While the module is measuring, the driver can be queried for its status, and
data can be read from the FIFO and CVT. One command can be given
which changes the measurement setup, that is, the scan list can be changed
using
ROUTe:SEQuence:DEFine
. The
INITiate:CONTinuous OFF
command may also be given to force a continuous measurement to
complete. Any other changes to the measurement setup will not be allowed
until the measurement completes, or an
ABORt
command is given. Of
course, any commands or queries can be given to other instruments while
the HP E1313/E1413 is actively measuring.
Averaging Readings
The HP E1313/E1413 provides on-board averaging of readings. When you
set averaging
ON
(
CALCulate:AVERage[:STATe] ON
), a reading returned
from the FIFO and/or CVT represents the average of two or more
measurements on that channel. Enabling averaging enables averaging for
all channels. The number of measurements per reading is set using
CALCulate:AVERage:COUNt 2 | 4 | 8 | 16 | 32 | 64 | 256
.
Special Considerations
The following restrictions apply when performing channel averaging.
•
Because each channel can be allocated only one memory location for
intermediate calculation results, an individual channel number must
appear in a scan list only once, and use of
LISTL
(List-of-Lists) is not
allowed.
•
In order to maintain high speed while averaging when
CALCulate:AVERage[:STATe]
is
ON
, channels must use manual
ranging.
Example Command Sequence
ROUT:SEQ:DEF LIST1,(@100,101,102,103)
Define scan LIST1.
ROUT:SCAN LIST1
Select scan LIST1.
SAMP:TIM LIST1,<
t
c
>
<t
c
> can be 10
µ
s to 32.768ms.
TRIG:SOUR TIM
TRIG:TIM:PER <
t
p
>
<t
p
> can be .1ms - 6.5536 s.
TRIG:COUN <
count
>
<count> can be 1 - 32768 or
INF but it MUST be
≥
CALC:AVER:COUNt.
ARM:SOUR <
source
>
<source> can be BUS, EXT,
HOLD, IMM, or TTLTrg0 -
TTLTrg7.
CALC:AVER:COUN 4
Each reading averages of 4
measurements.
CALC:AVER ON
Enable averaging.
INIT:IMM
Chapter 4
Understanding the HP E1313/E1413 131
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