Please allow me to add my comments here as well:
The basis of the lab report will, of course, list the items for which you are testing. Voltage, power, amplitudes, etc. This is dependent upon the reason for your test. These are for your advertised specs.
However, other items which are common to list on your report are Date, Time, Relative Humidity, Barometric Pressure, and Temperature. Also, list the serial numbers and models of all equipment used in the testing and the calibration date of the equipment. These are items you will always find on a calibration report for equipment sent to National Standards labs. With this information, you will be able to duplicate the test procedures with the same parameters as the original test. These parameters will be found on all test certificates which adhere to the ASTM, JIS, NIST, MIL, or ISO standards.
MP