Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 2511 Specifications

The B&K 2511 has been withdrawn from hire, the following information is for reference purposes only.

B&K 2511 : Portable Vibration Meter

Recommended Transducer :

Bruel & Kjaer 4370 piezoelectric accelerometer with a nominal sensitivity of 10 pC/ms^-2 ~ 100 pC/g

Measurement Ranges :

using the recommended B&K 4370 accelerometer.

Measurement	LLF *	Metric Ranges	Imperial Ranges
Acceleration :	0.3 Hz	0.002 - 100 ms-2	0.0002 - 10 g
Velocity :	3 Hz	0.02 - 1000 mm/s	0.001 - 100 in/s
Displacement :	10 Hz	0.0003 - 10 mm	0.00002 - 1 in

The above figures are for wide band measurements.
The minimum levels are RMS and are 6 dB (2 x) above the wide band instrument RMS noise level.
* LLF = Lower Limiting Frequency
If the next lower low frequency setting is selected, then the minimum limit for velocity measurements is a factor of 3 to 4 higher.
The next lower low frequency for displacement settings will increase the minimum limit by 10 times.

Accuracy :

including accelerometer is ± 5 % absolute overall within linear ranges.

Filters :

High Pass Filter : 3-pole Butterworth, fall off 18 dB/octave
Low Pass Filter : 2-pole Butterworth, fall off 12 dB/octave

Detector : Quasi RMS :

True reading indicated for sinusoidal signals with crest factor < 3
Time Constants : 1 s and 10 s switchable
Time Constants in Max Hold : 1 s
Max Hold drift : < 10 % per 5 minutes with FSD

Detector : True Peak-to-Peak :

Time Constants : 1 s and 10 s switchable
Max Hold drift : < 10 % per 30 minutes with FSD
Rise Time : > 25 µs : 15 kHz LP filter

Dynamic Range :

for both detectors is 40 dB

External Filter Sockets : 2 x BNC

Signal level : 1 V PEAK or RMS
Input Socket Impedance : 16 kΩ

Recorder Outputs :

Output Impedance : 1 kΩ
AC : 2.7 V RMS for FSD. Overload 6.8 V peak
DC Log : 2 V for FSD, 0.05 V/dB. Overload 2.25 V
DC Lin : 3 V for FSD. Overload 4.5 V

Meter Calibration :

Internal Oscillator : 80 Hz

Internal Power Supply :

Battery : 4 x 1.5 V - D cells, IEC type R20
Battery Life : 15 hours with Alkaline batteries

Environmental :

Temperature Range : -10 °C to +50 °C
Humidity Range : 0 to 95 %RH, non condensing
Electromagnetic : fields up to 100 A/m increases noise floor < 14dB

Size and Weight :

excluding feet, knobs etc.
Height : 133 mm
Width : 210 mm
Depth : 200 mm
Weight : 2.4 kg
E&OE - specifications subject to change without notice.
* Our standard hire charges are based on a 4-day minimum period, details other options.