Empathy List Archives

DS

David Smith

Thu, Mar 13, 2014 4:34 PM

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE

I need some help with repairing a Fluke 5100B Calibrator. The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement? Thanks, Dave - W6TE

JP

John Phillips

Thu, Mar 13, 2014 4:54 PM

Try calling 510 651 5112. They were Fluke repair for 5100B, (EECS Fremont
ca)

On Thu, Mar 13, 2014 at 9:34 AM, David Smith w6te@msn.com wrote:

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and
vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no
longer can supply these MOV's. According to the manual's parts list these
varistors are in-house parts by Fluke. I have no way of determining a
substitute part. Is there anyone that can help me identify what could be a
useful replacement?
Thanks,
Dave - W6TE

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.

--
John Phillips

Try calling 510 651 5112. They were Fluke repair for 5100B, (EECS Fremont ca) On Thu, Mar 13, 2014 at 9:34 AM, David Smith <w6te@msn.com> wrote: > I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and > vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no > longer can supply these MOV's. According to the manual's parts list these > varistors are in-house parts by Fluke. I have no way of determining a > substitute part. Is there anyone that can help me identify what could be a > useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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. > -- John Phillips

TK

Tom Knox

Thu, Mar 13, 2014 4:56 PM

Someone will most likely have an exact value, but assuming that RV1 and RV2 are being used as excessive transient voltage protection another way to determine value is to use a variac to power up the 5100B and measure the normal voltages at RV1 and RV2. Then replace with a properly rated MOV.

Thomas Knox

From: w6te@msn.com
To: volt-nuts@febo.com
Date: Thu, 13 Mar 2014 09:34:48 -0700
Subject: [volt-nuts] Fluke 5100B Calibrator‏ Repair Help

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE

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.

Someone will most likely have an exact value, but assuming that RV1 and RV2 are being used as excessive transient voltage protection another way to determine value is to use a variac to power up the 5100B and measure the normal voltages at RV1 and RV2. Then replace with a properly rated MOV. Thomas Knox > From: w6te@msn.com > To: volt-nuts@febo.com > Date: Thu, 13 Mar 2014 09:34:48 -0700 > Subject: [volt-nuts] Fluke 5100B Calibrator‏ Repair Help > > I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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.

TM

Tom Miller

Thu, Mar 13, 2014 5:26 PM

Hi Dave,

It looks like these are just 68 volt GE MOVs.

MFR Code is 09214 - GE
Fluke Part 460394
GE part V68MA3A

It limits the voltage from the guard circuit to chassis ground. The unit
limit is 20 V pp from the front panel.

Should not be too critical.

Regards,
Tom

----- Original Message -----
From: "David Smith" w6te@msn.com
To: volt-nuts@febo.com
Sent: Thursday, March 13, 2014 12:34 PM
Subject: [volt-nuts] Fluke 5100B Calibratorþ Repair Help

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and
vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no
longer can supply these MOV's. According to the manual's parts list these
varistors are in-house parts by Fluke. I have no way of determining a
substitute part. Is there anyone that can help me identify what could be a
useful replacement?
Thanks,
Dave - W6TE

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.

Hi Dave, It looks like these are just 68 volt GE MOVs. MFR Code is 09214 - GE Fluke Part 460394 GE part V68MA3A It limits the voltage from the guard circuit to chassis ground. The unit limit is 20 V pp from the front panel. Should not be too critical. Regards, Tom ----- Original Message ----- From: "David Smith" <w6te@msn.com> To: <volt-nuts@febo.com> Sent: Thursday, March 13, 2014 12:34 PM Subject: [volt-nuts] Fluke 5100B Calibratorþ Repair Help >I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and > vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no > longer can supply these MOV's. According to the manual's parts list these > varistors are in-house parts by Fluke. I have no way of determining a > substitute part. Is there anyone that can help me identify what could be a > useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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.

DS

Dallas Smith

Thu, Mar 13, 2014 5:33 PM

Are they the ones on page 7-12 in the service manual?
http://www.ko4bb.com/manuals/index.php?dir=Fluke

Dallas

On 3/13/2014 12:34 PM, David Smith wrote:

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE

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.

Are they the ones on page 7-12 in the service manual? http://www.ko4bb.com/manuals/index.php?dir=Fluke Dallas On 3/13/2014 12:34 PM, David Smith wrote: > I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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. > >

CS

Charles Steinmetz

Thu, Mar 13, 2014 6:04 PM

Dave wrote:

I need some help with repairing a Fluke 5100B Calibrator. * * *
According to the manual's parts list these varistors are in-house
parts by Fluke.

How hard did you look? According to the 5100B manual on Fluke's web
site (PN 926634, October 1992, Rev.1 1/94), they are GE varistors
V68MA3A (see pp. 5-42, 5-43, and 5-83). That part number appears to
be still available from Littlefuse and probably others.

Best regards,

Charles

Dave wrote: >I need some help with repairing a Fluke 5100B Calibrator. * * * >According to the manual's parts list these varistors are in-house >parts by Fluke. How hard did you look? According to the 5100B manual on Fluke's web site (PN 926634, October 1992, Rev.1 1/94), they are GE varistors V68MA3A (see pp. 5-42, 5-43, and 5-83). That part number appears to be still available from Littlefuse and probably others. Best regards, Charles

DM

David McQuate

Thu, Mar 13, 2014 6:32 PM

Estimate the steady-state maximum current (eg from the unit's normal
mains current) then search Digikey for "inrush current limiters".
Select values near or a little greater than your estimated mains
current in the 6th list-box (select multiple values), titled "Current -
Steady State Max", and click "Apply Filters".

Also make a guess as to the allowable voltage drop across the varistors
in steady state operation. Divide by the estimated current and select a
similar or lower value in the 7th listbox, and again click "Apply
Filters". That should leave you with a managable number of parts to
look thru in the table at the bottom of the web page.

Look at the R at 25C, which will be the major factor in limiting inrush
current. I would tend to choose a varistor with the largest R25, for
minimum inrush current.

(I have no pecuniary interest in Digikey, but I've been a long-term
customer, and I think their search capability is so much better than any
others.)

I hope you find this useful. Feel free to email.

Dave

On 3/13/2014 8:34 AM, David Smith wrote:

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE

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.

--
Clear Stream Technologies

Estimate the steady-state maximum current (eg from the unit's normal mains current) then search Digikey for "inrush current limiters". Select values near or a little greater than your estimated mains current in the 6th list-box (select multiple values), titled "Current - Steady State Max", and click "Apply Filters". Also make a guess as to the allowable voltage drop across the varistors in steady state operation. Divide by the estimated current and select a similar or lower value in the 7th listbox, and again click "Apply Filters". That should leave you with a managable number of parts to look thru in the table at the bottom of the web page. Look at the R at 25C, which will be the major factor in limiting inrush current. I would tend to choose a varistor with the largest R25, for minimum inrush current. (I have no pecuniary interest in Digikey, but I've been a long-term customer, and I think their search capability is so much better than any others.) I hope you find this useful. Feel free to email. Dave On 3/13/2014 8:34 AM, David Smith wrote: > I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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. > > -- Clear Stream Technologies

DM

David McQuate

Thu, Mar 13, 2014 6:41 PM

Question: are the vaporized parts varistors (usually put in series for
inrush current limiting) or MOVs (placed in shunt to limit transient
peak voltages)? My comments concerned the former...
Dave

On 3/13/2014 8:34 AM, David Smith wrote:

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE

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.

--
Clear Stream Technologies

Question: are the vaporized parts varistors (usually put in series for inrush current limiting) or MOVs (placed in shunt to limit transient peak voltages)? My comments concerned the former... Dave On 3/13/2014 8:34 AM, David Smith wrote: > I need some help with repairing a Fluke 5100B Calibrator. > The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement? > Thanks, > Dave - W6TE > _______________________________________________ > 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. > > -- Clear Stream Technologies

TM

Tom Miller

Thu, Mar 13, 2014 7:17 PM

They are MOVs. They protect the Guard circuit to chassis and outguard DC
supply.

Tom

----- Original Message -----
From: "David McQuate" mcquate@sonic.net
To: volt-nuts@febo.com
Sent: Thursday, March 13, 2014 2:41 PM
Subject: Re: [volt-nuts] Fluke 5100B Calibratorâ€ Repair Help

Question: are the vaporized parts varistors (usually put in series for
inrush current limiting) or MOVs (placed in shunt to limit transient peak
voltages)? My comments concerned the former...
Dave

On 3/13/2014 8:34 AM, David Smith wrote:

I need some help with repairing a Fluke 5100B Calibrator.
The capacitor support bracket fell into the power supply module and
vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no
longer can supply these MOV's. According to the manual's parts list these
varistors are in-house parts by Fluke. I have no way of determining a
substitute part. Is there anyone that can help me identify what could be
a useful replacement?
Thanks,
Dave - W6TE _______________________________________________
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.

--
Clear Stream Technologies

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.

They are MOVs. They protect the Guard circuit to chassis and outguard DC supply. Tom ----- Original Message ----- From: "David McQuate" <mcquate@sonic.net> To: <volt-nuts@febo.com> Sent: Thursday, March 13, 2014 2:41 PM Subject: Re: [volt-nuts] Fluke 5100B Calibratorâ€ Repair Help > Question: are the vaporized parts varistors (usually put in series for > inrush current limiting) or MOVs (placed in shunt to limit transient peak > voltages)? My comments concerned the former... > Dave > > On 3/13/2014 8:34 AM, David Smith wrote: >> I need some help with repairing a Fluke 5100B Calibrator. >> The capacitor support bracket fell into the power supply module and >> vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no >> longer can supply these MOV's. According to the manual's parts list these >> varistors are in-house parts by Fluke. I have no way of determining a >> substitute part. Is there anyone that can help me identify what could be >> a useful replacement? >> Thanks, >> Dave - W6TE _______________________________________________ >> 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. >> >> > > -- > Clear Stream Technologies > > _______________________________________________ > 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.

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Fluke 5100B Calibrator‏ Repair Help