GRAPHTEC Data Platform GL7000 Manuale utente

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DC Strain Module

GL7-DCB

DATA PLATFORM GL7000

Contents

1. Outline and Basic Connection for the GL7-DCB module P. 1

3. Setting the GL7-DCB, Using Strain Gauges P. 5

4. Setting the GL7-DCB, Sensor Usages P. 14

5. Setting the GL7-DCB, Measuring Voltage P. 25

Channel Isolation and

Accurate Measurement

DC Strain Module [GL7-DCB]

Study Guide for GL7000

Signal conditioner for the GL7000 corresponding with the

sensors using strain gauges.

- Technical guide for measuring [GL7-DCB]Amplifier.

2. Setting the GL7-DCB, Set measurement types

6. Setting the GL7-DCB, Measuring Resistance P. 30

P. 4

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 1 -

Strain gauge

Load-cell

Acceleration sensor

Control board

Sensors

(Voltage output type)

Thermistor

Potentiometer

Measuring micro distortion (strain)

Measuring output of sensor

Measuring voltage

Measuring resistance

Types of sensors Types of measurements

1. Outline and Basic Connection for the GL7-DCB module (1/3)

The DC strain module GL7-DCB amplifier is the signal conditioner for the GL7000 data platform. It offers isolated 4 channel input, corresponding

bridge amp for the strain gauge sensor, and supports voltage and resistance measurement. Input signal type can be set individually for each

channels.

• Incorporates elements (120/350 ohms) for bridge circuit, simple to measure micro distortion levels using strain gauges.

• Incorporates the excitation power source for the sensor.

• Supports TED corresponding sensors.

• Supports precision measurement using noise reduction techniques including low-pass and anti-aliasing filter.

• Supports remote-sensing and the shunt calibration to measure high accurate readings.

DC Strain Module

GL7-DCB (4ch / unit)

Other sensors

(Based on strain gauge) Input signal type

can be configured

individually for each

channels.

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GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 2 -

1. Outline and Basic Connection for the GL7-DCB module (2/3)

The input terminal of the DC strain module GL7-DCB is a rectangle connector (D-Sub serial 9-pin).An adapter for the circular connector (NDIS

type) and screw terminals are available for quick plug-and-play connection. Configuration of wiring will vary by the type of signals and sensors.

Screw terminal adapter

(Option B-650)

NDIS connector adapter

(Option B-651)

Rectangular connector (D-Sub 9-pin)

(Standard accessory)

Signal assignment of input connector

Input connector

pin number Signal

symbol Description Screw terminal

(B-650) NDIS connector

(B-651)

1 B- Excitation voltage (-) 1 C

2IN- Input signal (-) 2 B

3S+ Sense (+) 3 N/A

4 T- TEDS (-) 4 G

5R+ Shunt resistance 5 N/A

6 S- Sense (-) 6 N/A

7 IN+ Input signal (+) 7 D

8B+ Excitation voltage (+) 8 A

9T+ TEDS (+) 9 F

Shell N/A Shield FG E

Input terminals

(for Strain, Voltage, Resistance)

Type: Rectangle connector (D-Sub

Serial 9-pin)

Switches to configure the input

channel by signal types and number

of gauges, etc.

Accessory for input terminal

Wires from the sensor needs to be soldered to

the connector. (Connection diagram varies by

the type of sensor.)

When sensor has cable with the circular

connector (NDIS type), you can use the B-651

option.

Wires from the sensor are fixed to terminal

screw when this adapter is used.

Rectangular (D-Sub type)

connector (Plug, Male)

NDIS connector

(pin assignment)

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 3 -

1. Outline and Basic Connection for the GL7-DCB module (3/3)

Setting of switch to set the input channel configuration

Type of measurement Configuration Used the 120 ohms strain gauge Used the 350 ohms strain gauge

1 2 3 4 5 6 7 1 2 3 4 5 6 7

Measuring micro distortion using

strain gauge

Single gauge, 2 wires 1 1 1 1 1 1 1 1 1 1 1 1 0 0

Single gauge, 3 wires 1 1 0 0 1 1 1 1 1 0 0 1 0 0

Single gauge, 4 wires 1 1 0 0 1 1 1 1 1 0 0 1 0 0

Dual gauge, 3 wires 0 1 0 1 1 1 1 0 1 0 1 1 0 0

Dual gauge, 4 wires 0 1 0 1 0 1 1 0 1 0 1 0 0 0

Dual gauge, 5 wires 0 1 1 1 0 1 1 0 1 1 1 0 0 0

4 gauges, 4 wires 0 0 0 1 1 1 1 The 350 ohms strain gauge cannot be

used.

4 gauges, 6 wires 0 0 1 1 0 1 1

Measuring the output of a strain

gauge-based sensor

(ex. load cell)

4 wires 0 0 0 1 1 1 1 Use setting shown in left side.

6 wires 0 0 1 1 0 1 1

Measuring direct voltage or resistance 0 0 0 1 1 1 1 Use setting shown in left side.

The input of each channels can be configured by the settings using the switch. This switch needs to be set according to the type of measurement

and configuration of the sensors connected to the GL7-DCB module.

Measuring direct voltage or direct resistance

Measuring an output of a sensor based on the strain gauge

(Load-cell, Accelerometers, or other sensors)

Measuring micro distortion using strain gauge

When voltage or resistance is measured, switches needs to be set as shown

below.

When the output of the sensor is measured, switches are set according to the

configuration of sensor you see below.

When strain gauges are used, the switches are set according to the type of their

sensor. The bridge circuit required to use the strain gauge is configured by the

changing the settings on the switch mechanism.

Switch for configuring input channel.

(Located on front panel)

ON: 1

OFF: 0

Sensor, 4 wires type Sensor, 6 wires type

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 4 -

Type Description

Strain gauge Micro distortion (strain) measurement using the strain gauge

Strain sensor Sensor output measurement (using strain gauges inside sensors)

(ie) Load Cell, accelerometer.

DC Voltage measurement (DC coupling)

Resistor Resistance measurement

The GL7-DCB module can measure micro distortion levels using strain gauges, strain gauge-based sensors, voltage, and resistance. The input

signal type is set on the input settings menu in each channels.

Input setting menu for GL7-DCB

Select the "Input" for setting the input

signal types.

Select the "Input" for setting the type

of input signal.

Note:

The description of the setting is the following.

2. Setting the GL7-DCB module, Set measurement types

Select the type of input signal. Showcase the input type after

selecting the sensor on the previous

menu.

Note:

When the input type is set to "Strain gauge", "Strain sensor", and "Resistor", the

excitation voltage for the sensor or resistor will be outputted from the input

connector. If wire connection of the sensor or equipment is not correct, the

equipment or the GL7-DCB module might get damaged.

Setting of signal type (selects to the strain gauge)

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 5 -

Configuration Connection Bridge circuit Strain Gauge Type

120 ohms 350 ohms

2 wires

Remote-sensing: Non (It is affected by temperature, etc.)

E: Excitation voltage,

e: Output signal,

R: Elements of bridge

circuit

3 wires

Remote-sensing: Yes (It is not affected by temperature, etc.)

E: Excitation voltage,

e: Output signal,

R: Elements of bridge

circuit

4 wires

Remote-sensing: Yes (It is not affected by temperature, etc.)

E: Excitation voltage,

e: Output signal

R: Elements of bridge

circuit

Remote-

sensing wire

Shunt

resister

Single gauge configuration (Quarter bridge)

Remote-

sensing wire

Shunt

resister

Configuration Connection Bridge circuit Strain Gauge Type

120 ohms 350 ohms

3 wires

Remote-sensing: Non (It is affected by temperature, etc.)

E: Excitation voltage,

e: Output signal,

R: Elements of bridge

circuit

4 wires

Remote-sensing: Yes (It is not affected by temperature, etc.)

E: Excitation voltage,

e: Output signal,

R: Elements of bridge

circuit

5 wires

Remote-sensing: Yes (It is not affected by temperature, etc.)

E: Excitation voltage,

e: Output signal

R: Elements of bridge

circuit

Dual gauge configuration (Half bridge)

Remote-sensing circuit

Shunt

resister

Remote-sensing circuit

3-1. Setting the GL7-DCB module, Using Direct Strain Gauge Connection (1/2)

Bridge circuit is normally required when signal is measured using strain gauges. The element of this bridge circuit is incorporated inside the GL7-

DCB module. The GL7-DCB strain gauge module supports strain gauges configured in Single gauge (Quarter bridge), Dual gauge (Half bridge),

and Four gauge (Full bridge) configuration with multiple types of wiring format. The bridge circuit for each channels can be configured using the

switch setting for each channels.

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GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 6 -

Configuration Connection Bridge circuit Strain Gauge Type

120 ohms 350 ohms

4 wires

Remote-sensing: Non (It is affected by temperature, etc.)

N/A

E: Excitation voltage

e: Output signal

6 wires

Remote-sensing: Yes (It is not affected by temperature, etc.)

N/A

E: Excitation voltage

e: Output signal

Four (4) gauge configuration (Full bridge)

Remote-sensing

circuit

Shunt

resister

3-1. Setting the GL7-DCB module, Using Direct Strain Gauge Connection (2/2)

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 7 -

When micro distortion levels are measured using strain gauges, bridge circuit needs to be configured to its gauge types. The elements for the

bridge circuit is incorporated in the GL7-DCB module, and will need to be configured based on your chosen strain gauges.

3-2. Setting the GL7-DCB module, Using the Strain Gauge, Menu Setting (1/7)

Select the "Input" for setting the type

of input signal. Set the "Input" to "Strain gauge". Select the "Bridge type" for setting the

used number of strain gauges. Select the type of bridge.

Select the "Number of wires" for

setting the type of the gauge. Select the number of wires from the

gauge. Select the "Gauge resistor" for setting

the type of strain gauge.

Selected input signal is displayed.

Note: Type of bridge - Number of gauges

Quarter bridge: using single (1) gauge

Half bridge: using dual (2) gauges

Full bridge: using four (4) gauges

Note: Displayed number of wires are

varied by the setting of the type of

bridges.

Select the resistance of the used

gauge.

Setting the strain gauge configuration

Input setting menu for GL7-DCB

In this example, the micro distortion (strain) is

measured using the strain gauge.

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DC Strain module GL7-DCB, Method to take advantage

GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 8 -

The elements for the bridge circuit is incorporated in the GL7-DCB module, and they are configured by the setting on the switches for each

channels. The setting pattern will be displayed on the screen after setting parameters are entered. The excitation power for the bridge circuit

needs to be applied. The range of measurement will vary by the setting of the excitation source.

3-2. Setting the GL7-DCB module, Using the Strain Gauge, Menu Setting (2/7)

Select the "Polarity inverse" for

setting polarity of the signal. Select the ON or OFF. Settings of strain gauge are displayed. Select the "Misc" for setting the

condition of the bridge circuit.

Select the "Sensor setting" for setting

the condition of excitation for bridge

circuit.

Select the “Bridge power”for setting

the type of excitation for bridge circuit. Select "Voltage" or "Constant current"

for type of excitation.

Note: If polarity of the phenomena and

measured signal is not the same, this

setting needs to be changed.

Select the "Bridge voltage" for setting

value of excitation.

Setting the excitation for bridge circuit

Note: Setting pattern of switch for

configuring channel will be shown below.

You will need set the switches to the ones

shown here.

Note: Voltage would be normally selected

here. When lead wire of the gauge is long,

constant current is used to avoid the noise

factor from the lead wire.

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GL7000 Product Information (GL7-DCB, vol. 2, rev. 1.0) - Page 9 -

Measurement ranges can be set after all parameters of strain gauge are complete. The range of signal to be displayed can be set here. Captured

signal is limited up to the selected measuring range. The displayed signal range can be set separately from the measuring range.

3-2. Setting the GL7-DCB module, Using the Strain Gauge, Menu Setting (3/7)

Select the voltage for excitation.

Note: 5V and 10V can be selected when

the gauge with 300 ohms or higher is

applied.

Setting the unit for strain measurement

Select the range. Select the "Upper" and "Lower" span

for setting display signal range. Set the value for displayed signal

range.

Note: The span setting affects the range of signal to be displayed on the screen. The range of captured signal is set by the "Range".

The captured signal will be saved to specified memory media.

Select the "Strain unit" for setting the

measurement unit. Select the "με" (micro-epsilon) or

"mV/V" for the unit of measurement. Select the "Range" for setting

measuring range.

Note: When micro distortion is measured,

usually the "με" is used. When sensors

are used, "mV/V" would normally be

applied.

Note: Displayed value of ranges are

varied by setting the excitation condition.

Setting the span (range of signal to be displayed)

Setting of measuring range

Select the "Span" for setting the

displayed signal range.

Study Guide

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