A
AlbertPaglinawan
...what can we do?
The service manual of wavetek 9100 said in section 10.4.6.2 Calibration Equipment Requirements, it suggested the use of Wavetek 1281 DMM. It always sugested 1281 DMM in other sections but this DMM is less accurate than the Wavetek 9100 in currents and some of resistance functions.
The manual also said there should be at least 3:1 TUR.
Please allow me to put these into numbers:
AC current to be measured: 3mA at 3kHz output
Accuracy of 9100: +/- 2.4 uA
Accuracy of 1281: +/- 132.9 uA
Accuracy of 9100:
= 0.07% output + 300 nA
= (0.07%) (3 mA) + 300 nA
= 2.4 uA
Accuracy of 1281:
(I used the range 10mA)
=300 ppm Rdg + 100 ppm FS + 130 ppm
=(300ppm)(3mA) + (100ppm)(10mA)(2) + 130 ppm
=132.9 uA
I wonder why the manual suggested the use of 1281 DMM in calibrating the current function of 9100 Multifunction Calibrator. I was under the impression that 1281 is 4 times or greater more accurate than 9100.
To those of you who uses this equipment, you might see in the calibration certificate that Fluke used 1271 DMM (an even lower model than 1281). How come?
I am sooo lost! My computations might be off but I really don't think so. Anyone who wants to correct me, please do so and I would be very much glad for it.
Hey, thanks in advance! I am happy that the forum is now back on-line.
cheers!
The service manual of wavetek 9100 said in section 10.4.6.2 Calibration Equipment Requirements, it suggested the use of Wavetek 1281 DMM. It always sugested 1281 DMM in other sections but this DMM is less accurate than the Wavetek 9100 in currents and some of resistance functions.
The manual also said there should be at least 3:1 TUR.
Please allow me to put these into numbers:
AC current to be measured: 3mA at 3kHz output
Accuracy of 9100: +/- 2.4 uA
Accuracy of 1281: +/- 132.9 uA
Accuracy of 9100:
= 0.07% output + 300 nA
= (0.07%) (3 mA) + 300 nA
= 2.4 uA
Accuracy of 1281:
(I used the range 10mA)
=300 ppm Rdg + 100 ppm FS + 130 ppm
=(300ppm)(3mA) + (100ppm)(10mA)(2) + 130 ppm
=132.9 uA
I wonder why the manual suggested the use of 1281 DMM in calibrating the current function of 9100 Multifunction Calibrator. I was under the impression that 1281 is 4 times or greater more accurate than 9100.
To those of you who uses this equipment, you might see in the calibration certificate that Fluke used 1271 DMM (an even lower model than 1281). How come?
I am sooo lost! My computations might be off but I really don't think so. Anyone who wants to correct me, please do so and I would be very much glad for it.
Hey, thanks in advance! I am happy that the forum is now back on-line.
cheers!