Magtrol DSP6000 User Manual - 6 - Calibration
21
CLOSED-BOX CALIBRATION
The DSP6000 features closed-box calibration. The
advantage of closed-box calibration is that the user does
not have to disassemble the case or make mechanical
adjustments. However, the calibration of the Accessory
Torque Output must be done internally with Offset and
Gain trim pots.
The Torque readout and Auxiliary Input can be
calibrated using external reference sources. Correction
factors for Offset and Gain are stored in nonvolatile
memory. They remain in effect until the user or the
calibration house updates them.
The front panel displays the actual correction factors
above the ZERO and GAIN readouts. Record these
values before calibration. In the unlikely event of a
Controller failure, it can re-initialized by pressing and
holding the P, I nad D buttons while turning the power
on. All internal memory and setups will be lost. After
re-initializing, reprogram the GAIN and ZERO values
into memory.
CALIBRATION SCHEDULE
Calibrate your DSP6000:
•
After any repairs are performed
•
At least once a year; more frequently to ensure
required accuracy
BASIC CALIBRATION PROCESS
The basic calibration process consists of four procedures
which must be performed in the following order:
1. Initial Procedure
2. Torque Offset and Gain
3. Accessory Torque Output Offset and Gain
4. Auxiliary Input Offset and Gain
To calibrate the DSP6000, you will need:
•
External voltage reference of 0 to 5 volts DC
•
Digital multimeter (DMM) with VDC accuracy
of 0.05% or better
I
NITIAL
C
ALIBRATION
P
ROCEDURE
NOTE:
Record the actual correction
factors displayed before
proceeding with calibration.
1. Allow the DSP6000 to stabilize in an environment
with:
•
An ambient temperature of 18°C to 25°C
•
Relative humidity less than 80%
2. Turn on the DSP6000.
3. Allow the DSP6000 to warm up for at least 30
minutes.
4. Enable the calibration mode as follows:
•
Turn instrument power OFF
•
Press in and hold the UP ! and DOWN "
arrow buttons simultaneously
•
Turn instrument power ON
5. Continue pressing the UP ! and DOWN
" arrow buttons until the display shows the
software revision date.
6. Press the SHIFT button once.
NOTE:
To exit CALIBRATE mode
without making any changes,
press the SHIFT button six times.
T
ORQUE
O
FFSET
AND
G
AIN
1. Connect the external voltage reference common to
Pin 13 of the dynamometer input connector.
2. Connect the external voltage reference high to Pin
14 of the dynamometer input connector.
3. Apply +2.000 VDC.
4. Press the GAIN button.
5. Adjust the gain by turning the Decrease/Increase
Dial until the displayed voltage equals the reference
voltage.