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ed to ground either via the switch or via the external equipment used by the com-
pressor. In cases where the voltage or charge input sockets are not grounded by
external equipment the switch must be set to "Signal Gnd" .
.&
WARNING: The Vibration Exciter Control Type 1 050 is designed to be operated with its
Signal Ground
&
Chassis at zero earth potential. Never let the signal ground terminals,
socket screens or chassis float at other than approximately zero earth potential, as this
will impair the operating safety of the apparatus and may damage it.
3.2. INITIAL SET -UP PROCEDURE
3.2.1. Setting the Front Panel Set-up Parameters
3.3. OPERATION
Prior to conducting a swept sine test using the Vibration Exciter Control Type 1050, it is
necessary to set all the front panel test parameters. This is achieved either manually or
via the IEEE interface using a desk-top calculator or Digital Cassette Recorder Type
7400. Refer to sections 4.2 and chapter 5 for further details of the digital interface.
In the manual mode it is convenient to follow the Front Panel Set-up Sequence, which
leads the user through the front panel test parameters one at a time in a logical order.
Before using the Set-up Sequence, the user must select a Front Panel Set-up "No." in
which the test conditions will be automatically stored. These conditions can then be
recalled at a future date by selecting the same Front Panel "No.".
The Front Panel Set-up Sequence is initiated by pressing Front Panel Set-up "Parame-
ter" which facilitates setting of the "First" parameter: Sweep "Rate". Once the "Rate"
has been set, the Front Panel Set-up "Parameter" key is pressed for a second time to
initiate setting of the "Next" parameter etc. When all the parameters have been set the
1050 will display the Generator "Frequency".
In order to keep the memory battery fully charged for continuous storage of the Front
Panel Set-ups, it is necessary to keep the 1 050 powered for at least 2 hours/week.
3.3.1. Use as a Vibration Exciter Control
22
The Vibration Exciter Control Type 1050 can be used in either open or closed-loop
operation. Closed-loop operation uses a compressor (feedback) loop to regulate the
power supplied to the vibration exciter so that a constant level of vibration can be
attained. This type of
operation·
is described -with reference to Fig. 3.1.
1. Connect the "0-10V" output, via the front or rear panel socket, to the power amplifi-
er using cable AO 0087 and connect the power amplifier to the vibration exciter.
2. Mount a control accelerometer on the vibration exciter or fixture and connect it to
the Charge Input on the rear panel of the 1 050.
3. Set the accelerometer "Input Sens." using the Input Sensitivity selector on the rear
panel.
4. Check that the vibration test system is properly grounded according to section
3.1.4.
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