21
MAINTENANCE
6. Calibration
6.1
Closed-box Calibration
The 6200 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 values for the zERo and gAIN correction factors. Record these
values before calibration. In the unlikely event of a Controller/Readout failure, it can re-initialized
by pressing and holding the SToRE and RECALL 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.
6.2
Calibration sChedule
Calibrate the 6200:
• After any repairs are performed.
• At least once a year; more frequently to ensure required accuracy.
6.3
basiC Calibration proCess
The basic calibration process consists of four procedures which must be performed in the following
order:
1. Initial Calibration Procedure
2. Torque offset and gain
3. Speed Verification
4. Accessory Torque output offset and gain
5. Auxiliary Input offset and gain
Items needed for calibrating the 6200:
• External voltage reference of 0 to 5 volts DC
• Digital multimeter (DMM)
• Function generator with square wave, TTL output
both instruments should have a VDC accuracy of 0.05% or better.
6.3.1
i
nitial
C
aliBration
P
roCedure
Note:
Record the actual correction factors displayed before proceeding
with calibration.