Bruel And Kjaer 2511

Specifications:

Recommended Transducer : Bruel & Kjaer 4370 piezoelectric accelerometer with a nominal sensitivity of 10 pC/ms^-2 ~ 100 pC/g Measurement Ranges : - with 4370 accelerometer.

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. 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 s : 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