PROCEDUREv2.10
U P /R
       ***** DCX-127 DIGITAL MULTIMETER ADJUSTMENT PROCEDURE *****/R/R
           Copyright (C) 1988, 1991, 1992 Audio Precision Inc./R/R/R/R/R/R
THE DIGITAL MULTIMETER BOARD IS LOCATED UNDER THE GUARD SHIELD MOUNTED TO/R
THE DCX-127 MAIN CIRCUIT BOARD.  DO NOT REMOVE THE SHIELD FOR ADJUSTMENT!/R/R
A DC CALIBRATOR (<0.01% ERROR) IS REQUIRED FOR CALIBRATION.  PERFORM ANY/R
ADJUSTMENTS BETWEEN +20C AND +25C ONLY./R
/R/R/R/R/R/R
PRESS <Enter> TO CONTINUE, <F1> TO ABORT.../E
L T DMMZERO/R
/F2 /R/R/R/R/R/R/R
CONNECT A SHORT ACROSS THE DMM INPUT TERMINALS./R
ADJUST R2407 TO READ 0.00 mV, +\-0.03 mV.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O      R2407--> O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          | DMM BOARD/R
          --------------------------------/E
L T DMM2V/R
/F2 /R/R/R/R/R/R/R
CONNECT A DC CALIBRATOR TO THE DMM INPUT AND SET TO 1.8000 V./R
ADJUST R2101 TO READ 1.8000 V, +\-0.03%.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O <--R2101      O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          |/R
          --------------------------------/E
L T DMM0R2V/R
/F2 /R/R/R/R/R/R/R
SET CALIBRATOR TO 180.00 mV./R
ADJUST R2401 TO READ 180.00 mV, +\-0.05 mV.../R/R
          --------------------------------/R
          |/R
          |      R2401--> O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          |/R
          --------------------------------/E
L T DMM500V/R
/F2 /R/R/R/R/R/R/R
SET CALIBRATOR TO 500.00 V./R
ADJUST R2405 TO READ 500.00 V, +\-0.15 V.../R/R
          --------------R2405-------------/R
          |                 \/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          |/R
          --------------------------------/E
L T DMM200V/R
/F2 /R/R/R/R/R/R/R
SET CALIBRATOR TO 180.00 V./R
ADJUST R2501 TO READ 180.00 V, +\-0.05 V.../R/R
          -----------------R2501----------/R
          |                    \/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          |/R
          --------------------------------/E
L T DMM20V/R
/F2 /R/R/R/R/R/R/R
SET CALIBRATOR TO 18.000 V./R
ADJUST R2503 TO READ 18.000 V, +\-0.005 V.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O <--R2503/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |/R
          |/R
          --------------------------------/E
L T DMM2K/R
/F2 /R/R/R/R/R/R/R
DISCONNECT CALIBRATOR AND CONNECT A 1.5-1.9 kOHM STANDARD TO THE INPUT./R
ADJUST R4201 TO MATCH THE READING TO THE STANDARD, +\-0.03%.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |    \/R
          |    R4201/R
          --------------------------------/E
L T DMM20K/R
/F2 /R/R/R/R/R/R/R
CONNECT A 15-19 kOHM STANDARD TO THE INPUT./R
ADJUST R4202 TO MATCH THE READING TO THE STANDARD, +\-0.03%.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |       \/R
          |       R4202/R
          --------------------------------/E
L T DMM200K/R
/F2 /R/R/R/R/R/R/R
CONNECT A 150-190 kOHM STANDARD TO THE INPUT./R
ADJUST R4301 TO MATCH THE READING TO THE STANDARD, +\-0.03%.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O/R
          |          \/R
          |          R4301/R
          --------------------------------/E
L T DMM2MEG/R
/F2 /R/R/R/R/R/R/R
CONNECT A 1.5-2.0 MEGOHM STANDARD TO THE INPUT./R
ADJUST R4302 TO MATCH THE READING TO THE STANDARD, +\-0.1%.../R/R
          --------------------------------/R
          |/R
          |               O  O  O  O/R
          |  O               O/R
          |/R
          |/R
          |   O  O  O  O <--R4302/R
          |/R
          |/R
          --------------------------------/E
U P /R/R/R
DCX-127 DMM BOARD CALIBRATED./E
U END