Use As A Vibration Meter - BRUEL & KJAER 1050 Instruction Manual

For open-loop operation follow the procedure for closed-loop operation, but disengage
the Compressor by pressing the "On/Off" key before commencing operation. When us-
ing the 1 050 in open-loop operation the output level increases, at a rate of 35 dB per
period of frequency, to the programmed Generator "Level" when "Operate" is pressed.
Therefore it is important to set the programmed Generator "Level" to a low value and
then increase the actual output level slowly by using the thumbwheel, in order to protect
the vibration exciter and test specimen.
3.3.2. Use as a Vibration Meter
24
The 1050 can be used to measure vibration in open-loop operation without the compres-
sor, or as a stand-alone vibration meter as shown in Fig. 3.2. This shows a Uni-Gain
Accelerometer being used to measure the vibration from an electric motor. To use the
1 050 as a vibration meter, proceed as follows:
Uni-Gain
Accelerometer
eg. Ty\~~·
Electric Motor
AO 0231
Vibration Exciter Control
1050
860862
Fig. 3.2. Using the Vibration Exciter Control Type 1050 for vibration
measurement
1. Connect the 1 050 mains supply following the safety precautions described in 3.1.3
and select Power "On". The front panel displays will light and the instrument will
perform a memory check. If Error 100 is displayed refer to section 7.1.
2. Connect the measurement accelerometer to the Charge Input of the 1 050 using the
1 0-32 UNF to TNC cable AO 0231.
3. Set the accelerometer "Input Sens." using the Input Sensitivity selector on the rear
panel.
4. Press "Input Sens." to display the transducer input sensitivity. Adjust the charge
sensitivity (if necessary) by between
+
5 and -8% according to the calibration chart
for the transducer.
5. Press "Measured Level". If the measurement parameter units need to be changed
(from Sl to imperial, or vice versa) include step 6.
6. Select Special Parameter 01 (refer to section 7.2) and use the thumbwheel to change
the units.
7. Select the vibration function to be measured using the "Function" key.
8. Set the 1 050 Generator "Frequency" to the lowest frequency to be measured. This
selects the position of the built-in high pass filter in the Vibration Meter.