Products > Test Equipment
Agilent E7495 linux root account
kirill_ka:
--- Quote from: technogeeky on March 06, 2017, 08:21:07 am ---
Also, I played around with the files in /flash/egServer/Dragonfly/Recievers, like E7495A and CPXSRC. You can indeed change things here and sometimes see the effects (e.g. you can change E7495A to have Freq Range be 3000e6, and it makes it possible to enter that value). However, some of these changes will have no effect for other reasons (here, I assume it's because there is actually a filter which sharply cuts off at ~ 2.7GHz).
--- End quote ---
Limitations are spread in configs, gui, elgato, dsp code and hardware. I mean along with configs there are many hardcoded values.
kirill_ka:
--- Quote from: technogeeky on March 04, 2017, 08:40:29 am ---Another few questions:
1) Is it possible to keep the power meter reference output on but go back to the spectrum analyzer window, to see it? Apparently this is possible to do with the signal generator, but not with the spectrum analyzer.
--- End quote ---
There's a separate serial port which is used to communicate with power meter hw. It's closed immediately when you exit the power meter. If I have time, I'll try to decode the protocol.
PA0PBZ:
--- Quote from: kirill_ka on March 07, 2017, 09:30:52 am ---
--- Quote from: technogeeky on March 06, 2017, 08:21:07 am ---
Also, I played around with the files in /flash/egServer/Dragonfly/Recievers, like E7495A and CPXSRC. You can indeed change things here and sometimes see the effects (e.g. you can change E7495A to have Freq Range be 3000e6, and it makes it possible to enter that value). However, some of these changes will have no effect for other reasons (here, I assume it's because there is actually a filter which sharply cuts off at ~ 2.7GHz).
--- End quote ---
Limitations are spread in configs, gui, elgato, dsp code and hardware. I mean along with configs there are many hardcoded values.
--- End quote ---
If the 7495 is anything like the N1996 (and we have a lot of reasons to believe so) you will not be able to go above 2.7GHz.
The N1996 has 2 receive paths, one for 0.1MHz - 2.7GHz and the other for 2.7GHz to 3/6GHZ. Since the N1996, depending on the model, has an upper limit of 3 or 6GHz both receive paths are there, and that is why you can change the 3GHz model to 6GHz by changing the upper limit value. Since the 7495 goes to 2.7GHz only I assume that the upper part is missing in the 7495. See below the N1996 receive path:
technogeeky:
--- Quote from: PA0PBZ on March 07, 2017, 10:01:22 am ---
--- Quote from: kirill_ka on March 07, 2017, 09:30:52 am ---
--- Quote from: technogeeky on March 06, 2017, 08:21:07 am ---
Also, I played around with the files in /flash/egServer/Dragonfly/Recievers, like E7495A and CPXSRC. You can indeed change things here and sometimes see the effects (e.g. you can change E7495A to have Freq Range be 3000e6, and it makes it possible to enter that value). However, some of these changes will have no effect for other reasons (here, I assume it's because there is actually a filter which sharply cuts off at ~ 2.7GHz).
--- End quote ---
Limitations are spread in configs, gui, elgato, dsp code and hardware. I mean along with configs there are many hardcoded values.
--- End quote ---
If the 7495 is anything like the N1996 (and we have a lot of reasons to believe so) you will not be able to go above 2.7GHz.
The N1996 has 2 receive paths, one for 0.1MHz - 2.7GHz and the other for 2.7GHz to 3/6GHZ. Since the N1996, depending on the model, has an upper limit of 3 or 6GHz both receive paths are there, and that is why you can change the 3GHz model to 6GHz by changing the upper limit value. Since the 7495 goes to 2.7GHz only I assume that the upper part is missing in the 7495. See below the N1996 receive path:
--- End quote ---
Do you have any idea about extending the range (power) or (frequency) of the signal sources? Also, it seems the N1996A has a zero-span mode. I wonder if this could be enabled on this device. Also, I wonder if we can expose the number of sample points (in fact, I find it downright weird that these aren't at least listed somewhere, let alone adjustable).
TheSteve:
--- Quote from: technogeeky on March 07, 2017, 04:06:52 pm ---
Do you have any idea about extending the range (power) or (frequency) of the signal sources? Also, it seems the N1996A has a zero-span mode. I wonder if this could be enabled on this device. Also, I wonder if we can expose the number of sample points (in fact, I find it downright weird that these aren't at least listed somewhere, let alone adjustable).
--- End quote ---
I was able to extend both the power and frequency range of the signal source in a N1996A. The power range difference was only a few dB so I changed it back to stock as the real maximum output varied with frequency. I extended the frequency range down to 1 MHz from 10 MHz. I believe the E7495A has similar text files which can edited however I have read someone tried lowering the source range on an E7495A in the past and it would crash the unit when you tried to enter a lower frequency.
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