Step 10. Retrieving Data; Accessing The Cvt - HP E1313A Manual

Step 10. Retrieving Data

Accessing the CVT

Note
90 Using the HP E1313/E1413
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When an INITiate command is executed, the driver checks several
interrelated settings programmed in the previous steps. If there are conflicts
in these settings an error message is placed in the error queue (read with the
command). Some examples:
SYSTem:ERRor?
•
If TRIGger:SOURce
INITiate:CONTinuous ON
•
Have programmable SCP gain or Current Source SCP settings
changed since the *CAL?
Each reading made during a scan is (by default) stored in two places:
•
The 64-channel Current Value Table (CVT). As the name implies,
the CVT contains the most current value read for each channel.
•
The 65,024 reading FIFO buffer. The FIFO allows the A/D to
maintain its high reading rate while your program transfers readings
from this buffer.
Readings can be continuously retrieved while the instrument is scanning.
A single command provides access to the channel readings in the Current
Value Table:
[SENse:]DATA:CVTable? (@<
•
The < ch_list > parameter specifies which channel value(s) to retrieve
from the CVT.
After *RST /power-on, each channel location in the CVT contains the
IEEE-754 value " Not-a Number" (NaN). Channel readings which are a
positive overvoltage return
IEEE -INF . Refer to the
NaN, +INF, and -INF values for each data format.
To access the latest reading from each of the instrument's 64 channels:
SENS:DATA:CVT? (@100:163)
Execute program input statement here.
To reset the CVT (and set all values to NaN), send the command
[SENSe:]DATA:CVTable:RESet
is not TIMer or IMMediate
, then ARM:SOURce
command was executed?
ch_list
>)
IEEE +INF and negative overvoltage return
FORMat[:DATA ] command in Chapter 5 for the
Completes when 64 readings
have been accepted by an input
statement.
Must input 64 readings.
.
with
must be IMMediate .
Chapter 3