Omega Engineering CYD201 Uživatelský manuál stáhnout pdf (Strana 41)

OMEGA Model CYD201/CYD208 User’s Manual

Service 5-5

5.7 RECALIBRATION

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.

5.7.1 Current 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

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 59 60

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Omega Engineering CYD201 Uživatelský manuál Strana 41