Step 8. Selecting the FIFO Mode
The HP E1313/E1413’s FIFO can operate in two modes:
•
Blocking: The FIFO stops accepting readings when it becomes full
(65,024 readings). Readings made after FIFO is full are discarded.
The first reading to exceed 65,024 sets the
STATus:QUEStionable:CONDition?
bit 10 (FIFO Overflowed), and
an error message is put in the error queue (read with
SYSTem:ERRor?
command).
•
Overwrite: When FIFO fills, the oldest readings in the FIFO are
overwritten by the newest readings. Only the latest 65,024 readings
are available.
The differences in these two modes is only significant if the rate of
retrieving data from the FIFO is slower than the reading rate of the A/D.
To set the FIFO mode (blocking is the
*RST
/power-on condition):
SENS:DATA:FIFO:MODE BLOCK
Select blocking mode.
SENS:DATA:FIFO:MODE OVER
Select overwrite mode.
Step 9. Initiating the Trigger System
The commands to initiate the HP E1413 are:
INITiate[:IMMediate]
and
INITiate:CONTinuous ON
The
INITiate
commands move the HP E1313/E1413 from the trigger idle
state to the wait-for-trigger state. When initiated, the instrument is ready to
receive one (
INITiate[:IMMediate]
) or more (
INITiate:CONTinuous ON
)
trigger events.
To initiate the instrument for the number of triggers specified with the
TRIGger:COUNt
command:
INIT
or
INIT:IMM
To have the instrument continuously in the wait-for-trigger state:
INITiate:CONTinuous ON
If
INITiate:CONTinuous
is
ON
and
TRIGger:SOURce
is
IMMediate
, the
module scans continuously until you execute
INITiate:CONTinuous OFF
.
Chapter 3
Using the HP E1313/E1413 89
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