BRÜEL & KJÆR ® Modal and Measurement Exciters
Hand-held Exciter Type 5961
Hand-held Exciter Type 5961 combines the versatility of a shaker testfor optimizing the excitation signal to the test at hand with the mobilityof an impact hammer test for easily roving around the test structure.
While an impact hammer test is fast and easy to perform, the highcrest factor* has the potential to drive the structure into non-linear
behaviour. Also, the highly deterministic nature of the impact signal
means that a linear approximation of slightly non-linear structures isnot possible when performing averaging.
In a shaker test, various types of random excitation signals such ascontinuous, burst, and periodic can be used to significantly lower
the crest factor and perform a good linear fit of slightly non-linear
structures. In addition, using burst or periodic random excitation you
can avoid leakage in the analysis. With shaker testing, you also havefull control of excitation bandwidth and can limit it to the frequency
range of interest including zoom measurements.

Uses• Excitation of small structures:– General vibration testing– Mechanical impedance and mobility measurements– Experimental modal analysis• Tests where hand-held operation is ideal:– Field measurements– Troubleshooting– Fast investigations• Permanent lab setups with a fixed exciter position using
fixtures and stingers

Features• The mobility of hammer testing combined with the broad
range of excitation signals of shaker testing• Compact and lightweight design• Battery operation, no separate power amplifier or connection
to mains power• Hand-held operation, requires no elaborate fixturing• Frequency range: 45 Hz to 15 kHz• Force range: 2 N peak (0.310 N RMS)

Description

Using Type 5961

Hand-held Exciter Type 5961 is a lightweight, compact exciterthat consists of an electromagnetic exciter driven by a built-in
battery-operated power amplifier.

Hand-held Exciter Type 5961 can be used for various applications
such as general vibration tests, mechanical impedance andmobility measurements, and experimental modal analysis where
only low force levels are required.

The excitation signal is fed to the exciter via the BNC connector
at the bottom of the exciter. The exciter can operate within a(typical) frequency range of up to 15 kHz with a force rating of
0.310 N RMS, or approximately 2 N peak.
Type 5961 weighs about 500 grams (17 oz) and comes with aspiral cable which has a length from 1.1 to 4 metres (3.6 to13.1 feet). The exciter is delivered in its case together with its
cable and accessories.

* Crest factor = XPeak/XRMS, where X is the excitation signal

www.bksv.com

Hand-held use
A force transducer (not included with Type 5961) is connected tothe front of the exciter. The exciter comes with two different steel
test probe tips, round and sharp, which enable mechanicalcontact with the test structure. The tips can be mounted on ashort pin or a long pin.
Typical hand-held test scenarios range from a simple resonancetest in which the structure is excited at a single point anddirection, called a degree of freedom (DOF), to a complete modal
test in which the structure is excited at multiple DOFs one by one.
One or more fixed uni- or triaxial accelerometers are typicallyused as references.

Permanent lab setups
One or more exciters with fixed positions can be used with fixedor roving uni- or triaxial accelerometers. For each exciter, a force
transducer is mounted on the structure with a stinger between
the force transducer and the exciter.

Product Data BP 1442 – 13

Measurements

Ordering Information

Fig. 1 shows measurement results from a resonance test on asmall lightly-damped structure using pseudo-random excitation
performed using BK Connect® software and a LAN-XI dataacquisition system. The H2 FRF (frequency response function)
estimator is used as it often is the best estimator for testing onsmaller structures.

Type 5961

Fig. 1 Top: Input force autospectrum. Middle: FRF H2. Bottom: Coherence function.

Hand-held Exciter
Includes the following accessories:• WL-1100: Spiral cable, length 1.1 to 4 m (3.6 to 13.1 ft)• QB-0016: 9 V alkaline battery, IEC Type 6LF22 or 6LR61• WS-3677: Test pin, short• YP-0080: Test pin, long
• DB-0544: Test probe tip, round• DB-0545: Test probe tip, sharp• YQ-2962: Screw, socket set screw, 10–32 UNF × 5/16
(7.7 mm)

Optional Accessories
STINGERSWZ-0066

Nylon Stinger Kit• 10 × stingers, length 50 mm (0.16 ft)• 10 × stingers, length 120 mm (0.39 ft)

Note: Other stingers, force transducers and accelerometers areavailable, please ask your sales representative.

Compliance with Standards
The CE marking is the manufacturer's declaration that theproduct meets the requirements of the applicable EU directives
RCM mark indicates compliance with applicable ACMA
technical standards – that is, for telecommunications, radio
communications, EMC and EME

Specifications – Hand-held Exciter Type 5961
Frequency range

45 Hz to 15 kHzSensitivity

150 mN/Vin (typical and broadband) where
Vin = 2.0 V RMS, Load mass = 2 kgForce rating (RMS)

2 N (typical at resonance)

China RoHS mark indicates compliance with administrative
measures on the control of pollution caused by electronic
information products according to the Ministry of Information
Industries of the People’s Republic of China
WEEE mark indicates compliance with the EU WEEE Directive

2022-02

ACCELEROMETERS
Type 4507-B
Piezoelectric CCLD Accelerometer
Type 4524-B
Triaxial Piezoelectric CCLD Accelerometer© Hottinger Brüel&Kjær A/S. All rights reserved.

FORCE TRANSDUCER
Type 8230
CCLD Force Transducer (+44/–44 N range)

BP 1442 – 13

100 mN (typical at 10 kHz)

2000
1750
15001250mN 1000
750
500
2500Input voltage

20Hz50 100 200 500 1 262 (Resonance) kHz
Frequency

5

ËBP-1442---’ÎFig. 2 Force vs frequency (linear y-axis)

10 20941959/1

2.0 V RMS (Distortion: <3%)
3.5 V RMS (Max. input)

Battery lifetime

Approximately 3 hours constant use

Dimensions

Length: 155 mm (6.1 in)Diameter: 52 mm (2.05 in)
Weight: 500 grams (17 oz) including battery

Teknikerbyen 28 · DK-2830 Virum · Denmark
Telephone: +45 77 41 20 00 · Fax: +45 77 41 21 00
www.bksv.com · info@hbkworld.com
Local representatives and service organizations worldwide
To learn more about all HBK offerings, please visit hbkworld.com
Although reasonable care has been taken to ensure the information inthis document is accurate, nothing herein can be construed to imply
representation or warranty as to its accuracy, currency orcompleteness, nor is it intended to form the basis of any contract.
Content is subject to change without notice – contact HBK for thelatest version of this document.
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logos and product names are the property of Hottinger Brüel & Kjær A/Sor a third-party company.