Anritsu ML2437A - Example 7: Measuring Pulse Signals With a Duty Cycle

Measurement Examples Example 7: Measuring Pulse Signals With a Duty Cycle
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-17
7-7 Example 7: Measuring Pulse Signals With a Duty Cycle
In this example, we will be measuring the power output of a repetitive 500 ms pulse with a
10 ms pulse period.
In normal measurement mode the ML2430A power meter measures and displays average
power. When the signal to be measured is a repetitive pulse, an average power reading will
display average power over time and not the pulse power. By entering the duty cycle of the
pulse, the meter can mathematically correct to display the pulse power. This technique
assumes rectangular pulses with flat pulse tops.
Duty Cycle = Pulse Width / Pulse Period x 100 %
In the above example:
Duty Cycle = 0.5 ms / 10 ms x 100 % = 5 %
Press [Sensor]
> [-more-] > [Duty cycle].
The following screen is displayed:
Press [STATE] and toggle the setting by pressing the soft key until the display reads ON.
Press [DUTY] and using the keypad, input a duty cycle of 5 %. Press [Enter]. To return to the
Measurement screen press any hard key.
When measuring duty cycles with long pulse repetition frequencies, it may be necessary to
apply the Modulated Average mode (see Example 2, Measuring Modulated Carrier). Press
[Sensor]
> [Setup] > [MODE].
Toggle this setting until Mod Average is displayed.
Figure 7-26.
Figure 7-27.