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-CHA Charge Module GL 7000 Data Acquisition Equipment

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This is the input module for the sensors based on the piezoelectric elements 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. It supports the TEDS in the sensor and allows to make setup easily.

It supports various filters capable to have high-precision measurement.

High-precision measurement using various filters

High-precision signal is able to be captured by the high-pass, low-pass, and anti-aliasing filter.

Supports a variety piezoelectric type sensors

This module supports a variety type of piezoelectric sensors including an acceleration sensor,
and supports direct connection of the sensor.

Type of sensor

Unit of sensitivity (example)

Piezoelectric type sensors

Charge output type

Acceleration sensor


Pressure sensor


Force/Load sensor


Voltage output (IEPE) type

Acceleration sensor


Pressure sensor


Force/Load sensor


The charge output type and voltage output (IEPE) type are available in the piezoelectric type sensor
for measuring a wide variety phenomena. Variety type of sensors are able to use by
setting the sensitivity and the unit of measurement.

Application examples

GL7-CHA specification

Item Description
Type of module Charge amplifier module - for sensor based on Piezoelectric element -
Model number GL7-CHA
Number of input channels 4 channels
Input method All channels isolated unbalanced input, Simultaneous sampling,
BNC and Miniature connector (#10-32UNF)
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 Sensor in charge output type, Sensor in IEPE type, Voltage
Input coupling Sensor: Charge-RMS, IEPE-RMS
Voltage: DC, AC, DC-RMS, AC-RMS
Measurement range Acceleration sensor input 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000 m/s2
Voltage input DC, AC coupling: 50, 100, 200, 500 mV, 1, 2, 5, 10 V
RMS measurement: 20, 50, 100, 200, 500 mVrms, 1, 2, 5 Vrms
(Crest Factor in RMS measurement: up to 4 in 20 mVrms to 2 Vrms range, up to 2 in 5 Vrms range)
Supported sensor sensitivity Charge output type 0.01 pC/(m/s2) to 999.9 pC/(m/s2)
IEPE type 0.01 mV/(m/s2) to 999.9 mV/(m/s2)
Measurement accuracy (*1) Charge output type ±0.9% of Full Scale ([sensor sensitivity] × [setting range] ≥ 20 pC)
IEPE type ±0.25% of Full Scale ([sensor sensitivity] × [setting range] ≥ 200 mV)
A/D converter Successive Approximation type, 16bits (effective resolution: 1/40000 of the measuring full range)
Input impedance 100 kΩ ±5%
Excitation power 4 or 8 mA (supported voltage: 22 V ±10%)
Maximum input charge signal Max. 50000 pC
Maximum input voltage Between (+) / (-) terminal 25 Vp-p
Between channels ((-) terminals) 25 Vp-p
Between channel / GND 25 Vp-p
Max. voltage (withstand) Between channels 300 Vp-p (1 minute)
Between channel / GND 300 Vp-p (1 minute)
Isolation Between input / GND Min. 50 MΩ (at 500 V DC)
Common-mode rejection ratio Min. 80 dB (50/60 Hz, Signal source impedance: Max. 300 Ω)
Frequency response Charge type 1.5 Hz to 45 kHz
IEPE type 1 Hz to 45 kHz
Filter Hi pass Off, 0.15, 1, 10 Hz
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 Class1 (Temperate No.25)
Support Reading information from the sensor and setting it to module
Calculation function Integration (convert measurement to velocity),
Double Integration (convert measurement to displacement)
External dimensions (W x D x H) Approx. 49 x 136 x 160mm (Excluding projections)
Weight Approx. 850 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.

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