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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
- - - - - -
---
- - - - -
---~-
•
- -
---
- -
Reset
Reut
LLF
ULF
I
I
Fig. 2.6. Operating Keys and Output Connection
"Operate": Initiates a test (when compressor is "On") in accordance
with all the set test parameters. If the test parameters are not compat-
ible with the measurement ranges given in the specifications, an error
message will result (refer to section 7.1 for further details). When the
compressor is "Off", the generator output level is set to the program-
med level.
"Operate -20dB": Performs the same function as "Operate", but with
the maximum generator output voltage limited to 1 V RMS. Each "Set
Level" will be reduced by 20 dB during the running of the test.
"Stand-by": Interrupts the sweep and smoothly attenuates the genera-
tor output level to the full compression level i.e. -120 dB. The control-
ler 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.
"0-10V": A BNC socket used to connect the generator sine output
signal to a vibration exciter via a power amplifier. Output 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 Lim-
it".
"Stop": lnterupts the sweep to hold the frequency at the actual gener-
ator frequency. Press "Up" or "Down" to continue the sweep.
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