PMX40 RF Power Meter – INSTRUCTION MANUAL
3-8
Parameters Related to the Markers Menu
Marker 1
-300 uS
Marker 2
300 uS
Parameters Related to the Pulse Def. > CH# Pulse Def > Menus
Distal
90%
Mesial
50%
Proximal
10%
Pulse Units
Watts
Start Gate
5.00%
End Gate
95%
Parameters Related to the Stat Mode Menu
Cursor Mode
Power
3.5
Making Measurements
T
o perform accurate measurements, the following is a minimum list of things you should know about
the signal that you wish to measure.
Signal Frequency
- The center frequency of the carrier must be known to allow sensor frequency
response compensation.
Modulation Bandwidth
- If the signal is modulated, know the type of modulation and its bandwidth.
Note that power sensors respond only to the amplitude modulation component of the modulation, and
constant envelope modulation types such as FM can be considered a CW carrier for power
measurement purposes.
3.5.1
Continuous Mode
Continuous mode is best for measuring repetitive signals. Since this mode performs a continuous
measurement, it does not differentiate between the times a pulsed or periodic signal is off, and the
times it is on. If you wish to make measurements that are synchronous with a period of a waveform,
consider using Pulse mode instead.
Continuous mode is the best for the following types of measurement:
•
Moderate signal level (above -40 dBm for Peak sensors and -60 dBm for CW sensors).
•
Signal that is CW or continuously modulated with a modulation bandwidth that is less than
the VBW of the sensor in use.
•
Signal modulation may be periodic, but only non-synchronous measurements are needed
(overall average and peak power).
•
Noise-like digitally modulated signals such as CDMA and OFDM when only average
measurements are needed.
