User`s guide

290 Agilent X-Series Signal Generators User’s Guide
Digital Signal Interface Module (Option 003/004)
Operating the N5102A Module in Input Mode
6. Press the More (1 of 2) softkey.
From this softkey menu, select the bit order, swap I and Q, the polarity of the data, and access
menus that provides data negation, scaling, and filtering parameters.
7. Press the Data Negation softkey.
Negation differs from changing the I and Q polarity. Applied to a sample, negation changes the
affected sample by expressing it in the two's complement form, multiplying it by negative one, and
converting the sample back to the selected numeric format. This can be done for I samples, Q
samples, or both.
The choice to use negation is dependent on the device being tested.
8. To access I/Q scaling and filter parameters, press Return > N5102A Off On to On. This will invoke the
real time Custom format in the signal generator’s baseband generator. This is needed to set the
filter parameters when Pre- FIR Samples is selected as the data type.
9. Press the Baseband Setup softkey.
Use this softkey menu to adjust the I/Q scaling and access filter parameters. If the selected data
type is Samples, the Filter softkey is grayed out (inactive). For more information on user- defined
filtering, refer to the
“Using Finite Impulse Response (FIR) Filters in the Dual ARB Real- Time
Modulation Filter” on page 214 and “Modifying a FIR Filter Using the FIR Table Editor” on
page 220.
Digital Data
If the N5102A digital module is not on, press Return > Return > N5102A Off On to On.
Digital data is now being transferred through the N5102A module to the signal generator. The green
status light should be blinking. This indicates that the data lines are active. If the status light is
solidly illuminated (not blinking), all the data lines are inactive. The status light comes on and stays
on (blinking or solid) after the first time the N5102A module is turned on (N5102A Off On to On). The
status light will stay on until the module is disconnected from its power supply.
NOTE If changes are made to the baseband data parameters, it is recommended that you first
disable the digital input (N5102A Off On softkey to Off) to avoid exposing the device and the
N5102A module to the signal variations that may occur during the parameter changes.