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2.1.2. Generator Section
Sweep:
Generator:
•
Hz
dB
Echo
I
,,
-,
,- ,-
I
,_,
=I '='· 1=1
Hz s
dB/s
Aux
Oct/mm
dB/s
Hz
. . . - - - - - - - - S w e e p - - - - - - - - ,
r -
Generator----,
Rate
Count
Total• Elapsed
Lin.
Lower
.
I
Log.
Upper
Freq.1
I
I
I
Freq.
8
Level Frequency
Decimals
0
1
2
3
r-----
Digital Interface---"""
Output
Input SRQ/Addr.
r - -
Front Panel
Set-up~
No.
Parameter
•
Remote
Field Entry
Enable
Disable
Fig. 2.3. Generator Keys and Display
First
Next
"Rate": Selects the frequency sweep rate. Press the key to switch be-
tween "Lin." and "Log." sweep rates.
"Count Total· Elapsed": Selects the number of frequency sweeps re-
quired in the test programme and simultaneously displays the number
of sweeps elapsed. The range for the total number of sweeps is from 1
(plus the number of elapsed sweeps) to 9999, or the test can be con-
tinuous (by setting a value of 10 000, or more). The elapsed number of
sweeps is reset when the total number of sweeps is changed using the
keyboard. It cannot be changed by using the thumbwheel.
"Limits": Selects the lower and upper frequency sweep limits. These
are selectable in the range 1 Hz to 10kHz with a minimum sweep range
of 0,3 Hz. Press the key to switch between the "Lower" and "Upper"
limit.
"Cross-overs": Selects the vibration meter cross-over frequencies.
Consecutive pressing of the key enables setting of each cross-over
frequency in turn. The number of cross-overs (0 to
8)
is determined by
the number of vibration levels to be used in the test (refer to section
2.1.4). The frequency range for the cross-overs is from 1,1 Hz to
9999,6 Hz. The smooth cross-overs can be calculated and set by press-
ing the key for 2 seconds.
"Level": Selects the programmed level when in stand-by mode. When
in "Operate" it displays the actual generator output level (controlled
manually or by the compressor). The range is from -1 00 to 0 dB rela-
tive to the maximum output capability.
11
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