User`s manual

76
MAINTENANCE
9. Calibration
9.1 CLOSED-BOX CALIBRATION
The DSP6001 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.
9.2 CALIBRATION SCHEDULE
Calibrate the DSP6001:
• Afteranyrepairsareperformed.
• Atleastonceayear;morefrequentlytoensurerequiredaccuracy.
9.3 BASIC CALIBRATION PROCESS
The basic calibration process consists of four procedures which must be performed in the following
order:
1. Initial Calibration Procedure
2. TSC1 Offset and Gain
3. TSC2 Offset and Gain
4. DAC Output Offset and Gain
5. Speed Check
6. Decimal Point Check
Items needed for calibrating the DSP6001:
• Externalvoltagereferenceof0to5voltsDC
• Digitalmultimeter(DMM)
Both instruments should have a VDC accuracy of 0.05% or better.
9.3.1 initiaL CaLiBration proCeDUre
1. Allow the DSP6001 to stabilize in an environment with:
 • Anambienttemperatureof18°Cto25°C.
 • Relativehumiditylessthan80%.
2. Turn on the DSP6001.
3. Allow the DSP6001 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  buttons simultaneously.
 • TurninstrumentpowerON.
• ContinuepressingtheUP and DOWN  buttons until the display shows the software
revision date then release.
The front panel displays the actual correction factors above the ZERO and GAIN readouts (see
Figure 9–1 Calibration Display Analog Inputs).