| Products > Test Equipment |
| LeCroy LW420 Arbitrary Generator |
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| Wuerstchenhund:
--- Quote from: nctnico on June 06, 2015, 01:05:46 pm ---GPIB allows 15 devices on one bus (and one master) with a maximum length of 20 meters. USB is 'limited' to 127 devices on one port (using hubs) --- End quote --- Right, but the difference is that with GPIB that works in reality, while for USB that is more or less a theoretical limit only as often even 15 USB devices won't work flawlessly together. --- Quote ---and can be extended to around 50 meters with simple range extenders. --- End quote --- Which increase latency, which again can screw up your devices --- Quote ---I agree LAN is better but it brings along a lot of overhead (IP stack) for the test equipment to handle --- End quote --- That's not really an issue these days when almost any chipset and FPGA contains at least one network interface already. IThis aside, USB isn't the most ressource-saving protocol either (esp. USB 1.x and 2.0). --- Quote ---and all kinds of security issues especially when equipment is running Windows. --- End quote --- There are even more security issues with USB, who has been the target for many attacks in the past. LAN also isn't necessarily more insecure than GPIB, especially if the T&M network is kept separate from other networks and not connected to the open internet. This aside, Windows devices are not a higher security risk than non-Windows devices, but actually more easy to secure as it's widely known how to tighten it up, and new flaws issues get made public and (in the case of Windows versions that are still supported) also get fixed regularly. With non-Windows devices, it's pure guesswork what holes exist in a device simply because there are no regular security audits and intrusion tests, and even if a problem is found then it's pure luck if the device manufacturer can be bothered to actually fix it and provide an update for its customers. You wouldn't believe how many devices are out there that are still vulnerable to Heartbleed, and which will never get fixed (and worse, who's users will often never know that there is an issue). |
| Kryten 2X4B:
A few ago years I bought an LW420 at a local auction for AU$140. When I first powered it up there was nothing on the screen but HD access could heard while the system was booting. Before doing any trouble shooting I connected a VGA screen directly to the video card and got a colour display. LeCroy used two switchmode supplies in the LW420 one for positive rails and the other for negative. The rectifier diode for the -12V rail shorted and took out many of the components on the input side of the transformer in the neg supply without blowing either of the input fuses. Mr Murphy said "A $300 CRT protects a $0.30 fuse!! Anyway after tracking down two faulty ICs and a shorted cap on the main AWG board the LW420 was fully operational. I don't know if the AWG board components caused the supply to fail or failed because of the lack of neg supply. I must say the LeCory did a really good job with self-test as it made it easy to locate the sections of circuit that were faulty. |
| davorin:
Wasn't aware this device contains an Intel processor... Hmm...the seller lowered the price from Euro 699 to 649......what a bargain (o; |
| davorin:
And now it is at Euro 645 :-) So if I wait another 200 days I'll buy it (o; |
| analogRF:
--- Quote from: nctnico on June 06, 2015, 11:49:54 am --- --- Quote from: Wuerstchenhund on June 06, 2015, 06:50:31 am ---The WaveStation LW420 is a really nice (albeit as ntnico says big and noisy) AWG, with decent specs even by today's standard, and comes with GPIB (which none of the entry level AWGs do) --- End quote --- That is because GPIB has been replaced with USB a long time ago. My SDG1010 supports USBTMC for remote control. --- End quote --- would you mind explaining how you replaced the display with LCD? thanks |
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