HP 81200 User Manual page 116

Setting Up Ports and Channels
116
To change the characteristics of the second channel:
1 Adjust the rise/fall time of the second channel (only E4838A or E 4843A
frontends, see also "How to Set Generator Timing Parameters" on
page 110).
2 Set the low level of the second channel. This specifies the amplitude
Amp2.
Error messages will be displayed if you try to override the physical limits
of the E4838A frontend. If that occurs, you need to correct the amplitudes.
Example Assume the following setting:
High level = 1.5 V
First low level = 0 V
Second low level = 0 V
This results in the following OUT signal:
Logic at Channel 1
1
1
0
0
The method is once more illustrated below:
1st Channel
2nd Channel
Added signal
Figure 47 Analog Channel Addition
The above setting is accepted because the resulting amplitude and voltages
can be generated by the E4838A frontend.
If you have chosen one of the predefined levels for the connected
generator channel, you may need to change the second low level which is
set to 0 V per default.
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
How to Set Up a Port or Channel for Generated Signals
Logic at Channel 2
1
0
1
0
Output Voltage
1.5 V
0 V
0 V
–1.5 V
High level 1.5 V
Low level 0 V
High level 1.5 V
Low level 0 V
High level 1.5 V
0 V
–1.5 V