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Modulation
The generator can be set for either internal or external FM. With the
MODULATION field of the main menu the modulation can be switched between INTERNAL and
EXTERNAL with alternate presses of the SELECT MODULATION key, or by using the rotary
control or
Internal modulation is fixed at 1 kHz. External modulation requires a modulating signal in the
range 300 Hz to 50 kHz to be applied to the EXT IN input.
Peak deviation can be set from 0.5 kHz to 100 kHz in 0.5 kHz steps. With the
in the PEAK DEVIATION field of the main menu the peak deviation can be set directly from the
keyboard, in kHz or MHz, or changed using the rotary control or
Principles for further information on keyboard entries. With external modulation, the specified
peak deviation is achieved with a 1Vrms sinewave modulating signal.
The selected modulation source can be switched on and off at any time using the MODULATION
ON/OFF key; the MODULATION lamp lights when modulation is on.
The default modulation settings are internal modulation, 50 kHz peak deviation, modulation off.
Storing and Recalling Set-ups
Complete instrument set-ups can be stored or recalled from non-volatile RAM using the STORE
and RECALL facilities on the Utilities menu, accessed by pressing the UTILITIES key.
With the
selection cursor in the STORE field of the Utilities menu the store to be used can be
selected with the rotary control or
available. Select the required store and press the EXECUTE key; the display requests that you
press EXECUTE again to confirm the operation (or any other key to cancel). A set-up already in
that store will be overwritten. The status of the RF OUT is ignored; when a store is recalled the
RF OUT is always off.
With the
cursor in the RECALL field of the Utilities menu a previously stored set-up, or the
factory defaults, can be recalled. Select the required store, or DEFAULTS for factory defaults, and
press the EXECUTE key; the display requests that you press EXECUTE again to confirm (or any
other key to cancel). If there is no valid data in the specified store the message 'NO VALID DATA
IN STORE' will be displayed and the set-up will remain unchanged.
keys.
keys. Nine stores, numbered 1 to 9 inclusive are
selection cursor in the
selection cursor
keys. Refer to Keyboard
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