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 TEMP? value in degrees Celsius.
Charlie
On 8/17/2014 8:48 PM, Randy Evans wrote:
Can someone explain to me how to read the internal temperature using the
front panel TEMP? command. I have played around but I am doing something
wrong.
thanks,
Randy
On Sun, Aug 17, 2014 at 5:13 PM, Randy Evans <randyevans2...@gmail.com>
wrote:
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 C "CAL
0,3458" "Enter".
See pg. # 64 of the CAL Manual 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 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 time to open
it
up but I will probably have to get some PosiDrive screwdrivers.
Thanks,
Randy
On Sun, Aug 17, 2014 at 11:39 AM, Bill Gold <wpgold3...@att.net> wrote:
Randy:
You are doing a ZERO calibration on the meter rather than a ACAL.
You
have to give it a password after the "0" and then it will do the ZERO
calibration. Usually the password is "3458" and comes from the
factory
that
way. But someone could have changed it in the past. You can do this
from
the front panel menu using the SECURE command. But there is a jumper
inside
the 3458A which disables the request for a password so that you can do
any
CAL or reset the password to what you want. So everything is working
as
expected. The jumper is JM600 on the outguard processor board 66505
or
66515 on the left of the meter inside. Try "3458" first as most are
set
to
this password. Read the Calibration Manual pg. #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: Sunday, August 17, 2014 11:22 AM
Subject: Re: [volt-nuts] RE "new" 3458A
Bill,
I installed the U-short and executed the BLUE-C-0 front panel
command
and
I
get an ERR on the display. I assume this is not good. Did I do
this
correctly?
Thanks,
Randy
On Sun, Aug 17, 2014 at 10:49 AM, Bill Gold <wpgold3...@att.net>
wrote:
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 +000.00002 mVDC. I did the "CAL 0" myself so I would expect
that
the
meter should return to a low value, and it does. I do get a
variation
of
+/- 30 nVDC using 100 PLC and just observing the variations. As I
remember
I have never seen a spec on the ZERO stability over temperature.
If I turn on the MATH function and then do 40 measurements
with
100
PLC
the statistics show:
Low reading -70 nVDC
Mean reading -28 nVDC
High reading +3.5 nVDC
Total Variation 73 nVDC
So that correlates with my visual observation of 60 nVDC.
After
an
hour
the room had gone up around 1 degree C. Then I observed
-000.00023
mVDC.
After another ACAL the reading was again +000.00002 mVDC. This
particular
meter has a negative tempco as the room temp goes up.
Obviously do an ACAL before any precision measurements
requiring
low
nanovolts.
Go to the Keysight website and go to "Technical Support" and
choose
"Parts". Then enter in the "Part Number" "03458-66517" which is
the
replacement "03458-66507" assembly and you will see the
replacement
part
number on the right hand side. Click on that and you will get the
information about the exchange program and so on. Looks like you
can
just
order this part online and pay for it with a credit card, but you
have
to
create or use an existing login account.
I needed a new display a few years ago. At that time you
could
order
just the display for around $80. Being extremely good at removing
and
then
inserting and soldering I ordered the part. The problem was that
the
spacing from top to bottom of the pins had changed. It went from
around
1.3
inches to around 1.5 inches. So I had to bend the pins to fit my
display
board and then get something like 72 pins into the holes on the PC
Board.
It took hours. This change is probably why HP/Agilent/Keysight
doesn't
let
you just get the display anymore but wants you to get the whole PC
Board
assembly. It did work just fine once installed.
Hope this helps your decision to keep or not.
Bill
----- Original Message -----
From: "Randy Evans" <randyevans2...@gmail.com>
To: "Discussion of precise voltage measurement" <
volt-nuts@febo.com>
Sent: Saturday, August 16, 2014 10:36 PM
Subject: Re: [volt-nuts] RE "new" 3458A
Interesting note. After the room cooled down from about 79F to
73F,
and
another ACAL, the meter now reads +000.00035 mVDC, a more
reasonable
value,
although it does bounce around a couple of tenths of a uV.
Maybe that is OK? If so, then the only issue would seem to be
the
display
has some faint pixels, which a new display should fix.
Randy
On Sat, Aug 16, 2014 at 9:59 PM, Randy Evans
<randyevans2...@gmail.com>
wrote:
The unit seems to be working so far except for one issue.
After
doing
an
ACAL, and making sure the Auto Zero is ON, I short the input
leads
with
a
copper wire shunt across the inputs and the reading is
approximately
-000.0023 mVDC. That seems rather high. I would expect the
unit
to
short
the input leads internally and force a zero reading during the
ACAL.
Anyone have any comments on this reading?
Thanks,
Randy
On Sat, Aug 16, 2014 at 3:37 PM, Richard Moore
<richiem5...@gmail.com>
wrote:
Hi Randy -- sounds like your unit is in cal, based on your
measurements
of DCV and precision 10k resistor.
Using autocal all is recommended before doing precision
measurements,
and
I do that if it's been more than a day or two since last use.
The
autocal
uses the internal Vref and an internal 10K resistor to do cal
on
everything
else, so that tells you what the basic cal procedure is. I
just
got
my
3458
back from Loveland, and that's what they did for me -- warmed
it
up,
then
ran autocal, then measured everything against a Fluke 5700,
aided
by
an
HP
3325, and another 3458.
It has been 5 years since I replaced the display board (no
"exchange"
deal was available then AFAIK, so I don't know what's
changed)
and
also
the
NVRAM board, which was dead, with one with the Snap-cap RAM
chips.
I
did
those replacements, then sent it home for cal, which was
complete,
since
all the RAM was new. Now after 5 years, the unit passed all
incoming
performance tests and was sent back to me without a cal
process
of
any
kind. This tells me that an old, well-aged Vref module is a
good
thing.
The
10VDC test had changed by a bit under 5ppm, or roughly
1ppm/year.
They have a cal deal -- use code 1.090 -- press them for it
--
and
that
saved me 30% off the normal price. I think this deal lasts
until
mid-September, so my recent "cal" ended up at just under $400
including
shipping. I'm not sure the deal is available on new or
first-time
cals;
my
unit was in their data bank.
But this is a long way of saying I don't think you need to
send
it
for
cal -- just push Auto Cal and Enter and wait about 10 minutes
and
you
should be good to go.
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