Zero Coefficient Adjustment

back to the original displayed value upon restarting. Place the Model 2002 back in the RUN mode to store all of the current calibration coefficients in permanent memory.

To perform a full calibration on the Model 2002 system, first use the Zero Coefficient Adjust- ment Procedure. Followed by the Midrange Coefficient Adjustment Procedure, and finally perform the Atmosphere Coefficient Adjustment Procedure.

The zero coefficient corrects for the constant power level which is present over the entire pressure range. Typically, this adjustment corrects for low pressure errors. The instrument will need to be re-zeroed often if measurements are being made in the 10-4Torr range, especially if the ambient temperature changes. The transducer may have a temperature coefficient of up to 2x10-4Torr/oC. The instrument remote zero input will allow an external gauge such as an ion gauge to automati- cally re-zero the Model 2002 whenever the pressure drops below the desired pressure level (if it has a TTL output).

NOTE: Do not attempt to zero the Model 2002 in pressures above 10-2Torr; the micro- processor will not accept a zero above this pressure.

To manually adjust the zero use the following procedure:

1.If possible, evacuate the vacuum system into the low 10-6Torr (1.33x10-6mbar) range or as low as possible below 10-4Torr.

2.Allow the sensor to operate in this condition for a minimum of 15 minutes.

3.Place the instrument in the CAL mode, then simultaneously press the UP and DOWN

switches	to bypass the interlock. The CAL light will start to flash indicating
that the calibration mode	has been activated.

4.Press the ZERO switch once if below 6x10-5Torr otherwise use the UP and DOWN switch

to	adjust the display of the Model 2002 to match the pressure indicated by
the reference. If using		the UP and DOWN switch to adjust the display, wait 20
seconds between presses at very low		pressure to allow the adjustment to take
affect the data to settle.

5.The unit is now fully zeroed. Place the Model 2002 back in the RUN mode to store the zero

in	permanent memory.

Midrange Coefficient Adjustment

The midrange coefficient corrects for errors in the slope of the power curve of the thin film Pirani. Typically, this is due to the geometry of a particular sensor and will only need to be performed once in the lifetime of the sensor. This adjustment might be needed if a full calibration is being performed in a gas other than nitrogen. The zero adjustment will need to be performed before making this adjustment.

To adjust the midrange coefficient use the following procedure:

1.Evacuate the vacuum chamber and refill with the desired gas to a pressure of 7 Torr, as indicated by a reference vacuum gauge.

2.Press the MODE switch repeatedly until the CAL mode is illuminated.

3.Simultaneously, press both the UP and DOWN switches. The CAL light will start to flash, signalling that the calibration can now be conducted.

4.Press, hold and release the UP and DOWN switches as necessary to adjust the display to match the pressure indicated by the reference. Note: It may be necessary to hold the

desired

switch down for a few seconds before any movement is seen.

Model 2002 page 13

2002 specifications

Teledyne 2002 represents a significant advancement in the realm of sophisticated instrumentation and systems used across various industries. This innovative platform emerged as a versatile solution for a multitude of applications including environmental monitoring, industrial automation, and scientific research.

One of the most notable features of the Teledyne 2002 is its robust data analysis capability. Equipped with powerful processing units, it allows users to conduct real-time data analysis, ensuring accurate and timely results. This is particularly beneficial in fields where immediate decision-making is crucial, such as environmental assessments and industrial quality control.

The technology behind the Teledyne 2002 encompasses a variety of sensors and analytical instruments. Its modular design enables users to customize the system according to their specific needs, integrating various sensors such as gas analyzers, spectrometers, and temperature sensors. This flexibility makes the Teledyne 2002 applicable in diverse settings, from laboratory environments to rugged field conditions.

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Overall, the Teledyne 2002 symbolizes a convergence of advanced technology, user-centric design, and robust performance. With its extensive features and versatility, it stands out as a premier solution for professionals demanding precision and reliability in their analytical endeavors. Whether for environmental monitoring or industrial applications, the Teledyne 2002 is equipped to meet the challenges of modern data analysis.