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Chapter 3 Demo Waveforms
Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response
and Settling
Demo 1: Voltage-Controlled Oscillator (VCO)
Frequency Step Response and Settling
This demonstration shows a VCO whose output is stepped from 9 MHz to
10 MHz. The raw data, or "time stamps" were previously recorded and
subsequently saved to a file, along with the measurement setup which
processes the time stamps into frequency deviation measurements.
The following will be demonstrated:
•
Recalling data files from disk
•
Using the cursors and markers
•
Zooming and scaling
•
Frequency deviation measurements
•
Settling time measurement
•
Frequency overshoot measurement
Start
1
Select File>Load Setup... .
2
Open the demo sub directory (c:\hpe174Xa\demo) and click on the file
"vco.stp."
3
Click the OK button.
Overview
The VCO under test has a voltage step applied to the input control voltage
causing the frequency output to step from 9 MHz to 10 MHz. A trigger
signal occurs approximately 116 µsec prior to the voltage step. This
trigger signal is connected to the "Trigger" input of the HP E1740A.
The VCO output signal is connected to input 1 of the HP E1740A, and is
1 volt pk-pk, centered at 0 volts (no DC offset).
Getting Started Guide
3-3
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