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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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12th Jul 2021, 11:14 am | #1 |
Diode
Join Date: Jul 2021
Location: Gold Coast, Queensland, Australia.
Posts: 5
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Wayne-Kerr B641 Automatic Balance
Hi,
I have such a balance, but no manual. By trawling around, comparing some other WK balances and referring to https://www.vintage-radio.net/forum/...d.php?t=133081 I have been able to work out how to make some basic measurements. My bridge seems to be working OK. The instruction I have compiled are below. Can anyone comment or correct them or better yet, provide a manual? 1. All buttons to 0 2. Switch C < 10 uF 3. +/- switch to + 4. Vernier knobpots to 0 5. Disconnect unknown and cables from E and I 6. Range to 1 7. Mains switch to Supply. Observe 8 to 9 on G meter. 8. Mains switch to Cal. 9. Trim C for 0 on top C meter 10. Trim G for 0 on bottom G meter 11. G lower row button 1 12. Adjust FSD for 10 on G meter. 13. Adjust Zero for 0 on C meter 14. Button back to 0 16. Switch to Operate 17. Connect unknown to E and I by coax cables: For simple 2 lead components, connect outers of E and I together. Connect unknown between the inners. For example unknown resistor: 18. Press Range 1, 2 in sequence until get a reading between 1 and 10 on desired C or G meter. 19. Press lower row button corresponding to the integer part of the meter reading. 20. Press next higher Range button. Observe integer part of new meter reading. 21. Press top row button corresponding to previous lower row button. 22. Press lower row button according to new integer part observed in 20. Now have first 2 digits of reading on the buttons and nixies. 23. Press next higher range button. 24. Meter now shows next 2 digits, which can be zeroed out for an accurate reading with the knobpots. 25. Multiply figure shown on nixes, plus 2 additional digits from meter (or knobpots) by the units indicated by the Range button. That is the result. |
12th Jul 2021, 8:21 pm | #2 |
Hexode
Join Date: Jul 2008
Location: Gateshead, Tyne & Wear, UK.
Posts: 336
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Re: Wayne-Kerr B641 Automatic Balance
Hello Mike
I have just found my copy of the Operating Instructions for the Wayne Kerr B641 Auto Balance Universal Bridge. If you can give me a day or so, it will need cleaning up, I will scan the instructions and convert to a PDF file and post a copy on the forum for you. If the file turns out to be too big for the forum it may be necessary to send the file by email. Regards Stan.
__________________
Junk accumulates to fill the space available. |
15th Jul 2021, 4:19 am | #3 |
Diode
Join Date: Jul 2021
Location: Gold Coast, Queensland, Australia.
Posts: 5
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Re: Wayne-Kerr B641 Automatic Balance
Thanks Stan, that would be fantastic. Ill PM my email address.
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15th Jul 2021, 9:24 am | #4 |
Hexode
Join Date: Jul 2008
Location: Gateshead, Tyne & Wear, UK.
Posts: 336
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Re: Wayne-Kerr B641 Automatic Balance
Hello Mike
Please find attached a PDF copy of the "Operating Instructions" for the Wayne Kerr B641 Auto Balance Universal Bridge. The original copy was an A5 size document, but I have increased the size to fit a standard A4 sheet, approximately 140% bigger, it also helps me read it. I hope you will find it useful. Regards Stan.
__________________
Junk accumulates to fill the space available. |
15th Jul 2021, 10:21 am | #5 |
Diode
Join Date: Jul 2021
Location: Gold Coast, Queensland, Australia.
Posts: 5
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Re: Wayne-Kerr B641 Automatic Balance
Wow. Very generous and thoughtful. Thanks Stan!
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15th Jul 2021, 11:58 am | #6 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Wayne-Kerr B641 Automatic Balance
That's useful, thanks!
I have a B641 in the attic. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
16th Jul 2021, 5:26 am | #7 |
Diode
Join Date: Jul 2021
Location: Gold Coast, Queensland, Australia.
Posts: 5
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Re: Wayne-Kerr B641 Automatic Balance
After reading the manual, courtesy of Stan, I have updated my simple procedure for the future reference of others:
The bridge has two sections, measuring impedance at 90 degree phase shift. C measures capacitance/inductance while G measures conductance. Basic operating instructions based on manual: 0. Connect coax cables with alligator clips to E and I. Connect outers together. Inners unconnected. 1. All buttons to 0 2. Switch C < 10 uF 3. +/- switch to + 4. Vernier knobpots to 0 5. Disconnect unknown from E and I 6. Range to 1 7. Operate switch to Supply. Observe >= 7 on G meter. 8. Operate switch to Cal. 9. Trim C for 0 on top C meter 10. Trim G for 0 on bottom G meter 11. G lower row button 1 12. Adjust FSD for 10 on G meter. 13. Adjust Zero for 0 on C meter 14. All buttons back to RED 15. Operate switch to Operate 16. Connect unknown to E and I by coax cables: For simple 2 lead components, connect outers of E and I together. Connect unknown between the inners. For example unknown capacitor or resistor: 17. Press Range 1, 2 in sequence until get a reading between 1 and 10 on desired C or G meter. 18. Press upper row button corresponding to the integer part of the meter reading. 19. Press lower row button according to new integer part observed on the meter. Now have first 2 digits of reading on the buttons and nixies. 20. Meter now shows next 2 digits, which can be zeroed out for an accurate reading with the knobpots. 21. Multiply figure shown on nixes/buttons, plus 2 additional digits from meter (or knobpots) by the units indicated by the Range button. For C or G that is the result. For R, calculate the inverse of G reading and multiply by the R range above the range button. For inductance and low impedance measurements, see the manual. |
16th Jul 2021, 5:27 am | #8 |
Diode
Join Date: Jul 2021
Location: Gold Coast, Queensland, Australia.
Posts: 5
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Re: Wayne-Kerr B641 Automatic Balance
Caution, updated procedure in a later posting
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