Command system EN Function description Set the frequency deviation difference (in Hz) for FM modulation. Argument None Instructions ⚫ The deviation must not exceed the carrier frequency. If the deviation is set to a value that exceeds the carrier frequency (with FM enabled), the instrument will adjust the deviation to the maximum value allowed for that carrier frequency. ⚫ The carrier frequency plus bias must not exceed the maximum frequency of the selected function plus 100 kHz. If the deviation is set to an invalid value, the instrument will adjust it to the maximum value allowed by the current carrier frequency.
⚫ If the deviation would cause the carrier waveform to exceed the frequency limit of the current duty cycle (square wave only), the instrument will adjust the duty cycle to ⚫ If the External modulation source is selected, the deviation is controlled by the ± 5 V the maximum value allowed for the current carrier frequency. signal level of the MOD connector on the front panel. For example, if the frequency deviation is 100 kHz, a +5 V signal level is equivalent to a 100 kHz increase in frequency. A lower external signal level produces less deviation, and a negative signal level reduces the frequency below the carrier frequency. The frequency deviation should meet the following conditions:
Frequency deviation ≤ carrier frequency. Frequency deviation + carrier frequency ≤ the upper limit of current carrier frequency + 1 kHz Return format Return as a scientific count. Example SOURce1:MOD:FM:DEViation 900 /* set the frequency offset of channel 1 to 900Hz */ 3.10.2 SOURce :MOD:FM:INTernal:FREQuency Command format SOURce :MOD:FM:INTernal:FREQuency |MINimum|MAXimum SOURce :MOD:FM:INTernal:FREQuency? [MINimum|MAXimum] Function description Set the frequency of the modulated waveform. The modulated source waveform HDG300C Programming manual Copyright © Qingdao Hantek Electronics Co., LTD 30