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參數(shù)資料
| 型號： | XTR108EA |
| 英文描述： | 4-20mA, TWO-WIRE TRANSMITTER Smart Programmable with Signal Conditioning |
| 中文描述： | 的4 - 20mA，兩線制變送器可編程智能與信號調(diào)理 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大?。?/td> | 497K |
| 代理商： | XTR108EA |
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XTR108
SBOS187B
20
www.ti.com
CALIBRATION PROCEDURE FOR RTD SENSORS
Step 1 Initial parameters calculation.
Using the procedure above, compute I
REF
, A
PGA
, I
ZERO
,
and G
LIN
based on T
MIN
, T
MAX
, and nominal values of
R
Z
, R
SET
, and R
VI
. Use the equation in Table XV to
calculate the DAC register values.
Configure the input MUX, write PGA gain, reference,
and offset DAC registers of the XTR108 with calcu-
lated settings. Note: write G
LIN
= 0 (no linearization) to
XTR108 at this step;
Step 2 Measurement.
Set RTD resistor value (or oven temperature) to mini-
mum scale, measure output signal I
MEAS1
;
Set RTD resistor value (or oven temperature) to maxi-
mum scale, measure output signal I
MEAS2
;
Step 3.
Calculate corrections using the following equations:
I
I
I
R
A
+
(
R
R
R
R
I
I
R
A
B
2
0 5
. –
G
B
R
B
R
B R
REF
MEAS
MEAS
VI
PGA
MAX
–
MIN
)
1
Z
MIN
ZERO
50
MEAS
VI
PGA REFA
LINA
V
V
MAX
V
MIN
ZA
A
A
=
(
)
(
)
=
=
+
(
)
(
)
2
1
50
0 5
.
2
–
–
–
–
I
I
I
G
R
(
R
R
A
R
R
I
I
I
I
I
AdjustedI
fineDAC Code N
N
round
I
R
V
I
I
I
A
REFB
OUTMAX
OUTMIN
50
LIN
A
MAX
ZA
VI
PGA
MAX
MIN
REF
REF
REFA
REF
REFB
(
REF
A
REF
SET
REF
ZERO
OUTMIN
ZERO
PGA REF
=
(
)
)
(
)
(
)
=
(
)
+
)
=
+
=
–
–
–
–
–
–
:
–
–
_
1
1024
50
10
10
B
R
MIN
ZA
VI
ZERO
A
ZERO
V
VI
REF
R
R
AdjustedI
fineDAC Code N
N
round
I
R
–
:
)
=
+
5
12
12
512
This takes into account resistor value deviations, all
offsets and gain errors of the coarse DACs and PGA. If
the adjusted abs(N
12A
) > 128 or abs(N
10A
) > 128, adjust
the coarse DAC first, then recalculate the fine DAC
value;
Update all the DAC register value, including lineariza-
tion DAC.
Step 4 (optional).
Measure output signal I
MEAS3
with maximum RTD value
still connected to the input from step 2;
Step 5 (optional).
Compute G
LIN
correction and update LinDAC register;
Step 6 (optional).
Make verification measurements at min- and max-input
signal; If linearity check is needed: make a measurement at
mid-scale; write EEPROM data.
Step 7.
Set the desired over-scale, under-scale signal limits and
sensor burnout indication configuration. Verify and adjust
the over-scale and under-scale levels by applying the posi-
tive and negative overdriving differential signals to the PGA
inputs.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XTR108EA/2K5 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XTR108EA/2K5G4 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XTR108EA-2K5 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA, TWO-WIRE TRANSMITTER a??Smarta?? Programmable with Signal Conditioning |
| XTR108EA-2K5G4 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA, TWO-WIRE TRANSMITTER a??Smarta?? Programmable with Signal Conditioning |
| XTR108EAG4 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
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