This page answers frequently asked questions about Computer Aided
Resonator Design (CARD).
|Is CARD available in any language other than English? No.
All menus and on-line help are in English only.|
|Can CARD analyze resonators that vibrate in flexure (bending),
radial, or torsional modes? Generally, CARD cannot analyze flexural, radial, or
torsional resonators that have an arbitrary shape; CARD can only analyze resonators that
vibrate longitudinally (parallel to the axis of the resonator). However, CARD has an Equations section that allows some
calculations for simple flexural, radial, and torsional resonators (beams, plates,
disks, rings). These simple resonators are those that can be described by classic
differential equations. |
|Can CARD analyze transducers (converters)? Yes. CARD can
determine the longitudinal resonant frequency and the relative stresses,
amplitudes, and losses (with the same accuracy and limitations as with any other resonator
analysis). CARD works best for relatively slender transducers, such as handheld
transducers used in medical applications. CARD is not well suited for analyzing
"fat" transducers (e.g., those used for cleaning tanks).|
Note: CARD cannot currently determine the actual output amplitude for a specified
electrical input, since CARD does not have the piezoelectric transformations. This
capability may be included in a future release if there is sufficient demand.
|Can CARD determine higher harmonic resonances? Yes. This
works well for relatively slender resonators. As the frequency of the harmonic resonance
increases (i.e., the resonator becomes fatter in relation to the half wavelength), the
|Will CARD run on an Apple computer? No. CARD will only run
on an IBM-compatible computer. The operating system must be either Windows or DOS. For
other equipment requirements, click here.|
|I receive the following error message when attempting to start
CARD: "The copy protection key must be plugged into the printer port" (or
similar). CARD has failed to recognize the copy protection key. Try each of the
following, in turn:|
a. Make sure the copy protection key is plugged into the parallel printer port, not the
b. If a printer is attached to the copy protection key, make sure it is turned on and
ready to print. (Try printing a page from another application, such as a word processor.)
c. Turn the printer off and disconnect the printer cable from the copy protection key. If
this corrects the problem, then the printer is probably interfering with the copy
protection key. This is especially likely if the printer is a Hewlett-Packard with
bi-directional capabilities. To resolve this problem:
i. Install HP's newest drivers.
ii. If the newest drivers don't solve the problem, then install a second
printer port that is dedicated solely to the copy protection key. This is relatively easy
and should cost about $20.
iii. Use a different printer.
d. Turn the printer off and disconnect the printer cable from the copy protection key. Run
Keshow.exe. This will show the status of the copy protection key.
|Can CARD be used on multiple computers? Yes. However, CARD
can only be used on the computer that has the copy protection key attached. If you want to
use CARD on another computer, then you must transfer the copy protection key to that
|Will CARD operate on a networked computer? Yes. However,
the user must run CARD from the computer where CARD has been installed and where the copy
protection key is attached. Also, although CARD may print satisfactorily to a networked
printer, this will depend on the particular network and is, therefore, not guaranteed. For
additional information, see CARD's online help at <Alt+H>\Setup and starting
procedures\Printer setup\Printing on a network\.|
|Is CARD Y2K compliant? Yes. CARD does not use any function
that manipulates or depends on the date.|
|How should CARD be uninstalled? If you find that CARD does
not meet your requirements, then you can simply delete the directory (folder) in which
CARD has been installed. (Note: since CARD is not a Windows program, it would not have
made any changes to the Windows' Registry.)|
|After I machine a resonator, the tuned length (or frequency or
gain) is not the same as predicted by CARD. Card gives approximate results based on
a one-dimensional analysis. These results are intended to assist with design, not to give
absolutely correct values. (See method
of analysis. Also see chapter 6 "Impedance Matching" in the CARD manual.)
Where CARD's internal accuracy is not sufficient, a calibration mode has been provided.|
|How can I print CARD's graphics? See CARD's online help at
<Alt+H>\Setup and starting procedures\Printer setup\. Then select either
"Printing graphics under DOS" or "Printing graphics under Microsoft
|How do I replace the battery in the copy protection key?
The copy protection key has a button that contains two components:|
a. the copy protection integrated circuit.
b. a ten-year battery.
It is unlikely that the battery will ever need to be replaced. If required, the button can
only be replaced by Krell Engineering.
|What should I do if the copy protection key becomes damaged?
Contact Krell Engineering. If required, the key will be repaired or exchanged for a fee.|
|What should I do if the copy protection key is lost? The
copy protection key is an indicator of authorized use. Therefore, if you lose the copy
protection key, you must purchase an entire CARD.||