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10 result(s) found where the letter starting with "H"

Harmonic distortion
The levels of harmonic distortion are measured with respect to the fundamental signal and are specified in dB
 

Harmonics
A frequency is harmonic if it is an integer multiple of the fundamental frequency. The fundamental is the first harmonic (although it's generally referred to as the fundamental). The second harmonic is two times the frequency of the fundamental, the third harmonics is three times the fundamental, and so on. So with a fundamental of 100 Hz, the second harmonic is 200 Hz, the third is 300 Hz, the fourth is 400 Hz, etc
 

HCMOS
An output signal format defined as a rectangular wave capable of driving a multiple of CMOS loads. It has a positive signal peak greater than 90% of the supply voltage and a negative signal peak less than 10% of the supply voltage. The number of loads must be specified. Note that the "H" in HCMOS stands for high speed and does not affect the output voltage specification
 

HOLD OVER
To maintain time alignement if disconnected from the external source
 

HPFRS
High Performance Frequency Rubidium Standard
 

HSO
High Stability Oscillator
 

HTML
HyperText Markup Language
 

HTTP
HyperText Transfer Protocol
 

Hysteresis

When applied to a crystal oscillator, this refers to the difference in frequency at a given temperature or control voltage depending on how the set of conditions was approached. For example, as temperature increases to 25° C the frequency will be different than as the temperature decreases to 25°C. Hysteresis is expressed as ± 1/2 the frequency difference divided by the nominal: if the difference is 0.5 Hz and the frequency at 25°C is 10.000000 MHz then the hysteresis is ±2.5 x 10-8
 

Hz
Hertz