HP 651B MANUAL PDF

Virg An item that has been used previously. This item may be a floor model or store return that has been used. Back to eBay Home Return to top. Learn More — opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc. Have one to sell? Please enter 6 numbers for the Postal Code.

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In any case I happened to find a cheap HP B on EBay so I decided to splurge and buy it on the plus side, these things have about depreciated as much as they possibly can so after I use it with the C I can sell it and get most of my money back.

The B arrived on Friday so I decided to follow the creed and open it up before turning it on. The unit is classically well made HP gear. Very cool.

Taking the top cover off you can see that there is a lot of open space on the top side around the capacitors and switches. The setup is very sensitive to stray capacitance so tuning it required a set of TV tube tuning wands. Zooming in a bit and you can see the well machined gears for the main frequency dial - none of that plastic gear rubbish here.

This complex arrangement is the main range switch which selects the various resistors and capacitors to configure the specific range. This is where you actually do the tuning to bring the dial range back into alignment. If feeds into a JFET that is used as an impedance converter see section of the manual. The bottom of the unit contains the two main assemblies. The one on the left is A1 and it handles the power supply needs and the right is the oscillator and power amplifier circuits. It is very sensitive and you need to have the shields on for certain operations otherwise the results of the tuning will be incorrect.

You then put the shield and bottom cover on before continuing with the calibration. Removing the shield lets us see the full board. As expected it was all through hole.

At first I thought someone had already repaired the unit. However on further research it appears that there were multiple versions of the assemblies and at some point they were updated to use the TO packages. When I turned this unit on it was working on the top two ranges but not on the bottom ones. I suspect that the people who sold it simply turned it on with the range selector on a high setting, twiddled the knobs, saw the meter move and called it "good".

I had to remove and replace that JFET to get it to work. It went in and the lower ranges came to life. The peasants rejoiced! Step 15 on page even says "if the instrument malfunctions only on the lower four ranges, A2Q1 is probably bad. Hope you enjoyed the images.

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HP 651B MANUAL PDF

In any case I happened to find a cheap HP B on EBay so I decided to splurge and buy it on the plus side, these things have about depreciated as much as they possibly can so after I use it with the C I can sell it and get most of my money back. The B arrived on Friday so I decided to follow the creed and open it up before turning it on. The unit is classically well made HP gear. Very cool. Taking the top cover off you can see that there is a lot of open space on the top side around the capacitors and switches. The setup is very sensitive to stray capacitance so tuning it required a set of TV tube tuning wands.

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Kajikasa Please enter 6 numbers for the Postal Code. This item will be posted through the Global Shipping Program and includes international tracking. Hhp usually post within 2 business days of receiving cleared payment — opens in a new window or tab. Contact the seller — opens in a new window or tab and request a postage method to your location. Image not available Photos not available for this variation. See all condition definitions — opens in a new window or tab.

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