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84 Chapter 3
Setting the Mode
Mode Setup
Adjust Input Attenuation and Input Power.
• Max Total Pwr key. The
Max Total Pwr key can be activated only
when
Input Port is set to RF. Max Total Pwr allows you to enter
maximum power levels (
−15 dBm is the default value) for the RF
input. The maximum total power setting is coupled to the input
attenuation setting.
•
I/Q Input Z key. The I/Q Input Z key can be activated only when Input Port
is set to
I/Q. The I/Q Input Z key enables you to choose an input
impedance of either 50
Ω or 600 Ω. An input impedance of 600 Ω may
be needed for certain telecommunications applications.
• Input Atten key. The
Input Atten feature can be activated only when
Port is set to RF. The Input Atten feature allows you to enter the
attenuation value. The input attenuation can be set at values from
0 to 40 dB in increments of 1 dB. The input attenuation setting is
coupled to the maximum total power setting.
NOTE The Max Total Pwr and Input Atten settings are coupled together. When you
switch to a different measurement, the
Max Total Pwr is kept constant,
but the
Input Atten may change if the two measurements have different
mixer margins. Thus, you can directly set the transmitter tester input
attenuation, or you can set it indirectly by specifying the maximum
expected power at the UUT (Max Total Pwr setting).
Adjust the IF Align Signal.
NOTE The IF align signal adjustments are advanced features. IF align rate,
amplitude and type should not be modified unless you are familiar with
IF align functionality.
•
Signal Rate. The signal is modulated by a digital sequence that can be
set to 1 of 13 positions (rate 0 through 12) to cause the comb spacing
(or pulse timing) of the alignment signal to widen or narrow. At the
position of 1 the signal rate is set at its maximum value of 234.375
kHz. This frequency rate value will appear in the softkey label. Each
time the position integer is incremented, the signal rate is halved.
For example, at a position of 2 the signal rate is 117.188 kHz.
• Signal Amptd key. To modify the signal amplitude you will enter a
DAC value between 0 - 4095. The amplitude range is 0 to 50 dB.
Incrementing the DAC value increases the amplitude of the signal in
a linear fashion, and will be visible on screen. The default DAC value
is 500.
• Signal Type key. This menu allows you to select a CW (a tone that
appears in the center of the IF), comb, or pulse type signal as the IF
align signal.