Symmetry
Pressing the SYMMETRY key sets the edit arrow to the SYMmetry field in the lower line of the
display. The waveform symmetry can be adjusted using the rotary control within the range 15:85
to 85:15 for frequencies below 1MHz. For frequencies above 1MHz the symmetry can still be set
over the same range but the symmetry extremes achievable are typically only 40:60 to 60:40.
Amplitude
Pressing the AMPLITUDE key sets the edit arrow to the AMPlitude field in the lower line of the
display. The amplitude of the MAIN OUT can be adjusted using the rotary control within the
range 1.0Vpp to 20.0Vpp (0dB attenuation). The amplitude display is correctly modified when
20dB or 40dB attenuation is set (see Attenuator Setting section).
Note that greater attenuation can be achieved using standard 50
Ω
BNC attenuators on the
output.
Function
Pressing the FUNCTION key sets the edit arrow to the FUNCtion field in the lower line of the
display. Turning the rotary control steps the output waveform selection through the choices of
SINewave, TRIangle, SQUarewave and DC level.
Configuration Level Control
Pressing the EDIT key once gives the keys the CONFIGuration functions marked directly above
them; the lamp beside the CONFIG functions lights to show that they are selected.
AM/FM
Pressing the AM/FM key sets the edit arrow to the INPUT field in the lower line of the display.
Turning the rotary control steps the setting of the AM/FM input through the choices of OFF, AM,
and FM.
With the setting at OFF, any external signal applied to the AM/FM input will have no effect.
With the setting at FM, a signal applied to the external input will be summed with the internal
control voltage derived from the frequency setting to determine the instantaneous operating
frequency. Care must be taken to choose a signal level and centre frequency which keeps the
maximum frequency deviation within the selected frequency range, see Specification.
With the setting at AM, a signal applied to the external input will be summed with the internal
voltage controlling the unmodulated amplitude to determine the instantaneous output level. Care
must be taken to choose a signal level which keeps the amplitude variation within the range
determined by the attenuator setting, see Specification.
Attenuator Setting
Pressing the ATTN key sets the edit arrow to the ATTN field in the lower line of the display.
Turning the rotary control steps the attenuation setting through the choices of 0dB, 20dB or 40dB.
Note that when 20dB or 40dB attenuation is selected, the output amplitude value shown in the
AMPlitude display is correctly modified.
Saving Programs
Pressing the SAVE key sets the edit arrow to the SAVE PROG field in the lower line of the
display. Turning the rotary control selects which non–voltatile memory, numbered 1 to 30, the
current program is to be saved to. Having selected the memory number, pressing SAVE twice
implements the save routine; pressing any other key cancels SAVE. The display fills with dots
while the save is being implemented.
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