[volt-nuts] volt-nuts Digest, Vol 59, Issue 13 4214 help needed

Fri Jul 11 16:11:35 EDT 2014

Thank you, Mitch for the Rubicon data!!!!!
Willy

On 7/11/2014 7:32 AM, volt-nuts-request at febo.com wrote:
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> Today's Topics:
>
>     1. Re: AC Voltage Measurement Standards (Todd Micallef)
>     2. Fluke 5200A repair. (Kgoodhew)
>     3. Need info on L&N 4214 temp vs resistance plot.. (new)
>     4. Re: Need info on L&N 4214 temp vs resistance plot..
>        (Mitch Van Ochten)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 10 Jul 2014 22:42:37 -0400
> From: Todd Micallef <tmicallef at gmail.com>
> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
> Subject: Re: [volt-nuts] AC Voltage Measurement Standards
> Message-ID:
> 	<CALwLtXwYwdsD-y1tGXxSh+00jNTFEr+LiEfrfCTTuuLeGspM=Q at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> The remark about calibrating the resistors was merely an example of how I
> thought you may have been transferring the calibration of the 10V TVC. My
> first thought was that you compared the 10V TVC to the next closest model
> at fixed points. The inter-comparison would then continue from that model
> to the next value down (or up).
> I had a hard time trying to understand how that could be accurate, and the
> thought of using a ratio transformer didn't cross my mind. Thanks for the
> explanation.
>
> I can see how the costs of calibrating a TVC can be so high. I am guessing
> few labs possess the equipment to calibrate them and places like Ballantine
> probably use NIST for their cals.
>
> Todd
>
>
>
>
>
>> as far as your comment re. calibrating a set of resistor cal from one
>> calibrated one, whats wrong with it? if you do that with a stable voltage
>> and by voltage divider measurement using the linearity of the 3458A, you
>> end up with pretty decent accuracies. I cannot comment on the 242, just did
>> some quick checks some time ago and my quick assessment then was it is
>> worse/not better than the 3458a method.
>>
>>
>>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 11 Jul 2014 14:27:54 +1000
> From: "Kgoodhew" <kgoodhew at iinet.net.au>
> To: <volt-nuts at febo.com>
> Subject: [volt-nuts] Fluke 5200A repair.
> Message-ID: <004c01cf9cc0$7c9ea7a0$75dbf6e0$@iinet.net.au>
> Content-Type: text/plain;	charset="us-ascii"
>
> Hi Gerd,
>   C8 is on the drain of Q38 the Fet just near the input to the A7 amplifier,
> according to Charles it is switched in parallel with C1 on the source of Q38
> to vary the integration time.
> Using the cro on dc to look at the output I get 15mv dc on the output and I
> cannot vary it by R6.
> Will do some further checking today.
> Ken.
>
>
>
>
>
> Message: 5
> Date: Fri, 11 Jul 2014 12:38:05 +1000
> From: Gerd <admin at controlelectronics.com.au>
> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
> Subject: [volt-nuts]  fluke 5200a repair
> Message-ID: <53BF4E0D.9030808 at controlelectronics.com.au>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hello Ken,
>
> Which board are you looking at? On the amplifier board (A7) C24 is the
> input cap. Where is C8?
> Don't rely on the multimeter to filter out the AC on the DC ranges, it's
> best to use a CRO. How is the signal coming into the amplifier from the
> oscillator? If the input to the amplifier is disconnected, is the offset
> still there?
>
>
>
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> ------------------------------
>
> Message: 3
> Date: Fri, 11 Jul 2014 00:35:34 -0400
> From: new <pitts7 at williams-net.com>
> To: volt-nuts at febo.com
> Subject: [volt-nuts] Need info on L&N 4214 temp vs resistance plot..
> Message-ID: <53BF6996.9040906 at williams-net.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I'm guessing that the 4214 10K standard has a resistance curve
> that peaks around 73F??? I've searched for old pix of data and can't find
> any. The 4214 I got this week had no old, original data with it in its box.
>
> Over the past few years there have been some resistance standards
> sold on fleabay with pictures of temp vs. resistor value charts pasted
> on the top cover.  They may not have been 4214s, though. I also just
> discovered that fleabay drops its pix on items sold past a certain date.
>
> So, volt-nuts.... any help??? Alphas, Betas, charts?
>
> Willy
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 11 Jul 2014 07:25:59 -0400
> From: "Mitch Van Ochten" <mitch at vincentelectronics.com>
> To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
> Subject: Re: [volt-nuts] Need info on L&N 4214 temp vs resistance
> 	plot..
> Message-ID: <00d401cf9cfa$e441fa80$acc5ef80$@vincentelectronics.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Willy,
>
> For what it's worth I have attached the resistance vs. temperature curve for
> my 10 k Rubicon which is of similar construction. It has a peak at about
> 23.5 degrees C.
>
>
> Best regards,
>
> mitch
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
> Behalf Of new
> Sent: Friday, July 11, 2014 12:36 AM
> To: volt-nuts at febo.com
> Subject: [volt-nuts] Need info on L&N 4214 temp vs resistance plot..
>
> I'm guessing that the 4214 10K standard has a resistance curve that peaks
> around 73F??? I've searched for old pix of data and can't find any. The 4214
> I got this week had no old, original data with it in its box.
>
> Over the past few years there have been some resistance standards sold on
> fleabay with pictures of temp vs. resistor value charts pasted on the top
> cover.  They may not have been 4214s, though. I also just discovered that
> fleabay drops its pix on items sold past a certain date.
>
> So, volt-nuts.... any help??? Alphas, Betas, charts?
>
> Willy
>
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> End of volt-nuts Digest, Vol 59, Issue 13
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