Dewetron DAQP-STG Product manual

ISO9001
DAQP-STG Module
www.dewetron.com
Technical reference manual
Automotive
Energy & Power Analysis
Aerospace
Transportation
General Test & Measurement

Copyright © DEWETRON elektronische Messgeraete Ges.m.b.H.
This document contains information which is protected by copyright. All rights are reserved. Reproduction,
adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.
All trademarks and registered trademarks are acknowledged to be the property of their owners.

3
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
Notice
General Information, Safety Instructions
The information contained in this document is subject to change without notice.
DEWETRON elektronische Messgeraete Ges.m.b.H. (DEWETRON) shall not be liable for any errors
contained in this document. DEWETRON MAKES NO WARRANTIES OF ANY KIND WITH REGARD
TO THIS DOCUMENT, WHETHER EXPRESS OR IMPLIED. DEWETRON SPECIFICALLY DISCLAIMS
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
DEWETRON shall not be liable for any direct, indirect, special, incidental, or consequential damages,
whether based on contract, tort, or any other legal theory, in connection with the furnishing of this document
or the use of the information in this document.
Warranty Information:
A copy of the specic warranty terms applicable to your DEWETRON product and replacement parts can be
obtained from your local sales and service ofce.
Restricted Rights Legend:
Use austrian law for duplication or disclosure.
DEWETRON GesmbH
Parkring 4
8074 Graz-Grambach
Austria
Printing History:
Version 2.1.2
Released March 28, 2006
Copyright © 1998 - 2006 DEWETRON GesmbH
This document contains information which is protected by copyright. All rights are reserved. Reproduction,
adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright
laws.
All trademarks and registered trademarks are acknowledged to be the property of their owners.

4
Notice
Safety symbols in the manual
Indicates hazardous voltages.
WARNING Calls attention to a procedure, practice, or condition that could cause bodily
injury or death.
CAUTION Calls attention to a procedure, practice, or condition that could possibly cause
damage to equipment or permanent loss of data.
WARNINGS
The following general safety precautions must be observed during all phases of operation, service, and
repair of this product. Failure to comply with these precautions or with specic warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of the product. DEWETRON
Elektronische Messgeraete Ges.m.b.H. assumes no liability for the customer’s failure to comply with these
requirements.
All accessories shown in this document are available as option
and will not be shipped as standard parts.

5
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
Safety Instructions
Safety instructions for DEWETRON ampliers
The DEWETRON data acquisition systems and ampliers may only be installed by experts.
Read your manual carefully before operating.
Observe local laws when using the ampliers.
Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), a
non interruptible safety earth ground must be provided from the mains power source to the product input
wiring terminals or supplied power cable.
DO NOT operate the product in an explosive atmosphere or in the presence of ammable gases
or fumes.
DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built
into this product have been impaired, either through physical damage, excessive moisture, or any other
reason, REMOVE POWER and do not use the product until safe operation can be veried by service-
trained personnel. If necessary, return the product to a DEWETRON sales and service ofce for service
and repair to ensure that safety features are maintained.
Keep away from live circuits: Operating personnel must not remove equipment covers or shields.
Procedures involving the removal of covers or shields are for use by service-trained personnel only.
Under certain conditions, dangerous voltages may exist even with the equipment switched off. To avoid
dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless you
are qualied to do so.
No modications are allowed at the ampliers.
DO NOT service or adjust alone. Do not attempt internal service or adjustment unless another person,
capable of rendering rst aid and resuscitation, is present.
DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards,
do not install substitute parts or perform any unauthorized modication to the product. Return the product
to a DEWETRON sales and service ofce for service and repair to ensure that safety features are
maintained.
DO NOT touch internal wiring!
DO NOT use higher supply voltage than specied!
Use only original plugs and cables for harnessing.
Safety of the operator and the unit depend on following these rules.

6
Support
For any support please contact your local distributor rst or DEWETRON directly.
For Asia and Europe, please contact:
DEWETRON Ges.m.b.H.
Parkring 4
A-8074 Graz-Grambach
AUSTRIA
Tel.: [phone]
Fax: [phone]
Email: [email protected]
Web: http://www.dewetron.com
The telephone hotline is available Monday to Friday between 08:00 and 12:00 CET (GMT -1:00) and Monday
to Thursday between 13:00 and 17:00 CET.
For the Americas, please contact:
DEWETRON, Inc.
10 High Street, Suite K
Wakeeld, RI 02879
U.S.A.
Tel.: [phone]
Toll-free: [phone]
Fax: [phone]
Email: [email protected]
Web: http://www.dewamerica.com
The telephone hotline is available Monday to Friday between 08:00 and 17:00 GST (GMT +5:00)

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DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
General Module Information
9-pin male SUB-D connector
Interface pin assignment:
1 Module output (±5 V)
2 RS-485 (A)
3 RS-485 (B)
4 GND
5 +9 V power supply
6 +12 V power / sensor supply
7 Module input (from D/A
converter of the A/D board)1)
8 reserved
9 -9 V power supply
1) Triggerout at DAQP-FREQ-A
Calibration information
All DEWETRON modules are calibrated at 25 °C after a warmup time of 30 minutes and meet their
specications when leaving the factory.
The time interval for recalibration depends on environmental conditions. Typically, the calibration should be
checked once a year.
Calibration certicates are available from DEWETRON as an option. DEWETRON offers two types:
ISO traceable DEWETRON certicate
Calibration certicate according to ÖKD (equivalent to DKD)
This manual contains no calibration information. For self calibration, there is a separate calibration kit for the
DAQ series modules available. The CAL-KIT contains the required cables, software and instructions.
General module specications
Module dimensions: 20 x 65 x 105 mm (0.79 x 2.56 x 4.13 in.)
(W x H x D without front cover and connectors)
Frontcover: 20 x 87 x 2 mm (0.79 x 3.43 x 0.08 in.)
(W x H x D without connector)
Environmental:
Temp. range storage: -30 °C to +85 °C (-22 °F to 185 °F)
Temp. range operating: -5 °C to +60 °C (23 °F to 140 °F)
Relative humidity
(MIL202): 0 to 95 % at 60 °C, non-condensing
RFI susceptibility: ±0.5 % span error at 400 MHz, 5 W, 3 m
All specications within this manual are valid at 25 °C!
All modules are produced according ISO9001 and ISO14001.
Module connectors
Frontpanel connector: Accessable to the user. The connector type and pin assignment varies
from module to module. Detailed pin assignment of each module is
shown in the appropriate module description.
Rear connector: 9-pin male SUB-D, interface to the DEWE-System, not accessable to the user.
DAQx and PAD module
rear view

8
DEWETRON
data acquisition
system
RS-232/485
conversion on
DEWETRON-
motherboard
DAQx or PAD
module
RS-232
interface
RS-485
businterface
RS-232/485 interface
DAQP modules can be congured via
RS-485 interface, PAD modules require
this interface for all data transfers.
For all DEWETRON systems, an internal
RS-232/485 converter is available
(standard with DEWE-800, -2000, -2500, -3000, -4000, -5000 series systems). This converter allows
communication with DAQP and PAD modules.
To communicate with the modules, the RS-232 interface has to be set to the following parameters:
baud rate: 9600 bps
data bits: 8
parity: no parity
stop bits: 1
handshake: not required
DAQP module conguration
1. Push button selection
All ranges and lters can be selected directly by pressing the push buttons on the module. Approx. 15 sec.
after changing range and / or lter, the range and lter information is stored in an EEPROM. This procedure
increases the livetime of the EEPROM.
The current input range setting is shown all the time by LED. To change the range just press RANGE button
a few times until the required range is displayed.
To see the current lter setting just press the FILTER button once. The corresponding LED is ashing for
approx. 3 seconds. Within this time, the lter can be selected by pressing the FILTER button again. Approx.
3 seconds after the last key activity, the information will be stored, the LED stops ashing and shows the
input range again.
CAUTION: Power loss during this time leaves the module in the former settings.
2. RS-232/485 programming
All ranges and lters can also be selected via RS-232/485 interface. All new DEWE-800, -2000, -2500,
-3000, -4000, -5000 series systems are prepared as a standard to work with DAQP modules.
The easiest way to change the conguration is to use the DEWECong software, which comes as a standard
with the DEWETRON data acquisition system.
Detailed information about DAQP modules programming for customer applications is available in the DEWE-
Modules Programmers Reference Manual.
CAUTION: All range and lter changes which are done via RS-232/485 interface are not stored in the
EEPROM of the DAQP modules! You have to store this information in a separat initialisation le to keep
settings information for next system start!
PAD module communication
All PAD modules are only working through the RS-232/485 interface. All new DEWE-800, -2000, -2500,
-3000, -4000, -5000 series systems are prepared as a standard to work with PAD modules. The easiest
way to change the conguration is to use the DEWECong software, which comes as a standard with the
DEWETRON data acquisition system.
Detailed information about PAD modules programming for customer applications is available in the
DEWE-Modules Programmers Reference Manual.
General Module Information

9
DAQP-STG
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
Isolated strain gage amplier
Input ranges: 0.05 mV/V to 1000 mV/V; 500 µV to 5 V; 25 mOhm to 100 kOhm
Bandwidth: 300 kHz, 9 selectable low pass lter (10 Hz to100 kHz)
Isolation: 350 VDC
Bridge completion: Internal completion for ½ and ¼ bridge (120 and 350 Ohm)
Shunt: Two internal shunts (59.88 kOhm, 175 kOhm)
Bridge Excitation: 0 to 12V or 0 to 20mA 16 bit programmable
TEDS: Support for TEDS sensors and DEWETRON MSI series
Module specications
DAQP-STG
Gain: 0.5 to 10 000
Voltage Input ranges:
Sensitivity @ 5 VDC excitation:
±0.5 , ±1, ±2.5, ±5, ±10, ±25, ±50, ±100, ±250, ±500 mV, ±1 V, ±2V, ±5 V,±10 V
±0.1 , ±0.2, ±0.5, ±1, ±2, ±5, ±10, ±20, ±50, ±100, ±200, ±400, ±1000 mV/V
Resistance: 25 mOhm to 100 kOhm
Input impedance: >100 MOhm (power off: 50 kOhm)
Input noise: 3.5 nV * √Hz
Voltage Input Accuracy:
Gain drift:
Offset drift:
linearity:
±0.05 % of reading ± 0.02 % of range ±10 µV
typical 10 ppm/°K max. 20 ppm/°K
typical 0.3 µV/°K + 10 ppm of range, max 2 µV/°K + 20 ppm of range
typical 0.02 %
Excitation voltage:
Accuracy:
Drift:
Current limit
Protection:
0, 0.25, 0.5, 1, 2.5, 5,10 and 12 VDC software programmable (16 Bit DAC)
±0.03 % ±1 mV
±10 ppm/K ±50 µV/K
100 mA
Continuous short to ground
Excitation current:
Accuracy:
Drift:
Compliance voltage:
Output impedance:
0.1, 0.2, 0.5, 1, 2, 5, 10 and 20mA software programmable (16 Bit DAC)
0.05% ±2µA
15ppm/°K
12V
>1 MOhm
Supported Sensors: 4- or 6-wire full bridge
3- or 5-wire ½ bridge with internal completion (software programmable)
3- or 4-wire ¼ bridge with internal resistor for 120 and 350 Ohm (software programmable)1)
4-wire full bridge with constant current excitation (piezoresistive bridge sensors)
Potentiometric
Resistance
Resistance Temperature Detection: PT100 PT200 PT500 PT1000
Bridge resistance: 80 Ohm to 10 kOhm @ ≤ 5 VDC excitation
Shunt calibration: Two internal shunt resistors 59.88 kOhm and 175 kOhm
Shunt and completion resistor accuracy: 0.05% ±15ppm/°K
Automatic bridge balance: Input range 500µV to 1V: ±200 % of Range
2.5V to 5V : ±40% of Range
Bandwidth (-3dB): 300 kHz
Filters (low pass): 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz (±1.5 dB @ f0)
Filter characteristics:
10Hz to 100Hz: Butterworth or Bessel 40 dB/dec ( 2nd order)
300kHz: Bessel 60 dB/dec (3rd order)
Typical SNR @ 100 kHz [1 kHz]
and 5 VDC excitation:
66 dB [84 dB] @ 1 mV/V
82 dB [100 dB] @ 50 mV/V
Typical CMRR @ 0.1 mV/V [1 mV/V]
and 5 VDC excitation:
160 dB [160 dB] @ DC
115 dB [110 dB] @ 400 Hz
110 dB [105 dB] @ 1 kHz
Isolation ±350 VDC continuous (for input, excitation and TEDS interface)
Common mode Voltage ±350 VDC input to housing
Over voltage protection: ±50 VDC input (+) to input (-)
Output voltage: ±5 V
Output resistance: < 1 Ohm
Output current: Max. 5 mA; short to ground protected for 10 seconds
RS-485 interface: Yes
Supported TEDS chips DS2406, DS2430A, DS2431, DS2432, DS2433
MSI support: MSI-BR-TH-x, MSI-BR-ACC, MSI-BR-V-200 ,MSI-BR-CH-50
Power supply voltage: ±9 VDC (±1 %)
Power consumption: Typ. 1.7 W @ 350 Ohm, 2.15 W @ 120 Ohm (both full bridge @ 5 VDC excitation)
Absolute max.: 3 W (maximum excitation @ maximum current)

10
DAQP-STG
IN+
IN-
500 µV
.
.
10 V
Σ
16 Bit
OFFSET
DAC
CAL
Signal
Va riable
Gain
Amplifier
x 1..100
Input
Amplifier
x 1
x 20
1 MHz anti-
aliasing filter
Galvanic
signal
isolation
3rd order
Bessel filter
350 kHz
2nd order
lowpass filter
(BE or BU)
10 Hz to 100 kHz
or off
x 5
ISOLATED BRIDGE AMPLIFIER
±5 V out
Programmable
Gain
Amplifier
x 0.1
x 1
{
Half bridge
completion
1
2
3
4
3 2 1
1
2
3
IN+
IN-
1
6
5
2
7
4
9
3
8
J1
J2
9-pin SUB-D
9
1
4
5
TEDS
Quarter bridge
completion
INPUT CONNECTOR
EXC+
SENSE+
R+
IN+
IN-
GNDisolated
TEDS
SENSE-
EXC-
350 Ω
175 kΩ
59.8 kΩ
CUSTOM
120 Ω
1 kΩ1 kΩ
HB
HB
S+
E+ E-
S
+
E
+
E
-
Self test
curcuit Programmable
Excitation
Programmable
constant current
DC
DC
GNDisolated
OUTPUT CONNECTOR
Σ
16 Bit
OFFSET
DAC
CAL
Signal
Variable
Gain
Amplifier
x1..100
Input
Amplifier PGA
x0.1
x1
x1
x20
1 MHz anti-
aliasing filter
Galvanic
signal
isolation
3rd order
Bessel filter
350 kHz
2nd order
lowpass filter
(BE or BU)
10 Hz to 100 kHz
or off
x5
ISOLAT ED BRIDGE AMPLIFIER
9-pin SUB-D
-9 V
+5 V
GND
+9 V
IN+
IN-
{
{
Internal shunt
resistor
{
Shunt-routing
network
J1
J2
4
3
2
1
Front panel control
LED indication:
Power LED: This LED is always on when the module is supplied.
Status LED: This LED is ashing three times when the Module receives a valid command.
Push button operation
Module readdressing: Press the ID button for allowing the software to change the address.
Input blockdiagram
Isolated amplier blockdiagram and DEWESoft interface

11
DAQP-STG
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
Amplier functions
Input range overview
Voltage Strain gage Resistance Current source bridge
Excitation 0.25 V 0.5 V 1 V 2.5 V 5 V 10 V 12 V 0.1 mA 0.2 mA 0.5 mA 1 mA 2 mA 5 mA 10 mA 20 mA
Input
range Range Range
mV mV/V mV/V mV/V mV/V mV/V mV/V mV/V Ohm* Ohm* Ohm* Ohm* Ohm* Ohm* Ohm* Ohm*
10000 40000 20000 10000 4000 2000 1000 833.3 1E+05 50000 20000 10000 5000 2000 1000 500 ±20 % offset
adjustment
5000 20000 10000 5000 2000 1000 500 416.7 50000 25000 10000 5000 2500 1000 500 250
2000 8000 4000 2000 800 400 200 166.7 20000 10000 4000 2000 1000 400 200 100
1000 4000 2000 1000 400 200 100 83.33 10000 5000 2000 1000 500 200 100 50
±200 % offset
adjustment
500 2000 1000 500 200 100 50 41.67 5000 2500 1000 500 250 100 50 25
250 1000 500 250 100 50 25 20.83 2500 1250 500 250 125 50 25 12.5
100 400 200 100 40 20 10 8.333 1000 500 200 100 50 20 10 5
50 200 100 50 20 10 54.167 500 250 100 50 25 10 5 2.5
25 100 50 25 10 5 2.5 2.083 250 125 50 25 12.5 5 2.5 1.25
10 40 20 10 4 21 0.833 100 50 20 10 5210.5
5 20 10 5210.5 0.417 50 25 10 5 2.5 10.5 0.25
2.5 10 5 2.5 10.5 0.25 0.208 25 12.5 5 2.5 1.25 0.5 0.25 0.125
1 4 21 0.4 0.2 0.1 0.083 10 5210.5 0.2 0.1 0.05
0.5 2 10.5 0.2 0.1 0.05 0.042 5 2.5 10.5 0.25 0.1 0.05 0.025
not usefull in strain gage mode
Resistance mode
*) Ohm = mv/mA
Free variable gain and excitation
The gain, excitation and offset values of this module are free programmable. So it is possible to normalize
any physical sensor input signal to the ±5V output of the module. By using these settings as power on
default, standalone solutions could be easily realized.
Gain: from 0.5 to 10000. The module input ranges are based on predened gain values. The module
automatically chose the best gain combination of the internal ampliers to keep the overall noise and drift
as low as possible.
Output offset: Could be programmed from the positive to the negative full scale range except on the
input ranges above 1V. Due to internal structure here the offset could be set from +20 % to – 20 %.
Excitation Voltage: The excitation voltage is programmable from 0 to 12 V in 185 µV steps. Setting the
excitation to 0 V for example allows you to determine the noise of the sensor cabling. The sense
terminals have to be connected to the excitation terminals all the time. Even if the remote sensing is not
required.
Excitation current: The current could be programmed from 0.1 mA to 20 mA in 0.3 µA steps. The
maximum compliance voltage is 12 V. The compliance voltage is automatically balanced around the
internal GND. This minimizes the common mode error.
Power On Default function
You can store the actual settings of the module in the internal EE-Prom memory. Once the module restarts,
it comes up automatically with these setting. This is important for stand alone applications and for fail save
reasons.
Filter
The Module has 9 selectable low pass lters from 10 Hz to 100 kHz. The lter characteristic could chosen
between Butterworth 2nd order or Bessel 2nd order. The highest lter is a 3rd order Bessel lter with a
guaranteed -3 dB bandwidth of 300 kHz. This lter structure is the same for all new generation modules
(DAQP-LV, DAQP-HV2) to have low phase shifts between the different module times over the frequency
range.

12
DAQP-STG
Amplier balance
The amplier balance allows eliminating automatically all internal amplier offsets. It switches the differential
amplier inputs IN+ and IN- to the internal isolated GND reference point. Then the output offset of the
module is automatically adjusted to zero for all ranges. This function takes up to 8 seconds. Automatically
previous stored sensor offset values are cleared.
Sensor Balance
Typically every strain gage sensor has a certain offset. That comes from manufacturing tolerances or
because of sensor mounting. By performing a bridge balance this sensor offset could be completely removed
on the analog side up to 200 % of the actual range. This allows using the full dynamic of the AD-board
instead of losing resolution because of digital offset shifting. Output offset and sensor balance may not
exceed 200 % of range (20 % for ranges above 1 V).
Internal Completion Resistors
The DAQP-STG has an internal half bridge completion and two internal quarter bridge completions for 120
Ohm and 350 Ohm strain gages. The used high precision resistors with low temperature drift allow a long-
time stable measurement of almost every strain gage type without using an external completion network.
Internal Shunt
With two internal shunt resistors (59.88 kOhm and 175 kOhm) and one spare socket for a customised shunt,
the DAQP-STG has wide exibility in case of shunt calibration. A jumper network gives the possibility to
connect the internal shunts to either Sense+ Sense – IN+ or IN- to be compatible to existing sensor types
and correction calculation methods. This technology is used to correct the complete measurement chain
gain error from the sensor input to the digital signal output. It is based on the known ratio between the shunt
resistor and the strain gage resistance.
Short
It switches the differential amplier inputs IN+ and IN- from the input terminals to the internal isolated GND
reference point. With this function the absolute sensor offset could be determined.
CAL
It applies a high precision internal reference signal with 80% of the full scale value to the module. For ranges
above 1V the reference signal level is 20 % of range.
Self Test
The self test function is a software controlled procedure that checks in the rst step the amplier itself. In the
second step a basic sensor check will be performed. This test is only available in DeweSoft if an AD-Card is
installed.
Part 1: Amplier Test
The amplier offset is checked by using the Short function
The 80% Cal signal is applied to the amplier. The complete isolation amplier including the AD-Card is
checked by using this test signal.
The self test circuit switches the amplier input to the positive excitation voltage, so also the input
amplier is checked. Warning: if there is a short circuit on the excitation this test will fail.
Part 2: Basic Sensor Test
Bridge Sensor: It is checked if the supply current doesn’t exceed the maximum value, and if the
excitation voltage is within the predened value.

13
DAQP-STG
EXC+
Sense+
R+
1)
IN+
Sense-
EXC-
IN-
Shield
1
6
5
2
3
8
7
4
9-pin SUB-D
TEDS
GND
9
4
TEDS
Data
GND
EXC+
Sense+
R+
1)
IN+
Sense-
EXC-
Shield
1
6
5
2
3
8
9-pin SUB-D
4
TEDS
GND
9
4
TEDS
Data
GND
Potentiometric Sensor
200 Ohm to 10 kOhm
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
1 EXC+
2 IN+
3 Sense -
4 GND
5 R + / Shunt
6 Sense +
7 IN-
8 EXC-
9 TEDS
Signal connection
DAQP-BRIDGE-B module
Signal connection via SUB-D connector
Full bridge signal connection
6-wire and 4-wire sensor connection
Voltage or Current excitation is allowed.
Senses terminals have to be connected to the excitation also when 4-wire connection is used.
6-wire sensor connection: Sense+ is connected to EXC+ at the sensor
4-wire sensor connection: Sense+ is connected to EXC+ at the connector
Half bridge signal connection
5-wire and 3-wire sensor connection, potentiometric sensors
Voltage or Current excitation is allowed.
Senses terminals have to be connected to the excitation also when 4-wire connection is used.
A potentiometer can be seen similar to a half bridge sensor with ±500 mV/V sensitivity. Therefore
potentiometric sensors can be measured with bridge ampliers. The advantages of using the DAQP-STG for
potentiometric measurements is by adjusting the offset and range, you can focus on a certain potentiometer
position with higher resolution. The scaling is ±500 mV/V equals ±50 % of potentiometer position.
1) 'R+' has to be connected only if shunt calibration is required, otherwise it can be left unconnected.
5-wire sensor connection: Sense+ is connected to EXC+ at the sensor
3-wire sensor connection: Sense+ is connected to EXC+ at the connector
4-wire connection
6-wire connection
3-wire connection
5-wire connection

14
DAQP-STG
EXC+
Sense+
R+
IN+
Sense-
EXC-
Shield
1
6
5
2
3
8
9-pin SUB-D
4
TEDS
GND
9
4
TEDS
Data
GND
EXC+
Sense+
Sense-
EXC-
Shield
1
6
3
8
9-pin SUB-D
4
IN-
IN+
2
7
EXC+
Sense+
R+
IN+
Sense-
EXC-
Shield
1
6
5
2
3
8
4
9-pin SUB-D
TEDS
GND
9
4
TEDS
Data
GND
4-wire sensor connection
(Sense+ is connected to EXC+ at the sensor)
Resistance, RTD 2-wire and 4-wire
Sense leads (SUB-D: pin 3 and 6) have to be connected!
3-wire sensor connection
(Sense+ is connected to EXC+ at the connector)
Quarter bridge signal connection
The 3-wire quater bridge is only able to compensate symmetric wire resistance!
In the quarter bridge 4-wire mode the DAQP-STG internally adjusts its excitation in that way, that on the gage
the resistor terminals exactly on the half of the excitation voltage. All wire resistances are compensated.
For resistance and RDT mode the 4-wire connection is recommended. The 2-wire connection will not
compensate the wire resistance.
2-wire connection
4-wire connection

15
DAQP-STG
IN+
2
9-pin SUB-D
TEDS
GND
isolated
7
4
SENSOR
EXC+
Sense+
IN+
Sense-
EXC-
TEDS
1
6
2
3
8
9-pin SUB-D
9
4
GND
IN-
TEDS
7
V+
OUT+
OUT-
V-
Sensor with
differential output
TEDS
V+
Signal
OUT
GND
Sensor with
single ended
output
DE-M061103E • DEWE-Modules Technical Reference Manual • Printing version 2.2.3 • May 15, 2009
Voltage measurement and μV measurement
Sensor with sensor supply and voltage output
If the excitation is not used for sensor supply it has to be deactivated by setting it to 0 V. This will internally
connect the IN- to the GNDisolated to improve the common mode rejection.
Why to use more wire technology
Sensitivity: For sensor wiring typically copper cables are used. For example a 120 Ohm full bridge
connected with a 4 x 0.14 mm² cable will have an sensitivity error of 2.1 % just because of the 1.27 Ohm
wire resistance. With the 6 wire technology this could be completely compensated.
Temperature drift:
Initial error Drift because of 10 °C warm-up
Offset Sensitivity Offset Sensitivity
2-wire 25183 μm/m -4.97 % 956 μm/m -0.18 %
3-wire 0 μm/m -2.6 % 0 μm/m -0.01 %
4-wire 0 μm/m 0.0 % 0 μm/m 0.00 %

16
DAQP-STG
Cables and Shielding
To keep the inuence of electromagnetic disturbances as small as possible, shielded twisted pair cables are
recommended. Connect the shield to the isolated GND (Pin4) to get the best result.
The twisted pairs for full bridge, half bridge ,voltage and resistance mode are:
EXC+ PIN1 and EXC- PIN8
Sense+ PIN6 and Sense- PIN3
IN+ PIN2 and IN- PIN7
R + PIN5 and GNDisolated PIN4
If TEDS is used also the shield could be used as GNDisolated
For quarter bridge mode:
IN+ PIN2 and Sense- PIN3
R + PIN5 and EXC- PIN8
Supported MSI
MSI-BR-TH
MSI-BR-ACC
MSI-BR-CH-50
MSI-BR-RTD