2024年2月8日 · The 8656A uses a component 0960-0442, a Corcom F2058. There's still a few available on eBay, but they're all used, so chances are those RIFAs will be broken just the same.

2019年6月14日 · A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.

Figure 3-7 of the manual (downloaded from Keysight) says: "Female BNC connector (J3) accepts an external 1, 5 or 10 MHz (+/-0.005%) time base reference input at a level of 0.2 to 0.4 Vrms into 50 ohms."

2022年6月4日 · A very good point bd, and food for thought moving forward. I had assumed that since the missing parts left an open circuit in an essential part of the unit, that I ought to start there, but your comment makes a lot of sense.

2023年4月25日 · Great to see the 8656 information continue to flow, thanks for posting up swainster! It's really interesting to see the B version. The back transformer/power section is particularly interesting to see. HP was really changing and - …

2023年5月15日 · I checked the 1854-0247, and the DC voltages at the emitter and collector seemed a bit off compared to the schematic (+13V, -0.3V vs +11V, -0.7V).

2019年10月14日 · Hmmm..Seems HP is real good at creating useless features, like HP-IB interface, Continuous fan running, Forgetful Storage.

2023年3月12日 · Pokin' around the web quickly affirmed the decision to spend just a little bit on this beast. Using bandwidth alone as a comparative criteria, even a modern unit from Asia is north of a $1000. I'll take the 8656's interface any day for …

2019年2月3日 · It was set to -10dBm at the time, and turning it down to -30dBm did seem to make it a lot more reliable. But if it was a VSWR problem, wouldn't it behave like this with the output disconnected?

2021年4月11日 · I'm about to take a look at a friend's HP 8656B signal generator. It's an option 1 with a 2838 serial. He reports that he can't get full output anywhere but he believes the attenuator is working.