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The PM6666 and PM6669 are economical, easy-to-use counters that meet the demands for high-precision measurements, reliability and durability. The units use reciprocal frequency counting, which yields high resolution measuring results under all conditions, even on low frequency measurements. The high performance Counter frontends, providing variable sensitivity and noise immunity increase measuring accuracy. Accuracy can be further improved with the optional high stability MTCXO TimeBase, that offers a stability of 2 x 10-7 (0°C to 50°C), comparable to that of an oven stabilized Oscillator. The counters have high input protection, allowing it to withstand inputs of 12V rms on the optional 50½ RF input and 350V (dc+ac peak) on the 1 M½ LF input. PM 6666 Programmable Timer/ Counter The PM 6666 is a low cost timer/counter with high accuracy frequency, time and voltage measurements that also offers 100% programmability including trigger level and sensitivity settings. A bus learn mode is provided to speed and simplify programming. The PM 6666 is also a bench-top use; with 9 front panel selectable measuring functions including voltage max. /min. measurements.