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2.1.3. Compressor section
Reset
II
Compressor:
12
"Frequency":
Selects the generator frequency. The range is from the
lower-sweep
limit to the upper-sweep limit. Press the key consecu-
tively to switch between a zero, one, two and three decimal display.
The frequency
resolution
is 1,19 mHz and consequently if a three deci-
mal frequency-display is selected, approximately every sixth last-digit
will
not
be displayed.
100
80
60
dB
40
20
0
Compr.
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1
Auto Range
25
20
15
dB
10
5
0
Vibr.level -
.....--------Compressor--------,
Safety Limits
Rate
Max. Speed
On/Off
Lower
Upper
-
-
-
-
" - - -
' - -
Fig. 2.4. Compressor keys and meter
"Safety Limits": Selects the lower and upper safety limits to the com-
pressor safety window around the vibration test level. Press the key to
switch between the
"Lower"
and "Upper" limits. The safety limits may
be selected in the range from 3 to 6 dB, or alternatively the safety
window may be switched off by entering a value greater than 6. On
limit violation, the safety control disables the generator by smoothly
attenuating the drive signal. This automatically sets the 1053 to stand-
by mode. The safety window can be momentarily switched off at the
cross-overs (refer to section 7.2).
"Rate":
Selects the compressor regulation rate, measured in dBs-
1
/Hz.
The regulation speed increases in proportion to frequency. This pa-
rameter
controls the
rate
at which the regulation speed increases. The
selection range is 0,1 - 0,3 - 1 - 3 dBs-
1
/Hz, or the rate can be
switched off so that the regulation speed is set according to the maxi-
mum speed at all frequencies. To switch off the compressor rate, enter
a
value greater than 6 dBs-
1
/Hz.
"Max.
Speed": Selects the maximum regulation speed. The selection
range
is 1, 3, 10, 30,
100,
300 and 1000dB/s.
Refer to section 6.2 for considerations governing the choice of com-
pressor speed.
"On/Off":
Selects the mode for controlling the level of the generator
output. This can be controlled either manually or by the compressor.
This
key is disabled during operation.
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