Rf level – VXI 3002 User Manual

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3-7

RF level

These commands enable you to set the RF level in the range -137 to +25 dBm to a resolution of
0.1 dB. You can adjust the level in steps by setting the size of the step and then stepping the level
up or down. And after having adjusted the level you can either return to the reference level or
make the current level the reference level. You can set the units to a default if required. For
voltage related units, you can select either EMF or PD. You can also switch the output at the RF
OUT socket off or on. For attenuator hold see under 'Miscellaneous commands' below.

You can also set your own maximum output power limit which allows you to protect sensitive
devices connected to the RF OUT socket. The maximum calibrated output level is +25.1 dBm up
to 1.2 GHz and +19 dBm above this frequency. Above 1.2 GHz an uncalibrated level up to
+25.1 dBm is allowed. The setting will be saved in non-volatile memory so that when
subsequently the instrument is switched on again it will be set with your specified RF level limit.

The RF offset function enables you to offset the RF output level to compensate for cable or
switching losses, or to standardize a group of instruments so that they give identical measurements.
One offset is allowed in each of the following ranges:

9 kHz

150 MHz

300 MHz

600 MHz

1.2 GHz

2.4 GHz

The entered carrier frequency automatically selects the appropriate frequency range over which the
offset is applied. Set the required positive or negative RF offset in the range 0 to 5.0 dB to a
resolution of 0.1 dB. For each required additional range enter the carrier frequency then the offset.
Ensure that your offsets are saved so that when subsequently the instrument is switched on again it
will be set with your specified offsets.

RFLV

Set RF Output Level (short form)

:VALUE

Set RF Output Level

Data type : Decimal Numeric Program Data

Allowed suffices : Any one of: DBM, DBV, DBMV, DBUV, V, MV or UV

Default suffix : DBM unless changed by UNITS command

:INC

Set RF Level step (dB)

Data type : Decimal Numeric Program Data

Allowed suffices : DB only

Default suffix : DB

:UP

Go UP one step

:DN

Go DOWN one step

:RETN

Return to original setting

:XFER

Transfer current value to be the new setting

:ON

Turn RF Output ON

:OFF

Turn RF Output OFF

Data type : None

Allowed suffices : None

Default suffix : None

:TYPE

Selects EMF or PD for voltage related units

Data type : Character Program Data (EMF or PD)

Allowed suffices : None

Default suffix : None