GRAPHTEC gl7000, GL7-CHA User Manual

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Charge Module
GL7-CHA
DATA PLATFORM GL7000
Contents
1. Overview of the GL7-CHA module
P. 1
2.1 Using the IEPE-type acceleration sensor
2-2. Convert the unit using scaling function
P. 5
2-3. Using the Charge output type sensor
3. Using TEDS-based Acceleration sensor
P. 10
DATA PLATFORM ON THE GO
Acceleration/Charge Module [GL7-CHA]
Supplemental User Guide
Signal conditioning device for the GL7000 amplifier using Piezoelectric sensors
This is a technical guide for measuring using the [GL7-CHA]
module.
2. Setting the GL7-CHA module
4. Measuring Velocity or Displacement
P. 11
GL7-CHA, vol. 2, rev. 1.0 (Jan. 2014)
2-4. Using other sensors
P. 8
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Input for IEPE type sensor and voltage
The charge/acceleration module GL7-CHA is the signal conditioner for the GL7000. It carries a isolated 4 channel input, and corresponds to sensors using Piezoelectric element (either the charge signal output type and IEPE type), and supports voltage measurement. Input signal type can be set individually for each channels.
• Supports charge output type sensor, IEPE sensor, and also voltage input
Supports sensor corresponding to TEDS
High precision module by reduced noise suppression through a low-pass, high-pass, and anti-aliasing filter
Input for the charge signal output type sensor
+
-
+
-
Signal cable of sensor (miniature connector, plug)
Miniature type connector (screw size: #10-32 UNF)
Signal cable of sensor (BNC connector, plug)
BNC connector, female
Charge Module
GL7-CHA (4ch / unit)
When using the charge output type sensor, connect the sensor to the miniature connector.
When measuring voltage or using the IEPE sensor, connect the sensor to the BNC connector.
Usable acceleration sensor: 0.01pC/(m/s2) to 999.9pC/(m/s2)
Usable acceleration sensor: 0.01mV/(m/s2) to 999.9mV/(m/s2)
GL7-CHA can be used with the piezoelectric type acceleration sensors as well as other sensors listed below.
Sensor type Example of sensor sensitibity (Unit of output signal)
Piezoelectric element type sensor
Charge output type
Acceleration sensor pC/(m/s
2
), pC/(9.8m/s2), pC/g, pC/G
Pressure sensor pC/kPa, pC/bar, pC/(kg/cm
2
), pC/psi
Force or Load sensor pC/N, pC/kgf, pC/kg, pC/lb
IEPE type
Acceleration sensor mV/(m/s
2
), mV/(9.8m/s2), mV/g, mV/G
Pressure sensor mV/kPa, mV/bar, mV/(kg/cm2), mV/psi
Force or Load sensor mV/N, mV/kgf, mV/kg, mV/lb
1. Overview for the GL7-CHA module (1/2)
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Type Description
Charge Sensor of the Charge output t ype
IEPE Sensor of the IEPE type
DC Voltage measurement (DC coupling)
AC Voltage m easurement (AC coupling)
Charge-RMS RMS measurement in charge output type sensor
IEPE-RMS RMS measurement in IEPE type sensor
DC-RMS RMS measurement in Voltage (DC coupling)
AC-RMS RMS measurement in Voltage (AC coupling)
1. Overview of the GL7-CHA module (2/2)
The GL7-CHA module can measure the signal of the piezoelectric type sensors and voltage. The input signal type is set on the input settings menu.
Input setting menu for GL7-CHA
Select the "Input" for setting the type of input signal.
Select the type of input signal.
Note: When the input type is set to the "IEPE" or "IEPE-RMS", the excitation current for the sensor will be given out from the input connector.
Note: When the input type is set to the "Charge", "Charge-RMS", "IEPE" or "IEPE-RMS", the available measuring range is automatically set shown in the following table.
Rabge
Charge signal output type sensor, Sensitivity (unit: pC/(m/s
2
)) IEPE type sensor, Sensitiv ity (unit: mV/(m/s2))
0.0100 to
0.5000
0.5001 to
2.0000
2.0001 to
5.0000
5.0001 to
10.0000
10.0001 to
20.0000
20.0001 to
50.0000
50.0001 to
100.0000
100.0001 to
200.0000
200.0001 to
500.0000
500.0001 to
999.9999
0.0100 to
0.0200
0.0201 to
0.0500
0.0501 to
0.2000
0.2001 to
0.5000
0.5000 to
1.0000
1.0001 to
2.0000
2.0001 to
5.0000
5.0001 to
10.0000
10.0001 to
20.0000
20.0001 to
50.0000
50.0001 to
100.0000
100.0001 to
200.0000
200.0001 to
500.0000
500.0001 to
999.9999
1 m/s
2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A X X X X
2 m/s
2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A X X X X X
5 m/s
2
N/A N/A N/A N/A N/A N/A X X X X N/A N/A N/A N/A N/A N/A N/A N/A X X X X X X
10 m/s
2
N/A N/A N/A N/A N/A X X X X X N/A N/A N/A N/A N/A N/A N/A X X X X X X X
20 m/s
2
N/A N/A N/A N/A N/A X X X X X N/A N/A N/A N/A N/A N/A X X X X X X X N/A
50 m/s
2
N/A N/A N/A X X X X X X X N/A N/A N/A N/A X X X X X X X X N/A N/A
100 m/s
2
N/A N/A X X X X X X X N/A N/A N/A N/A N/A X X X X X X X N/A N/A N/A
200 m/s
2
N/A N/A X X X X X X N/A N/A N/A N/A N/A X X X X X X X N/A N/A N/A N/A
500 m/s
2
N/A X X X X X X N/A N/A N/A N/A N/A X X X X X X X N/A N/A N/A N/A N/A
1000 m/s
2
X X X X X N/A N/A N/A N/A N/A N/A X X X X X X X N/A N/A N/A N/A N/A N/A
2000 m/s
2
X X X X X N/A N/A N/A N/A N/A N/A X X X X X X N/A N/A N/A N/A N/A N/A N/A
5000 m/s
2
X X X X N/A N/A N/A N/A N/A N/A X X X X X X N/A N/A N/A N/A N/A N/A N/A N/A
10000 m/s
2
X X X N/A N/A N/A N/A N/A N/A N/A X X X X X N/A N/A N/A N/A N/A N/A N/A N/A N/A
20000 m/s
2
X X N/A N/A N/A N/A N/A N/A N/A N/A X X X X N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
50000 m/s
2
X N/A N/A N/A N/A N/A N/A N/A N/A N/A X X X N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
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2-1. Setting the GL7-CHA module, Using IEPE type acceleration sensor (1/2)
When IEPE type acceleration sensor is used, the sensor excitation current and sensor sensitivity need to be set for measuring acceleration signal. The excitation current is required to drive the IEPE sensor. The sensor output is converted to the accelerometer signal using the sensor sensitivity. The default setting of the unit on this module is set to the "m/s2" which is the unit of measurement certified by the International System of Units (SI unit) for acceleration. When sensors other than the acceleration are used, scaling function will need to be used. If the accelerometers are scaled in other format than "m/s
2
", such as "g" (for gravity), scaling function will need to be used. Please refer to section 2.4 for more detail on this.
Setting the sensor excitation
Setting sensor sensitivity
Input setting menu for GL7-CHA
Enter the value of the sensitivity.
Sensitivity is displayed on the “Other
settings” menu.
Select the "Misc" for setting the condition of the sensor.
Select the Sensor sensitivity” for
setting condition on sensitivity.
Select the "Applied current" for setting the condition.
In this example, the IEPE type acceleration sensor that has sensitivity of 10.00mV/(m/s
2
) is
used.
Select "4mA" or "8mA".
Excitation current will be displayed on
the “Other settings” menu.
Note: The sensitivity of sensor is written on the data sheet of the sensor. The value is entered to the GL7-CHA setting menu.
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2-1. Setting the GL7-CHA module, Using IEPE type acceleration sensor (2/2)
Setting of measuring range
Setting of display range of signal (span)
Confirm the setting value of upper (Max.) and lower (Min.) signal display range.
Entered value for the signal display range (span) is displayed.
Select the "Range" for setting the measuring range.
Enter the value for the signal display range.
Select the signal measuring range from displayed settings.
Selected range is displayed.
Select the "Span" for setting the displayed range of signal.
Select the “Upper” or “Lowervalues for setting the signal display range.
Note: The signal is measured within the selected range. If "50m/s2" is selected, the signal can be measured from -50m/s
2
to +50m/s2. The available measuring range is automatically displayed that will be relative to the setting of the sensor sensitivity.
Note: The measured signal is displayed on the screen within the span setting. The range of signal to be measured is set by the "Range".
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2-2. Convert the measurement unit using the scaling function (1/2)
When the measured acceleration signal needs to be displayed with units other than m/s2” even if the IEPE type sensor is scaled in th “m/s2”, the scaling function can convert the measured signal to a different unit of measurement.
Input setting menu for GL7-CHA
Select "Scaling" for setting the condition.
Enable Scaling.
Select the "Decimal point" for setting the digits of the scaled value.
Select number of digits above the decimal point. This will be how the scaled values will be displayed.
Select the “Upper” or “Lowervalues for the Scal. Value. This is the scaled value corresponding to the measurement value for "Upper" and
"Lower" values from the “Meas. Value".
In this example, the sensor scaled in the
m/s2” unit is used to measure acceleration, and then the measured signal is displayed and saved in unit measurement, "g" (gravitational acceleration).
The conversion rate between the
"m/s2" and "g" is as follows.
1 m/s
2
= 0.10197 g
1 g = 9.80665 m/s
2
Setting of scaling value
Select the “Upper” or “Lowervalues for the Meas. Value. This is the original measurement value which will be converted to the scaled value.
Enter the value. If set value is out of limit, change the setting of the measuring range.
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Setting the scaling unit (select from pre-set)
Select the "Unit" for entering the unit of scaled value.
Enter the unit using displayed keyboard.
Select the type of signal for displaying
the unit that has been pre-set.
Press the "Select" for selecting type of scaled signal.
2-2. Convert the measurement units using the scaling function (2/2)
Setting for scaling unit
Select the unit from preset.
Select the "Setting" for selecting type of the unit.
Scaled value is displayed.
Note: The unit of scaling can be entered directly or it can be selected from the preset unit.
Enter the value for scaling.
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2-3. Setting the GL7-CHA module, Using Charge output type sensor
When Charge output type acceleration sensor is used, sensor sensitivity need to be set for measuring acceleration signals. With the charge type sensors, the excitation current is not required to drive the sensor. The sensor output is converted from the acceleration signal using the sensor sensitivity. Range, Scaling, Spanand other settings will need to be defined. Please refer to the page for IEPE type sensor for securing these settings. When sensors other than accelerometers are used, scaled measurements needs to be set. If the acceleration sensor is scaled in other than units in “m/s
2
, such as g(for gravity), you will need to define your scaled measured. Please refer to the next page on section 2.4 (page 8).
Setting of sensor sensitivity
Setting the measuring range
Input setting menu for GL7-CHA
Select the "Misc" for setting the condition of the sensor.
Select the "Sensor sensitivity" for setting the condition.
In this example, the Charge output type acceleration sensor has a sensitivity of 10.00pC/(m/s
2
).
Enter the value of the sensitivity.
Entered sensitivity will be displayed.
Note: The sensitivity of sensor is written on the data sheet for the sensor.
Setting the scaling
Setting the span (display range of signal)
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