Frequency deviation can be measured up to a maximum of kHz for modulation frequencies up to kHz. Phase deviation can be measured to a maximum of radians up to ] kHz modulation frequency. Above this frequency the maximum measurable deviation decreases at 6 dB per octave. Useful indications are given for depths up to Measurements of all three types of modulation can be related to any reference level and expressed as dB.
The reference quantity may be entered numerically via the keypad or may be a measurement selected from a series and transferred to store by a single key stroke. The post detector bandwidth may be shaped by any one of five built-in filters which cover the varied requirements cf mobile radio, broadcasting, telemetry etc.
There is also a choice of 3 de-emphasis time constants which may be introduced into the audio output signal in f. They may also be introduced into the measurement system by a keyboard second function. External filters may be introduced into the measurement circuit in addition to and independently of any internal selection. Standards of amplitude and frequency modulation are generated within the instrument for calibration purposes.
For systems use or production tests, up to 10 sets of control settings may be stored in non-volatile memory for subsequent recall and use.
The measurement is based on peak voltage detection and will indicate peak power on amplitude modulated signals. The range may be extended upward by added external attenuation and a flexible system of power calibration with optional display in watts or dBm can be introduced by second functions. In the a. The sensitivity increases considerably towards the bottom end of the frequency range and a substantial further increase can be obtained by reverting to manual tuning.
Deep amplitude modulation may reduce the signal level during troughs to a point that is insufficient to ensure proper functioning of the internal frequency Counter and auto-tuning may be adversely affected. The effect is only likely to occur with a. Frequency deviation can be measured up to a maximum of kHz for modulation frequencies up to kHz.
Phase deviation can be measured to a maximum of radians up to ] kHz modulation frequency. Above this frequency the maximum measurable deviation decreases at 6 dB per octave. Useful indications are given for depths up to Measurements of all three types of modulation can be related to any reference level and expressed as dB. The reference quantity may be entered numerically via the keypad or may be a measurement selected from a series and transferred to store by a single key stroke.
The post detector bandwidth may be shaped by any one of five built-in filters which cover the varied requirements cf mobile radio, broadcasting, telemetry etc. There is also a choice of 3 de-emphasis time constants which may be introduced into the audio output signal in f.
They may also be introduced into the measurement system by a keyboard second function. External filters may be introduced into the measurement circuit in addition to and independently of any internal selection. Standards of amplitude and frequency modulation are generated within the instrument for calibration purposes. When necessary, an external 10 MHz standard may be used in place of the internal reference which forms the basis for local Oscillator frequency synthesis and for frequency measurement.
It is also possible to provide for direct substitution of the local Oscillator signal by a source of external origin. The changeover in both cases being effected by second function keying.
Modulation is normally measured as peak excursions of either the amplitude, frequency or phase of the carrier signal and a choice of detector modes enables the peaks of each polarity either to be measured separately or for their average to be calculated and presented as Two additional detector modes offer 1 an averaging detector, and 2 a PEAK HOLD function. The averaging mode NOISE AVG is useful when noise is to be measured, and the quantity displayed when in this mode is of the peak value of a sine wave having the same average value.
In the a. The sensitivity increases considerably towards the bottom end of the frequency range and a substantial further increase can be obtained by reverting to manual tuning.
Deep amplitude modulation may reduce the signal level during troughs to a point that is insufficient to ensure proper functioning of the internal frequency Counter and auto-tuning may be adversely affected. The effect is only likely to occur with a. Frequency deviation can be measured up to a maximum of kHz for modulation frequencies up to kHz. Phase deviation can be measured to a maximum of radians up to ] kHz modulation frequency. Above this frequency the maximum measurable deviation decreases at 6 dB per octave.
Useful indications are given for depths up to Measurements of all three types of modulation can be related to any reference level and expressed as dB. The reference quantity may be entered numerically via the keypad or may be a measurement selected from a series and transferred to store by a single key stroke. The post detector bandwidth may be shaped by any one of five built-in filters which cover the varied requirements cf mobile radio, broadcasting, telemetry etc.
There is also a choice of 3 de-emphasis time constants which may be introduced into the audio output signal in f. They may also be introduced into the measurement system by a keyboard second function. External filters may be introduced into the measurement circuit in addition to and independently of any internal selection. Standards of amplitude and frequency modulation are generated within the instrument for calibration purposes.
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