Fluke 9640A Series, Instruction Manual

Page: 93 / 324

Local Operation
Operating the Instrument
3
3-45
Applying an Offset to an Amplitude-Modulated Output Signal
Using the
AM Modulation
screen, the user can introduce an individual offset value for
each of the four parameters of the signal:
Frequency
,
Level
,
Mod Rate
, and
Depth
.
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 an amplitude-modulated output signal as described in the previous procedure.
2. Select the field to which the offset will be applied:
Frequency
,
Level
,
Mod Rate
, or
Depth
(parameter field).
3. Select the corresponding
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 screen.
7. To disable the offset, use the
Offset Disable
soft key at the bottom of the screen.
Table 3-16. Amplitude-Modulation Fields
ead94f.bmp
Field Range Units
Frequency 50.000000 kHz to
4.0240000000 GHz Hz (kHz, MHz, GHz)
Frequency Step
0.0001 kHz to
4.0240000000 GHz Hz (kHz, MHz, GHz)
Absolute
Offset may be applied in
either polarity to the full
dynamic range of the parent
parameter Hz (kHz, MHz, GHz), ppm**, %*
Frequency Offset
As UUT Error
Will be calculated for any
permitted Offset value
subject to limitations of % or
ppm if these units are used
(see below) ppm**, %**