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Graphtec Instrument GL7000 Modules GL7-HSV.jpg

GL7-CHA   Charge/Accelerometer Module

This is the input module for sensors based on piezoelectric elements capable of measuring a variety of phenomena including acceleration, pressure, and force.  You are able to connect the BNC output from the sensor directly into our charge/accelerometer module which supports TEDS based sensors. Additional filtering capability allows accurate measurement of vibration and dynamic signal recording from piezo-based sensors.

Graphtec Instruments GL7000 Modules GL7-CHA Calibration Value.gif

Sound input by piezo-based microphones on the charge/acceleration module (GL7-CHA)

Sound or vibration analysis can be performed by third party software using recorded sound data.

High-precision measurement using various filters

High accuracy can be achieved using various filters using high-pass, low-pass, and anti-aliasing filters.

Graphtec Instruments GL7000 Modules GL7-CHA High Precision Measurement.gif

Supports a variety of piezoelectric type sensors

This module supports various types of piezoelectric sensors including accelerometers, forge gauges, and pressure transducer – all supported with direct sensor input using BNC or micro-connector inputs.

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


Sensors with charge or voltage output using IEPE connectors can be recorded using the piezoelectric element.  GL7-CHA module also sets the sensitivity and the unit of measurement scaled to its original units.


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 has been 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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