Instrument Function > Modulation > Overview of Modulation > Modulation Sources > External Modulation Sources
External Modulation Sources

The modulation input MOD EXT at instrument front provides the external modulation sources for amplitude, frequency and phase modulation.

The external modulation signal for AM, FM and PM at the input must have a voltage of US = 1 V (UEFF = 0.707 V) in order to achieve the displayed modulation depth and range. The input voltage should not exceed 1 V, otherwise modulation distortions might occur.

The maximum modulation frequency is 100 kHz for frequency and phase modulation, and 50 kHz for amplitude modulation.

The PULSE EXT/INST TRIG connector at the rear of the instrument controls the external pulse modulation. The input shows some hysteresis with threshold levels of 0.5 V/1.5 V. The voltage must not exceed 10 V.

 


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