Generally, whenever I've had a non manufacturer 'calibration' it's been a certification service that tells you your equipment is within spec and gives you the variances and probability of uncertainty, a pass/fail test.
Where equipment was out of spec then any service to bring it within spec was usually charged extra but the level of equipment we needed meant the test year was thrown away and new was purchased it was cheaper than having it adjusted. I sent my HP 3457A in for cal. I should be getting it back next week. I won't mention where I sent it, but it wasn't Keysight (I don't like that name). I recently changed the SRAM battery and purposely did not save the cal constants. I bought the meter second hand and it wasn't in spec when I bought it. I didn't care what the past data was. The service manual lists an entire sequence of procedures for calibrating this DMM, starting with storing values for zero and full scale into the SRAM. All of this is done via the front panel, by pushing buttons. I just found out that this part of the procedure is not normally done (at least by the lab I sent the DMM to). With no pre-existing cal constants, the tech I spoke to was rather annoyed that he was having to spend the time doing the hookups and pushing buttons for each function and range to store the zero and full scale values. I was told this added an extra hour to the normal procedure. Not knowing what is normally done in the cal lab, I assumed that the entire procedure as listed in the service manual would be done. It seems that I was wrong. In the end, the lab decided not to charge me for the extra time involved. I thanked them for that. My question is, do any cal labs (including Keysight) normally perform the zero and full scale procedures as listed in the service manual? Joe Gray W5JG _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
