The simplest way to calibrate the time scale of the spectrum recorded on the multichannel analyzer is to insert cable delays of known length between the timing discriminator output and the TAC input. The additional delay will shift the peak in the time spectrum. The amount of shift can be calibrated against the known value for the inserted delay. The Model 425A Nanosecond Delay is a convenient source of adjustable delays for this purpose.

For higher accuracy in calibrating the time scale, the Model 462 Time Calibrator is the better choice. This unit uses an accurate digital clock to produce stop pulses at precisely spaced intervals after a start pulse. A short data acquisition with the Model 462 connected to the TAC inputs results in multiple peaks in the spectrum. The spacing between these peaks corresponds to the period selected by the controls on the Model 462.