224 Chapter 11
Peripheral Devices
N5102A Digital Signal Interface Module
6. Press the More (1 of 2) softkey.
From this softkey menu, select the bit order, swap I and Q, select the polarity of the transmitted
data, and access menus that provide data negation, scaling, gain, offset, and IQ rotation
adjustments.
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 and how it needs to receive
the data.
8. Press the Gain, Offset & Scaling softkey.
Use the softkeys in this menu for the following functions:
• reduce sample values for both I and Q using the Scaling softkey
• increase or decrease the sample values independently for I and Q using the I Gain and Q Gain
softkeys
• compensate for or add a DC offset using the I Offset and Q Offset softkeys
• rotate the data on the IQ plane using the Rotation softkey
9. Make any required scaling, gain, offset, or rotation adjustments to properly test the device.
10. Press Return > Return to return to the first-level softkey menu.
Configuring the Clock Signal
1. Refer to Figure 11-13. Press the Clock Setup softkey.
Figure11-13 Clock Setup Menu Location
Accesses the Clock Setup Menu