BRUEL & KJAER 1050 Instruction Manual page 26

Vibration Meter Output
to External Filter
Vibration Meter External
Filter On/Off
Ground
External Filter
Output to Compressor
Compressor External
Filter On/Off
860728
Fig. 2. 11. External Filter DIN socket pin connections (viewed externally)
Log. DC Output:
Voltage Input:
Charge Input:
Floating/Grounded Input:
Input Sensitivity:
18
The filters are inserted in the respective circuits when the appropriate
pin (4 for the compressor and 6 for the vibration meter, as shown in
Fig. 2.11) is connected to ground potential (pin 2 or 8). Otherwise the
filters are bypassed by the 1050. Nominal filter in/out signal voltages
are 1 V RMS and 5 V peak (max.).
When the Slave Filter Type 5888 is used, selection of the filter band-
width and the insertion or bypassing of filters is controlled from the
front panel of the 1 050 using the Special Parameters 05, 06 and 07
respectively. Refer to section 7.2 for further details.
A
BNC socket providing 0 to 10V, 200mV/dB. This can be used for
supplying the vibration meter signal to the Y -axis of an X-Y or Level
Recorder. The output voltage is a logarithmic representation of the
vibration level measured by the transducer connected to the voltage or
charge input.
A
BNC socket for input of a voltage signal from a conditioning amplifi-
er to the vibration meter and compressor. The Input Sensitivity must
be set to 1 mV /ms-
1
or 1 mV /N. Refer to chapter 1 for input impedance
and maximum input specifications.
A
TNC socket for input of a charge signal from a piezoelectric trans-
ducer to the charge preamplifier. The "Charge Input" is suitable for
direct connection of BrOel
&
Kjoor force transducers and Uni-Gain®
accelerometers. Refer to chapter 1 for maximum input specifications.
A two position switch which selects either a floating input amplifier
ground or an input amplifier ground connected to the signal ground.
A
floating ground is used to minimize ground loop problems. In this case
the input amplifier ground must be connected to the signal ground
externally, e.g. via the vibration exciter and power amplifier. Refer to
section 3.1.3 for further details.
A seven position switch for selection of the voltage and charge input
sensitivity. The sensitivity value is shown on the front panel vibration
meter display when the Vibration Meter "Input Sens." key is pressed.