开云体育

USB is not interrupt driven. When a USB device needs service it has to cross its legs and wait until it is polled by the Operating System. Because it has to be polled anyway, for the low speed stuff

Al, Try ko4bb.com. There is a low serial number 465 manual there. --John Gord

I found a 465 service manual (some 291 pages worth) on the web that is labeled for SNs 250,000 and up. My scope is a much earlier one, SN in the B032,000 range. Is there a service manual available,

Hey everyone, Just wanted to introduce myself. I am getting into electronics and have been toying with them for the last 8 months, and love it i want to learn MORE!!! I have repaired 3 CRT arcade

If I recall correctly, the original poster had pretty modest GPIB requirements. I also found myself wanting to some simple interfacing with a couple of GPIB instruments that I have (a TDS540 and a

OS? take the problem back to the cause! With the prologix adapters (both), what does it say when SRQ is raised by any device on the buss... for whatever the reason? nothing.

I'm trying to help others from thinking it's a real GPIB controller that will grow with their system. Same price and you can get a real NI PCI-GPIB card off eBay. The fact that it uses a t

David Gravereaux wrote: You can believe that if you want, but your OS knows the truth.

cleyson@... wrote: There's a 4041 out there right now for $75 BIN. :-) -ls-

Hi A cheaper and perhaps less complicated option would be to either buy or build a RS232 or serial USB to GPIB converter. There are a few open source projects, and of course the Elektor GPIB

Like Tom says, you can use channel 2 to probe channel 1. Just be careful not to allow the probe ground lead to touch anything except ground. I would take a careful look at the channel 1 BNC connector

A Common failure on 4xx scopes are the solder joints inside the input attenuators. They are white plastic rectangular things with 100X, 10X, etc marked on them. They have component numbers between C30

Use channel 2 to trace the signal in channel 1. Work through to the channel switch. Tom

If it's running on the CPU, it's running on the CPU. At GPIB service rates, the benefits of doing so at ring 0 are either nonexistent, or arise from suboptimal architectural decisions at the

My 475 channel 1 is pretty much dead it comes on intermittently mostly dead. channel 2 works perfectly. I had this problem since I got it but It was originally mostly working and has just gotten to

Let's define what asynchrous means, shall we? Asychronous means at it's core, that without having to ask, you are given through an alert mechanism. And BTW, the OS isn't watching the hardware lines,

Looks like it got dropped. 73, Dick, W1KSZ

No affiliation. Ebay 121083990160 Jay

Well, no, it isn't "telling you" anything The OS is doing the polling on your behalf in a way that makes it look asynchronous to your code, but is not. At GPIB speeds it's normally just fine to do

Not one bit. An example to a DM5010 to setup async reading of measures: -> ACV; RQS ON; MODE RUN now when SRQ is raised with a status byte from it of 132 returned from the serial poll, I call ibrd()