Power Meter Operation

Making Measurements using Frequency Dependent Offset Tables

6. Press

Frequency

. The current setting of the frequency is displayed

Cal Fac

 

 

 

under the

 

A Freq

softkey.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7.

To change this setting press

 

 

. The power meter displays

 

A Freq

 

 

 

the frequency in a pop up window. Modify this frequency (see

 

 

 

below) as desired.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

■

Use

or

to modify the digit on which the cursor is

 

 

 

 

currently positioned.

 

 

 

■

Use

or

to move to other digits.

 

8.

To confirm your choice press the appropriate frequency unit.

 

9.

Connect the power sensor to the signal to be measured.

 

10.

You must set the display to the type of measurement you require.

 

 

 

This can either be a direct channel measurement, a ratio

 

 

 

measurement of both channels, or a difference measurement

 

 

 

between both channels. Use the following key presses:

 

 

 

Press

Meas

,

 

 

 

. Select the appropriate softkey for

 

 

 

Input Select

 

 

 

Setup

 

 

 

 

 

 

 

 

 

 

 

the measurement you require, either

A

,

B

,

A/B

,

B/A

, or

More

,

 

 

 

then

 

 

, or

 

 

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A-B

 

B-A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.

The measurement result is now displayed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note

If the measurement frequency does not correspond directly to a

 

frequency in the sensor calibration table (if selected) and the

 

frequency dependent offset table being used, the power meter

 

calculates the calibration factor and offset using linear

 

interpolation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If you enter a frequency outside the frequency range defined in the

 

sensor calibration table or the frequency dependent offset table,

 

the power meter uses the highest or lowest frequency point in the

 

appropriate table to set the calibration factor and offset.

 

The value of the calibration factors being used by the power meter

 

to make a measurement is displayed under the

 

or

 

A Cal Fac

 

 

 

softkeys.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B Cal Fac

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Editing Frequency Dependent Offset Tables

You can edit frequency dependent offset tables using the “Edit” menu as shown in Figure 2-7.

2-32

HP E4419B User’s Guide