2021年10月18日 · What else is a suitable low cost, $500.00 or less alternative with low phase noise and I know it won't be as good as 8640B, like a Rigol or Siglent or their equivalent. …

2017年5月23日 · HP_8640B_switch_disk_1.png (303.44 kB, 599x453 - viewed 6342 times.) HP_8640B_switch_disk_2.png (486.45 kB, 800x500 - viewed 6098 times.) …

2022年11月16日 · Hi, I am looking for the service manual for HP 8640B - OPT 323. This is a military version of HP8640B. The problem is in the frequency counter circuit, it displays 60% of …

2019年3月11日 · Clearly being a vintage HP fan boy, I went searching for an older HP RF sig gen. There is a 8640B locally to me, but it is listed as having "no RF output" and a bent knob. I …

2024年8月30日 · Re: HP 8640B dead supply « Reply #7 on: September 02, 2024, 07:54:46 pm » Alright, I’ve had time to go through the service manual and have found a few issues (namely in …

2024年11月19日 · Hey all, I am currently troubleshooting a phase lock issue on my HP 8640B. I have gone through service sheet 4 where step 12 led me to service sheet 7. Reading through …

2024年9月14日 · If anyone has "HP 8640B Signal Generator Service Manual-8640B sup 1.pdf" from KO4BB, please upload it here. KO4BB's website seems to be broken right now. It's too …

2021年11月2日 · Bonjour, I have many of the HP 8640B excellent RF generators, with the original gears. Mechanical gear work requires complete removal of front panel and all the concentric …

2024年2月26日 · The HP 8640B should be generally good here as long as you keep the power output fairly low. I haven't used one for many years but I'd expect it to be good (in terms of low …

2021年8月5日 · Re: HP 8640B power supply problem « Reply #1 on: August 05, 2021, 05:09:40 pm » A crowbar is a fast-acting circuit that shorts the output should the voltage exceed a …