HP 8153A - The Loss Key; Preparation; The Modify Keys; The System Key

The System Key
(System) Changes the instrument to system mode (the next chapter gives a
description of system mode).
The Modify Keys
The section “The Modify Keys” in Chapter 2, gives a description of how to use
the Modify keys.
The Loss Key
(Loss) starts the loss application. You need both a source and a sensor module to
run this application.
A loss measurement tells you how much of your optical signal you lose by
passing it through a device. You calculate loss by the following formula:
Loss - 10log(^)dB
•t in
To measure loss you need both quantities, Pj,, and P„ut. The application
measures Pi„ when you start it running. Once you have taken a reference, the
instrument expresses all the following results relative to this. These results are
loss results.
Preparation
You need both a source and a sensor module for the Loss application.
Before you start the Loss application, make sure that you have set all the
measurement-parameters that you use. It is most important to make sure that
you have .set T for the sensor and A for the source. If you are already in Menu
mode, you have to return to Measure mode to set these parameters.
3-2 Local Control - Menu Mode