User`s guide

4.11 Recorder output

The recorder output on the 437B or 438A would

normally be used with manual ranging and pro-

duces an analog output level (0 to +1 volts) that is

proportional to the power level being measured.

This voltage level is scaled relative to the minimum

and maximum power levels for the current range.

The EPM series power meter has one continuous

range. Therefore, in order to be compatible with

the 437B or 438A, it is necessary to manually set

the EPM series power meter recorder minimum

and maximum power levels to suit the power

being measured (see the EPM series User’s Guide,

Chapter 2, “Recorder Output” section). It should

also be noted that the recorder output on the 437B

and 438A is permanently enabled, while on the

EPM series power meter it can be turned off. The

recorder output on the E4419A is also channel

selectable. The E4419B has two recorder outputs,

dedicated to each measurement channel.

4.12 Extensions to the 437B/438A command set

In addition to the 437B/438A command set, the

EPM series power meter in 437B/438A language

mode also accepts some extra commands, as

described below.

• Language selection: allows either SCPI or 437B/

438A language to be selected. This command is

accepted by both language modes and can also

be queried, whereby it will return either SCPI,

437B, or 438A.

Note: When changing language remotely, allow a

one-second delay before sending further remote

commands.

SYSTEM

LANGUAGE

SPACE SCPI

437B

438A

For E4418A/B

For E4419A/B