Probe Selection
In Detail
3Ć88
Optical probes can combine the functions of an optical-power meter with the
oscilloscopes high-speed analog waveform analysis capability. You can
simultaneously acquire, display, and analyze optical and electrical signals.
Applications include measuring the transient optical properties of lasers,
LEDs, electro-optic modulators, and flashlamps. These probes can be used in
the development, manufacturing, and maintenance of fiber optic control
networks, local area networks (LANs), fiber-based systems based on the
FDDI and SONET standard, optical disk devices, and high-speed fiber optic
communications systems.
NOTE
When you connect an optical probe to the oscilloscope, the input
impedance automatically becomes 50
W
. If you then connect a high
input resistance passive probe you need to set the input impedance
back to 1 M
W
Vertical Control
on page 3-116 explains how to
change the input impedance.
The instantaneous time-interval to voltage converter (TVC) continuously
converts consecutive timing measurements to a time-interval versus time
waveform.
Timing variations typically appear as left-to-right motion or jitter. Time base or
trigger holdoff adjustments may improve display stability, but do not show
timing dynamics. The TVC untangles the often confusing waveforms and
delivers a coherent real-time view.
The TVC adds three measurement functions to the voltage versus time
capability of your oscilloscope: time delay versus time, pulse-width versus
time, and period versus time.
Optical Probes
Time-to-Voltage
Converter
Содержание TDS 620
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