FDI2056 Use
r’s Manual
v 2.0 r 1.1
– 03/13
Copyright © 2013 Metrolab Technology SA
62
www.metrolab.com
!INP
The analog input circuitry
doesn’t perform as it should.
This is a major issue, please contact us.
!RNG
The over-range detection mechanism does not perform as
expected.
This is a major issue, please contact us.
!HWU
A firmware upgrade, including FPGA reconfiguration, is needed.
The user may obtain detailed information on the problems encountered during the
autotest by examining status registers
STATUS
5 and
STATUS
6.
The autotest may also be executed by the host computer by issuing a
TST
command.
The command
AUT
allows the host computer to access the values measured by
the autotest. The instrument transfers this data in one block in a format similar to
that shown below:
To be defined.
Offset compensation (ISC, ADJ)
4-11-10
To adjust the offset of the acquisition module, the input signal is measured during
at least two seconds at a very high sampling rate (500 kSPS) and the mean is
used to zero the offset. This operation is performed as soon as the
ADJ
command
is sent to the instrument. This automatic adjustment is made for the current input
gain only.
You may either decide to use the internal switch to short-circuit the input coil or to
use your own external short-circuit taking into account thermocouple and other
effects.
To short-circuit the measurement coil, you must issue the
ISC
command.
Synchronization by the Host Computer (SYN)
4-11-11
As already mentioned in section 6.6, it is possible to synchronize a sequence of
measurements with an external event. This can either be a signal supplied to the
SYNC input of the acquisition module or it may be the
SYN
command generated
by the host computer.
When the user has defined the source of the trigger with external synchronization,
(
TRS,T,S
,
TRS,E,S
or
TRS,X,S
) the instrument will, once it has received the
RUN
or
IND
commands, wait for the external signal on the SYNC input or the
SYN
command before starting the measurement cycle.