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Unit of power slope: dB/GHz.
Power slope Setup range: -2 to +2.
6) [Power and attenuation] dialog box
a) [Power ON/off] check box
If this check box is ticked, the port will normally output the power. If this check box is cleared, the port output
power will be cut off.
b) [Coupling port power] check box
If the
[Coupling port power]
check box is ticked in the default mode, the power level Setups of two ports of the
analyzer will be identical. However, different power levels are required for ports in some measurement applications.
For example, the power of each port must be set separately to measure the gain and reverse isolation of one high-
gain amplifier, as the power of the input port of the amplifier is lower than that of the output port. If the
[Coupling
port power]
check box is cleared, the power level of each port can be set separately in the analyzer.
c) [State] bar
It is
[Auto]
in the default mode. In this case, the power ON/OFF state can be switched according to the
measurement needs.
[ON]
indicates the port power is always ON, while
[OFF]
indicates the port power is always
OFF.
d) [Port power] bar
Set the port power.
e) [Automatic attenuation] bar
If this check box is ticked, any power level can be set within the allowable range of the instrument. If this check
box is cleared, the source power and attenuation can be set manually for certain measurement, such as the reflection
amplifier (oscillator or unsteady-state amplifier) measurement. In this case, the matching source impedance (better
than the return loss of 20dB) should be set within a wide frequency range.
f) [Attenuation] bar
Set the attenuation
g) [Fixed amplitude mode] bar
Set the fixed amplitude mode, including
[Internal fixed amplitude]
,
[Receiver]
and
[Open loop]
. The amplitude
is not fixed in the
[Open loop]
mode.
h)
[Power slope]
check box
Tick the
[Slope]
check box and enter the slope value in the
[Slope]
input box to enable the power slope function.
The power slope is used to compensate the power loss of the cable and test fixture as a result of frequency increase.
If the power slope function is enabled, the output power of the test port will increase (or decrease) with the
increase of Sweep frequency.
Unit of power slope: dB/GHz.
Power slope Setup range: -2 to +2.
i) Attenuator Setups and power range
The programmable attenuator is used to cover the whole power range. It can adjust the power level of the tested
device while the power level of the reference path of the analyzer remains unchanged. Thus, higher accuracy and
characteristic indicates and more accurate matching of source output signals can be realized.
The fully accurate error correction can be done at the power point for measurement calibration. If the power level is
changed in the same attenuator Setups as those of measurement calibration, the accuracy of error correction is
higher in ratio measurement but poorer in non-ratio measurement.