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***
22
EXCITATION WITH
DELAY
***
FUNCTON
I
This instruction is used in conjunction with
others
for
mfasuring a
response
to
a
timed
excitation using
the switched analog
outputs.
lt
sets
the
selQcted
excitation output to
a
specific
value, waits for the specified time, then turns
off
the
excitatioth
and
waits an additional specified
time before oontinuing on to the next instruction
in
the progrqm
table. The
excitation on time can
be set to zerp and
the off time delay can
be
used
if
the oply requirement
is
the delay of
program
ex{cution.
PARAM.
NUMBER
01:
02:
03:
o4;
Input locati
ATA
YPE
*** 23
BURST MEASUREMENT ***
FUNCTION
Instruction 2g
witt
repeatedly make
a
voltage
measuremeht on a series of single-ended
or
differential dhannels, applying excitation if
desired. Thb measurement
units
are millivolts
prior
to
scaling. The
measurements saved can
be
those m4de immediately upon execution of
the
instructiOn
or grouped around a specified
trigger
condition. The
results
of
the
measuremehts may be
stored in Input Storage
or
the raw
AUD
data
can be sent out the serial
port. The
minimum sample
time per channel
is
970ps (i.e., one
channelcan
be sampled at
a
maximum rdte
of 1030 Hz).
MEASUREMENT
The
voltaqg measurement must use the fast
integration
of
250;rs.
Differential
are made with a single
integration.
ended or
a
integration
The noise level on
a
fast single-
DESCRIPTION
Excitation channel
number
4
Delay
time in hundredths
of
a
second
that
.excitation is
on
4
Delay
time in hundredths
of a
second after
excitation
is
turned off
FP
Excitation
voltage
in
millivolts
s
altered:
0
measurement
with
1
SECTION
9.
INPUT/OUTPUT INSTRUCTIONS
and greater
voltage ranges are practical (range
codes 13-15).
Excitation
is
always supplied
from excitation
channel
1.
The excitation
voltage in millivolts
is
entered in Parameter
9.
lf
excitation is not
needed, enter
0
for Parameter
9.
TRIGGER
Measurements may
be
triggered either by
the
value
of
the measurement on the first channel
being measured
or by an
externaldigitaltrigger.
Three options are
available.
Only one
trigger
can be used.
Three options are available for the
first digit
in
Parameter
4.
0 -
Trigger on the first measurement
channel.
1 -
Digitaltrigger on single-ended'channel
one (1H).
2 -
Trigger on the first measurement
channel, set
Digitalcontrol port high
when
trigger is met and
low
when
measurements have
f
inished.
When triggering on
options 0 or 2, the
measurement on the
first specified channel
(Parameter
3)
is
compared to
the limit specified
in Parameter
8.
The user's multiplier and offset are not
applied before the comparison: the limit
must be entered in
millivolts.
lf
a
digital
trigger (CMOS levels, low
<
1.5V, high
>
3.5V)
is
used, it must
be input into single-ended Channel
1
(1H). The
digital
trigger condition
is
checked
at
the start of each scan.
Five trigger options are available and are
selected by
the number entered as the second
digit in Parameter
4:
0
-
trigger immediately,
start saving or sending data with the first
measurement made;
1 -
trigger
if
the
measurement is greater
than the limit entered or
if
the digital
trigger is high; 2
-
trigger
if
the
measurement is less than
the limit or
if
the
digital
trigger is low; 3
-
trigger on rising edge;
i.e., when
the measurement goes from below to
above
the limit or when the digital trigger goes
from
low
to high; 4
-
trigger on falling edge;
i.e.,
3pV
RMS. Thus,
only
the 50mV
9-9
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