Setting AM Noise Measurement

Follow the steps below to measure the AM Noise by using the E5052B’s AM Noise measurement window.

To improve readability and reduce search time, few sections of this topic are combined with similar sections from other measurements in Measurement > Common Settings. Links to these new sections are provided in this topic.

Selecting Measurement Window

Press Meas/View > AM Noise to select the AM Noise measurement window.
You can maximize the AM Noise measurement window by pressing the Window Max key while the window is selected. You can return to the original size when you press the Window Max key once again.

Selecting Carrier Frequency Band

Press Setup > Frequency Band.
Select the appropriate frequency band that contains the target carrier signal from the softkey menu list. The range of each frequency band is listed in the following table.

Selectable frequency bands differ depending on whether the E5053A Microwave Downconverter is used and whether the RF input is direct input or Downconverter input. For setting of downconverter and external mixer, refer to Setting E5053A Microwave Downconverter

Carrier Frequency Band	Standalone E5052B or Downconverter: OFF	Downconverter: ON & RF Input: E5052B Direct	Downconverter: ON & RF Input: Downconverter and External Mixer Not Used	Downconverter: ON & RF Input: Downconverter and External Mixer ON
60M - 111MHz	Y	Y	N	Y
109M - 1.5GHz	Y	Y	N	Y
250M - 3GHz	N	Y	N	N
250M - 7GHz	Y	N	N	Y
3G - 10GHz	N	N	Y	N
9G - 26.5GHz	N	N	Y	N

Auto Settings in Attenuator and Carrier Frequency Band

From firmware rev A.3.10, Frequency band and Input Attenuator can be setup to optimum value according to input signal through automatic setting.

It is enabled when Trigger to AM Noise is selected.

Press Setup > Auto Setting.
Carrier frequency band and Attenuator should be set to optimum value according to input signal.

Auto setting Parameter at each measurement status is as follows.

Measurement status (AM)	Freq Band	Attn	IF Gain
Downconverter=Off	Y	Y	N
Downconverter=On, RF Input=E5052B Direct	Y	Y	N
Downconverter=On, RF Input=Downconverter, Ext.Mixer=Off	User set	10dB	N
Downconverter=On, RF Input=DownConverter, Ext.Mixer=On	N	N	N

Specifying Nominal Frequency

Enter the nominal value of the carrier frequency.

Press Setup > Nominal Frequency.
Enter the value of the nominal frequency in the data entry field displayed in the upper part of the screen.
When the downconverter is turned on, the RF input is set to Downconverter, and the external mixer is set to Not Used, the function to search for the carrier signal in the specified carrier frequency band and reflect the result to the nominal frequency is available.
You need to specify nominal frequency only when the downconverter is available.
The carrier search function is to detect the input signal frequency with the selected carrier frequency band for the downconverter RF IN (i.e. 3 to 10 GHz or 9 to 26.5 GHz) and reflect the result to the nominal frequency.

See also Executing Carrier Search Function.

Selecting Measurement Quality

Press Setup > Measurement Quality.
Select the appropriate quality level from the softkey menu list. The available options are Normal and Fast.
To obtain the outline of the measurement data, select “Fast” for the quality level. If you need more precise frequency resolution, select “Normal” for the quality level.

Selecting Measurement Mode

You can select the High-speed measurement mode or Normal-speed measurement mode with the following steps.

Press Setup > Fast Measurement > ON | OFF
ON indicates High-speed measurement mode. When this mode is selected measurement is made only once with a single trigger.

OFF indicates Normal-speed measurement mode. In this mode measurement is made twice with a single trigger by changing internal settings as the internal spurious are reduced with software process.

Specifying Sweep Range for Offset Frequency

Press Start/Center (Stop/Span) > Start.
Select the sweep start value from the softkey menu list.

You can select the value from the options: 1 Hz, 10 Hz, 100 Hz or 1 kHz.

Press Stop/Span (Start/Center) > Stop.
Select the sweep stop value from the softkey menu list.

You can select the value from the options: 100 kHz, 1 MHz, 5 MHz, 10 MHz, 20 MHz, 40 MHz.
Sweep stop values that are selectable differ depending on the selection of the carrier frequency band.

1. - For 60 M - 111 MHz
    
    100 kHz, 1 MHz, 5 MHz, 10MHz, 20MHz
  - For frequency bands other than above
    
    100 kHz, 1 MHz, 5 MHz, 10 MHz, 20 MHz, 40 MHz

The number of measurement points varies depending on the setting value for the sweep range.

Relation Table for Measurement Points and Sweep Range

Start/Stop	100 kHz	1 MHz	5 MHz	10 MHz	20 MHz	40 MHz
1 Hz	646	775	865	904	943	982
10 Hz	517	646	736	775	814	853
100 Hz	388	517	607	646	685	724
1 kHz	259	388	478	517	556	595

For AM Noise measurement, you cannot use the center value or span value for log sweep.

Setting Average Function and Correlation Number

About DC Voltage Setting and Protection

You can specify DC power/control that is applied to DUT. Refer to Setting DC power/DC control and protection for the setting procedure.

About Auto Frequency Control Function

If this function is turned on, the E5052B will adjust the control voltage automatically so that the output signal frequency from the DUT may keep the specified value. For the setting procedure, refer to the Auto Frequency Control Function.