PMX40 RF Power Meter – INSTRUCTION MANUAL
4-10
4.4.9
MAIN
Pulse Def
CH# Pulse Def:
Opens the Pulse Definition menu for the selected
channel.
MAIN
Pulse Def
CH# Pulse Def
Distal:
Sets the pulse amplitude percentage that defines the end
of a rising edge or beginning of a falling edge transition. Typically, this is
90% voltage or 81% power relative to the top level of the pulse. This
setting is used when making automatic pulse risetime and falltime
calculations.
Mesial:
Sets the pulse amplitude percentage that defines the
midpoint of a rising or falling edge transition. Typically, this is 50% voltage
or 25% power relative to the top level of the pulse. This setting is used
when making automatic pulse width and duty cycle calculations.
Proximal:
Sets the pulse amplitude percentage that defines the
beginning of a rising edge or end of a falling edge transition. Typically, this
is 10% voltage or 1% power relative to the top level of the pulse. This
setting is used when making automatic pulse risetime and falltime
calculations.
Pulse Units:
Controls whether the distal, mesial, and proximal
thresholds are computed as voltage or power percentages of the
top/bottom amplitudes. If Volts is selected, the pulse transition thresholds
are computed as voltage percentages, and if Watts, they are computed as
power percentages.
Many pulse measurements call for 10% to 90% voltage (which equates to
1% to 81% power) for risetime and falltime measurements, and measure
pulse widths from the half-power (–3 dB, 50% power, or 71% voltage)
points. The Pulse Units setting is independent of the channel’s display
units setting.
Start Gate:
Sets the beginning of the pulse measurement region as a
percentage of the pulse width. The Start Gate has a continuous range of
0.0% to 40.0% of the pulse width and may be entered numerically or
varied using the up or down arrows.
End Gate:
Sets the end of the pulse measurement region as a
percentage of the pulse width. The End Gate has a continuous range of 60.0% to 100.0% of the pulse
width and may be entered numerically or varied using the up or down arrows.
The Gate settings define the measurement interval for the following power related pulse
measurements: Pulse Average, Pulse Peak, Pulse Minimum, and Pulse Droop/Tilt. Pulse timing
