Agilent Technologies E4406A, User Manual

Page: 78 / 230

78 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.
• Signal Rate key. To change the rate of the IF align signal you will
enter a divider number between 1 to 12. Each divider number
increment halves the signal frequency. For example, at the default
DAC setting of 1 the signal is set to 234.375 kHz. If the rate is set to
2 the signal is half that frequency, or 117.188 kHz.
• Signal Amptd key. To modify the signal amplitude you will enter a
DAC value between 0 - 4095. The amplitude range is approximately
50 dB. Incrementing the DAC value increases the amplitude of the
signal, and will be visible on screen.
• Signal Type key. This menu allows you to select a CW, comb, or
pulse type signal as the IF align signal.