haven't contacted them
directly.
Thanks,
Randy Evans
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. Just
send me an e-mail request.
Randy Evans
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John,
I looked at the LTC2057 but it doesn't go down to 3V operation (4.75 V min) and
I want to power the Fluke 845 with 3V lithiums. In addition, the LTC2054 has a
lower input bias current (1 pA at 25 C). I wanted the lower bias current since
I want to use the circuit to upgrade an HP-419A
Frank,
The specs for the ICL7650on page 3 of the data sheet show a max bias current of
200 pa AT 85C (the ICL7650b is no longer available), higher than the LTC2054 at
150 pA at 150C. The 845 will not be operating higher than 40C ambient, for a
typical test lab environment, and the temp rise
Charles,
I looked over the list of videos on eevblog but I didn't see anything on Datron
equipment. The list is not indexed so I had to manually search the list. I
looked several times to no avail. Do know which episode it was?
Randy Evans
--
On Thu, Jan 9
Charles,
I did find some information in the thread.
thanks,
Randy
On Thursday, January 9, 2014 5:33 PM, Charles Steinmetz csteinm...@yandex.com
wrote:
Randy wrote:
Does anyone have sources for the Fluke 5440 manual and the Datron
4910 manuals with schematics. I looked on K04BB's site
Does anyone know the manufacturer and part number of the connectors used on the
HP-3458 voltage reference board?
thanks,
Randy Evans
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, 2014 7:44 AM, Bill Gold wpgold3...@att.net wrote:
update
The HP/AGILENT/KEYSIGHT P/N is 1251-6041 and is in stock at $5.13 ea.
Bill
- Original Message -
From: Bill Gold wpgold3...@att.net
To: Randy Evans randallgrayev...@yahoo.com; Discussion of precise
voltage measurement volt-nuts
We'll all probably want a spare unit also.
On Friday, February 14, 2014 11:02 AM, Tom Miller tmiller11...@verizon.net
wrote:
Can we get a group buy?
- Original Message -
From: Tom Knox act...@hotmail.com
To: volt-nuts@febo.com
Sent: Friday, February 14, 2014 12:50 PM
Subject:
voltage.
-Chuck Harris
Randy Evans wrote:
I have a Datron 1082 DMM that just recently stopped working. When I
power
up, it gives a FAIL message on the front panel. I found a flowchart
in
an abbreviated servicing manual that indicates it's from a failure of
the
Check
find
the part number in the 1071 parts list. Does anyone know the part number
of the memory battery in the 1082 or 1071, or the characteristics; e.g.,
voltage and A-H rating?
Thanks,
Randy Evans AE6YG
On Mon, Apr 21, 2014 at 8:32 PM, Tom Knox act...@hotmail.com wrote:
Sorry I wasn't clear. I
I just took out the battery and it is a Tenergy 3.6 VDC 1200mAH ER14250
with tabs welded on.
Randy
On Tue, Apr 22, 2014 at 9:08 PM, Randy Evans randyevans2...@gmail.comwrote:
Todd,
That does look like the battery in my 1082. I don't see any markings on
the battery in my unit but I can't
Here is a link to a book from Fluke titled 'Calibration - Philosophy in
Practice'. A little dated (1980) but interesting to read.
*https://archive.org/details/Calibration-PhilosophyInPractice
https://archive.org/details/Calibration-PhilosophyInPractice*
Randy Evans
they will take a few missing screws and
such. My experience with them is they charge the same no mater what need to
be fixed. Not sure what the price is, there prices are country dependent. I
thought it was a little more than $2200 last I checked.
On Sat, Jul 5, 2014 at 4:08 PM, Randy Evans
That is an assembly but I am looking for an individual relay part that I
can put on a PCB.
Randy
On Fri, Jul 11, 2014 at 7:15 AM, Wim de Jong wim.de.jong...@solcon.nl
wrote:
The http://www.transmille.co.uk/8500.htm
Wim de Jong
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matched resistor pair,
hopefully not too expensive?
Thanks,
Randy Evans
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Frank,
The high cost is my concern, although high performance demands high price
typically. I am trying to double the voltage reference from either an
LM399 or LTZ1000, hence the need for precision matched resistors for a x2
non-inverting amplifier (using a LT1151 precision op amp). An
I figured out that VPG is Vishay Precision Group but I have not managed to
identify the vhd hermetic divider. Could you point me to the location on
the Vishay web site?
Thanks,
Randy
On Fri, Jul 18, 2014 at 9:00 PM, Randy Evans randyevans2...@gmail.com
wrote:
I am not familiar with vpg
Randy Evans:
Andreas,
That is good information, I appreciate it. I have contacted LT
application
support but they have yet to get back to me on my questions except they
did
recommend to use the LTC6943 instead of the LTC1043. Later generation I
guess.
I think i am going to try both
-calibrator/
http://www.eevblog.com/forum/projects/ppmgeek!-5-5-digit-
dvm-volt-ref-cal-%28for-arduino-or-any-uc-w-spi%29/msg296127/#msg296127
With best regards
Andreas
Am 19.07.2014 16:33, schrieb Randy Evans:
Andreas,
Thanks for the information. Do you have the drift chart, etc. posted
Andreas,
Of course, I would also expect the leakage currents to change over
time/temperature and I would expect them to be the dominant error source.
Randy
On Mon, Jul 21, 2014 at 9:38 AM, Randy Evans randyevans2...@gmail.com
wrote:
Andreas,
Since you are familiar with the LTC1043, do you
. Juli 2014 um 20:28 Uhr
Von: Bob Smither smit...@c-c-i.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Betreff: Re: [volt-nuts] Matched resistors
On 07/17/2014 10:26 AM, Randy Evans wrote:
Frank,
The high cost is my concern, although high performance demands
probably don't need to know
the temperature tracking coefficient to better than 20%.
Component layout would need to ensure any thermal gradients apply equally
to both legs of the divider by interleaving upper and lower resistors.
Tony H
On 17/07/2014 16:26, Randy Evans wrote:
Frank
Tony,
I should have mentioned that I am primarily referring to stability, not
accuracy. As i stated before, accuracy is relatively unimportant but
stability is essential.
Randy
On Wed, Jul 23, 2014 at 8:22 PM, Randy Evans randyevans2...@gmail.com
wrote:
Tony,
Your improvement factor
Tony,
Sorry for not reading further. I will give it some thought. Interesting
idea.
Randy
On Thu, Jul 24, 2014 at 5:13 AM, Tony Holt vn...@toneh.demon.co.uk wrote:
Randy,
On 24/07/2014 04:22, Randy Evans wrote:
Tony,
Your improvement factor of SQRT(n) assumes that each resistor
I would like to thank all those you supplied ideas for matching resistors.
I have decided to test three approaches for now, the first is using Vishay
vhd200 hermetically sealed foil resistors (three each at around $26 each),
the second is using LTC5400 resistor arrays, the third is a hybrid
, schrieb Randy Evans:
I would like to thank all those you supplied ideas for matching resistors.
I have decided to test three approaches for now, the first is using
Vishay
vhd200 hermetically sealed foil resistors (three each at around $26 each),
the second is using LTC5400 resistor arrays
support for it
was dropped long before 1993. It would be interesting to see how many of
the original parts were removed and how this new board was mounted inside
the AB chassis.
Todd
On Fri, Aug 8, 2014 at 10:23 PM, Randy Evans randyevans2...@gmail.com
wrote:
For those interested, I have
noticed when I push the auto zero
button, the display has a blinking square until I hit a measurement mode
button; e.g., DCV, ACV, OHM, etc. Is this normal?
Regards,
Randy Evans
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. #8 for how to get inside of
the meter. You will need two sizes of a PosiDrive type screwdrivers to
accomplish this. Again in the Cal Manual.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent
important.
Fluke says that it could change as much as 10 ohms per month but mine are
rock solid for years and years.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: volt-nuts@febo.com
Sent: Sunday, August 17, 2014 11:08 AM
Subject: [volt-nuts] Fluke 732A
for the syntax.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Sunday, August 17, 2014 12:25 PM
Subject: Re: [volt-nuts] RE new 3458A
Bill,
You are very helpful and I really appreciate it.
I
.
Randy
On Sun, Aug 17, 2014 at 1:36 PM, Todd Micallef tmical...@gmail.com wrote:
Randy,
Next thing you know, you will be looking at a 10K standard resistor to go
with that 3458A and possible 732A.
Todd
On Sun, Aug 17, 2014 at 3:51 PM, Randy Evans randyevans2...@gmail.com
wrote:
Todd
Mark,
I just ordered the ProLogix USB-GPIB converter specifically to read the
contents of my 3458A. Would it be possible to get a copy of your program
that you wrote to read the memory contents. It would be greatly
appreciated and save me a lot of work and frustration.
thanks,
Randy
On Wed,
I received my Fluke 732A today. Just powered it up but it needs new
batteries. Any suggestions for sources (I haven't opened up the unit yet -
I want to make sure it works before doing that). Also received the
ProLogix USB-GPIB adapter. I plan on using Mark Sims' CAL ran data dumper
program to
I hope someone can help with a strange anomaly on either my 3458A or the
732A. The 732A 10V output as measured on my 3458A seems relatively stable
over time (it bounces around about +/-1 uV but is it the 732 or the 3458?).
However, the 1.000 VDC output drifts downward at a rate around 1-2 uV per
in
the leads.
I hope all of this helps.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Friday, August 22, 2014 9:03 PM
Subject: Re: [volt-nuts] 732A and Prologix received
Todd
for several minutes after plugging
in
the leads.
I hope all of this helps.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Friday, August 22, 2014 9:03 PM
of the data
you
can collect. That was after waiting for several minutes after plugging
in
the leads.
I hope all of this helps.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts
detailed sometimes.
Bill
- Original Message -
From: Randy Evans randyevans2...@gmail.com
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Sunday, August 24, 2014 7:22 AM
Subject: Re: [volt-nuts] 732A and Prologix received
Bill,
I have convinced myself
For some reason I can no longer access the Volt-Nuts web site. Has
anything changed on the permissions list? Is anyone else having this
problem? I get the following message:
You don't have permission to access /pipermail/volt-nuts/ on this server.
Thanks,
Randy
on the
display it is done. But then with 1000 PLC that is around 16.66 seconds
per
reading times 100 readings is somewhere around 28 minutes and there is
probably some overhead time so around 30 minutes. Not from the front panel
at any rate.
Bill
- Original Message -
From: Randy Evans
, 26. August 2014 um 04:23 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Betreff: Re: [volt-nuts] 732A and Prologix received
Is there any way to tell when the function key routine is complete? In
the
case of taking multiple
I forgot to mention that I reduced the number of measurements to 100 per
set since I wasn't seeing much difference in the variance between 100 and
1000 measurements and the 1000 measurement per set takes too long.
Randy
On Wed, Aug 27, 2014 at 5:13 AM, Randy Evans randyevans2...@gmail.com
wrote
(these guys told me), but the 732a is
certainly very stable short term compared to a 3458a. my 732a e.g. has a
drift of 0.2ppm per year.
Gesendet: Mittwoch, 27. August 2014 um 14:36 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
with a josephson element (these guys told
me), but the 732a is certainly very stable short term compared to a 3458a.
my 732a e.g. has a drift of 0.2ppm per year.
Gesendet: Mittwoch, 27. August 2014 um 14:36 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage
of the readings are around 10.58 VDC but neither
unit is calibrated. I assume they can be calibrated but I wanted to make
sure they are stable first.
Do these numbers look reasonable and do they indicate any issues with the
units?
Thanks,
Randy Evans
___
volt
I checked my 3458A and it says that the Rev is 8.2. What can I infer about
the unit? I have not opened it up yet to check the status of the NVRAM
since I am waiting for the posidrive tools.
Randy
On Sun, Sep 21, 2014 at 9:20 AM, J. L. Trantham jlt...@att.net wrote:
Not in front of my meter
Does anyone have a spare connector plug for the 732A external battery
connector that they would be willing to sell. Or conversely, a good Fluke
PN for the connector ( I saw several in discussions but I'm not sure which
is the best part number to use).
Thanks,
Randy Evans
Charles,
Thanks for the update. I was able to get a cable plug set from Todd
Micallef.
Randy
On Mon, Oct 20, 2014 at 6:23 AM, Charles Steinmetz csteinm...@yandex.com
wrote:
Randy wrote:
Does anyone have a spare connector plug for the 732A external battery
*** ( I saw several in
chopper. Any help or made expericance would perfect.
BR
Ludger / PeLuLe
*Gesendet:* Samstag, 09. August 2014 um 03:23 Uhr
*Von:* Randy Evans randyevans2...@gmail.com
*An:* Discussion of precise voltage measurement volt-nuts@febo.com
*Betreff:* Re: [volt-nuts] HP-419 and Fluke 845 Modifications
inverter circuit in place, you can easily derive
any voltages (+ and -) that your mod needs from it, without the need for
additional isolated power supplies
Dave M
Randy Evans wrote:
I finished the H-419A/Fluke 845A design modifications but I am still
trying to decide on the preferred
.
This was the driving source for my mod,
Dallas
Randy Evans wrote:
I finished the H-419A/Fluke 845A design modifications but I am still
trying to decide on the preferred power supply design. The basic
meter circuit uses the LTC2054 and LTC6255 with two CR123 Li-Ion 3 V
batteries
to the
connector. The only downside would be no resale to a purist who wants to
run with the David Wise HP H11 linear optocoupler/photochopper replacement
(see HP yahoo group for HP740b ).
Just curious,
Stan
On Wed, Nov 26, 2014 at 12:18 PM, Randy Evans randyevans2...@gmail.com
wrote:
I have finished
Thanks Jan,
These plots should prove very useful.
Randy Evans
On Sun, Feb 15, 2015 at 4:12 AM, Jan Fredriksson j...@41hz.com wrote:
It's reply #984 in the thread. See also #982
http://www.eevblog.com/forum/projects/ultra-precision-reference-ltz1000/msg605967/#msg605967
Direct to plot file
I bought two HP-3458A ref boards from John Daly (he no longer has any more)
and they worked fine but have intermittent noise bursts. I suspect they
were rejects from HP/Agilent. At some point I will probably replace the
LTZ1000As and reduce the internal temperature set point for better
The reference module is in a metal box and uses an external linear PS with
internal separate regulation. I don't think its external EMI, but anything
is possible.
Randy
On Wed, Jan 28, 2015 at 10:28 PM, Hendrik Dietrich don_he...@gmx.de wrote:
Am 29.01.2015 04:07, schrieb Randy Evans:
I
This is indirectly pertinent to the group since I am designing a PCB for
the HP-419A and Fluke 845A modifications. Does anyone have any
experience/comments on the Design Spark PCB design package? Is is a viable
package for hobbyist use?
thanks,
Randy Evans
Jan,
Would you please post the link to your plot? I searched but haven't found
it yet.
thanks,
Randy Evans
On Thu, Feb 12, 2015 at 3:51 AM, Jan Fredriksson j...@41hz.com wrote:
I posted a plot of calculated resistor values versus temperature in
the LTZ1000 thread on the EVV blog yetserday
FYI,
I contacted Keysight and found the exchange program is still in place. The
PN is 03458-69517 and the price is $278.
Randy Evans AE6YG
On Wed, Apr 15, 2015 at 12:05 PM, Randy Evans randyevans2...@gmail.com
wrote:
I need to replace the display board for my HP-3458A (several dim
Date: Wed, 15 Apr 2015 14:39:38 -0700
From: randyevans2...@gmail.com
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] HP-3458a display board
FYI,
I contacted Keysight and found the exchange program is still in place.
The
PN is 03458-69517 and the price is $278.
Randy Evans AE6YG
Frank,
Thanks for the data. The 100K seems acceptable since I have a Fluke 732A
to recalibrate the 3458A with after the change and the 3458A is not in a
rack.
Randy
On Tue, Jun 2, 2015 at 2:50 PM, Frank Stellmach frank.stellm...@freenet.de
wrote:
Hi Randy,
in advance, this change only
the design a bit.
Hopefully I created the link correctly. Let me know if you have any issues
with the link.
https://www.dropbox.com/sh/7b3hsy0j0wq35hw/AABkmVptTwVu2EJFRqtSdAjya?dl=0
Randy Evans AE6YG
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you post a higher resolution image of the markup
details? Don't really need the full schematic, just the areas where the
connections to the new circuit are made.
Thanks again,
Dave M
Randy Evans wrote:
I have created a shared link to my working folder with the details of
the HP-419A
but I am
confused how to use it (I want to back up my HP-3458A before I attempt to
replace the display board).
thanks,
Randy Evans AE6YG
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that looks like it would work really well, but I have no idea
what it is. Does anyone have any suggestions?
Thanks,
Randy Evans AE6YG
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Frank,
I don't plan on operating at 80C. I just want an insulation that can
withstand up to 80C so i have a safety margin. 45C is probably too low for
my environment but 50C might be doable.
Thanks,
Randy
On Tue, Jul 7, 2015 at 12:29 AM, Frank Stellmach frank.stellm...@freenet.de
wrote:
I used a 12 AWG wire formed into a U shape for the short and the zero
voltage measured less than 0.2 uV after a good 2+ hour warmup. However, I
am seeing drifts of several uV for the 752 calibration. I was using TV
twin lead to connect the 732 to 752 and 752 to 3458A since that's really
all I
A bit of a false lead. I took the readings after an hour of warmup.
However, after about two hours, the zero reading went to less thatn 0.2 uV,
which seems just fine to me. I guess i just needed to get a really good
warmup time.
However, the 752 readings are varying over several uV when doing
I shorted the input terminals of my HP-3458A with a short lead of copper
wire, Bell telephone wire as recommended in the manual. The reading I get
is around 000.00070 mV, or 0.7 uV with NLPC set to 100. I was trying to
evaluate it's use as a null meter for my Fluke 752A divider. This seems a
spade lugs (Pomona 2305 Low thermal EMF
spade lug, Gold-plated?). Any other suggestions?
Thanks,
Randy Evans AE6YG
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Illya,
Very interesting. The temco/stability data does not plot but the X-Y
format seems to be OK. Is it supposed to plot or do I have to plot it
myself with the csv data?
Thanks,
Randy Evans
On Thu, May 26, 2016 at 3:42 AM, Illya Tsemenko <il...@xdevs.com> wrote:
> I'm glad
Willy,
Where are you located?
Randy Evans
AE6YG
On Sun, Jan 31, 2016 at 11:49 AM, new <pit...@williams-net.com> wrote:
> I'm thinking of doing non-commercial 'calibrations' for
> folks like us volt-nuts.
>
> Since I have three 3458s, three 732As, a 732b, a 4214,
> an sr
Has anyone looked at the ADA4522 precision op amp from Analog Devices. It
looks very intriguing with it's extremely low offset voltage drift of 22
nV/°C maximum. The offset voltage is as high as 5 uV but this could be
nulled out and it should be very stable over temperature after that. It
could
I live locally and I am interested in the items. Do you have a complete
list available?
Randy Evans
On Apr 9, 2016 9:34 PM, "Demian Martin" <demianm@gmail.com> wrote:
> I have a number of precision bridges and the like that I really need to
> move
> on to a new ho
he manual increases the output resistance.
>
>
>
>
> > Gesendet: Freitag, 08. April 2016 um 03:35 Uhr
> > Von: "Randy Evans" <randyevans2...@gmail.com>
> > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com>
> > Betreff:
KiCad looks very good and I downloaded it to try it out. However, does
anyone have a good, low-cost PCB fab house to recommend? I am designing a
voltage reference programmable fro 0 to 10 volts with a LTZ1000 reference
and settabiltiy of 0.1ppm and I need a PCB fabbed.
Thanks,
Randy Evans
FYI, I bought two of these used 3458A reference boards for $85 each a few
years ago and they both experience noise bursts. I plan on replacing the
LTZ1000 chips on them (sometime in the near future).
Randy Evans
AE6YG
On Sun, Mar 12, 2017 at 10:53 AM, m k <m1k...@hotmail.com>
.
However, this would imply an 8pA bias current, which is much higher than
expected. My question is: does anyone else have a better explanation for
this issue and does anyone experience this issue with the original circuit?
Thanks,
Randy Evans AE6YG
Charles,
You are absolutely correct. I misread the data sheet. It's interesting
that all three LTC1050s behave exactly the same. They have the same lot
code number.but I would expect more variation. Live an learn.
Randy
On Thu, Apr 27, 2017 at 12:18 PM, Charles Steinmetz
It looks like a better candidate would be the LTC2054, which has a typical
bias current of 1 pA at 25C and is essentially constant up to 45C.
Randy
On Thu, Apr 27, 2017 at 5:02 PM, Randy Evans <randyevans2...@gmail.com>
wrote:
> Charles,
>
> You are absolutely correct. I misread
Frank,
The 8 pA bias current is well within the spec for the LTC1050 (+-10pA
typical, worst case +-50pA at 25C) but I was surprised about the lack of
variation. I also tried an "air bridge" wiring from the 887 filter to the
LTC1050 to avoid any leakage of the circuit board. It made no
Bob,
I am interested in the Keithley if it is still available.
Thanks,
Randy Evans
On Thu, May 4, 2017 at 1:09 PM, Four Designs Company <
fourdesi...@comcast.net> wrote:
> Greetings all:
>
> I am offering a Keithley 2000 6-1/2 digit DMM for sale. This instrument is
> from m
access."
There have been documented cases where the new DS1220AD part will not work
in circuits designed with the DS1220Y (now discontinued).
I would like to know if anyone has successfully utilized the DS1220AD
before proceeding to buy the parts. Similar question for the DS1230Y and
D
drifty component. Good stable 3458A
stable to <0.2ppm over week.
On November 24, 2017 9:32:30 AM GMT+08:00, Randy Evans <
randyevans2...@gmail.com> wrote:
>
> Illya,
>
> Can you explain why you say " If ACAL DCV does not remove drift then A3
> is probably fine&quo
may have been serviced at some time.
>
> On November 24, 2017 8:40:00 AM GMT+08:00, Randy Evans <
> randyevans2...@gmail.com> wrote:
>>
>> Illya,
>>
>> I ran the test you suggested over 4 days and got 7.19114068 VDC on the
>> start of the test and 7.1
the A3
card is the primary source of drifting. Since the unit is a late model
Agilent unit, that is well beyond the expected range of units described in
Service Note 18. What do you think?
Thanks,
Randy Evans
On Sat, Nov 18, 2017 at 4:47 AM, Illya Tsemenko <il...@xdevs.com> wrote:
>
,
Randy Evans
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is to see
if there is agreement that the A9 board is likely the culprit.
Thanks,
Randy Evans
On Fri, Dec 1, 2017 at 1:58 AM, <acb...@gmx.de> wrote:
> What you describe (A9 drift) would be the explanation. However question is
> how much you see. The A9 should not drift much in the interv
.
Thanks,
Randy Evans
HP-3458A Calibration drift rate 2017-11-17A.xlsx
Description: MS-Excel 2007 spreadsheet
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Frank,
Thanks for the information. I was hoping to hear from someone that had
actually successfully used the DS1220AD in the 3458A. I did not understand
the comment about the "instrument of 'quarks'", but it may be in regards to
the second set of DS1230Y NVRAMs? Did you change those out to
that has actually successfully replaced the DS1220Y with the
DS1220AD, since the DS1220Y is no longer avaialble..
On Fri, Nov 10, 2017 at 5:20 AM, Poul-Henning Kamp <p...@phk.freebsd.dk>
wrote:
>
> In message <CANwu9JbdybQPrSOrQn6xRM0M5YpaL2t40i33+bZMJcDJjO=fqg@mail.
> gm
cuits, as 7V is not used
> directly in the meter, and there are still gain parts to get +12 and
> -12VREF on A3 and 10Vish bipolar levels on A1. If your CAL? 2,1 stays same
> (within 0.3ppm) then A9 is fine.
>
>
> On November 18, 2017 12:59:53 PM GMT+08:00, Randy Evans <
> randye
, 2017 at 12:58 PM, Randy Evans <randyevans2...@gmail.com>
wrote:
> When I try to execute a 10V cal, I get an error code "209 HARDWARE FAILURE
> - - INTERNAL OVERLOAD:31" I suspect that the unit has a different
> security code than 3458. I can't change it without openi
any other
suggestions on how to check the A9 card?
On Sat, Nov 18, 2017 at 11:17 AM, Randy Evans <randyevans2...@gmail.com>
wrote:
> Illya,
>
> That is a great idea. I will give it a try.
>
> Thanks
>
> On Sat, Nov 18, 2017 at 4:47 AM, Illya Tsemenko <il...@xdevs.com&g
ssor does not become active during a power-up cycle
for at least 125ms to ensure
that the NV SRAM is available before the processor attempts a memory access.
Randy Evans
On Fri, Nov 3, 2017 at 2:54 AM, David C. Partridge <
david.partri...@perdrix.co.uk> wrote:
> This gets odder and od
230Y NVRAM, but does still
make the DS1230Y NVRAM, according to their data sheet).
Thanks,
Randy Evans
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I believe that the Fluke shorting system has 3/4" spacing both vertically
and horizontally, which is not compatible with the 3458 (I couldn't find a
spec but visually it looks identically in both dimensions in the photos).
The 3458 spacing is slightly greater than 3/4' horizontally.
On Thu, Nov
to try it. If it works for you, I will
> have Illya update it on xDevs.
>
> Todd
>
> On Sat, Dec 30, 2017 at 12:39 AM, Randy Evans <randyevans2...@gmail.com>
> wrote:
>
> > I am still unable to get my HP-3458A to work with the xdevs program
> > "HP3458A_Me
Samsung Galaxy smartphone
> >> > ---- Original message From: Todd Micallef <
> >> tmical...@gmail.com>
> >> > Date: 12/30/17 6:13 PM (GMT-08:00) To: Discussion of precise voltage
> >> > measurement <volt-nuts@febo.com> Subject: Re: [volt-nuts] GPI
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