107MAINTENANCE9. Calibration9.1 Closed-box CalibrationThe DSP7000 features closed-box calibration. The advantage of closed-box calibration is that theuser does not have to disassemble the case or make mechanical adjustments.9.2 Calibration sCheduleCalibrate the DSP7000:• After any repairs are performed.• At least once a year; more frequently to ensure required accuracy.9.3 basiC Calibration proCessThe basic calibration process consists of procedures which must be performed in the following order:(Depending on your hardware configuration some steps may not apply)1. Initial Calibration Procedure (re initializes unit to default values)2. TSC1 A/D offset and gain3. TSC1 D/A offset and gain4. TSC2 A/D offset and gain5. TSC2 D/A offset and gain6. Io Card 1 Channel 1 A/D offset and gain7. Io Card 1 Channel 2 A/D offset and gain8. Io Card 1 Channel 1 D/A offset and gain9. Io Card 1 Channel 2 D/A offset and gain10. Io Card 2 Channel 1 A/D offset and gain11. Io Card 2 Channel 2 A/D offset and gain12. Io Card 2 Channel 1 D/A offset and gain13. Io Card 2 Channel 2 D/A offset and gain14. Speed Check15. Decimal Point CheckItems needed for calibrating the DSP7000:• External voltage reference of 0 to 10 volts DC• Digital multimeter (DMM)both instruments should have a VDC accuracy of 0.05% or better.9.3.1 iniTial CaliBraTion proCeDure1. Allow the DSP7000 to stabilize in an environment with:• An ambient temperature of 18°C to 25°C.• Relative humidity less than 80%.• Power Resistor 250 ohms 50W.
