Boonton 4500B Peak Power Meter - Manual (Page 133)

Boonton 4500B RF Peak Power Analyzer
Operation 4-61
4.14 MEAS Key and Meas > Menu
The MEAS function key activates the Meas > menu (Figure 4-32). This menu contains the frequency assignments for each
channel, the system tracking control and the automatic measurement assignments for the parameter fields. In the Meas >
menu three items are dedicated to the frequency assignment for the channel 1 and channel 2 inputs. Frequency entries can be
assigned to each channel individually or to both channels at the same time. The entries in the two modes are independent,
which allows the instrument to hold three different frequency assignments. The selection of the frequency is determined by
the frequency of the signal being applied to the measurement channel. These entries are used to recall frequency related
correction data from the sensors connected to that channel. This data is automatically applied to the measurement. The range
of allowable frequency entries is determined by the sensor connected to channel. The limits can be viewed under the Spcl >
Sensor Data > CH 1 Sensor > Report. For Pulse and Modulated modes use Table 4-15; for Statistical mode, Table 4-17.
Table 4-14. Meas > Menu (pulse and modulated)
Menu Item Function
(Type) Selections (SCPI cmd)
Freq Track
Pulse, Mod Selects the channel frequency entry mode.
(Toggle) On, Off
When frequency tracking is ‖On‖, the same
frequency is assigned to both channels.
Changing either CH1 or CH2 frequencies
changes both of them. Both windows are
updated.
When frequency tracking is ―Off‖, the
frequency for each channel can be
individually assigned.
SENSe:CORRection:FRQTRK {ON, OFF}
Freq CH1
Pulse, Mod Selects the input signal frequency on CH1 for
(Numeric) Continuous Range: frequency correction.
(Sensor Dependent)
To set the CH 1measurement frequency, press
the Meas > menu key and use any of the data
entry controls to select the measurement
frequency in GHz. If frequency tracking is
―On‖, CH 2 will be set to the same frequency.
The frequency response characteristic for
each power sensor is recorded in an EEPROM
in the sensor before shipment from the factory.
The Model 4500B downloads this data and
creates a look-up table of correction factors
that are applied to each power measurement.
If the measurement frequency lies between Fig. 4-32. Meas > menu
two values in the table, the correction factor
is interpolated.