HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 0

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 1

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 2

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 3

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 4

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 5

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 6

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 7

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 8

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 9

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 10

HP-8640 Opt USM-323 Main Oscillator Part # 08641-60100, US $40.00 – Picture 11

Hp-8640 Opt Usm-323 Main Oscillator Part # 08641-60100

US $40.00

Delaware, Ohio, United States
Mar 2nd

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HP-8640 Opt323 Main Oscillator Assembly This purchase is for one HP USM-323 Main Oscillator part number 08641-60100 with front casting number 40388 23. This includes the attached paddle board. Any other test equipment or cables shown in the photos is not included. This unit has been repaired, cleaned, lubed and tested by an ex-navy senior chief electronic tech. Please view all photos as they are part of the description. 1 - It was dissassembled, cleaned, lubricated, reassembled and adjusted and tested for proper output levels and frequencies across the band (See Chart.) 2 - The pile-up gear was cleaned and inspected with end stops adjusted for minimum and maximum oscillator frequencies as listed in the tech manual. 3 - The VT pot gears were inspected and repaired as necessary. The VT Pots were properly positioned and adjusted to work correctly with the pile-up gear. The Vt adjustment was made to trigger the relays in the devider-filter assembly within the proper frequency range. Vt adjustment on paddle board may be needed once installed in your unit. 4 - The oscillator fine tune control was tested to fall within the 200ppm specification. (Frequency shift depends on band selected.) 5 - The above tests were made after a three hour warm up and stabization period as required for this signal generator. 6 - Upon instellation of this oscillator in your Opt-323 sig gen, expect frequencies to be high and will drift downward as the unit warms up. This is normal for this signal generator as it does not have frequency locking like the regular HP-8640. This is not due to a faulty main oscillator. 7 - A test sheet is included showing the tests performed with results. 8 - This main oscillator assy. was connected to a working HP-8640 Opt-323 to ensure proper preformance when installed in a Opt-323 signal generator. This unit will NOT work in a regular HP-8640B. 9 - Any tests requiring use of a spectrum analyzer were not preformed, but I believe the oscillator should fall within specs. for this unit. All frequency, dBm levels, waveform and voltage tests were made with the following equipment respectively. HP-8640B Signal Generator in Frequency Counter X10 Mode and USM-323 Frequency Readout. HP-432A Power Meter w/HP-8487B Thermistor Mount Tektronix O-Scope Model 2225 and/or 465m (425 military version) Tektronix DM-501A Digital DC and AC True RMS Voltmeter Frequency measurements made using an HP-8640 Sig Gen in frequency counter mode compared equally to the reading on the USM-323. Power levels measurements of the two oscillator buffer cards took into account any DB losses in connectors or cables used in the tests. This provides for reasonably accurate results. For best performance of your HP-8640 Opt-323, some adjustments of your unit may be necessary to maintain calibration after instellation of this refurbished oscillator. This will be determined by your usage and accuracy needed by you. Condition notes: 1 - This is a used unit and has surface scratches and glue residue - normal for age. 2 - The VT pot gears were repaired and display a gray glue line. This repair included removal of the brass hub, gluing the gear(s) at the fractures, re-drilling the center hole to releive stress of the shrunk plastic. The hub was re-inserted and re-glued into the gear(s). The set screw holes were re-tapped and new set screws installed. 3 - Nothing in notes 1 & 2 prevent proper operation of this unit. I want you to be happy with your purchase. If there should be a problem or in the event the shipping company does their best to use it as fork truck target practice, Please let me know prior to leaving negative feedback. I strive for 100 percent positive feedback. Please leave positive five star feeedback once you have it installed and are happy. I try to describe my sale items accurately. I can't fix a problem if I don't know about it. Refund only if not as described. I am an honest seller and expect the buyer to be the same. Please don't swap parts and try to return a "defective" item. Payment via PayPal is due within three days of purchase. I usually ship the next working day after receipt of payment. So I don't inadvertantly break any government regulations, I will not ship this item outside of the US. Sorry. By bidding on this item, you agree to all as listed and have the expertise to install this item correctly and you will take all precautions working around the hazzardous voltages present in the HP-8640 - Option USM-323 Signal Generator and will hold the seller harmless for any actions you may take. CAUTION!! Never store either the HP-8640 or Opt-323 sig gens on end (Controls facing up.) This causes the sillicon lubrication around the cavity slide in the main oscillator to migrate to the oscillator transistor and or veractor diodes, and causes intermittant or non-operation at various parts of the tuning range of the main oscillator assembly. If this happens, place the sig gen in the normal horizontal operating position. Store in a warm space with no power for several months. This may repair a dead oscillator. Please contact me if you have any questions via ebay email. I check my email many times a day and will try to answer promptly. Please ask all questions prior to the final hour of bidding so I have time to respond. Thank you for looking and have a good winter/spring. Good luck bidding.

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	HP
MPN	08641-60100
Model	8640 Opt. USM-323
Country/Region of Manufacture	United States