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(Compression)
Signal
-·
-
--·
-
--
-
AO 0087
•
@
• •
@
•
~~~~!!..:t-~t
ii
.
~
Vibration Exciter
Control 1 050
Power Amplifier
2708
AO 0231
Accelerometer
e.g
.
4384
Vibration Exciter
4802
+
Head 4818
860710
Fig. 3.1. Basic Vibration Test System
5. Switch the 1050 and power amplifier "On". The front panel of the
1050
will light and
the instrument will perform a memory check. If Error 100 is displayed refer to sec-
tion7.1.
6. Press "Input Sens." to display the transducer input sensitivity. Adjust the charge
sensitivity by between
+
5 and -8% (if necessary) according to the calibration chart
for the accelerometer.
7. Press Front Panel Set-up "No." and select one of the test programmes available.
8. Select Special Parameter 01 (refer to section 7.2) and use the thumbwheel to change
the measurement parameter units (from Sl to imperial, or vice versa) if necessary.
9. If any test parameter, in the selected front panel, is not in accordance with the
requirements, select the parameter by pressing the associated key and set it to the
required value. Alternatively, follow the set-up sequence described in section 3.2.1.
10. Set the power amplifier to "Load On" and adjust to full gain with reference to its
instruction manual.
11. Press the "Operate" key. (In case of an error message occuring, refer to section
7.1.)
Once the 1050 starts generating an output, the ouput level will increase towards the
programmed Generator "Level" at the actual compressor speed. When the "Mea-
sured Level" is within "3dB" of the "Set Level", the Compressor control becomes
active (indicated when the compression meter ceases to flash). If the programmed
Generator "Level" is set low, then the actual output level should be gradually in-
creased (using the thumbwheel) to reach the point where the compressor becomes
active. This is useful as a safety precaution to protect the vibration exciter. The
power amplifier gain can be decreased so that the compressor operates in the
upper part of its dynamic range. However, this limits the maximum output capability
and consequently may cause safety errors during the running of the test.
12. To initiate an automatic frequency sweep press Sweep Control "Up" or "Down".
23
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