to 1000 if you want full resolution. It sets the hp3458a's NMR.
Charlie
On 8/24/2014 6:04 PM, Randy Evans wrote:
Bill,
I am trying to figure out the MATH function without much success. I input
th
Bill,
I have never been able to use banana plugs of any kind, with my 3458A,
due to their excessive thermal mass. I use 24 gauge wires to make a
twisted pair by hand with no connectors for precision voltage work. As
brought out in an earlier post by acbern, it doesn't matter about
plating or
Hi Mark,
I had success using your HP3458.exe on my HP3458A! I just backed up my
CAL data a few minutes ago. I have been interested in doing a backup for
several years but kept putting off buying the GPIB to USB adapter. I
have been using a NI GPIB-ENET/100 for some years now and so your
progr
wrote:
I finally found it after I realized I had to select the LONG MENU first.
Thanks,
Randy
On Mon, Aug 18, 2014 at 7:27 AM, Charles Black
wrote:
Hit the grey key in the "FUNCTION/RANGE" key block. Then hit "T" (light
grey marking) in the "MENU" key block Then hit
Hit the grey key in the "FUNCTION/RANGE" key block. Then hit "T" (light
grey marking) in the "MENU" key block Then hit down arrow twice in the
"FUNCTION/RANGE" key block. You will now have TEMP? on the display. Then
hit the "Enter" key in the "NUMERIC/USER" key block. Now you should see
the TEM
Randy,
I have not been able to do accurate work with banana plugs. Too much
thermal mass. For best results use copper wires into the cross holes of
the banana jacks or small gold plated copper spade lugs crimped on the
ends of the test leads. Cheap at Radio Shack. Both work fine. Remember
t
Hi Roy,
I would like to second Todd's advice about leaving the Fluke 732A's
output voltage adjustment alone. You already have stable outputs and 24
microvolts high is very acceptable. My Datron 4910 (four output supply)
has predictable digital output level settings that doesn't have any luck
Hi Christopher,
I used some look alike NE-2's from ebay and they worked fine. Just
search for ne2.
Good luck!
Charlie
On 11/6/2013 2:34 AM, Christopher Brown wrote:
So, working on a couple of 845s.
The AR is a franken unit assembled from the parts of 2 damaged units.
Works well, but int
MK,
All you need to do is unplug the jones plug where the key wiring goes to
the circuit board. No need to do any wiring!
Charlie
On 1/15/2013 5:00 PM, J. L. Trantham wrote:
MK,
Where are you? If you can't get a key made, I can probably send you one.
IIRC, you can 'activate' the key by r
Original Message
Subject: Public Health Update: novel Corona virus update
Date: Fri, 05 Oct 2012 06:37:53 -0700
From: Frank James MD [1]
To: San Juan Medical Providers [2]
Much is still unknown and this virus does not appear to be easily
transmitted
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