1 Merino is one of the softest types of wool available, because of finer fibers and smaller scales.  Merino has an excellent warmth-to-weight ratio compared to other wools, in part because the smaller fibers have microscopic cortices of dead air, trapping body heat similarly to the way a sleeping bag warms its occupant.
Transistorâtransistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors.
The test signal for time measurements is usually a pulse that occurs once per second (1 pps). Thepulse width and polarity varies from device to device, but TTL levels are commonly used. The test signalfor frequency measurements is usually at a frequency of 1 MHz or higher, with 5 or 10 MHz beingcommon.