| Calibration procedure, general: Select calibration parameter by setting SETUP switch 1-5 ON. Display shows HOLD and the selected function for 2 secs. Enter the wanted value with the UP and DOWNbuttons. Set SETUP switch OFF, backlight flashes and HOLD display extinguishes. Range adjustment, calibration mode ON (LPP420 only): Connect any current signal between 4 and 20 mA to the instrument. Set switch 1 ON, and enter the wanted display reading for 4 mA input. Set switch 2 ON, and enter the wanted display reading for 20 mA input. Range adjustment, GP422 and LPP420, cal. mode off: Connect minimum input signal, f.inst. 4 mA to the instrument. Set switch 1 ON, and enter the wanted display reading for min. input. Connect maximum input signal, f.inst. 20 mA to the instrument. Set switch 2 ON, and enter the wanted display reading for max. input. Select input type, (switch 4, GP422 only): 1:0-20mA(A) 2:0-10V(10U) 3:0-1V(1U) Select contrast, (switch 5, GP422 only): Selection 0-7, 0 = min. contrast, 7 = max. contrast NE43 mode, (switch 5, LPP420 only): ON: display shows "---- " if input signal out of range. OFF: display shows the actual value if possible. |