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| Agilent E7495 linux root account |
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| DogP:
Does anyone know what the actual differences are between the E7495A and E7495B? I know the front panel of the E7495A says 10MHz-2.5GHz and E7495B says 10MHz-2.7GHz, but as far as I can tell, both have the same frequency ranges (spectrum analyzer goes from 500KHz to 2.7GHz, antenna/cable analyzer and signal generator goes from 375MHz to 2.5GHz). The only differences I've found (though can't confirm since I don't have both to actually compare) are that the B has the DC Bias option, the signal generator has slightly higher maximum output power for most signals, and accepts more external reference frequencies. Did the B come out after the A and have an upgraded CPU, memory, flash, or anything like that? BTW, I did some more testing on waveform files, and it appears that the largest file it'll fully process is 2MB (corresponds to 200ms @ 2.5Msps, or 2s @ 250Ksps). I haven't gotten it to actually play any longer than the original file length though. Thanks, Pat |
| DogP:
I've noticed a few strange things with my E7495A... can anyone else confirm that these are or are not normal, and that your box does what would seem "normal"? 1) Fairly regularly when I turn the box on from the off state, the screen lights up, then fades to black, but it doesn't actually boot (nothing shows on the screen at all). I press the power button again to turn it off (either off or standby), and then press it again, and it boots fine on the 2nd attempt. It doesn't look like it's an LCD issue... it looks like it's just not booting (it never connects to the network, when it does come on it goes through the full boot process, etc). 2) When I connect a GPS antenna with a good view of the sky, I easily get GPS (bottom left says GPS Locked), location usually shows ~8 satellites tracked, but the GPS icon in the bottom right never goes to the green dot (I've left it tracking for over 24 hours). It always stays at the yellow triangle. Because of that, I can't run the Time Base Adjustment (it requires me to wait for the green dot). Switching to the internal reference shows a green dot, and the frequency accuracy seems pretty good, so I don't think the TCXO is bad. Also, I noticed that it shows time on the screen, but it never gets set to the correct GPS time (and it appears that the time/date gets reset to the time/date that was set at boot every 30 seconds, even if I manually set it over telnet). The GPS location looks correct though (drops a dot right on my neighbors house :-P ). 3) I rebuilt my 2nd battery pack, and like the first one, going through the battery recalibration procedure never finished. It says that it'd take up to 12 hours, and on the first battery I left it running for almost 2 days and it never finished, so it aborted... on the 2nd battery, I left it running since I rebuilt the pack on Friday night... so almost 5 days. I finally aborted it tonight. The battery voltage was slowly creeping upward around 12.4 (going up around 10mV per day) but never hit 12.6V (4.2V per cell)... not sure if it didn't think it was done because of that, or something else. It almost always showed 0 mA current. The percentage shown is usually 99%, though it sometimes bounces down to 98% or up to 100%. The battery life seems fine (~1.5 - 2 hours per battery), so I'm not too worried about it... just seems strange (and my OCD would like that fuel gauge error to say 0%, not 10% ;) )... I also tried just running the batteries down and recharging them normally, but that didn't make a difference. Related to that... the 2nd battery rebuild went smoother than the first. I'll update my rebuild post above with a couple more notes/pics. BTW, I did a fresh firmware install of 6.25 (pressing the bottom right button, across from NO), and it didn't make any difference. Thanks, Pat |
| TheSteve:
Are you using the factory power adapter? Does the unit always boot first try with the batteries removed? |
| DogP:
--- Quote from: TheSteve on November 02, 2016, 06:15:30 am ---Are you using the factory power adapter? Does the unit always boot first try with the batteries removed? --- End quote --- I'm using an aftermarket power adapter... actually, I've tried two different ones (one of them is a generic 24V 5A supply, the other is a universal 19.5V laptop power supply). Unfortunately, it's not something that I can reliably reproduce. I was able to get it to happen running from battery only, with the 24V supply with a battery installed, and with the 19.5V supply and no battery installed. Not sure if it's a temperature, cap, etc. issue... I assume it's not normal, but wondering if anyone else has run into this issue. Thanks, Pat |
| jwm_:
Anyone figure out a fix for the screen bezel coming undone? The system works fine, but part of the screen is obscured. Picture attached |
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