ONO SOKKI - Impulse Hammer GK series

Impulse Hammer GK-4110G10/GK-2110

Impulse Hammer
GK series

GK series impulse hammer is an excitation hammer which is built in a sensor to measure a natural vibration frequency or perform modal analysis of a mechanical structure.

In addition to the GK-3100 for general purpose usage, the GK-2110 is an ultra compact type weighing of 4.8 g for excitation of small and light-weighted parts. For excitation of large structures such as automobile’s framework structure, the large type of the GK-4110G10 weighing of 1.1 kg is suitable. You can choose any one depending on your requirements.

By mounting an accelerometer on a measurement object and hitting it with impulse hammer, excitation force signals from an impulse hammer and response acceleration signals from an accelerometer are input to an FFT analyzer to enable measurement of the frequency response function (natural frequency). Moreover, you can perform modal analysis of the object by sending the obtained frequency response function data to a PC in which modal analysis software is installed.

Features

■ GK-2110

As a light-weighted of 4.8g (when attached with a plastic hammer handle), the GK-2110 enables excitation for noise analysis from a small case of HDD or thin pipe in compressor etc. and its measures.
Up to around 20 kHz of excitation is available.
2 kinds of hammer handles are provided as standard to meet your requirements. The hammer with a plastic hammer handle can be used as an excitation for exceptionally-light measurement object. Whereas the hammer with aluminum hammer handle provides a large excitation force.

■ GK-3100

Attaching an extender mass (provided as standard) on the GK-3100 (140 g as standard) weighs a total of 220 g. Only using the GK-3100 gives a wide range of excitation force.
Exclusive sensor amplifier is provided as standard.
4 kinds of impact tips are provided as standard. Excitation frequency can be changed according to requirements of your test structures.

■ GK-4110G10

The GK-4110G10 impulse hammer weighing of 1.1 kg can perform vibration analysis of the trestle for machinery which has a great effect on an accuracy of machine tool or modal analysis of automobile’s framework structure.
Built-in amplifier with CCLD enables direct connection to analyzers.
4 kinds of impact tips are provided as standard. Excitation frequency can be changed according to requirements of your test structures.

System configuration

Overview Specifications

	GK-2110	GK-3100	GK-4110G10
Measurement range	220 N	2,200 N	22,000 N
Detection element	Crystal	Crystal	Crystal
Sensitivity	22.5 mV/N	2.3 mV/N	0.23 mV/N
Resonance frequency	100 kHz or more	31 kHz or more	12 kHz or more
Excitation Frequency range (when hard tip in use)	Up to 20 kHz	Up to 8 kHz	Up to 1 kHz
Hammer weight	4.8 g (when attached with a plastic hammer handle)	140 g	1,100 g
Head diameter	6.3 mm	15 mm	51 mm
Tip diameter	2.5 mm	6.4 mm	51 mm
Hammer length	107 mm	203 mm	370 mm
Output connector	Aluminum hammer handle (5-44 coaxial connector) Plastic hammer handle (directly－attached cable, miniature 10-32 connector)	BNC（CO2）	BNC（CO2）
Output signal	Voltage output with CCLD compatible	Voltage output with CCLD compatible	Voltage output with CCLD compatible Applicable to TEDS (Ver. 1.0)
Output impedance	100 Ω or less	100 Ω or less	100 Ω or less
CCLD power supply	2 to 20 mA, +18 to +30 VDC	2 to 20 mA, +18 to +30 VDC	2 to 20 mA, +18 to +30 VDC
Sensor amplifier	Sold separately: SR-2200	Provided as standard: Power supply unit (sensor amplifier) Sold separately: SR-2200	Sold separately: SR-2200
Cable	Provided as standard: GK-0132 （3 m, for aluminum hammer handle）	Provided as standard: Signal cable（3 m） Sold separately: GK-0122（3 m）	Sold separately: MX-100 series
Accessories	Storage case Extender mass^*1 Wax Impact tip (vinyl) 5-44=10-32 cable （3 m） Hammer handle (aluminum, plastic) Data sheet	Storage case Extender mass Power supply unit (sensor amplifier) Cable for hammer (BNC, 3 m) Cable for signal output Impact tip set (super soft, soft, medium, hard) Data sheet	Storage case Impact tips set (super soft, soft, medium soft) Data sheet

■ NP-0021 conversion connector is required when GK-2110 is connected to BNC connector.

*1: Extender mass should be mounted when the hammer with aluminum hammer handle is used.

Options

■Options for GK-2110

Product name	Model name
Impact caps (3 pieces)	GK-0205
Extender mass	GK-0211
Plastic hammer handle	GK-0221
Aluminum hammer handle	GK-0222

■Options for GK-3100

Product name	Model name
Medium tip	GK-0503
Super soft tip	GK-0504
Soft tip	GK-0505
Hard tip	GK-0506

■Options for GK-4110G10

Product name	Model name
Medium tip	GK-0403
Super soft tip	GK-0404
Soft tip	GK-0405
Hard tip	GK-0406

Frequency Response Characteristics according to Tip types

■GK-2110

■GK-3100

■GK-4100G10

Revised: 2010/03/31