51
Signametrics
5.6 Windows Command Language
The following section contains detailed de
se
commands that pe
y the SM204
ither
be retrieved as a st
g
DMMErrStri
UserDMM.H
file
ll the pertinen
for the various functions is based on “C” f
s DLL containing
these functions as
int
values to b
c
long
type). TRUE
1 and FALSE i
is also differe
.
SMX20
40
;
SM
;
Description
r
"sm2
iSamples, double FAR *dThresh
)
SMX2040 for
owing reception of this command the DMM makes
exceeds the threshold,
dThresh.
When this occurs, a trigger is produced with identical processing as in
ArmTrigger
. Threshold crossing sense is determined by the first measurement
f
DMMArmAnalogTrigger
. If that measurement is lower than the
, subsequent measurements greater than
dThresh
will trigger the
an
dThresh
, subsequent measurements
ple, if
dThresh
is 2.00000 V and the first
MM is 2.500000 V, then 1.999999 V (or smaller) will trigger
f
dThresh
is 1.000000 V and the first reading after arming
ater) will trigger the DMM.
mand
can
E
, it should not be used again prior to
reading the buffer, since it prepares the buffer for reading when it detects a ready
dition.
scriptions of each function of the Windows command language. Tho
0 are indicated. Most functions return an error code. The code can e
rtain to onl
ring usin
contains a
ng
function, or looked up in the
SM204032.H
header file. The
t definitions for the DMM ranges functions etc. The following description
unction declarations. Keep in mind that the Window
sumes all
s 0 (which
e windows 32bit integers (corresponds to VisualBasi
nt from VisualBasic where True is –1 and False is 0)
is
DMMArmAnalogTrigger
X20
44
Arm DMM fo analog level trigger operation.
#include
04032.h"
int DMMArmAnalogTrigger
(
int
nDmm, int
Remarks
This function is usable for VDC, VAC, Ohms, IAC, and IDC. Setup the
analog level trigger operation. Foll
easure
m
ments continuously, waiting for a value which
DMM
following the call o
set threshold,
dThresh
DMM. If the first measurement is greater th
smaller than
dThresh
will trigger. For exam
reading after arming the D
the DMM. On the other hand, i
the DMM is 0.500000 V, then 1.000001 V (or gre
The
dThresh
value is in base units, and must be within the DMM range setting. For
example, in the 330 mV range,
dThresh
must be within -0.330000 and +0.330000. In the
33 k
Ω
, range
dThresh
must be between 0.0 and 33.0e3.
Following an analog level trigger event, the DMM makes
iSamples
readings at the set
function, range, and reading rate, and stores them in an internal buffer. Autoranging is
not allowed when using
DMMAnalogTrigger
. Between the time the
DMMArmAnalogTrigger
is issued and the time the buffer is read, no other com
should be sent to the DMM. One exception is the
DMMDisArmTrigger
command.
Use the
DMMReady
to monitor when the DMM is ready. When ready, you
read up-to
iSamples
, using
DMMReadBuffer
or
DMMReadBufferStr
functions. Once
DMMReady
returns
TRU
con
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