Fluke 9640A Series, Instruction Manual

Page: 86 / 324

9640A
Instruction Manual
3-38
Setting Externally Leveled Sine Preferences
Table 3-12 shows the
External Leveling Preferences
screen. External Leveling accepts
a DC Voltage feedback from a Power Meter and allows the user to control signal level at
a remote Power sense point. The requirements for the external input are described earlier
in this chapter under the heading Modulation Leveling and Frequency Pull Input
Connector .
Use the following procedure to set the External Leveling Preferences:
1.
Press

to open the
Instrument Setup
screen.
2. Press the
Lev. Sine Prefs
soft key to bring up the
Leveled Sine Preferences
screen
shown in Table 3-12.
3. Press the
Ext Lev. Prefs
soft key to bring up the
External Leveling Preferences
screen
4. Sequentially select each of the preference fields using the soft keys to the right of the
screen.
While each field is selected, use the soft keys along the bottom of the display or the
scroll wheel to choose a preference.
5. To exit the screen, press the
Exit
soft key, or press one of the signal function keys
(

,

, or

).
Table 3-12. Externally Leveled Sine Preferences
ead341f.bmp
Field Preference
Full Scale Voltage Enter the Full Scale Voltage expected from the Power Meter
1.0 V to 5.0 V dc
Full Scale Power Enter the Full Scale Power of the Power Meter
10.00 mW to 1.000 W
Output Clamp The maximum allowable Output Level from the Instrument
Use Output Clamp to limit Instrument Output Power should a
feedback loop fault occur.
Response Time Adjusts response time to suit power sensor characteristics.
Fast, Slow
Notes:
•
When External Leveling is selected, the maximum level that can be requested at the main Leveled Sine screen will be the Full Scale Power
established above. The minimum Level is 1µW (-30 dBm). External Leveling is indicated in the Status bar, White = inactive, Green = OK,
Flashing Red = Level control out of lock, Red = Level control out of lock and Output Clamp active.
•
Depending upon external circuit gain or loss, the Instrument’s Output Level will take whatever value is necessary to achieve the set-point
level at the power meter. Output power will not exceed the Output Clamp value set.