iET PRS-300 Series, Руководство по эксплуатации, Страница: 37 / 50

MAINTENANCE
PRS-300 Series
27
During the adjustment process the
fi rmware cycles through each resistor and the
technician can enter the measured resistance
value in ohms. This should be done with a
minimum of 7 ½ digits of resolution. The
accuracy of measurement should be signi
fi -
cantly more accurate than the ±(70 ppm + 1
m
Ω ) for all resistance values.
To enter into the calibration process,
press the MENU key and then select 3 for
calibration. At the end of the process all cali-
bration values will be saved into memory.
At anytime pressing the MENU key will
exit calibration without making any changes.
IET Labs uses the Fluke 8508A, set to 7
½ digits of resolution, during the adjustment
process to ensure the PRS-300 meets speci
fi -
cations.
IET Labs offers the PRS-DMM software
which works with the PRS-300 and Fluke
8508A or Keysight 3458A to automate this
adjustment process. See Chapter 9.