HP 8530A, Руководство по эксплуатации и программированию, Страница: 57 / 439

Principles of Operation
Internal Data Flow
Figure 2-4 shows the parallel design of the two channels . Data has already been converted to
digital information at this point in the receiver's processing.
Figure 2-4. Independent Data Processing in Each Channel
Raw Data Stages
The microprocessor accepts the digitized real and imaginary data, and corrects IF gain and
quadrature errors before any other data processing is done . The calibration coecients used
in the IF correction stage are calculated periodically with an automatic self-calibration. This
automatic feature is dierent from the user calibration features . Next, the inputs are ratioed
together and identical copies of the data are sent to independent Channel 1 and Channel 2 data
processing paths .
There are eight raw data arrays . (Each parameter has its own raw data array , and each channel
has its own separate group of four parameters each.) The raw data array can be stored to
disc , or be transferred to or from a computer . Y ou can actually send raw data into the receiver
from a computer , and the HP 8530A will process that data through later stages as if it were
measured data.
Now , any selected averaging is performed on Channel 1 or Channel 2. If the F ast CW mode is
in use , data is sent to the F ast CW buer from the active channel. If F ast CW mode is not being
used, Channel 1 averaged data is stored in the Channel 1 raw data array . Similarly , Channel 2
averaged data is stored in the Channel 2 raw data array .
Data \arrays" are data holding locations . A data array holds one X,Y data pair in a special
compressed data format called \F orm 1." This format is described in the HP 8530A K eyword
Dictionary. The F ast CW buer can send data to computer if you are using the F ast CW mode .
The buer contains up to 100,000 X,Y data pairs in F orm 1 format.
2-6 System Overview