Sweep And Output Controls - BRUEL & KJAER 1053 Instruction Manual

2.1.5. Sweep and output controls
Generator Output:
Sweep Control:
14
r--:
Sweep Control ---,
,...----Generator Output------,
Stop Down Up Stand-by Operate Operate 0- 10 V
-20dB
- - - - - - - - - - - -
•
- - - -
- -
,
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- -
,
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Reset Reset
LLF ULF
I I
Fig. 2.6. Operating keys and output connection
"Operate": Initiates a test (when compressor is "On") with all test pa-
rameters set according to their selected values. If the test parameters
are not compatible with the measurement ranges given in the speci-
fications, an error message will result (refer to section 7.1 for further
details). When the compressor is "Off", the generator output is set to
the programmed level.
"Operate -20 dB": Performs the same function as "Operate", but the
maximum generator-output voltage is limited to 1 V RMS. Each "Set
Level" is reduced by 20 dB during the test.
"Stand-by": Interrupts the sweep and smoothly attenuates the genera-
tor output to the full compression level i.e. -120 dB. The controller will
automatically revert to stand-by mode once the total number of
sweeps have elapsed, or on violation of the safety limits. In this case,
the Sweep "Count Total· Elapsed" or Compressor "Safety Limits"
LED will flash to indicate the cause of the test interruption.
"0-10 V": A BNC socket used to connect the generator output signal to
a vibration exciter via a power amplifier. The output level is continu-
ously variable from 0 to 10 V RMS, the amplitude being controlled ei-
ther manually or by the compressor. This socket is duplicated on the
rear panel.
"Up": Starts an upward frequency sweep when the generator is in op-
eration. When in stand-by mode with Generator "Frequency" selected,
it sets the generator frequency to the sweep upper-limit.
"Down": Starts a downward frequency sweep when the generator is in
operate mode. When in stand-by mode with Generator "Frequency"
selected, it sets the generator frequency to the sweep lower-limit.
"Stop": lnterupts the sweep to hold the frequency at the actual gen-
erator frequency. Press "Up" or "Down" to continue the sweep.