Author Topic: Bunch of keysight U1252B meters around  (Read 102214 times)

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Offline unimorpheus

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Re: Bunch of keysight U1252B meters around
« Reply #225 on: February 22, 2017, 09:13:31 pm »
Why not this manual that appears to be a bit more up to date.

http://literature.cdn.keysight.com/litweb/pdf/U1251-90036.pdf?id=1820177
 

Offline bitseeker

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Re: Bunch of keysight U1252B meters around
« Reply #226 on: February 22, 2017, 09:51:44 pm »
Thanks, unimorpheus. The newest edition I had was 19. I didn't know it was up to 20, now.
I TEA.
 

Offline timelessbeing

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Re: Bunch of keysight U1252B meters around
« Reply #227 on: February 23, 2017, 01:01:53 am »
I paid on 13-Feb.
Seller says he put it in the mail 15-Feb.
Estimated delivery was 21-Feb
Now, 22-Feb end of day, USPS website still says "USPS Awaiting Item"
 :-//
 

Offline ocw

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Re: Bunch of keysight U1252B meters around
« Reply #228 on: February 23, 2017, 02:27:02 pm »
I purchased two of the U1252B meters.  The first was purchased relatively early in the offering from Centerview, Missouri while the second one was purchased about two weeks ago.  The first meter received had a Keysight logo and had a calibration date of 05-Feb-2015.  The second meter came with an Agilent logo and had a calibration date of 08-Apr-2014.  The first meter appeared to be in an untouched box and came with the nice U1174A case.  The second meter came in what looked like a scavenged box.  The case and most of the packing material inside was missing.  Both meters came with a still sealed battery and with its meter face protection still in place.

I like to give my new meters "proof of performance" accuracy testing.  The results of that are attached.

For voltage accuracy I have a variety of voltage references.  With those being just simple home-made projects, the accuracy of my Agilent 34401A is better.  I used the 34401A to first confirm that the accuracy of the references are within their specifications and then I use the 34401A's reading as the voltage calibration standard to rate the U1252B's.  With the voltage standard's IC always being listed, the data can also be used to compare a variety of voltage references.

For resistance accuracy I used a fair number of mostly 0.01% resistors as references.

For current measurement I prefer to make the measurements with my most frequent circumstances when I measure current.  That's when I am NOT measuring a constant current source.  The added series resistance of a meter for current measurement can cause problems with the circuit that I'm trying to measure.  Sure, there are ways around that, but given a choice I'd prefer a meter which has me playing those games as little as possible.  So, my accuracy measurements are to a current determined by a precisely measured voltage and a precision (typically 0.01%) resistor.  I then rate the accuracy of the measurement two ways.  First, it's simply to the V/R current without considering the meter insertion resistance.  Then I add the effect of that resistance to that accuracy calculation for a different accuracy figure.  That second figure should match the manufacturer's specifications.  For higher currents the two accuracies can be very different.  For currents around 200 mA the U1252B's corrected accuracy was often around 0.1% while the uncorrected accuracy was over 17%.  Its spec sheet accuracy for that current is 0.2%.

I typically mark the shunt resistance of meters on them.  It's a good reminder of the meter's limitations.  Listing those two or three fixed values is more useful for me than trying to indicate the infinite number of actual burden voltages.

I used a similar technique for AC current accuracy measurement.  I have a OPA548 following my function generator to provide up to 2 amps RMS AC output.  The power line voltage here doesn't have enough stability to be suitable for use for meter accuracy verification.

At the end my report I show a picture of a recent test which I made using one of the U1252B's for a stability check of one of my current to voltage converters which I built.  It shows the stability of a 3.6 pA reading.  That was produced for testing by using a 3.6 volt battery and a 1T ohm resistor.  While the noise level negates the value of it, it's still nice to have 1 aA current resolution on the U1252B, improving to 0.1 aA with the 34401A.  I have managed the power line noise and am learning to deal with the op amp, Johnson, and cosmic ray noise.  The pictured current was using a converter having an ADA4530-1 op amp.  I have a second converter using an AD8067 for low current RF measurement.  More on the converters perhaps later.
 
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Offline timelessbeing

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Re: Bunch of keysight U1252B meters around
« Reply #229 on: February 25, 2017, 05:06:45 am »
I paid on 13-Feb.
Seller says he put it in the mail 15-Feb.
Estimated delivery was 21-Feb
Now, 22-Feb end of day, USPS website still says "USPS Awaiting Item"
 :-//

Mine got returned to sender for some damn reason.
Gotta wait another week.
:rant:
 

Offline RGK

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Re: Bunch of keysight U1252B meters around
« Reply #230 on: February 25, 2017, 06:21:57 am »
I paid on 13-Feb.
Seller says he put it in the mail 15-Feb.
Estimated delivery was 21-Feb
Now, 22-Feb end of day, USPS website still says "USPS Awaiting Item"
 :-//

Mine got returned to sender for some damn reason.
Gotta wait another week.
:rant:

Yep, several of us in the same position today it seems.  Hoping for a smoother second trip!

BK
 

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #231 on: February 25, 2017, 01:04:35 pm »
Hmmm, what are the chances that 2 parcels from the same sender both get returned to sender?  I suspect that they were never given to USPS, I bugged the sender a couple of times before mine got sent.
I'd like to make the world a better place but they won't give me the source code
 

Offline kado

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Re: Bunch of keysight U1252B meters around
« Reply #232 on: February 25, 2017, 02:19:57 pm »
My actual shipping status:

Übersicht
Shipped from the Global Shipping Center to International Destination
Erlanger Kentucky 41025-2501 Thu Feb 23 13:34:00 GMT-07:00 2017
Customs Documentation and Labeling

Erlanger Kentucky 41025-2501 Wed Feb 22 13:51:00 GMT-07:00 2017
Delay at Global Shipping Center - Special Handling Review

Erlanger Kentucky 41025-2501 Tue Feb 21 01:58:00 GMT-07:00 2017
Processing at Global Shipping Center

Erlanger Kentucky 41025-2501 Mon Feb 20 19:24:00 GMT-07:00 2017
Arrived at Global Shipping Center

ERLANGER KY 41025 Sun Feb 19 07:20:00 GMT-07:00 2017
In Transit-Arrived at USPS Facility

CINCINNATI OH 45234 Sat Feb 18 22:12:00 GMT-07:00 2017
In Transit-Departed USPS Facility

CINCINNATI OH 45235 Sat Feb 18 13:11:00 GMT-07:00 2017
In Transit-Arrived at Post Office

CINCINNATI OH 45235 Sat Feb 18 12:26:00 GMT-07:00 2017
In Transit-Arrived at USPS Destination Facility

CINCINNATI OH 45235 Fri Feb 17 20:35:00 GMT-07:00 2017
In Transit-Departed USPS Facility

KANSAS CITY KS 66106 Thu Feb 16 23:44:00 GMT-07:00 2017
In Transit-Arrived at USPS Origin Facility

KANSAS CITY KS 66106 Thu Feb 16 21:11:00 GMT-07:00 2017
In Transit-Departed Post Office

WARRENSBURG MO 64093 Thu Feb 16 16:33:00 GMT-07:00 2017
In Transit-Acceptance

WARRENSBURG MO 64093 Thu Feb 16 12:41:00 GMT-07:00 2017

What means *Delay at Global Shipping Center - Special Handling Review* ???
Fault declaration or poor packing?

Karsten

 

Offline sdouble

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Re: Bunch of keysight U1252B meters around
« Reply #233 on: February 25, 2017, 07:55:34 pm »
I bought 4 units. Took 4 days to ship and 1 week to get to france.
Packaging was not new (partially damaged for all 4). Agilent brand. Calibration date : october 2012.
 

Offline MechEng2015

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Re: Bunch of keysight U1252B meters around
« Reply #234 on: February 25, 2017, 08:29:06 pm »
Bought and paid for one on 2/17.
Seller claimed it shipped 2/22.
Tracking (USPS) as of 2/25 shows label created on 2/18 but item not yet received.
Seller says there were about 10 shipments not scanned and has opened an inquiry.

 

Offline RGK

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Re: Bunch of keysight U1252B meters around
« Reply #235 on: February 25, 2017, 10:35:06 pm »
Bought and paid for one on 2/17.
Seller claimed it shipped 2/22.
Tracking (USPS) as of 2/25 shows label created on 2/18 but item not yet received.
Seller says there were about 10 shipments not scanned and has opened an inquiry.

Some not scanned and some returned to sender.  We can only speculate, but smells like improper packaging/labeling/postage on the recent crop.  Hoping that the re-shipments promised for today go as planned and per USPS Priority Mail requirements!

BK
 

Offline Lbud4

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Re: Bunch of keysight U1252B meters around
« Reply #236 on: February 26, 2017, 12:13:44 am »
I received my first meter just fine. Waiting on the second now. Unfortunately, USPS sucks. It might not be the seller. He has been very responsive to me.


Sent from my iPad using Tapatalk Pro
 

Offline shteii01

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Re: Bunch of keysight U1252B meters around
« Reply #237 on: February 26, 2017, 03:21:47 am »
How to find which firmware I have?
 

Offline natman69

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Re: Bunch of keysight U1252B meters around
« Reply #238 on: February 26, 2017, 09:07:04 am »
I think the only way to get the firmware version is using a data cable and the Keysight data logger software.
My DMM (built feb-2014) has firmware v2.18.
I haven't found a newer firmware on Keysight web site.
 

Offline grumpydoc

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Re: Bunch of keysight U1252B meters around
« Reply #239 on: February 26, 2017, 12:25:33 pm »
Bought and paid for one on 2/17.
Seller claimed it shipped 2/22.
Tracking (USPS) as of 2/25 shows label created on 2/18 but item not yet received.
Seller says there were about 10 shipments not scanned and has opened an inquiry.

Some not scanned and some returned to sender.  We can only speculate, but smells like improper packaging/labeling/postage on the recent crop.  Hoping that the re-shipments promised for today go as planned and per USPS Priority Mail requirements!

BK
Same story here.

Given the fact that the seller has been fairly responsive and, especially, that a 2nd attempt has now reached the Global Shipping hub I am prepared to give him the benefit of the doubt.

Hopefully this one will make it all the way to the UK without being mangled. Not that the GSP has the best of reputations for safe shipping.
 

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #240 on: February 26, 2017, 01:03:19 pm »
Sorry to hear about you guys' meters not making it :(  Mine is sitting at my neighbor's house (they sent me a picture) so I should catch up with it later today.  My U1117A Class 1 Bluetooth - IR link is also should be there.  Hope I got a good meter.
I'd like to make the world a better place but they won't give me the source code
 

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #241 on: February 26, 2017, 01:08:35 pm »
What means *Delay at Global Shipping Center - Special Handling Review* ???
Fault declaration or poor packing?

Karsten
It's probably that the customs guys have looked at the parcel scan and are trying to figure out what it is so they can charge you some taxes.  I can't even send my granddaughter in the UK clothes without the pedantic customs guys writing to the recipient saying they owe VAT - even when it's genuinely marked as an unsolicited gift.
I'd like to make the world a better place but they won't give me the source code
 

Offline BravoV

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Re: Bunch of keysight U1252B meters around
« Reply #242 on: February 26, 2017, 02:00:01 pm »
Sorry to hear about you guys' meters not making it :(  Mine is sitting at my neighbor's house (they sent me a picture) so I should catch up with it later today.  My U1117A Class 1 Bluetooth - IR link is also should be there.  Hope I got a good meter.

You won't regret that U1117A purchase, coupled with U1252B, it will be a very handy and quite powerful remote measurement & logging tool, I used it a lot.  :-+

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #243 on: February 26, 2017, 05:08:13 pm »
Yes, the more I thought about it, the more the idea of having a remote reading capability appealed to me, especially on my iPhone and I can connect to Bluetooth on my big dual monitor PC.
I'd like to make the world a better place but they won't give me the source code
 

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #244 on: February 27, 2017, 12:35:26 am »
Well I made it home safely and was united with my new meter.  It is 'Agilent' branded with a Cal date of Apr 10th, 2014.  It came in an Agilent U1252B box and includes the weird skins, a shrink-wrapped Powerex 250 mAh NimH battery that seems to be fully charged, the Cal certificate, the charger setup, and a nice set of Agilent U1166A test leads that include probes and croc clips.  It seems to be unmarked / flawless and a first power up indicates that it's working well.  I included a pic for y'all.
I'd like to make the world a better place but they won't give me the source code
 

Offline noidea

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Re: Bunch of keysight U1252B meters around
« Reply #245 on: February 27, 2017, 02:21:53 am »
My U1252B arrived today. It was calibrated in april 2014.
It has a label "Peerless Electronic Supplies, Louisville KY" on the box.
It's clear and unused.
I've registered it on Keysight web portal and it has only a month of residual warranty.

Mine came through the same supply path but cal date is April 15 so hopefully has a little more warranty left  :-+

Packaging for international transport was pretty ordinary, the meter was floating around in a plastic bag with the other bits and pieces in the Keysight box which had then been placed into
a USPS shoebox. I would have thought the Keysight packaging would have at least had some bubblewrap covering the meter.  :--
 

Offline Gandalf_Sr

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Re: Bunch of keysight U1252B meters around
« Reply #246 on: February 27, 2017, 11:42:11 am »
@Noidea My meter was packed exactly as you described, the USPS box was actually 6 inches longer than the Agilent box inside and there was zero packing so the Agilent box could slide up and down inside the USPS box, a piece of crushed newspaper each end would have helped!  Inside the Agilent box, the meter was in a thin plastic bag rattling around with all the other stuff; I agree that, for a $400+ (list) product, you'd think they would at least have put the meter in a bubble-wrap bag.

Anyway, mine survived the journey unscathed.  I set up and tested the U1117A this morning, it came with Energizer lithium AAA batteries (classy) and works well :)
I'd like to make the world a better place but they won't give me the source code
 

Offline K5HJ

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Re: Bunch of keysight U1252B meters around
« Reply #247 on: February 27, 2017, 08:14:50 pm »
Power on with the Null button pressed to see firmware version.
 
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Online BU508A

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Re: Bunch of keysight U1252B meters around
« Reply #248 on: February 27, 2017, 09:53:18 pm »
Seven minutes after I received the "you have bought the U1252B meter" confirmation email from ebay it was marked as "item sent".

That was pretty quick.  :o  *wow*   Red Flash, is that you?  ;D

So, let's see how long it'll take to arrive here in Germany.
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline Luap2

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Re: Bunch of keysight U1252B meters around
« Reply #249 on: February 28, 2017, 01:40:25 am »
Now that I see how to get the firmware Version up,  217 is what a meter with a calb cert due on Oct 2013 has for firmware.
Some one with a much more resent Cal date care to post there  firmware version . Also anyone know if there is page on the website
(Keysight) giving the changes with each version
 


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