Omega Engineering CYD201 and CYD208 manual Current Source Calibration, Recalibration

OMEGA Model CYD201/CYD208 User’s Manual

5.7RECALIBRATION

OMEGA calibrates and certifies thermometers to original factory specifications for a reasonable fee. You can recalibrate the thermometer to original specifications, but OMEGA will not warrant these calibrations.

Recalibration requires a digital voltmeter (DVM) with 4½ digit resolution or better; and 25 k￿and 125 k￿precision resistors with ±0.01% tolerance or better.

Recalibration involves current source and analog/digital (A/D) converter calibration. A/D calibration erases all SoftCal™ compensations; perform it after current source calibration, not before.

5.7.1Current Source Calibration

1.Allow 30 minute warm-up to achieve rated specifications.

2.Configure 125 k￿resistor as shown in Figure 5-4. Set Model CYD208 to channel 1.

3.Connect DVM voltage leads across the resistor and adjust the I ADJ trimpot (located on rear panel) until DVM displays a voltage of 1.2500 volts ±100 microvolts.

4.Remove DVM and resistor.

Model CYD201 Model CYD208

NOTE: Do not use a voltmeter for A/D Converter Calibration.

Figure 5-4. Calibration Connections

Service 5-5