User`s guide

General Power Meter Functions 2
N1913/1914A EPM Series Power Meters User’s Guide 53
Procedure
Set duty cycle as follows:
1 Press to display the Channel Setup screen. Confirm the channel
requiring setup is displayed.
2 Press to display the Offsets Setup.
3 Use the and keys to highlight the Duty Cycle setting field.
4 Press to check the Duty Cycle setting field.
Figure 2-17 Duty cycle setting
5 Press to highlight the Duty Cycle value field and press to
display the Duty Cycle pop- up. Use the numeric keypad to enter the
required value in the Duty Cycle pop- up window.
6 Confirm your choice by pressing .
7 Press key to complete the duty cycle entry. The Dty Cyc
indicator is displayed as shown in Figure 2- 18.
Figure 2-18 Duty cycle indicator
Offsets
Duty cycle
setting field
Duty cycle
value field
%
Duty cycle
indicator
NOTE
Pulse power averages out any aberrations in the pulse such as overshooting or ringing.
For this reason, it is called pulse power and not peak power or peak pulse power.
In order to ensure accurate pulse power readings, the input signal must be pulsed with a
rectangular pulse. Other pulse shapes (such as triangle, chirp, or Gaussian) will cause
erroneous results.
The pulse power on/off ratio must be much greater than the duty cycle ratio.