3152B User Manual
Publication No. 980935 Rev. A
1-14 Introduction
EADS North America Test and Services
and phase when the TRG/PLL IN level is at logic 0, and a shifted
frequency, amplitude, or phase when the TRG/PLL IN level is at
logic 1.
EXT SCLK
The EXT SCLK connector accepts sample clock signals from an
external source. It accommodates frequencies from DC to 300 MHz
with a PECL (positive ECL) amplitude level. This signal replaces
the internal clock generator, either for low-noise applications or for
synchronization purposes. The sample clock input is active only
after selecting the External Sample Clock Source option.
EXT 10MHz
This input accepts a 10MHz reference signal and is labeled as PM
IN on the 3152B but can be programmed as either function. At the
factory, this input is configured for TTL logic levels. It may be
changed to 0 dBm, but only by qualified service personnel.
The EXT 10MHz input is available for applications requiring a more
accurate, stable reference than can be attained by the 1 ppm
TCXO reference built into the 3152B. The reference input is active
only after selecting the External 10MHz Reference Source option.
Output Waveforms
The 3152B can generate six types of waveforms:
•
Standard
(Fixed)
•
Arbitrary
•
Sequenced
•
Modulated
•
Digital
Pulse
•
Half-cycle
Standard (FIXED)
Waveforms
The 3152B must pre-load its memory before it can generate
standard waveforms. On power-up, the waveform memory contains
no specific data. The sine waveform, which is the default, is
computed and loaded into the waveform memory as part of the
reset procedure. Later, if you select another standard waveform,
the 3152B computes the waveform points and loads them into the
waveform memory.
Every time the user selects a new waveform, there is some delay
for the processor to compute the data and download it to memory.
The delay interval depends on the complexity of the waveform and
the number of points the processor has to calculate. It is good
practice to add sufficient delay to a test program to allow for this
delay. The delay could range from a few milliseconds to a few
seconds, and there are no special rules beside trial and error to
determine the necessary delay time.
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