Boonton 4500B Peak Power Meter - Manual (Page 316)

Boonton 4500B RF Peak Power Analyzer
Application Notes 6-6
Table 6-1. Pulse Terms
TERM DEFINITION
Base Line
The two portions of a pulse waveform which represent the first nominal state from which a pulse departs
and to which it ultimately returns.
Top Line
The portion of a pulse waveform which represents the second nominal state of a pulse.
First Transition The major transition of a pulse waveform between the base line and the top line (commonly called the
rising edge).
Last Transition The major transition of a pulse waveform between the top of the pulse and the base line. (Commonly called
the falling edge.)
Proximal Line
A magnitude reference line located near the base of a pulse at a specified percentage (normally 10%) of
pulse magnitude.
Distal Line
A magnitude reference line located near the top of a pulse at a specified percentage (normally 90%) of
pulse magnitude.
Mesial Line
A magnitude reference line located in the middle of a pulse at a specified percentage (normally 50%) of
pulse magnitude.
6.3 Automatic Measurements
The Model 4400A/4500A automatically analyzes the waveform data in the buffers and calculates key waveform parameters.
The calculated values are displayed in text mode when you press the TEXT/GRAPH system key.
Automatic Measurement Criteria
Automatic measurements are made on repetitive signals that meet the following
conditions:
Amplitude. The difference between the top and bottom signal amplitudes must
exceed 6 dB to calculate waveform timing parameters (pulse width, period, duty
cycle). The top-to-bottom amplitude difference must exceed 13 dB to measure
rise and falltime.
Timing. In order to measure pulse repetition frequency and duty cycle, there
must be at least three signal transitions. The interval between the first and third
transition must be at least
1/5 of a division ( 1/50 of the screen width). For best
accuracy on rise and falltime measurements, the timebase should be set so the
transition interval is at least one- half division on the display.