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| Agilent E7495 linux root account |
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| kirill_ka:
--- Quote from: DogP on February 28, 2017, 08:19:10 am --- --- Quote from: technogeeky on February 27, 2017, 04:07:50 am ---2. Does anyone know the full list of power sensors that will work with this device? It seems like there are only one or two. --- End quote --- The manual specifies that it works with the 8481A, 8481D, and 8482A (and CFT variants). --- End quote --- I've read somewhere that 8484 should work. I got 8481D, but not tested yet - cable is on the way. --- Quote from: DogP on February 28, 2017, 08:19:10 am --- --- Quote from: technogeeky on February 27, 2017, 04:07:50 am ---5. I doubt I have any PCMCIA flash cards. Do I need to buy a specific size? Like really, do I need exactly a 64MB one? --- End quote --- I'm not aware of any limitations... I'm using an 8GB card in mine. --- End quote --- I use CF with CF to pcmcia adapter. Note that there's also CF slot (it works same as PCMCIA, but doesn't allow to close the door). --- Quote from: DogP on February 28, 2017, 08:19:10 am --- --- Quote from: technogeeky on February 27, 2017, 04:07:50 am ---6.The service manual mentions an optional, internal 90dB attenuator. But I can't find any reference to this anywhere else. Do any of your units have this? Do all units have it? Does nobody have it? --- End quote --- If mine has it, I'm not aware of it. --- End quote --- It's for signal generator (source). I think, it's included if it allows to change level to -90 dBm. |
| kirill_ka:
Here it is, ATTN OUT to J7/SOURCE IN connection. |
| technogeeky:
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. 2) Does anyone have the Service Test software? By this I mean the software package that lets you test all of the functions of the device, as described in the service manual. Perhaps this is something which is on the machine but is not available until you login as root (or some other method to gain access)? 3) In terms of disassembly, what actions are likely to destroy any hope of keeping the calibration? E.g. can I (without automatic ruining of calibration): * Disconnect the internal flexible SMA connectors? * Disconnect the internal rigid SMA connectors (without bending the rigid cables)? * Open the various metal cans, while being ESD protected and latex gloved, but without noting torque values for the screws? If you'd prefer, a qualitative assessment of what I can take a look at would be fine with me. I don't (yet) have a suitable torque wrench, so I don't think I'll be doing any of this until after I get one. But I've heard that it's common for these connectors to be overtightened from the factory, and presumably I wouldn't want to repeat that over tightening. Thanks! |
| DogP:
1) I don't think so, besides maybe manually poking a register under the hood somewhere to turn it on. 2) I assume you're referring to the "Agilent E7495A/B Performance Verification and Adjustment software"? I've never come across it, and I don't think it's on the unit itself... I'm pretty sure that's PC based software, similar to this: http://www.keysight.com/en/pd-1000000762%3Aepsg%3Apro-pn-N2717A/performance-verification-and-adjustment?cc=US&lc=eng . It seems like it's generally option 0BW, which includes service and calibration manuals and software, but I don't see this option listed for the E7495, so it may have never been available for customers. 3) I'd say you can open the case of the unit, but as soon as you disconnect ANY RF cable, you're going to ruin the calibration. Maybe you'll get it close to original spec, but it'll likely change slightly, and the whole point of calibration is that the system is calibrated for those conditions. Once it changes, you either need to recalibrate, or just live with the fact that your unit isn't calibrated. I don't know what you're hoping to see, but I definitely wouldn't remove any of the cans. It might not affect "calibration" much, but you'll likely affect the shielding effectiveness, and increase your noise floor, interference, spurs, etc. I've never heard about Agilent overtightening of the connectors... that's surprising (I'd figure Agilent would have a pretty good handle on connector torque). There are different torque specs depending on the connector material, specific type, and application though, so they might be tighter than the 8 in-lbs of a standard SMA torque wrench. For example: http://www.amphenolrf.com/connectors/sma.html says 4-6"lb recommended for commercial grade parts, 7-10" lb recommended for industrial/military grade parts, and 15" lb maximum for industrial/military grade parts. Generally, brass parts should be torqued less than stainless steel. Pat |
| technogeeky:
--- Quote from: DogP on March 04, 2017, 10:52:52 am ---1) I don't think so, besides maybe manually poking a register under the hood somewhere to turn it on. --- End quote --- OK. I'll take a poke around. I also want to reset all of the default setups because they are very silly for my usage. What the hell is "Chan 500" and why did they like it so much? :) --- Quote from: DogP on March 04, 2017, 10:52:52 am ---2) I assume you're referring to the "Agilent E7495A/B Performance Verification and Adjustment software"? I've never come across it, and I don't think it's on the unit itself... I'm pretty sure that's PC based software, similar to this: http://www.keysight.com/en/pd-1000000762%3Aepsg%3Apro-pn-N2717A/performance-verification-and-adjustment?cc=US&lc=eng . It seems like it's generally option 0BW, which includes service and calibration manuals and software, but I don't see this option listed for the E7495, so it may have never been available for customers. --- End quote --- Yes indeed. I really hope to get this one day, so perhaps someone here has come across it. I guess I could ask Keysight for it, but I doubt that will get very far. --- Quote from: DogP on March 04, 2017, 10:52:52 am ---3) I'd say you can open the case of the unit, but as soon as you disconnect ANY RF cable, you're going to ruin the calibration. Maybe you'll get it close to original spec, but it'll likely change slightly, and the whole point of calibration is that the system is calibrated for those conditions. Once it changes, you either need to recalibrate, or just live with the fact that your unit isn't calibrated. I don't know what you're hoping to see, but I definitely wouldn't remove any of the cans. It might not affect "calibration" much, but you'll likely affect the shielding effectiveness, and increase your noise floor, interference, spurs, etc. --- End quote --- Well, I am just very curious by nature; and I've never torn down any RF equipment. I also figured it would be nice to get pictures and/or part numbers and post them, since nobody has posted even block diagrams, let alone schematics. --- Quote from: DogP on March 04, 2017, 10:52:52 am --- I've never heard about Agilent overtightening of the connectors... that's surprising (I'd figure Agilent would have a pretty good handle on connector torque). There are different torque specs depending on the connector material, specific type, and application though, so they might be tighter than the 8 in-lbs of a standard SMA torque wrench. For example: http://www.amphenolrf.com/connectors/sma.html says 4-6"lb recommended for commercial grade parts, 7-10" lb recommended for industrial/military grade parts, and 15" lb maximum for industrial/military grade parts. Generally, brass parts should be torqued less than stainless steel. --- End quote --- I think my only references are two or three videos of Shahriar's @ The Signal Path. And perhaps it was specifically HP gear that was overtightened. In any case, given the above it won't be a problem since I won't be taking it apart. |
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