Entering 299B Capacitors

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The following table describes the part parameters required for capacitors when 299B is the selected calculation model. The 299B model supports all but the following subcategories of capacitors:

• Air Trimmer, Variable (CT)

• Ceramic, Variable (CV) subcategory (299B Parts Stress model only)

• Other Variable (Class, Mica, and Plastic/FEP)

• Vacuum, Variable or Fixed (CG)

While the 299B Parts Stress model does not support the Ceramic, Variable (CV) subcategory the 299B Parts Count model does support this part type. The only parameter required by the 299B Parts Count model is Quality Level.

Parameter

Type

Description

Quality Level

Choice List [Parts Count also]

The appropriate quality screening level of the device. Accepted quality levels and values for capacitors follow. For the quality value assigned to a specific capacitor, see Chinese Standard GJB/z 299B.

• A1L = 0.03

• A1W = 0.10

• A = 0.30

• A2 = 0.30

• B1 = 0.50

• B2 = 1.00

• C = 5.00

• C1 = 3.00

• C2 = 5.00

Plastic Type

Choice List

Required only for the Plastic (CFR) subcategory.

The type of plastic from which the device is made. Choices are:

• Polypropolene, PTFE

• Terylene, Polystyrene

Capacitance

Real

The capacitance value of the device. This parameter is used in conjunction with Units to enter the capacitance value.

Units

Choice List

The units for the Capacitance value. Choices are:

• F (Farad)

• uF (micro Farad = F/1E6)

• nF (nano Farad = F/1E9)

• pF (pico Farad = F/1E12)

Class Level

Choice List [Parts Count also]

Required only for the following subcategories: Chip, Ceramic (CDR); General Ceramic (CK, CKR); and Temp Compensat, Ceramic (CC, CCR).

The class of the device. Choices are:

• 1

• 2

Rated Temperature

Choice List

Required only for the following subcategories: Button Mica (CB); Feed Through, Paper (CZ, CZR); Paper (CA, CP); Paper-Plastic (CQ, CQR, CPV); Metallized Paper-Plastic (CH, CHR); Plastic (CFR); Mica (CM, CMR); and Super Metallized Plastic (CRH). Also required for the following subcategories when the class level is 2: Chip, Ceramic (CDR); General Ceramic (CK, CKR); and Temp Compensat, Ceramic (CC, CCR).

The rated temperature of the device in degrees C.

Series Resistance

Real

Required only for the following subcategories: Chip, Elec (CWR) and Solid, Elec, Tant (CSR).

The circuit resistance of the device.

[Voltage Parameters]

Real (Watts)

For more information, see Voltage Parameters.

The 299B model was updated in Relex 2006. For capacitors, voltage parameters are now used instead of power parameters. If a value was entered for Power Ratio in a version prior to Relex 2006 v2, this value is shown for Voltage Ratio. Any values that were formerly entered for Voltage Rated and Voltage Applied for calculating the voltage ratio are dropped.

[Temperature Parameters)

Real (Degrees C)

For more information, see Basic Temperature Parameters.

[Derating Parameters]

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For more information, see Derating Parameters.