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Perhaps not, but there are limits. For example, most people seem to regard FTDI's deliberate trashing of fake FTDI serial/usb chips as beyond the pale. While that is an extreme example, I'd put

Whereas HP used to provide service manuals with full schematics, the amount of service information in Keysight manuals is next to useless if you want to repair an instrument. In parts of Asia,

Well, HP put more money in R&D than the likes of Rigol etc ever did. So it is more a sign of the times I'd say. Wilko

Hi Jeff, You can get magnetic bases for GPS units. Alternatively, if you have a bargeboard (facia) under your gutter, there’s a piece of TV hardware called a hockey stick, or J pole:

Problem solved - That's exactly what a phase meter would have done for you. John

Looking at an eBay photo, I see the fastest sweep speed is 0.01 mS/Div. If 10 MHz were visible, it would show 100 cycles of waveform across the screen, not useful for seeing the waveform drift across

Unless that scope has a filter designed specifically to limit the bandwidth, you should see a gradual rolloff past the specified bandwidth. If by chance you are using a 1x probe, that's your problem.

Hi, I think you're mixing up my project (OP) with someone else's question about using a difference freq to drive a meter. I already have a tiny OLED display which shows the difference in both numbers

As you already have a MCU in your circuit, it could be used to produce a voltage proportional to the frequency difference. An external DAC, R2R or even PWM can generate the voltage you need. Regards,

As the original poster, perhaps now is the time to mention/remind that I built the "difference frequency" device because it was fun/interesting, NOT because I didn't have a good way to fine-tune an

While the scope response will start falling off at 6 MHz, most scopes will have a usable response at 10 MHz, just not accurate for voltage measurements If the trigger circuit doesn't work at 10 MHz,

I keep my live GPSDOs feeding a two channel scope. The sines tell me a lot more about the health of both systems than some other instrument, and we had a spare 2ch scope that nobody wanted to use.

Dear: If there are not many pretensions, let's not forget that to calibrate two oscillators you can use any oscilloscope in XY mode (I prefer the tube ones). Has it already been discussed? apologies

If you put money into R&D, it doesn’t seem unreasonable to try to prevent others copying your designs. As much as I not like to try to fault-find equipment, I can understand why companies do it. Dr.

Removing the markings from ICs is what the makers of CB noise gadgets did, back in the day. Why? Because (at the time) their $20 gadgets cost about 75 cents to make, and were so dirt-simple that any

Well, fly-by-nights called Rigol etc sand/laser the partnumbers from the generic chips they use. So it is not uncommon these days. I also hate this practice with a passion. Wilko

Jeff, A good Frequency Difference Comparator is a Tracor 527E. Ross Sent: Saturday, September 10, 2022 4:47 PM To: [email protected] Subject: Re: [Test Equipment Design &

Hi, Sanding Part Numbers off of ICs is a regular practice by many Car Alarm and some Car Audio vendors. Throw it away if traced to that part. McIntosh never did that but used House Part Numbers for

The last that I saw was in the mid '80s when ON TV dumped all of their pay TV decoders on the surplus market. I was laughing as guys were buying them by the hundred at the Dayton hamfest. About two

I have about 30 different Extron DAs on hand, along with some Grass Valley and a half dozen Extron video routers.