Fluke 9640A Series, Инструкция по эксплуатации

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9640A
Instruction Manual
3-54
Applying an Offset to a Phase-Modulated Output Signal
Using the P
M Modulation
screen the user can introduce an offset value for all four
parameters of the signal:
Frequency
,
Level
,
Mod Rate
, and
Deviation
. Once the offsets
are in place, they remain active until they are changed or until the Instrument is powered
on again.
Use the following procedure to set an offset for one or more of the four signal
parameters:
1.
Create a phase-modulated output signal as described in the previous procedure.
2. Select the desired field:
Frequency
,
Level
,
Mod Rate
, or
Deviation
(parameter
field).
3. Select the
Offset
for the parameter (bottom of the screen). An Offset label appears on
the right of the screen.
4. Press the
Offset
soft key to select the offset field.
5. Press the
Offset
soft key, and enter the desired offset value. Notice that the value in
the parameter field follows the offset value.
6. To toggle the offset value off and on, use the
Toggle Offset
soft key at the bottom of
the display.
7. To disable the offset, use the
Offset Disable
soft key at the bottom of the display.
8. Repeat this procedure, as needed, for each signal parameter.
Creating a Sweep Output Signal
The following procedures provide instructions for creating swept-frequency output
signals.
Note
The source is a digital synthesizer of frequency and level. All sweeps are a
sequence of finite steps between discrete frequencies as determined by the
user settings.
Setting the Sweep Preferences
Table 3-19 shows the preference screen for creating sweep signals. The requirements for
the external triggers are described earlier in this chapter under the heading External
Sweep Trigger I/O .
Use the following procedure to establish the preferences for swept frequency output
signals:
1.
Press

to open the
Instrument Setup
screen.
2. Press the
Sweep Prefs
soft key to bring up the
Sweep Preferences
screen shown in
Table 3-19.
3. Sequentially select each of the preference fields using the soft keys to the right of the
display.
While each field is selected, use the keys along the bottom of the display to choose a
preference.
4. To exit the screen press the
Exit
soft key, or press one of the signal function keys
(

,

, or

).