PROCEDUREv2.10
U P /R
             ***** DSP MODULE ADJUSTMENT PROCEDURE *****/R/R
            Copyright (C) 1991, 1992 Audio Precision Inc./R/R/R/R/R
THE DSP MODULE IS LOCATED IN THE LOWER LEFT COMPARTMENT./R
A 100 MHz GENERAL PURPOSE OSCILLOSCOPE IS REQUIRED FOR CALIBRATION./R
/R/R
-------------------------------------------------------------------------/R
| NOTE:  There have been two versions of this board (DSP-1 and DSP-2).  |/R
|        This procedure is valid for both versions.                     |/R 
-------------------------------------------------------------------------/R
/R/R/R/R/R
PRESS <Enter> TO CONTINUE, <F1> TO ABORT.../E
U P /R/R/R/R/R/R/R/R
CONNECT AN OSCILLOSCOPE TO TP8604 AND OBTAIN A STABLE DISPLAY./R
ADJUST R8402 FOR A 50% DUTY CYCLE.../R/R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O             O/R
  |/R
  |/R
  |                O/R
  |/R
  |                O/R
  |                    R8402--> O       +++ <--TP8604/R
  ----------------------------------------------------------------/E
U P /R
                 EEPROM CALIBRATION CONSTANTS/R/R/R
Five software calibration constants are stored in non-volatile memory on/R
the DSP module.  These are initialized at the factory, but may require/R
recalibration if the A\D or D\A converters have been repaired./R/R/R
Press <1> to change A\D gain constants.../R/R
Press <2> to change A\D offset constants.../R/R
Press <3> to change D\A gain constant.../R/R
Press <9> to change all constants.../R/R
Press <Enter> to proceed without changing EEPROM constants.../C10/E
IF 1[R CALL AD-CAL.PRS/RR P]
IF 2[R CALL AD-OFF.PRS/RR P]
IF 3[R CALL DA-CAL.PRS/RR P]
IF 9[R CALL AD-CAL.PRS/R
R CALL AD-OFF.PRS/R
R CALL DA-CAL.PRS/R]
L T DAC-TRIM/R/E
U P /R/R/R/R
CONNECT DSP OUTPUT D\A TO ANALYZER CHANNEL A INPUT FOR THE NEXT 2 STEPS./R
/R/R/R/R
ADJUST R2305 FOR BEST LINEARITY ON THE NEXT GRAPH.../R/R/R
  ----------------------------------------------------------------/R
  |                R2305--> O/R
  |        O             O/R
  |/R
  |/R
  |                O/R
  |/R
  |                O/R
  |                             O/R
  ----------------------------------------------------------------/E
/F4/E
P DO+++/R/A9/E
U P /R/R/R/R/R/R/R/R/R
ADJUST R2306 FOR BEST LINEARITY ON THE NEXT GRAPH.../R/R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O    R2306--> O/R
  |/R
  |/R
  |                O/R
  |/R
  |                O/R
  |                             O/R
  ----------------------------------------------------------------/E
P DO+++/R/A9/E
L T AD-ADJ/R
P DS+/R+/R
/F2 /R/R/R/R/R/R/R
ADJUST R7204 FOR MINIMUM THD+N.../R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O             O/R
  |/R
  |/R
  |                O/R
  |/R
  |       R7204--> O/R
  |                             O/R
  ----------------------------------------------------------------/E
P DS+/R
/F2 /R/R/R/R/R/R/R
ADJUST R5204 FOR MINIMUM THD+N.../R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O             O/R
  |/R
  |/R
  |       R5204--> O/R
  |/R
  |                O/R
  |                             O/R
  ----------------------------------------------------------------/E
L T ADTWEEK/R
U P /R/R/R/R/R/R
ADJUST R7204 FOR EQUAL 12 kHz AND 20 kHz HARMONICS ON THE NEXT GRAPH.../R/R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O             O/R
  |/R
  |/R
  |                O/R
  |/R
  |       R7204--> O/R
  |                             O/R
  ----------------------------------------------------------------/E
/A9/E
P S1+/R/E
U P /R/R/R/R/R/R
ADJUST R5204 FOR EQUAL 12 kHz AND 20 kHz HARMONICS ON THE NEXT GRAPH.../R/R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O             O/R
  |/R
  |/R
  |       R5204--> O/R
  |/R
  |                O/R
  |                             O/R
  ----------------------------------------------------------------/E
/A9/E
L T PHASETWK/R
U P /R/R/R/R/R/R
ADJUST R3201 FOR MINIMUM TRACE SEPARATION ON THE NEXT GRAPH.../R/R/R
  ----------------------------------------------------------------/R
  |                         O/R
  |        O <--R3201    O/R
  |/R
  |/R
  |                O/R
  |/R
  |                O/R
  |                             O/R
  ----------------------------------------------------------------/E
/A9/E
/F1/E
U P/R/R/R
DSP MODULE CALIBRATED./E
U END