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* Eight digit display provides up to 0.1 Hz resolution * Period mode provides greater accuracy at low frequencies * Ratio mode combines two input frequencies and displays their ratio * Totalize mode and Time interval mode add versatility * Selectable attenuators and low-pass filter prevent miscounts due to input noise Frequency, Totalize, Period, Time Interval, Ratio 50kHz to 175MHz, 50MHz to 175MHz sinewave +-1 count +- 1 time base error Manual reset and hold from the front panel START/STOP jack is low 100 mV rms, 125 MHz to 150 MHz 150 mV rms, 150 MHz to 175 MHz 100 kHz, -3 dB switch selectable Less 1 ppm with +- 10% line volt variation +- 1 ppm (from 0 0 C to 28 0 C) 0 0 C to 50 0 C ambient, +-0.5ppm from 18 0C to 28 0C 0.56'' seven segment LED - 8 digits For kHz, MHz, usSEC, Gate, and overflow indicators Instruction Manual, all models; AC adapter for model 1803D AT-21 antenna kit, PR-37A x1/x10/REF. Probe |