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AO 02 3 1
Accelerometer
~----------____;,.=-.:.=.:....__
_ ___,
e.g. 4384
Feedback (Compression) Signal
i.:
~
i • @
.
•
~
.
•
.
.
Vibration Exciter
Power Amplifier
Vibration Exciter
Control 1053
2708
4802
+
Head 4818
Fig. 3. 1. Basic vibration-test system
870427
5. Switch the 1053 and power amplifier "On". The front panel of the 1053 will light and
the instrument will perform a memory check. If Error 1 00 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 (refer to the instruction
manual).
11. Press the
"Operate"
key. (In case of an error message occurring, refer to section
7.1.)
Once the 1053 starts generating an output, the ouput level will increase towards the
programmed generator level at the actual compressor speed. When the measured
level is within "3 dB" of the set level, the compressor control becomes active (indi-
cated when the compression meter ceases to flash). If the programmed generator
level is set low, then the actual output level should be gradually increased (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 test.
12. To initiate an automatic frequency sweep, press Sweep Control "Up" or "Down".
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-
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