User`s guide

4.7 Channel offsets for the E4419A/B dual channel

power meter

Prior to entering 438A language or after a local-

to-remote transition while in 438A language, the

E4419A/B channel offset state and level will be

altered as follows:

• If the channel offset is ON and the level is 0 dB,

then the channel offset will be turned OFF.

• If the channel offset is OFF and the level is not

0 dB, then the level will be set to 0 dB.

4.8 Preset

While in 437B/438A language mode, a front panel

preset will set the meter as detailed in the EPM

series User’s Guide, while a remote preset will set

the meter as detailed in the 437B or 438A manual.

4.9 Measurement errors

Measurement errors can occur for a variety of rea-

sons, but it is worth being aware of the error report-

ing methods used by the 437B and 438A. The status

message will report measurement errors and entry

errors. Also, the data output message may return an

error rather than the measurement result. The for-

mat for this method is +9.00xxE+40 where xx is the

measurement error code as listed in the 437B and

438A manuals (pages A2–3 for 437B manual; pages

3–57 for 438A manual). Some errors not mentioned

in these manuals are detailed below.

For E4418A/B:

+9.0000E+40 E4418A/B in standby mode and not triggered

(send TR1/TR2 before requesting result)

+9.0035E+40 E-Series sensor error (sensor data suspect)

+9.0036E+40 Must calibrate/zero (see section 4.14)

For E4419A/B:

+9.0000E+40 E4419A/B in standby mode and not triggered

(send TR1/TR2 before requesting result)

+9.0035E+40 E-Series sensor error on channel A

(sensor data suspect)

+9.0036E+40 E-Series sensor error on channel B

(sensor data suspect)

OR must cal/zero channel A

+9.0037E+40 Must calibrate/zero channel B

(see section 4.14)

Note: When a measurement/device error occurs,

the 438A always returns +9.0000E+40.