Instruction manual

94
(Measured phase C power) C PRG ENT
4.3.5. REMOTE MEASUREMENT CALIBRATION
The measurement function of the AC Power System may be remotely calibrated. The equipment
hookup is the same as before except an IEEE-488 Controller must be used to program the AC
Power System. The values for the VLT, CUR and PWR strings must be derived from the external
AC Digital Voltmeters and Current Transformer.
To calibrate the measured voltage, first program the AC Power System to 135.0 volts and 60 Hz.
Send the following calibration string:
CAL VLT (1) (Desired voltage value for phase (1))
To calibrate the measured current send the following string:
CAL CUR (1) (Desired current value for phase (1))
To calibrate the measured power value send the following string:
CAL PWR (1) (Desired power value for phase (1))
NOTE: (1) May be blank or include an A, B or C extension.
4.3.6. REMOTE OUTPUT VOLTAGE CALIBRATION
The ASCII # symbol can be used with a remote calibration to greatly reduce the calibration time.
The ASCII # is used in place of a calibration coefficiennt to begin the CAL ramp to start at the
existing CAL coefficient and ramp up or down for a VAL argument of 255 or 0 respectively.
The following string will cause the CAL coefficient to ramp down with a delay of .2 seconds per
step:
CAL # DLY.2 VAL0
Figure 4-4 is a flow diagram of the Remote Calibration program.