Device for and method of frequency testing printed circuit board under thermal stress

A method of determining acceptability of at least one printed circuit board (PCB), comprising:

• establishing a temperature of the at least one PCB by a temperature chamber comprising:
• at least one slot to accommodate at least one PCB test coupon, wherein the at least one PCB test coupon is fabricated with, and separated from, the at least one PCB;
• an input bus connected to inputs of the at least one slot;
• and
• an output bus connected to outputs of the at least one slot;
• providing at least one signal to the input bus of the at least one slot by a signal generator comprising an output bus;
• measuring the output bus of the at least one slot by a frequency meter comprising an input bus connected to the output bus of the at least one slot and an output bus;
• comparing corresponding outputs of the output bus of the signal generator and the output bus of the frequency meter by a comparator;
• and
• determining acceptability of the at least one PCB fabricated with, and separated from, the at least one PCB test coupon based on the comparison of the comparator.