China Electronics Technology Instruments AV3672 Series, User Manual

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4 Measurement Setting
4.4 Setting of Signal Power Level
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Tick the [Channel Power 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 setting range: -2 to +2.
6) [Power and Attenuator] 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) [Port Powers Coupled] check box
If the [Port Powers Coupled] check box is ticked in the default mode, the power level settings 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
[Port
Powers Coupled] 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] 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) [Attenuator] bar
Set the attenuator.
g) [Leveling Mode] bar
Set the leveling mode, including [Internal] , [Receiver] and [Open loop] . The amplitude is not fixed in the [Open
loop] mode.
h) [Channel Power Slope] check box
Tick the [
Channel Power 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 setting range: -2 to +2.
i) Attenuator Settings and power range
The programmable attenuator is used to cover the whole power range. It can adjust the power level of the DUT