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2.1.4. Vibration Meter Section
,.---------------Vibration M e t e r - - - - - - - - - - ,
Vibration Meter:
Auto Range:
Input
Sens.
MoiNo.
Level1
I
I
I
Level9
Set
Measured
Levels
Levet
- - - -
-
-
- -
Accel.
J
Vel.
I
Dtap.
Function
Preamp. Output
Fig. 2.5. Vibration Meter Keys and Display
"Input Sens.": Used to display the input sensitivity. The sensitivity is
set to the value selected using the input sensitivity selector on the rear
panel. All charge sensitivities can be adjusted by
+
5 to -8% by using
the thumbwheel.
"Set Levels": Selects the "Max. No." of vibration levels to be used in a
test. Once the number of levels (and consequently the number of
cross-over frequencies) has been set, the key is pressed to set "Level
1 ". Consecutive pressing of the key enables setting of each level in
turn. "Function" is used in conjunction with "Set Levels" to set the
required control function (A, V or D). When setting velocity or displace-
ment levels, the levels must be compatible with the measurement fre-
quency limits specified in chapter 1. Any attempt to run a test using
set levels which violate the specifications will result in an error mes-
sage. Refer to section 7.1 for further details of the error messages.
"Measured Level": Used to display the vibration or force level mea-
sured
by
the transducer connected to the Voltage or Charge Input on
the rear panel. Special Parameter 01 can be used to change the mea-
surement parameter units (from Sl to imperial, or vice versa).
"Function": Switches between "Acceleration", "Velocity" and "Dis-
placement" when setting the vibration levels or when measuring vibra-
tion. This function is disabled during a test. An auto range is automati-
cally included if the "Function" is changed during vibration measure-
ment (with "Measured Level" selected).
"Preamp. Output": Provides an output directly from the preamplifier,
before the charge sensitivity adjustment stage, for monitoring the con-
trol signal. Refer to the specifications in chapter 1 for the sensitivity
selection.
A single key on the right of the compression meter. It sets the vibra-
tion meter measurement range in accordance with the input level. This
function is only possible when "Measured Level" is selected and the
compression meter indicates the vibration level.
13
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