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. >> > > > > > >> _______________________________________________ >> > > > > > >> volt-nuts mailing list -- volt-nuts@febo.com >> > > > > > >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> > > > > > >> mailman/listinfo/volt-nuts >> > > > > > >> and follow the instructions there. >> > > > > > >> >> > > > > > > >> > > > > > > >> > > > > > _______________________________________________ >> > > > > > volt-nuts mailing list -- volt-nuts@febo.com >> > > > > > To unsubscribe, go to >> > > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> > > > > > and follow the instructions there. >> > > > > >> > > > > _______________________________________________ >> > > > > volt-nuts mailing list -- volt-nuts@febo.com >> > > > > To unsubscribe, go to >> > > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> > > > > and follow the instructions there. >> > > > > >> > > > _______________________________________________ >> > > > volt-nuts mailing list -- volt-nuts@febo.com >> > > > To unsubscribe, go to >> > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> > > > and follow the instructions there. >> > > >> > > _______________________________________________ >> > > volt-nuts mailing list -- volt-nuts@febo.com >> > > To unsubscribe, go to >> > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> > > and follow the instructions there. >> > > >> > _______________________________________________ >> > volt-nuts mailing list -- volt-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> > and follow the instructions there. >> >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. >> > > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
