Do you mean some devices load the bus more than allowed by IEEE 488.1, or that they load it more than a wimpy micro that does not conform to IEEE 488 can drive? GPIB drivers are supposed to be pretty beefy and able to drive up to 20m of cable and up to fifteen devices at the same time.
By the way, you could skip X on all but the last command, or even write it as a single string (K0F0R3Z0...X).
The 244 octal 3state bus driver is able to drive 8 gpib units. AVR cpu can drive not more as 4 units directly.
Pic cpu is superior to 244 driver.
What fool AVR:
GPIB high is stated at 2V min and low at 0.8V max.
AVR cpu have 3V min for high and 1.5V max for low at 5V and when driving -20ma the voltage is 0.9V max from Datasheet.
If instead the AVR cpu is running at 3V, things changes, 2V min for high and 1V max for low. Driving -10ma the voltage is then 0,6V
and the limit of 10mA instead of 20mA reduced the number of devices to max 4.
If you use AVR without drivers, then (avr) Arduino must be 3.3V powered for driving it directly, otherwise 74..244 drivers are needed for 5V operation.
where the specification allows 30 devices on one bus, but only 2/3 can be powered at the same time.
I have logged in and browsed, but was unsuccessful in creating a USA_Cal_Club directory and adding my data. I am not an FTP maven so am sure I am doing something wrong. Will look into it.
Group funded calibrator (if we talking real calibrator, like 5440/57xx/480x) is really worst idea possible .
What works though is local voltnut gatherings (2-4 people) for extended time (at least a week, best if 2-3 weeks) around a crazy voltnut which has calibrator, supporting gear and history in calibrated gear. That justify for visitors to bring their stuff and run it for days/week to get it all nice and stable.
Group funded calibrator (if we talking real calibrator, like 5440/57xx/480x) is really worst idea possible .
What works though is local voltnut gatherings (2-4 people) for extended time (at least a week, best if 2-3 weeks) around a crazy voltnut which has calibrator, supporting gear and history in calibrated gear. That justify for visitors to bring their stuff and run it for days/week to get it all nice and stable.
TiN - I already acknowledged this was a bad idea at the end of my post. However, I deal mostly with 3.5 - 5.5 digit DMMs, not in the Volt-Nut realm. Weeks of stable operation in a controlled environment is not really needed at the 4.5 digit level. I was just frustrated that I have no low cost way to fully calibrate many of my low end DMMs. I'm not paying a cal service for old multimeters for hobbyist use.
Now in regards to gatherings of Volt-Nuts with all this cal gear, who are you, where are you, who would organize these voltnut gatherings? Is there really an EEVblog forum member willing to share his high end equipment? I would if I had it, but then I'm retired now and have time. I'm talking about a true multifunction Calibrator.
I'm not paying a cal service for old multimeters for hobbyist use.
Who would organize these voltnut gatherings?
Is there really an EEVblog forum member willing to share his high end equipment?
Now in regards to gatherings of Volt-Nuts with all this cal gear, who are you, where are you, who would organize these voltnut gatherings? Is there really an EEVblog forum member willing to share his high end equipment? I would if I had it, but then I'm retired now and have time. I'm talking about a true multifunction Calibrator.
Now in regards to gatherings of Volt-Nuts with all this cal gear, who are you, where are you, who would organize these voltnut gatherings? Is there really an EEVblog forum member willing to share his high end equipment? I would if I had it, but then I'm retired now and have time. I'm talking about a true multifunction Calibrator.
I'd gladly take the time to share my equipment, including travel and hotel expenses.
The Volt-Nut community here is growing stronger, lots of good equipment is being restored, stable homebrew stuff being born, looking forward to the future.