Hi Demian,
Thanks! That explains it. It was a joint venture between Intersil and Fluke. I had chip samples from Intersil and other manufacturers (like Motorola). I still have three Fluke 8200A meters, one with the AC and Ohms converters. Those were optional. Also had an NLS, and some early Heathkit digitals. Also had a B&K 820 and 2830 (still have it).
I wonder what the patented circuit Fluke had designed was, or what it did. One thing Fluke does very well are voltage references, the current HP/Agilent/Keysight 3458A uses a Fluke modified voltage reference.
Later on I preferred the HP meters and have a bunch of those along with some Fluke handheld types.
The problem with reading links you send is I end up branching off onto other related links. Great reading!
Thanks! That explains it. It was a joint venture between Intersil and Fluke. I had chip samples from Intersil and other manufacturers (like Motorola). I still have three Fluke 8200A meters, one with the AC and Ohms converters. Those were optional. Also had an NLS, and some early Heathkit digitals. Also had a B&K 820 and 2830 (still have it).
I wonder what the patented circuit Fluke had designed was, or what it did. One thing Fluke does very well are voltage references, the current HP/Agilent/Keysight 3458A uses a Fluke modified voltage reference.
Later on I preferred the HP meters and have a bunch of those along with some Fluke handheld types.
The problem with reading links you send is I end up branching off onto other related links. Great reading!
Its all a real hazard. Some days I get little done.
I have a brace of meters-Fluke 8506A, Keithley 2015 and a Prema 6001 as serious meters. They all agree to a degree (50 ppm. . .) And enough cal stuff to never have everything running. However I'm as likely to use a Fluke 8060 for audio. More is just (as an engineer described to me a long time ago) resolution polution.
I have a brace of meters-Fluke 8506A, Keithley 2015 and a Prema 6001 as serious meters. They all agree to a degree (50 ppm. . .) And enough cal stuff to never have everything running. However I'm as likely to use a Fluke 8060 for audio. More is just (as an engineer described to me a long time ago) resolution polution.
Well Demian, you learn to say to yourself "it's about x.xxx" instead of reading all the digits. I learned on analogue meters, which is valuable when not taking an exact reading and having to calculate errors. I can ignore a string of digits easily.
One thing I love about the 34401A is you can easily select how many digits are displayed. You usually can with many meters, it's just easy on the 34401A.
My 8200A was accurate to the LSD, and most times you didn't have that 1 count error. They only displayed so many digits and the meter was accurate well beyond that. They were always in tolerance when testd, so are my other HP - Keysight meters.
I only have a 4 1/2 digit Fluke meter calibrator. 5100B I think.
One thing I love about the 34401A is you can easily select how many digits are displayed. You usually can with many meters, it's just easy on the 34401A.
My 8200A was accurate to the LSD, and most times you didn't have that 1 count error. They only displayed so many digits and the meter was accurate well beyond that. They were always in tolerance when testd, so are my other HP - Keysight meters.
I only have a 4 1/2 digit Fluke meter calibrator. 5100B I think.
To your point on reading links and pages. Yes! It is a hazard because it is so interesting. I've lost a lot of time reading good links (like yours).
This is a bit ancillary but a lot of the old led segent displays use a Ton more power than modern LEDs. Nobody seems to be in a rush to come out with new designs because graphic displays can do so much more and are cheap to implement. I shopped all over for a modern 10 segment bar graph display recently and ended up using 0802 chips with 20 times less current and you still have to look at them off axis unless you want to see dots for the next ten minutes
Yes that is true. I think that 1970's 7seg digits would need 10mA or 20mA whereas a modern high intensity 7seg digit today needs 1mA for the same brightness.
I admit bias, a long time ago I was a "wireline logging engineer" so running probes in wells, vital displays were Depth, Speed and Tension, all 7seg LED. The Depth display would range from -9999.99 m to +9999.99 m (or equivalent in feet and inches) There was British and American equipment but always always the Depth display was sacred, was always 7seg Red LED digits. Loosing Depth display was very bad news and seldom happened, the 7seg Red LED's never let us down. The counting logic was TTL, the Encoders were Swiss. As a nod to DiyAudio - there were several types of acoustic probe. Processing sound became increasingly important as the years went by.
Yes and the worst part about it is the maximum allowable current was 10 to 20ma, so if you ran them very bright it would only be for a few months or years. I did find a more recent bar graph display with a lot better efficiency but I was in need of something smaller for my application. I think without diffusion I could do with 200uA and still see it well outside. Granted, I did spend a lot of time looking for the most efficient chips I could find, but they weren't any more expensive. The cool thing is they are incredibly linear and the packages don't have to be much bigger than the dice so if you were adventurous you could make a board with segments drawn out of strings of diodes to your content and have a very swell looking high efficiency display. Although of course the more paralleling you do the more current you spend..