Jack, The only reason targets are still included in the IPC-D-310, Guidelines for Phototool Generation and Measurement Techniques, is for inspection of size accuracy. Suppliers of phototools should have a quality assurance procedure to verify accuracy of size. This may be an SPC program, or other acceptable method. The receiver of the photo tools also needs a mechanism to verify size accuracy. The targets provide a fixed feature for measuring this accuracy. Targets are not necessary, if an alternate acceptable method is used. The standard also recommends that temperature and humidity be marked on the plot, so that verification of size can be acomplished under the same conditions the film was plotted at. Regards, Gary Ferrari Executive Director IPC Designers Council *************************************************************************** * The mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text.* *************************************************************************** * If you are having a problem with the DesignerCouncil, please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************