Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Specmaster:
--- Quote from: mnementh on May 23, 2018, 05:56:10 pm ---I believe tgzz (or was it tautech?) mentioned earlier that the default is 3V, and that you can Cal at 1/3 scale (1V), but inaccuracy would be 3 times as great at the high end of the scale. :bullshit: You would have to bring the displayed number down to read 1V, which I think will also be LOTS of button clicks... :scared:
mnem
Maybe we should do a musical number now...
--- End quote ---
Yes you are correct, but it wouldn't be a lot of button clicks, just a marathon button hold while it went from 3.0000 to 2.9999, to 2.9998 all the way to 1.0000 there is no speed up function unlike many other things were the speed gets faster the after holding the button down for a period, if there is it isn't working on mine. :(
bd139:
--- Quote from: Specmaster on May 23, 2018, 06:16:28 pm ---
--- Quote from: bd139 on May 23, 2018, 05:48:04 pm ---If it’s reading 3.0000 with no input it’s asking for 3.0000 to be applied.
AC amps should be fun. I’d stuff a 1k resistor, the FG, a known good meter and the 3478A in series and crank it as close as you can get to 3v and adjust the 3478A cal parameter.
Resistors I have a set of 0.1% RN55D’s and made the rest of the values up from 1% ones in series/parallel and measured them on the U1241C
--- End quote ---
I assume then if I stuff in as near to 3V as possible that I'd have to adjust the reading to reflect that of the other known meter?
When it comes to AC amps, do you mean 300mA rather then 3V as I wont be reading volts on the other meter??
--- End quote ---
If you can get 300ma out of your FG. Unlikely as at 50 ohms that’s 42v pp ish.
Mr. Scram:
I'm sorry you're having all these problems, Specmaster. Looking at it from the perspective of a neutral observer it's quite an entertaining story and there are a few lessons to be learned as well.
Specmaster:
--- Quote from: bd139 on May 23, 2018, 06:28:39 pm ---
--- Quote from: Specmaster on May 23, 2018, 06:16:28 pm ---
--- Quote from: bd139 on May 23, 2018, 05:48:04 pm ---If it’s reading 3.0000 with no input it’s asking for 3.0000 to be applied.
AC amps should be fun. I’d stuff a 1k resistor, the FG, a known good meter and the 3478A in series and crank it as close as you can get to 3v and adjust the 3478A cal parameter.
Resistors I have a set of 0.1% RN55D’s and made the rest of the values up from 1% ones in series/parallel and measured them on the U1241C
--- End quote ---
I assume then if I stuff in as near to 3V as possible that I'd have to adjust the reading to reflect that of the other known meter?
When it comes to AC amps, do you mean 300mA rather then 3V as I wont be reading volts on the other meter??
--- End quote ---
If you can get 300ma out of your FG. Unlikely as at 50 ohms that’s 42v pp ish.
--- End quote ---
I could get 300mA easily enough via a variac but at 50Hz?
bd139:
Variac isn’t going to be voltage stable enough. Mains is all over the shop.
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