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5.5.1
Remarks about the general commands
In mode 0 (RMS mode), a new power measurement is started after the “power?” command has
been given. Depending on the filter setting, the Radi
P
ower
®
performs the required number of
measurements and returns the RMS value of all samples taken.
The Radi
P
ower
®
uses a point (.) as decimal separator.
Acquisition speed, filter and VBW settings are important to obtain accurate measurements for
power measurements of AM modulated signals. For example, if an AM modulated signal is to be
measured with a modulation frequency of 1 kHz, the VBW should be set to 0, 1, 2 or AUTO. In
general the VBW should be 10 times smaller than the RF carrier frequency, but higher than the
modulation frequency.
The acquisition speed and filter should be set in such a way that at least one full period of the
modulation signal is measured. At 1 Msps, the filter should be set to 5 or higher, which results in
1000 or more samples. At lower sampling speeds, for example 100 ksps, the filter should be set to
3 or higher to measure at least one full period of the envelope signal.
In mode 1 (max hold), the “power?”-command will return the highest value measured, since the
previous “power?”-command. After reading the power, the stored value will be cleared.
The filter setting does not apply in mode 1 or 2.
The VBW setting can be different for mode 0 and the other two modes 1 and 2. If a VBW has been
set for mode 0, this will not affect the VBW setting for mode 1 or 2 and vice versa.
Power measurements will be interrupted if a temperature reading is requested.
The STORE command stores all settings in flash memory. All parameters mentioned in the table in
chapter 5.4 (default values) are stored, including the BAUD setting.
In mode 2 (envelope tracing), temperature readings are not updated as long as the triggering is
armed. While armed, temperature readings are still possible, but the actual values are taken before
the measurement is armed. As soon as a trigger occurs, the temperatures are updated in the
sensor.
