Power Meter Operation

Recorder Output

Recorder Output

The rear panel Recorder Output connector produces a dc voltage that corresponds to the power level in Watts of the selected channel, depending on the measurement mode. The Recorder Output is disabled (0 V) during ratio, difference and relative measurements. This dc voltage ranges from 0 to +1 Vdc. The output impedance is typically 1 kΩ . Channel and display offsets, and duty cycle have no effect on the Recorder Output.

For example, the Recorder Output can be used to;

•record swept measurements on an X-Y recorder

•level an output from a source using external leveling, or

•monitor the output power on a strip chart recorder. A setup for recording swept measurements is shown in Figure 2-13.

Figure 2-13: Test Setup for Recording Swept Measurements

 

 

 

 

RECORDER

Swept Source

Device

 

OUTPUT

 

 

 

 

Under Test

 

SWEEP

RF OUT

IN

OUT

Power Meter

OUT

 

 

 

 

 

X-Y Recorder

CHANNEL A

 

 

INPUT

X-AXIS (FREQUENCY)

 

 

Y-AXIS (POWER)

 

 

 

 

 

 

 

To access the “Recorder” menu press

System

,

 

,

 

.

 

Recorder Output

More

Inputs

 

 

 

This menu allows you to switch the Recorder Output signal either on or off. The Max Power and Min Power softkeys allow you to enter the input power level that you want to represent the 1 Vdc maximum and

0 Vdc minimum output voltage of the Recorder Output. The Output A B softkey allows you to select which channel is represented on the Recorder Output.

HP EPM-442A User’s Guide

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