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5.4.1 Select PM Modulation
Press [Mod] >Type >PMsoftkey to enable PM function.
When Mod is enabled, Sweep or Burst will be disabled automatically.
After PM is enabled, the instrument will generate PM waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.4.2 Carrier Waveform Shape
PM carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or Harmonic
waveform.
Press[Wave] button on the front panel to select the desired carrier waveform.
Noise and DC could not be used as carrier waveform.
5.4.3 Carrier Waveform Frequency
For different carrier waveforms, the settable range of carrier frequency is different. please refer to
"Frequency Characteristics" in "
Specifications".The default value is 1kHz.
Press [Setting] > Frequency softkey on the front panel, and then use the numeric keypad or
direction keys and knob to input the desired frequency value.
5.4.4 Modulation Source
Press [Mod] > Signal Source softkey to select Internal, External or Another Channel as the
modulation source.
Internal Source
When internal modulation source is selected, press Shape softkey to select Sine, Square, Ramp,
Noise or Arb as the modulation source. The default is Sine.
Sine
Square: 50% duty cycle
Ramp: 50% symmetry.
Noise
Arb: Sinc, Exp Fall, Haver Sine, Lorentz, Gause, Dual Tone, ECG.
Note: Noise can be used as modulating waveform but cannot be used as carrier waveform.
External Source
When external modulation source is selected, the Frequency and Shape menu in the modulation
menu is grayed out and disabled.The instrument receives the external modulation signal from the
[FSK/Trig/Sync/Extmod] connector on the rear panel.At this point, the PM modulation phase
deviation is controlled by the ±4V signal level on the connector.
User Manual 40
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