CMAC 2504
Acoustic emission pulse generator
The CMAC 2504 is a handheld, portable
acoustic emission pulse generator used to
inject a known signal into a machine instrumented with an SKF Acoustic Emission
Enveloping (AEE) condition monitoring system. The system’s response to the signal is
used to validate the installation. The
CMAC 2504 generates a pulse train output
with 20 V amplitude, 2.0 μs pulse width and
a repetition frequency of ~70 Hz. The AEE
system response should be an attenuated
pulse train with the same repetition frequency (~70 Hz). The presence of this
response is sufficient to validate an AEE
installation.
Key features
• Pulse train output with 20 V amplitude,
2.0 μs pulse width and a repetition
frequency of approximately ~70 Hz
• LED indicators for on/off state and also for
low battery condition
• Estimated battery life > 100 hours for
Lithium PP3 battery
• Automatically turns off after 60 minutes
to conserve battery life
• Handheld
• Portable
• Rugged rubber boot
• Carrying case
Recommended use
All installations of SKF AEE condition monitoring solutions must be
validated before they can be commissioned. The CMAC 2504 is recommended for the validation of SKF AEE condition monitoring systems including SKF Multilog On-line IMx systems equipped with
CMON 2504 AE interface cards and appropriate acoustic emission
sensors. The CMAC 2504 can also be used to optimise sensor locations in advance of permanent installation by assessing the signal
attenuation for different sensor positions using the CMAC 2504 as
an input stimulus.
SKF Acoustic Emission Enveloping
SKF Acoustic Emission Enveloping has been developed for the purpose of detecting lubrication film breakdown and contamination in
the lubrication of a bearing. It can also be used with other SKF condition monitoring equipment and techniques to help identify a range of
machinery defects. A signal from an appropriate acoustic emission
sensor is band-pass filtered (100 to 500 kHz), rectified and enveloped. This signal then forms the raw AEE data, which is then
acquired and analysed using standard vibration analysis equipment.
SKF AEE technology is installation-sensitive and therefore all installations of SKF AEE condition monitoring solutions should be validated using the CMAC 2504 prior to being commissioned.
Components
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2
Acoustic emission pulse generator base unit
9 V PP3 Lithium battery with rating 550 to 1 200 mAh
Protective rubber boot with stand/belt-clip
Signal cable (BNC to SMB)
Acoustic emission transducer
Couplant gel
Protective carrying case
Specifications
CMAC 2504 main unit
Dimensions
• Size (H × W × D):
– Base unit: 135 × 70 × 24 mm (5.3 × 2.8 × 0.9 in.)
– With rubber boot: 145 × 83 × 34 mm (5.7 × 3.3 × 1.3 in.)
• Weight:
– Base unit: 119 g (4.2 oz.)
– With rubber boot: 198 g (7.0 oz.)
Environmental
• Temperature range:
– Operating mode: –20 to +60 °C (–5 to +140 °F)
– Storage: –40 to +60 °C (–40 to +140 °F)
• Ingress protection: IP40
• Humidity: 10 to 90% relative (non-condensing)
• Drop: 1 m to MIL-STD-810
• Explosive atmospheres: Not suitable
Power supply
• 9 V PP3 Lithium battery with rating 550 to 1 200 mAh
Output
• Connector: Male brass SMB bulkhead – 50 Ω (push-pull fitment)
• Unipolar pulse train:
– Pulse amplitude: 20 V
– Pulse width: 2.0 μs
– Pulse rise time: 15 ns
– Repetition frequency: 70 Hz (±10%)
Control
• Domed metal membrane on/off switch
Specifications (continued)
Acoustic transducer
CMAC 2504 cable
Olympus acoustic transducer (V101)
Environmental:
Dimensions
• Size:
– Diameter: 3 mm (0.12 in.)
– Length: 1,8 m (6 ft.)
• Weight: 40 g (1.4 oz.)
Environmental:
• Temperature range:
– Operating mode: –20 to +60 °C (–5 to +140 °F)
– Storage: –40 to +60 °C (–40 to +140 °F)
• Ingress protection: IP40
• Humidity: 10 to 90% relative (non-condensing)
• Drop: 1 m (3.3 ft.) to MIL-STD-810
• Explosive atmospheres: Not suitable
Connectors
• Input connector: SMB female (with strain relief)
• Output connector: BNC female (with strain relief)
• Size (H × D): 32 × 41 mm (1.3 × 1.6 in.)
• Weight: 159 g (5.6 oz.)
• Temperature range:
– Operating mode: –20 to +60 °C (–5 to +140 °F)
– Storage: –40 to +60 °C (–40 to +140 °F)
• Ingress protection: IP40
• Humidity: 10 to 90% relative (non-condensing)
• Explosive atmospheres: Not suitable
• Connector: BNC male connector
Ordering information
• CMAC 2504 Acoustic Emission Pulse Generator, includes:
– Base unit [CMAC 2504-1]
– Rubber boot [CMAC 2504-2]
– Signal cable [CMAC 2504-3]
– Acoustic emission transducer [CMSS 2504]
– Couplant gel [CMAC 2504-4]
– SKF carry case [CMAC 2504-5]
3
Bearings and
housings
Seals
Mechatronics
Lubrication
systems
Services
The Power of Knowledge Engineering
Combining products, people, and applicationspecific knowledge, SKF delivers innovative
solutions to equipment manufacturers and production facilities in every major industry worldwide. Having expertise in multiple competence
areas supports SKF Life Cycle Management, a
proven approach to improving equipment reliability, optimizing operational and energy efficiency
and reducing total cost of ownership.
Please contact:
SKF Condition Monitoring Center – Luleå
Aurorum 30, SE-977 75 · Luleå, Sweden
Tel: +46 (0)31 337 1000 · Fax: +46 (0)920 134 40
Web: www.skf.com/cm
® SKF and MULTILOG are registered trademarks of the SKF Group.
All other trademarks are the property of their respective owners.
© SKF Group 2014
The contents of this publication are the copyright of the publisher and may not be reproduced (even
extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy
of the information contained in this publication but no liability can be accepted for any loss or damage
whether direct, indirect or consequential arising out of the use of the information contained herein. SKF
reserves the right to alter any part of this publication without prior notice.
PUB CM/P8 14128/1 EN · May 2014
skf.com
These competence areas include bearings and
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and a wide range of services, from 3-D computer
modelling to cloud-based condition monitoring
and asset management services.
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