3152B User Manual
Publication No. 980935 Rev. A
3-2
Operation
EADS North America Test and Services
configuration.
Example 2, Model 3100M/R-3152B, default instrument format is
Modern
•
form:inst leg
modifies the commands set from Modern to
Legacy, *rst is automatically forced and the 3152B parameters
are modified to accept the defaults of the Legacy mode.
•
*rst
restores factory defaults for Legacy operation.
•
After shut-down, the 3152B powers up again in Modern
configuration.
Output
Termination
Output signals must be properly terminated to minimize signal
reflection or power loss due to an impedance mismatch. Proper
termination is also required for an accurate amplitude level at the
main output connector. Use 50
Ω
cables and terminate the main
and SYNC cables with terminating resistors. Use a 50
Ω
termination
at the far end of the cable if needed to improve impedance
matching.
The accuracy of the amplitude setting depends upon the load
impedance. The amplitude of the output signal will not match the
amplitude setting for loads that differ from 50
Ω
. To correct for this
error, program the actual load impedance and let the 3152B
automatically correct its signal amplitude. Use the following
command:
outp:load <value>
where <value> is the load impedance in ohms.
Input/Output
Protection
The 3152B provides protection for its internal circuitry at the input
and output connectors. Appendix A specifies the level of protection
for each input or output connector.
Power On/Reset
Defaults
At power-up or as a result of a software reset, the 3152B changes
all settings to their default values. Chapter 4 lists all settings and
their default values, as well as their maximum and minimum
allowable values.
It is good practice to reset the instrument between sequence events
to make sure that parameters that were programmed for previous
tests will not accidently interfere with future tests. Use the following
common command to reset the instrument to its default state:
*rst
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