VTI Instruments Corp.
102
EX10xxA Programming
The
forward conversion polynomial
is used to convert a CJC temperature into a compensating cold
junction voltage and has the form of:
12
12
2
2
1
1
0
*
*
*
t
c
t
c
t
c
c
E
where
E
is in volts,
t
is in ºC, and
c
0
- c
12
are the coefficients.
The
inverse conversion polynomial
is used to convert a compensated input voltage into temperature
and has the form of:
12
12
2
2
1
1
0
*
*
*
E
d
E
d
E
d
d
t
where
E
is in volts,
t
is in ºC, and
d
0
- d
12
are the coefficients.
The coefficient sets are entered with the
accepts the following parameters:
an integer value of 9 or 10, corresponding to the EU conversion type (User0 or User1,
respectively) to which the entered coefficients are assigned
an array of forward conversion polynomial coefficients
an integer value corresponding to the length of the forward coefficients array
an array of inverse conversion polynomial coefficients
an integer value corresponding to the length of the inverse coefficients array
Coefficients that are not specifically defined are automatically set to 0. The current values for each
coefficient set are queried with the
query.
NOTE
The entry of user-defined coefficients does not automatically enable their use. The enabling is done
by setting the EU conversion to User0 or User1.
C
ONFIGURE THE
V
OLTAGE
M
EASUREMENT
C
HANNELS
The EX10xxA voltage channel can be configured to perform either general purpose voltage
measurement or thermocouple measurement. When they are used for the thermocouple
measurement, the user can use the same EU conversion functions. However, the user must use either
the user CJC temperature functionality or must connect an external thermistor to the voltage
connector (see
for more information) when using temperature EUs.
To use these channels for the general purpose voltage measurement, the user must set the EU
conversion to VTEX10XXA_CONV_MV using
vtex10xxA_set_channel_conversion
The measurement data is returned in units of volts by default, however, custom engineering units
can be created using a linear transform specified by the
vtex10xxA_set_linear_correction
function.
C
ONFIGURE THE
F
ILTER
F
REQUENCIES
The hardware filter for each channel is configured with the
function. A
channel’s hardware filter can be configured regardless of its inclusion in the scan list, and multiple
channels can be assigned to a specific filter frequency within one function. However, each unique
filter frequency must be set with a separate function.
Содержание EX1000A
Страница 25: ...www vtiinstruments com EX10xxA Introduction 25 FIGURE 1 2 RACKMOUNT HARDWARE INSTALLATION DIAGRAM ...
Страница 27: ...www vtiinstruments com EX10xxA Introduction 27 FIGURE 1 4 ISOMETRIC AND INTERNAL CJC PLATE DIAGRAM ...
Страница 28: ...VTI Instruments Corp 28 EX10xxA Introduction EX1044 DIAGRAM ...
Страница 29: ...www vtiinstruments com EX10xxA Introduction 29 FIGURE 1 5 EX1044 TABLE TOP USAGE ...
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