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SECTION
9.
INPUT/OUTPUT INSTRUCTIONS
TABLE
9-1.
Input Voltage Ranges and Codes
Range Code
Slow
Fast
16.67ms 250ps
Integ.
Integ.
FullScale Range
Resolution
1
2
3
4
11
12
13
14
t5
millivolts
+15
millivolts
t50
millivolts
t500
millivolts
t5000
millivolts
0.33
microvolts
1.
microvolts
3.33
microvolts
33.3
microvolts
333.
microvolts
5t*
15*"
'
Differential measurement; resolution for single-ended measurement
is twice value shown.
**
The
lhtegration times for ranges
5
and
15
are
1.67ms and
251ts
respectively.
:
When
a
voltage input exceeds the range programmed, the value which
is
is set to
the maximum negative number and displayed as -99999 in high
or -6999 in low resolution.
01:
02:
03:
*** 1
SINGLE.ENDED
VOLTS
**'
FUNCTION
This instruction is used
to
measure
voltage at
a
single-
endep input with respect to ground.
Standard O(ttput (multiplier
=
1,
offset =
0) is
in
millivolts.
PARAM.
DATA
NUMBER
WPE
DESCRIPTION
2
Repetitions
2
Range code
2
Channel number for first
measuremenl
4
Input location for
first
measuremenl
FP
Multiplier
FP
Offset
Input locatidns
altered:
1
per
measurement
***
2
DIFFERENTIAL
VOLTS
*'*
FUNCTION
This instruclion reads the voltage difference
between
thQ
high and low inputs of a differential
channel. T4ble
9-1 contains
allvalid
voltage
ranges and
ltheir
codes.
Both
the high and low
inputs mustlbe
within
tSV
of the
21X's ground
(see
Commpn Mode Range in Section
13.2).
Pyranometer and
thermopile sensors require
a
jumper between LOW and GROUND to keep
them in Common Mode
Range.
Standard
Output (multiplier =1, offset =0) is in millivolts.
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
Repetitions
Range code
Channel number lor first
measurement
Input location for
first
measurement
Multiplier
Offset
Input locations
altered:
1
per measurernent
***
3
PULSE
COUNT
*"*
There are three pulse input types which may
be
measured with
the Pulse Count Instruction.
HIGH FREQUENCY PULSE
In
this configuration, the minimum
detectable pulse width
is
2 microseconds
i.e.
the maximum frequency
is
250 kHz with
a
5Oo/o
duty
cycle.
The
8
bit
counter has
a
maximum input
frequency
of
2550 Hz and
the 16 bit option a maximum of 250
kHz.
2
2
2
4
FP
FP
01:
02:
03:
o4:
05:
06:
04..
05:
06:
9-1
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