Re: [volt-nuts] fluke 731b battery pack

If even with a fully charged pack the batt charge side gets high enough to feed into the ref you need to check the current value of the current limiting resistor in the charge circuit. Don't have the exact details in my head at the moment (was about 3 years ago) but in both of my 731Bs that

[volt-nuts] fluke 731b battery pack

Most NiMH cells have a capacity of around twice what a NiCad has, so a NiCad charger that works at a C/10 charge rate will be charging NiMH cells at C/20. That can be an acceptable trickle rate for NiMH cells, but I prefer something in the C/40 neighborhood. I put some in an electric shaver

Re: [volt-nuts] fluke 731b battery pack

. There is a minimum Wh capacity allowed but I am not sure what it is. Not much from memory. - Original Message - From: "David" <davidwh...@gmail.com> To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> Sent: Wednesday, August 03, 2016

Re: [volt-nuts] fluke 731b battery pack

On Wed, 3 Aug 2016 14:30:33 -0700, you wrote: >On Wed, Aug 3, 2016 at 2:08 PM, David wrote: > >> >> I looked at the schematic and is seems feasible without excessive >> effort. Either the existing simple series preregulator can be >> modified or replaced allowing it to

Re: [volt-nuts] fluke 731b battery pack

On Wed, Aug 3, 2016 at 2:08 PM, David wrote: > > I looked at the schematic and is seems feasible without excessive > effort. Either the existing simple series preregulator can be > modified or replaced allowing it to both charge the battery (through a > blocking diode) and

Re: [volt-nuts] fluke 731b battery pack

Does that restriction apply to batteries which are integrated with a device? I thought it only applied to separate cells. On Wed, 03 Aug 2016 17:20:00 -0400, you wrote: >I like the LiFe idea except for the restrictions on shipping by air or USPS. > >That shouldn't be too much of a problem for

Re: [volt-nuts] fluke 731b battery pack

asurement" <volt-nuts@febo.com> Sent: Wednesday, August 03, 2016 5:08 PM Subject: Re: [volt-nuts] fluke 731b battery pack On Wed, 3 Aug 2016 16:34:31 -0400, you wrote: Eric wrote: NiMH cells seem to work in the 731b so I'd prefer to use them over NiCd because of the higher capacity

Re: [volt-nuts] fluke 731b battery pack

The battery in the 731B is charged via a diode and 510 ohm resistor from the rectified DC, before the smoothing capacitor. The smoothing capacitor and power supply is fed by another diode, so the battery is charged with a pulse waveform. If you have no battery, then this pulse charge waveform

Re: [volt-nuts] fluke 731b battery pack

On Wed, 3 Aug 2016 16:34:31 -0400, you wrote: >Eric wrote: > >> NiMH cells seem to work in the 731b so I'd prefer to use them over NiCd >> because of the higher capacity and lower toxicity of potential leaks. Is >> there a downside to doing this? > >In my experience, good NiCDs are preferable to

Re: [volt-nuts] fluke 731b battery pack

Sent: Wednesday, August 03, 2016 1:27 PM Subject: [volt-nuts] fluke 731b battery pack So I managed to get one of the Fluke 731b's mentioned on the list a while back. It was a little more chewed up than the description in the auction led me to believe: https://plus.google.com/u/0/11287121957

Re: [volt-nuts] fluke 731b battery pack

Are the low discharge NiMH cells available now any more rugged than regular NiCd cells as far as charging current? One solution I would consider is using LiFePO4 cells and modifying the charger for current limited constant voltage. On Wed, 03 Aug 2016 19:37:12 +, you wrote: > >In

Re: [volt-nuts] fluke 731b battery pack

ge measurement" <volt-nuts@febo.com> Sent: Wednesday, August 03, 2016 10:27 AM Subject: [volt-nuts] fluke 731b battery pack > So I managed to get one of the Fluke 731b's mentioned on the list a while > back. It was a little more chewed up than the description in the

[volt-nuts] fluke 731b battery pack

So I managed to get one of the Fluke 731b's mentioned on the list a while back. It was a little more chewed up than the description in the auction led me to believe: https://plus.google.com/u/0/112871219575380932919/posts/iDWyzwYYRdj?pid=6314634305601690930=112871219575380932919 but it appears

[volt-nuts] Fluke 731b Rack Mounting

Hello All, I just picked up a 731b that I would like to mount in a rack with a back up UPS. I know that Fluke made the "Rack Mounting Kit M03-205-605" These were used to house up to four of these standards in the space of 3U, I think. The present day version of this is the Fluke 734a-7001.

Re: [volt-nuts] Fluke 731B

: [volt-nuts] Fluke 731B Richard, Some really good information has already been posted. Here is what I have found. I posted a comparison of the 731B against the Geller Labs SVR-T here: http://www.eevblog.com/forum/testgear/geller-labs-svr-and-svr-t/msg282582/#msg282582 There were within

Re: [volt-nuts] Fluke 731B

:41 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Fluke 731B I would never adjust any pots on a working fluke voltage standard. When the pot moves you introduce more drift. Just keep track of differences. By the same token I do not turn off my 3458As as long as the line

Re: [volt-nuts] Fluke 731B

-nuts] Fluke 731B Richard, Some really good information has already been posted. Here is what I have found. I posted a comparison of the 731B against the Geller Labs SVR-T here: http://www.eevblog.com/forum/testgear/geller-labs-svr-and-svr-t/msg282582/#msg282582 There were within 1ppm of each

Re: [volt-nuts] Fluke 731B

Richard, Some really good information has already been posted. Here is what I have found. I posted a comparison of the 731B against the Geller Labs SVR-T here: http://www.eevblog.com/forum/testgear/geller-labs-svr-and-svr-t/msg282582/#msg282582 There were within 1ppm of each other over 48

[volt-nuts] Fluke 731B power switch replacement: TE Connectivity / Alcoswitch MTL206N

Original was MSTL206N, count not cross-ref the maker. TE MTL206N is an exact match drop-in, same locking toggle with same shape/size everything. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to

Re: [volt-nuts] Fluke 731B parts xref

Hi Fred, Well, it seems to me that the only time the relay is an issue is if the coarse adjust pot is not fully clockwise. If you look at the schematic, the relay is bypassed with R101 (coarse) is in the full CW position (a detented switch position) actuating S101. Near as I can tell, the

Re: [volt-nuts] Fluke 731B parts xref

On 11/21/12 6:44 PM, WB6BNQ wrote: Hi Chris, Do you mean the Fluke 750A ? It has connections for standard cells. The 752 is a ratio device designed to be used with a 10 volt reference standard. No need for the 1.xx outputs from the 731B or the use of standard cells.. Your are

Re: [volt-nuts] Fluke 731B parts xref

Hi Chris, If you study the schematic you will see that S3, the front panel lock-open-momentary switch, is in series between the standard cell (J10) and the null meter (J8). So what is happening is the voltage from the 750A goes to one side of the null meter and the reference (Standard Cell)