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Chapter 2 Practice Using the TIA
TIA Tutorial
Input Configure:
Channels 1 and 2 are configured separately by clicking on the
appropriate channel. You can determine the input threshold in volts,
the threshold slope, the input coupling, and the input impedance.
In the HP E1743A/44A/46A/48A, input channel routing is also
selected in this area. All of these selections are modified in the
HP E1740A immediately.
This menu configures the measurement hardware parameters.
To select the channel used to acquire measurements, select
Setup>Measure/View Setup.
Trigger:
You can select whether the TIA will wait for a threshold crossing on the
trigger input before acquiring time stamp information. The threshold
choices are GND (0 volts), ECL (−1.3 volts) and TTL (1.4 volts).
Selecting 10:1 divides these threshold values by 10 if you are using a
10:1 oscilloscope probe on the trigger input.
You may also select a time delay from the trigger edge prior to the
acquisition of data. The selectable range of delay is 75 ns to 26.214 ms.
Calibration & Errors:
Clicking on the "Service" button lets you perform a variety of
calibration tests on the HP E1740A. Further information on the
calibration procedures can be found in the HP E1740A User's Guide.
The Calibration and Service window also provides a "Get Error"
button. If for any reason the HP E1740A front panel "Error" LED (red)
is illuminated, you can query the HP E1740A for the type of error. This
also clears the error condition on the instrument. The error type will be
displayed.
Click the Close button to return to the HP E1740A Setup menu.
2-8
Getting Started Guide
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