BRUEL & KJAER 2305 - Motor Drive um 1018

ball so that this will expand the collet and lock the Contact Slider
in position.
VII. Connect the potentiometer to the balancing unit.
NOTE: The contact slider arrangement should be removed when the
analog voltage read-out is not in use, to prevent unneccessary wear of
the potentiometer .
C. Zero and Full Scale Adjustment.
Set the Level Recorder stylus to the zero dB position and adjust the
ZERO potentiometer for zero volts output from the balancing unit. Bring
the writing stylus to full scale position (50 mm movement) and adjust the
FULL SCALE potentiometer for the desired full scale output voltage
(1 to 10 volts) . Readjust the ZERO and FULL SCALE potentiometers
until the exact output voltage range is obtained.
D. Cleaning.
If needed, the potentiometer may be cleaned with a dry, fine-bristle
brush. Brush the potentiometer perpendicular to its length, brushing
parallel to its length tends to push the dirt between the windings and
may also damage the potentiometer.
SPECIFICATIONS
Range of Output Voltage: 0-1 V, 0-10 V DC or any intermediate range.
Adjustment of
Output Voltage Range: One 10-turns potentiometer for adjustment of zero.
Potentiometer:
Stability
of Output Voltage:
Filter for Contact Noise:
Power Supply and
Consumption:
Motor Drive UM 1018.
One 10-turns potentiometer for adjustment of full
scale.
Resistance 5000 Q.
600 windings over 50 mm length .
Linearity better than ± 0.2 . %.
Contact surface: gold.
Base material : hard glass fibre plate .
10 % variation in mains voltage results in less than
0.6 % change in output voltage.
RC-filters,
Cut-off 100 Hz (cis).
25 rnA from Level Recorder . 24 V DC supply .
This unit has be en design ed for synchronous operation of the Level Recorder
with the B & K vibration test ge nerators. It is an external motor whi ch is
screwed onto the record er drive sh a ft and driven by pulses from the
oscillator which also drive the sweep motor of the generator. Complete
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