Obsnap Instruments Sdn Bhd
29A, Jalan SS 15/4C, 47500 Subang Jaya, Selangor, Malaysia.
+603-5621 5786
+603-5621 5829
+60122185651 (Enquiry)
+60162233687 (Vacancy)


 GL7-DCB DC Strain Module GL 7000 Data Acquisition Equipment

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This is the input module for the sensors based on the strain gauge capable of
measuring a variety phenomena as acceleration, pressure, force. It is able to
connect the sensor directly and also able to measure the voltage, and resistance.
Elements of the bridge circuit for the strain gauge are built in the module, and
it also has the excitation power for the strain gauges and sensors. It allows to make
easily measurement.


Filter function

It is able to have high-precision measurement using various filters as low-pass,
and anti-aliasing filter.

Application examples

GL7-DCB specification

Item Description
Type of module DC bridge amplifier module - for strain gauge or sensor based on a strain gauge -
Model number GL7-DCB
Number of input channels 4 channels
Input method All channels isolated balanced input, Simultaneous sampling,
D-SUB type connector (9 pins, receptacle)
Sampling speed (interval) 100 k Samples/s to 1 Sample/h (10 μs to 1 hr.)
Built in RAM 2 million samples for each channel
Input type Strain, Voltage, Resistance value (including potentiometer)
Measurement range Strain 500, 1000, 2000, 5000, 10000, 20000 με (με: 10-6 strain)
0.2, 0.25, 0.4, 0.5, 1, 2, 2.5, 4, 5, 10 mV/V
* Available ranges vary by the excitation voltage for the bridge.
Voltage 1, 2, 5, 10, 20, 50, 100, 200, 500 mV, 1, 2, 5 V Full Scale
Resistance 1, 2, 5, 10, 20, 50, 100, 200, 500 Ω, 1, 2, 5, 10, 20, 50 kΩ Full Scale
Measurement accuracy (*1) Strain ±(0.2% of Full Scale + 10 με)
Voltage ±(0.2% of Full Scale + 10 μV)
Resistance ±0.5% of Full Scale
A/D converter Successive Approximation type, 16 bits (effective resolution: 1/40000 of the measuring full range)
Input impedance 10 MΩ ±5%
Gauge ratio 2.0 constant
Supported sensor Strain (*2) Strain gauge
Quarter bridge (single gauge) in 2-, 3- or 4-wire (supports remote sensing in 3- or 4-wire)
Half bridge (dual gauge) in 3-, 4-, 5-wire (supports remote sensing in 4- or 5-wire)
Full bridge (quad gauge) in 4- or 6-wire (supports remote sensing in 6-wire)
Transducer/sensor based on a strain gauge
Full bridge type in 4-wire, Full bridge type in 6-wire (supports remote sensing)
Resistance Resistor, Potentiometer
Bridge resistance 50 Ω to 10 kΩ  * Available excitation power varies by selection of element.
Built-in element of the bridge 120 or 350 Ω for the quarter- and half-bridge
* Available excitation power varies by selection of element.
Excitation power Voltage mode 1, 2, 2.5, 5, 10 V DC
* Excitation voltage 5 and 10 V is available when bridge resistance is the 350 Ω or higher.
Current mode Constant current: 0.1 to 20 mA (supported voltage is up to 10 V.)
Zero Adjust for Strain gauge Method Fully automatic (via push button or setting the condition menu)
Max. Range ±10,000με (με10-6 Strain)
Remote sensing 3- or 4-wire in quarter bridge, 4- or 5-wire in half bridge, 6-wire full bridge
Shunt Calibration Approx. 60 kΩ (120 Ω gauge), Approx. 175 kΩ (350 Ω gauge
Maximum input voltage Between (+) / (-) terminal 10 V,
Common-mode voltage: 10 Vrms AC
Between channels ((-) terminals) 10 Vp-p
Between channel / GND 60 Vp-p
Max. voltage (withstand) Between channels 1000 Vp-p (1 minute)
Between channel / GND 1000 Vp-p (1 minute)
Isolation Between channel / GND Min. 100 MΩ (at 500 V DC)
Common-mode rejection ratio Min. 80 dB (50/60 Hz, Signal source impedance: Max. 300 Ω)
Frequency response DC to 20 kHz
Filter Low pass Off, Line (1.5 Hz), 3, 6, 10, 30, 50, 60, 100, 300, 500 Hz, 1k, 3k, 5k, 10k Hz (in -30dB/oct)
Anti-aliasing Off, On
Support TEDS Standard IEEE 1451.4 Class2 (Temperate No.33)
Support Reading information from the sensor and setting it to module
External dimensions (W x D x H) Approx. 49 x 136 x 160mm (Excluding Protection)
Weight Approx. 840 g
Subject to the conditions:
Room temperature is 23ºC ±5ºC. When 30 minutes or more have elapsed
after power was turned on.
Filter is set to 10 or Line. Sampling rate is set to 1 second.
GND terminal is connected to ground.
Remote sensing is not available when a NDIS connector is used. When a bridge box is used,
the connection needs to be 4-wire or 6-wire full bridge. When connecting with a Half bridge
(Opposite side), an additional bridge box is required. Bridge excitation: Constant current
drives a strain gauge type sensor or a 4-wire full bridge. The shunt calibration is available
only when the connection is using a 3-wire, 4-wire quarter bridge, 5-wire full bridge, or 6-wire
full bridge.

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