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6.1
CLOSED-BOX CALIBRATION
The 3410 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.
The torque readout 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.
6.2
CALIBRATION SCHEDULE
Calibrate the 3410:
•
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 two procedures which must be performed in the following
order:
1. Initial Procedure
2. Torque Offset and Gain (computer)
3. Frequency Gain (Note: this is available on Software revision L1 forward)
Items needed for calibrating the 3410:
•
External voltage reference of 0 to 10 volts DC
•
Digital multimeter (DMM)
•
Frequency generator capable of generating a square wave 0V to 5V
•
Frequency meter capable of a measuring square wave 0V to 5V
Both measuring instruments should have a accuracy of 0.005% or better.
6.3.1
i
c
nitiaL
aLiBration
1. Allow the 3410 to stabilize in an environment with:
•
•
2. Turn on the 3410.
3. Allow the 3410 to warm up for at least 30 minutes.
6.3.2
t
o
orque
1. Send the command CAL to the unit via the serial port.
2. The response will be ZERO.
3. Apply 0.0000 volts to the input.
4. Send the command ZERO.
5. The response will be FS=X.XXXX
6. Calibration
p
roceDure
An ambient temperature of 18°C to 25°C.
Relative humidity less than 80%.
g
ffSet anD
ain
18
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