Numerical Display of the Boonton 4540 RF Power Meter Series
The Boonton 4540 series power meter captures displays and analyzes RF power in both time and statistical domains. The 4540 can measure modulated or CW signals using peak and average Boonton power sensors. One of the great features of Boonton 4540 series is to display text parameters of 15 time and power measurements for each channel simultaneously. From the front panel of 4540, there is a button called "Graph/Text". Pressing "Graph/Text" places the instrument in graph mode to display the current measurement waveforms in a graphical format. By pressing again the same "Graph/Text" button toggles to numeric/text display of the same measurement. By pressing the button "Menu/ Menu off" for 3 seconds switches the menu soft key off and provides larger screen area for measurements. It allows larger display for both text and graph mode with details information which is very convenient for any user.
Fig. 1: "Graph/Text" button toggles to numerical display of the same measurement
How to Enter Numerical Values on Boonton 4540
There are three different ways to modify the numerical entries to the Boonton 4540 power meter.Default Up/Down arrow keys - By pressing up or down arrow keys, it is possible to update the display and trace of a measurement as the value changes accordingly. The up/down arrow keys scrolls through available display "pages" or the displayed table of measurements and parameters in text mode. Single Digit Increment/Decrement - This mode allows changing the single digit of a numerical parameters value by highlighting the desired digit. Direct Entry - By using the numerical keypad from the front panel of the Boonton 4540, it is possible to enter directly the numerical values.
Fig. 2: Entering numerical values on Boonton 4540
How to Change Numerical Parameters
Modulated mode allows adjusting the parameters name from the front panel keypad of the Boonton 4540 Power meter. In order to select these parameter names go to
From "Text Mode" menu it is possible to select parameter names for both channel 1 and 2 as a source and option. Once the parameters are selected for each field of each channel, it will appear on the display during the measurement.
Numerical Parameters - Pulse Mode
The Pulse Mode is used with peak power sensors. The instrument functions as an enhanced peak power analyzer and provides the functionality of a random repetitive sampling for viewing and analyzing the RF power envelope of signals up to 40 GHz. The RF frequency range and detection bandwidth are sensor model dependent. Accuracy approaches that of average-only power meters, but with the additional ability to capture wide bandwidth
power-versus-time data. With an internal or external trigger event it can automatically measure up to 15 characteristics of the RF power envelope. These are: peak power, pulse power, average power, pulse width, risetime, falltime, overshoot, pulse period, pulse repetition rate, duty cycle, top amplitude, bottom amplitude, offtime, edge delay and the delay between two RF pulses.