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How to Set Up a Port or Channel for Generated Signals
Name
TTL (into open)
TTL (into 50 τ to GND)
CMOS 5V (into open)
CMOS 3.3V (into open)
ECL (into 50 τ to -2V)
ECL (into 50 τ to GND)
PECL (into 50 τ to +3V)
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
2 Check the units.
The Parameter Editor displays default units and has default vernier
steps. Both can be changed (see "How to Change Units and/or Vernier
Steps" on page 69).
3 Decide on the additional options. The additional options are:
– Predefined Levels: Use the levels shown and entered in the window
(Custom) or use one of the predefined levels.
The predefined levels for a generator depend on the frontend. They
are listed in the table below:
Table 3
Predefined Generator Signal Levels
High
Low
Level
Level
2.5 V
0.0 V
2.5 V
0.0 V
5.0 V
0.0 V
3.3 V
0.0 V
-0.9 V -1.7 V
-0.9 V -1.7 V
4.1 V
3.3 V
– If you are using your own custom setting:
External impedance is usually the input impedance of the DUT.
voltage
Figure 42
External Impedance
The minimal termination voltage for a terminal that is not connected
to ground is –2 V.
Termination
Termination
Voltage
Impedance E4838A E4842A E4843A E4846A
0.0 V
Open
50 τ
0.0 V
0.0 V
Open
0.0 V
Open
50 τ
-2.0 V
50 τ
0.0 V
50 τ
3.0 V
HP 81200
current
LOAD (DUT)
e.g. 50 Ohms
Setting Up Ports and Channels
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
External
Impedance
x
x
x
x
x
x
x
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