PRODUCT DATA
Calibration Exciter — Type 4294
Calibration Exciter Type 4294 is a small, handy, completely self-
contained vibration reference source. It is intended for rapid
calibration and checking of vibration measurement, monitoring
and recording systems.
FEATURES
❍ Small, lightweight and battery-driven
❍ Leather case with impact protection – designed for everyday use in
harsh environment
❍ Drop- and environment-tested according to IEC 60068
❍ Splash-proof according to IP54 (IEC 60529)
❍ High precision, crystal controlled servo-operating at 159.15 Hz
(1000 rad s–1)
USES
❍ Quick, easy field calibration of vibration measurement and recording
systems
❍ System fault finding and continuity checking
❍ Acceleration, velocity and displacement calibration
Description
Type 4294 permits accurate adjustment of measuring instrumentation to a standard
acceleration level of 10 ms–2, thus calibrating the system for correct measurement of
other vibration levels. The reference signal may additionally be used for velocity and
displacement calibration, at 10 mms–1 and 10 µm respectively. The Calibrator embodies
an electromagnetic exciter driven by a crystal oscillator at a frequency of 159.15 Hz
(1000 rad s–1). Servo feedback via a small accelerometer on the underside of the vibra-
tion table is used to maintain a constant and accurate vibration level independent of
the mass of the transducer. To prevent overload, power for the calibrator is automati-
cally disconnected if a transducer mass of more than 70 grams is mounted on the table.
Use of the calibrator is very straightforward. The transducer is conveniently attached
to the calibrator table using a 10–32 UNF steel stud YQ 2963. Alternatively, the Mounting
Disc DB2996 (10 grams) supplied provides a convenient means of attaching transducers
manufactured with 3 mm threads or those fitted with a Mounting Magnet UA 0642. The
Mounting Disc also permits the attachment of transducers with either Beeswax or
Cyanoacrylate adhesive. The calibrator is actuated by pressing the small button on the
side of its housing. Following system adjustment, the calibrator is switched off by
pressing the button a second time. To prolong the useful life of its built-in battery, the
4294 automatically switches off after approximately 100 s.
4294
Compliance with Standards
CE-mark indicates compliance with: EMC Directive
, C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand
Safety EN 61010–1 and IEC 61010–1: Safety requirements for electrical equipment for measurement, control
and laboratory use.
UL 3111–1: Standard for Safety – Electrical measuring and test equipment
EMC Emission EN 50081–1and IEC 61000–6–3: Generic emission standard. Part 1: Residential, commercial and light
industry.
EN 50081–2and IEC 61000–6–4: Generic emission standard. Part 2: Industrial environment.
CISPR 22: Radio disturbance characteristics of information technology equipment. Class B Limits.
FCC Rules, Part 15: Complies with the limits for a Class B digital device.
EMC Immunity EN 50082–1 and IEC 61000–6–1: Generic immunity standard. Part 1: Residential, commercial and light
industry.
EN 50082–2 and IEC 61000–6–2: Generic immunity standard. Part 2: Industrial environment.
Note 1: The above is guaranteed using accessories listed in this Product Data sheet only.
Temperature IEC 60068–2–1 & IEC 60068–2–2: Environmental Testing. Cold and Dry Heat.
Operating Temperature: +10 to +40 °C (50 to 104 °F) for 10 ms–2 reference within ± 3%
–10 to +55 °C (14 to 131 °F) for 10 ms–2 reference within ± 5%
Storage Temperature: –25 to +70 °C (–13 to 158 °F)
IEC 60068–2–14: Change of Temperature: –10 to +55 °C (2 cycles, 1 °C/min.)
Humidity IEC 60068–2–3: Damp Heat: 90% RH (non-condensing at 30 °C (86 °F))
Mechanical Non-operating:
IEC 60068–2–6: Vibration: 0.3 mm, 20 m/s2, 10–500 Hz
IEC 60068–2–27: Shock: 1000 m/s2
IEC 60068–2–29: Bump: 1000 bumps at 400 m/s2
Enclosure IEC 60529 (1989): Protection provided by enclosures: IP54
Specifications – Calibration Exciter Type 4294
VIBRATION SYSTEM Mounting Thread: 10–32 UNF
Electromagnetic exciter with internal built-in accelerometer for
servo regulation of vibration amplitude POWER REQUIREMENTS
Frequency: 159.15 Hz ±0.02% (1000 rad s–1) Built-in Battery: One 9 V Alkaline Battery QB 0016 (IEC type
Acceleration: 10 ms–2 (RMS) ± 3% 6LR61)
Battery Life: Approximately 200 calibrations each lasting
Velocity: 10 mms–1 (RMS) ± 3%
Displacement: 10 µm (RMS) ± 3% approximately 100 s with automatic switching off at the end of
Transverse amplitude: less than 5% of main axis amplitude each calibration
Distortion: less than 2% for 10 to 70 gram load; less than 7% DIMENSIONS
for 0 to 10 gram. Use DB 2996 (10 g) with very light Length: 155 mm (6.1 in)
accelerometers to achieve 2% distortion Diameter: 52 mm (2.05 in)
Warm-up Time: Less than 5 seconds Weight: 500 grams (17.6 oz.) including battery and leather case
Signal Duration: 103 ±1 s with automatic stop
Long Term Stability: better than 1% per year for acceleration,
velocity and displacement; better than 10 ppm per year for Accessories Included
frequency
KE 0278 Leather Case
TRANSDUCER MOUNTING
QB 0016 9 V Battery
Maximum Load: 70 grams
YQ 2962 10–32 UNF Steel Stud
Mounting Torque: max. 0.5 Nm DB 2996 Mounting Disc Adaptor
01/05
Brüel & Kjær reserves the right to change specifications and accessories without notice.
BP 0184– 15
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