Tolerance Operands
A tolerance operand has a four letter mnemonic, such as TRAD for Tolerance Radius. Three integer values, abbreviated Int1, Int2, and Int3, are associated with the mnemonic to identify the surface or surfaces of the lens to which the tolerance applies. Some tolerance operands use the Int numbers for purposes other than defining surface numbers as indicated in the following table.
Each tolerance operand also has a minimum and maximum value. These values refer to the maximum acceptable change from the nominal value. Each operand also has space for an optional comment to make the tolerance set easier to read. The available tolerance operands are listed in the following table, and are described in detail below.
Summary of Tolerance Operands
ISOA Tolerance on peak-to-valley power
ISOB Tolerance on total peak-to-valley irregularity
ISOC Peak-to-valley rotationally symmetric irregularity (RSI)
ISOD RMS total irregularity
TRAD Tolerance on surface radius of curvature in lens units
TCUR Tolerance on surface curvature in inverse lens units
TFRN Tolerance on surface radius of curvature in fringes
TTHI Tolerance on thickness or position in lens units
TCON Tolerance on conic constant (dimensionless)
TSDI Tolerance on clear semi-diameter or semi-diameter in lens units
TSDR Tolerance on Standard surface radial decenter in lens units
TSDX Tolerance on Standard surface x-decenter in lens units
TSDY Tolerance on Standard surface y-decenter in lens units
TSTX Tolerance on Standard surface tilt x in degrees
TSTY Tolerance on Standard surface tilt y in degrees
TIRX Tolerance on Standard surface tilt in x in lens units
TIRY Tolerance on Standard surface tilt in y in lens units
TIRR Tolerance on Standard surface irregularity
TEXI Tolerance on surface irregularity using Zernike Fringe polynomials
TEZI Tolerance on surface irregularity using Zernike Standard polynomials
TPAI Tolerance on the inverse of parameter value of surface
TPAR Tolerance on parameter value of surface
TIND Tolerance on index of refraction of surface
TABB Tolerance on Abbe number of surface
TCMU Tolerance on coating multiplier of surface
TCIO Tolerance on coating index offset of surface
TCEO Tolerance on coating extinction offset of surface
TEDR Tolerance on element radial decenter in lens units
TEDX Tolerance on element x-decenter in lens units
TEDY Tolerance on element y-decenter in lens units
TETX Tolerance on element tilt about x in degrees
TETY Tolerance on element tilt about y in degrees
TETZ Tolerance on element tilt about z in degrees
TARR Tolerance on radial roll angle in degrees
TARX Tolerance on roll angle in x in degrees
TARY Tolerance on roll angle in y in degrees
TRLR Tolerance on radial roll (TIR) in lens units
TRLX Tolerance on roll (TIR) in x in lens units
TRLY Tolerance on roll (TIR) in y in lens units
TUDX Tolerance on user defined x-decenter in lens units
TUDY Tolerance on user defined y-decenter in lens units
TUTX Tolerance on user defined tilt about x in degrees
TUTY Tolerance on user defined tilt about y in degrees
TUTZ Tolerance on user defined tilt about z in degrees
TNPS Tolerance on NSC object position.
TNPA Tolerance on an NSC object parameter data
TMCO Tolerance on multi-configuration editor value
CEDV Sets an extra data value as a compensator. CEDV is deprecated and has been replaced by CPAR.
CMCO Sets a multi-configuration value as a compensator
COMM This operand is used to print a comment in the tolerance analysis output report
COMP Sets a thickness, radius or conic compensator.
CPAR Sets a parameter as a compensator
SAVE Saves the file used to evaluate the tolerance on the prior row in the editor
SEED Seeds the random number generator for MC analysis. Choose 0 for random.
STAT Defines statstics used 'on the fly' during Monte Carlo analysis
TWAV Sets the test wavelength for operands measured in fringes
For a complete description of tolerance operands, see the following sections.
Next:
- Tolerance Operands Summary Table
- ISOA: Tolerance on peak-to-peak power
- ISOB: Tolerance on total peak-to-valley irregularity
- ISOC: Tolerance on peak-to-valley rotationally symmetric irregularity (RSI)
- ISOD: Tolerance on RMS total irregularity
- TRAD: Tolerance on Radius
- TCUR: Tolerance on Curvature
- TFRN: Tolerance on Fringes
- TTHI: Tolerance on Thickness
- TCON: Tolerance on Conic
- TSDI: Tolerance on Clear Semi-Diameter or Semi-Diameter
- TSDX, TSDY, TSDR: Tolerance on Surface Decenters
- TSTX, TSTY: Tolerance on Surface Tilts
- TIRX, TIRY: Tolerance on Surface TIR
- TIRR: Tolerance on Surface Irregularity
- TEXI: Tolerance on Surface Irregularity Using the Fringe Zernike Model
- TEZI: Tolerance on Surface Irregularity Using the Standard Zernike Model
- TPAI: Tolerance on the Inverse of Parameter Data
- TPAR: Tolerance on Parameter Data
- TIND: Tolerance on Index
- TABB: Tolerance on Abbe
- TCMU: Tolerance on Coating Multiplier
- TCIO: Tolerance on Coating Index Offset
- TCEO: Tolerance on Coating Extinction Offset
- TEDX, TEDY, TEDR: Tolerance on Element Decenters
- TETX, TETY, TETZ: Tolerance on Element Tilts
- TARX, TARY, TARR: Tolerance on Roll Angles
- TRLX, TRLY, TRLR: Tolerance on Roll TIR
- TOFF: Tolerance Off (can be used for comments)
- TUDX, TUDY, TUTX, TUTY, TUTZ: Tolerance on User Defined Tilts & Decenters
- TNPS, TNPA, TNMA: Tolerances on Non-sequential Data
- TMCO: Tolerance on Multi-Configuration Data