# VBScript Calculator Index

These calculators are written in VBScript and will function in Internet Explorer up to version 11. Further information is available in About our calculators

A larger range of calculators is available in Java Script at Calculator Index

Characteristic Impedance Calculator for the Measurement of PCB
Tracks and Coaxial Cables Using a Vector Network Analyser

An active calculator which computes Delay, Velocity Factor, Effective Dielectric Constant and Characteristic Impedance of a PCB track.

Circular Capacitor Calculator

Active calculator for a parallel plate, circular capacitor, showing the formula by Kirchhoff.

Microstrip Characteristic Impedance Calculator Using a Formula by Brian C
Wadell

An active calculator based on a formula by Brian C. Wadell. Used for calculating the Zo of PCB transmission lines, showing the formula used.

Microstrip Characteristic Impedance Calculator

Active calculator using a formula from an article by Rick Hartley, showing the formula used.

Microstrip Characteristic Impedance Calculator Using The
IPC-2141 Formula

Active calculator using a formula from an article by Polar instruments, showing the formula used.

PCB Sample Size Calculator for Relative Dielectric Constant Measurements

An active calculator which selects the optimum size for a circular plane on a PCB. This is used for making relative dielectric constant measurements
using a Vector Network Analyser.

Pi Attenuator Calculator

Active calculator for resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator.

Relative Dielectric Constant Calculator for a Circular Capacitor

Active calculator based on a formula by Kirchhoff for a circular capacitor, showing the equations used.

Resonance Calculator

Active calculator for a capacitor / inductor tank circuit, showing the formula used.

RF Trap With Attenuators

Active calculator with attenuation, return loss, reflection coefficient and VSWR . This calculator is specific to the circuit used in the RF Trap With
Attenuators FLEXI-BOX.

Spreadsheet

An Excel spreadsheet with many simple calculations in 'blocks' that can be built up into fairly complex calculations by simply making the input cell
of any block equal to the result of any other block. There are no locks on any of the cells and this spreadsheet could make good raw material for
building your own personal version.

T Attenuator Calculator

Active calculator for resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator.

These calculators are provided free by Chemandy Electronics in order to promote the FLEXI-BOX