dacell DN-AM210 User manual
MODEL : DN-AM210
DYNAMIC STRAIN AMPLIFIER
USER’S MANUAL
DACELL CO.,LTD.
Address: 681-1, Cheoksan-Ri, Nami-Myeon, Cheongweon-Gun,
Chung-Buk, 363-810 Korea
TEL: 82-43-260-2242
FAX: 82-43-260-2245
http://www.dacell.com
1
CONTENTS
1. FOREWORD 2
2. SPECIFICATION 3
3. COMPOSITION 6
3-1. FRONT PANEL 6
3-2. BACK PANAL 6
3-3. DESCRIPTION …………… 7
4. HOW TO OPERATE 9
4-1. POWER CONNECTION9
4-2. SENSOR CONNECTION 9
4-3. INPUT HIGH LEVEL VOLTAGE 9
4-4. NOTES FOR SELECTING SENSOR CABLE 10
4-5. NOTES FOR DYNAMIC MEASUREMENT 10
4-6. NOTES FOR STATIC MEASUREMENT 11
4-7. Output CONNECTION 11
4-8. CONTROLLING PROPER SENSOR VOLTAGE 11
4-9. BRIDGE BALANCE 12
4-10. GAIN CONTROL 12
4-11. FILTER CONTROL 13
2
1. FOREWORD
Dynamic Strain Amplifier DN-AM210 is composed as the following features.
This device amplifies minute voltage signals of strain gauge type sensor or all types
of transducer to display and output as in voltage.
Shunt CAL feature is installed.
Electronic Auto Zero Balance method is used for Zero Span.
It is designed to install on standard 19”Sub rack.
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2. SPECIFICATION
①Measurement marks : 1CH / EA
②Measuring method : Deflection Method
③Working Gauge : 120, 350
④Gauge rate : 2.00
⑤Bridge voltage (B.V/V) : DC 1V, 2V, 5V, 7.5V, 10V
⑥Measuring range
Bridge Voltage Measuring range
10V…………………… 2000 strain
5V…………………… 4000 strain
2V…………………… 10000 strain
⑦Zero adjustment range
Automatic equilibrium control (Auto) :
- Gain 1000 : 115 % F.S
- Gain 400 : 115 % F.S
- Gain 100 : 115 % F.S
- Gain 10 : 28.6 % F.S
- Gain 1 : 19.8 % F.S
Hand-operated fine control (Zero): - Adjustment range : 5 % F.S
⑧Equilibrium control method
Automatic equilibrium control (Auto) : Push button
- Extent : 1%
- Time for pushing : about 1 second
- Data back up : semi-permanent
Passivity fine control (Zero ADJ) : Volume
⑨Output
OUT1 : 10V (more than 200load)
OUT2 : 10V (more than 2kload)
⑩Non-linearity : 0.01% F.S
⑪Calibration (CAL)
Extent : 1% F.S
1.0mV/V : 2000strain
0.1mV/V : 200strain Within 0.3% at error each point
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⑫Sensitivity adjustment (GAIN)
X1, X10,X100,X400, X1000 within 1% at error each point
(SPAN) X1 ~ X11 continuous variableness
(FINE) X1 ~ X2 continuous variableness
⑬S/N rate (Input conversion numerical value): more than 54dB (1kHz)
CMRR (Input conversion numerical value): more than100dB (1kHz)
⑭Response frequency characteristic
DC~20kHz (GAIN : 1000, Reduction : -3dB)
DC~10kHz (GAIN : 1000, Reduction : -0.1dB)
⑮Low Pass Filter
(L.P.F) Frequency : 10, 100, 1K, 10K, WB 5 stages
About decrease : within -6dB/oct
○
16 Temperature range for use
0 ~ +60C
○
17 Effect by temperature change
Zero drift: within 1 strain/C
Sensitivity change:0.03% F.S/C
○
18 Effect by electric power change (About 10% change in supply voltage)
Zero drift: within 0.05% F.S
Sensitivity change: within 0.05% F.S
○
19 Supply Voltage
AC100/220V 10% 60Hz
○
20 External Size and Weight
128.4 (H) ×43.2 (W) ×198 (D) mm
800g
○
21 OPTION
Output: OUT1 100mA output
5
3. Composition
3-1. Front Panel
○
1Power lamp
○
2Zero hand-operated control volume
○
3Zero auto control switch
○
4L.P.F switch
○
5GAIN control volume
○
6GAIN selecting switch
○
7CAL Strain value switch
○
8Power switch
○
9Bridge voltage selecting switch
3-2. Back Panel
⑩Sensor input connector
⑪High-current output (more than 200Ωload)
connector
⑫Low-current output (more than 2kΩload)
connector
⑬Internal CAL Bridge resistance selecting switch
○
14 Power input connector
6
3-3. Description
○
1Power lamp
This lamp shows you the power supply to Amplifier.
○
2Zero Hand-operated control volume
It is a volume to control the offset of residual quantity after finishing the auto
zero control.
Control range is within 1V.
○
3Zero auto control switch
Use this switch to carry out auto zero control.
When this auto switch is pressed, “Auto”will appear on the LED and then
zero will be set.
○
4L.P.F switch
It is a switch is to control the frequency of the active filter.
The frequency of Cut-off can be controlled as in 10Hz, 100Hz, 1kHz, 10kHz,
and WB(Wide-band).
○
5GAIN control volume
It is a volume to control GAIN and it can be continuously controlled as in 을
from X1 up to X11 times.
⑥GAIN selecting switch
It is the switch to control GAIN and it can be controlled as in X1, X10, X100,
X400, X1000 times.
⑦CAL Strain value switch
It is a shunt switch to calibrate the bridge in two different types - 200,and
200strain.
⑧Power switch
This switch is to supply power to Amplifier.
7
⑨Bridge voltage selecting switch
This switch is to select the bridge supply voltage.
You can make your selection for the supply voltage among DC 1V, 2V, 5V,
7.5V, 10V.
⑩Sensor input connector
You can use Strain gauge type sensor as well as Potentiometer Voltage input.
⑪High-current output (more than 200 Ωload) connector
It is the final output signal of Amplifier and also high-current output.
You can use this on more than 200Ωload.
⑫Low-current output (more than 2kΩload) connector
It is the final output signal of Amplifier and also low-current output.
You can use this more than 2kΩload.
⑬Internal CAL bridge resistance selecting switch
This switch is to select the bridge resistance while you are doing bridge
calibration.
⑭Power input connector
This connector is to supply external AC power.
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4. How to operate
4-1. Power connection
○
1Please only use the exclusive AC code (5-tube) for the power cord. When AC
is not grounded, please make the connection by using the ground connector
which is located on the backside of lamp.
○
2Please check the AC power selecting switch and then supply power to the
device. If the lamp is not lighted, please check the fuse and power selecting
switch.
4-2. Sensor connection
4 Gauge
Transducer
Full Bridge Connection
4-3. High Level Voltage Input
This device can measure the signal that inputted in DC (DCDT, High level,
Thermocouple etc).
For the measurement, following conditions should be satisfied.
○
1On Common mode, the amp input should be as 10V. Please be careful since
when over 10V is inputted, the signal source will be cut off.
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○
2When Thermocouple temperature sensor is used, an error in measurement can
be occurred since the temperature-electromotive force might be generated on
the commissure between the connector pin of amplifier and thermocouple lead
wire. Therefore, you should do the cold junction compensation or you should
carry out the measurement in the place where without such a big temperature
change.
○
3The input stage of amplifier are “+SIG”, “-SIG”. Since their minimum input
current is originated by this input impedance, it should be over 50nA to carry out
the measurement.
4-4. Notes for selecting sensor cable
The each space for selecting sensor cable should be:
○
1electrically isolated.
○
2Cable resistance should be small.
○
3The cable resistance of the internal lines should be regular.
○
4It is better to use the shield cable.
4-5. Notes for Dynamic measurement
Strain gauge or Transducer (located at the end of the measurement lead cable) is
exposed to various electric devices and equipment and also receive the analogue
frequency (50kHz, 60kHz) noise from the line power. Therefore, please carry out
the following procedures to minimize this kind of happening.
○
1Please prepare for the shield cable. (If the shield cable cannot be ready,
please make the lead cable as shortest as possible.)
○
2The shield cable should be connected to the ground and input connector.
○
3The cable resistance of the internal cables should be regular.
○
4It’s better to use the shield cable.
○
5All wires should be built in the clean environment for the measurement.
(Please avoid using transformer, motors, relay and high voltage cable where
the magnetic field can be easily generated. If it is necessary to use one of
them, please use any structure for the protection.)
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○
6If you use a long wire, please use a balanced leading line so that you can
minimize the noise.
4-6. Notes for Static measurement
You must make sure that the cable resistance between each gauge lead wire is
regular. If it is not, the measurement value can be changed by the surrounding
temperature. Please pay your special attention for this point.
Please carry out the following procedures.
○
1You must us 3-line for Quarter Bridge.
○
2To minimize the effect by the temperature change, it is ideal to put all the used
lead wire in the same wire bunch.
○
3To build the precise data when you use a long wire, please do the
compensation considering the resistance of lead.
(Example : The thickness, length of the wire and its proper resistance etc)
4-7. Output connection
Output 10V can read the voltage output value as in oscilloscope, volt meter
and A/D board on the output connector.
4-8. Controlling proper sensor voltage
Sometimes when you do the stress analysis, the high proper voltage to the active
gauge might be required. When the proper voltage is high, the output will be big
so that you do not have to amplify too much. But when the high voltage is applied
to the gauge with low resistance, an error in measurement can be occurred since
the joule heat might be generated on the gauge. So the most suitable condition
should be found since the resistance on the gauge and proper voltage are very
important. In addition to the gauge with high resistance (over 350Ω) or the long
and wide gauge, you can increase the proper voltage at the place where the
heat-sinking (aluminum etc) easily can be done.
Please avoid increasing the proper voltage with the gauge below 120Ωor at the
place where the heat-sinking cannot be done such as plastic.
Normally the gauge proper voltage should be 10%~100% of the recommended
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voltage from the gauge.
Maximum Metallic (foil) gauge can be normally 50% ~ 75% for the stability and
good S/N (signal to noise).
Exclusive voltage should be applied for the semi conductive gauge.
To control the sensor proper voltage of the amplifier, please turn the bridge
voltage switch.
4-9. Bridge balance
Generally, when the bridge balance is too much out, you cannot carry out the
measurement for the wide range since the measurement value will be clipped.
Also you should compensate the bridge balance since a damage can be made on
hardware.
For the compensation, please press the Auto switch on the front side of amplifier
then “Auto”will calibrate the balance automatically.
Please control the volume for the rest output voltage to set Zero.
4-10. GAIN control
Firstly, please turn the gain switch in a clockwise to set (X1, X10, X100, X400,
X1000) gain.
Or you can turn 10-turn volume so that you can control gain (X1 ~ X11).
The gain noise is originated by input voltage. So when the input voltage is
increased, the noise will be increased accordingly. So please set the gain
according to the size of sensor.
While you are carrying out stress analysis, please compensate as following so that
you can get the precise information. (in case 1 active gauge is used)
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10
4
K
AVVout B
Vout : Output voltage of amplifier
VB: Bridge proper voltage
A : Amplifier gain
K : Gauge factor
For the Transducer, please use the following formula by using the output value
you know.
12
EX) 2mV/V
3
10
KAVVout B
Vout : Output voltage of amplifier when the maximum output of transducer
is inputted
VB: Bridge proper voltage
A : Amplifier gain
K : Output sensitivity of transducer (mv/V)
For shunt compensation, error can be occurred by wiring, bridge resistance or
proper voltage while stress analysis is being done. So shunt compensation is
very important when you set the amplifier gain. Also when you use the analogue
transducer (force, torque and pressure etc), please fully understand the size of
transducer and the form of output so that you can select correct amplifier gain
accordingly.
4-11. Filter control
As standard, ST-AM210 has 2 pole standard low-pass filter installed.
Controllable switch is located on the front side of amplifier and the signal noise is
10Hz, 100Hz, 1kHz, 10kHz. Wide-band can be controlled by band pass. This cut-
off frequency is normally originated in 30% (-3dB) of output. For control, please
turn the rotary selector switch located on the front side of the amplifier.
L.P.F Characteristic
13
GAIN Band Width Characteristic
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