If instruments equipped with a mains input chassis terminal are included in the set-
up, then ensure that all have their chassis connected to mains ground and that one
and only one of them has its chassis connected to signal ground.
Measuring Amplifier
2606, 2607, 2608
• • 1 Y-
= • • •
Signal
• it
*input
If instruments without a mains input chassis terminal are included in the set-up and
these are used free standing without their cabinets touching, then ensure that all of
them have their chassis connected to signal ground.
4. If instruments without a mains input chassis terminal are mounted in a metal instru-
mentation rack, together with one or more instruments that have a mains input
chassis terminal, then ensure that their chassis is disconnected from signal ground.
5. If instruments without a mains input chassis terminal are mounted in a metal instru-
mentation rack without an instrument having a mains input chassis terminal pres-
ent, then ensure that one and only one of them has its chassis connected to signal
ground.
6. Isolate the measurement transducer housing or disconnect the measurement system
signal ground from grounded measurement sources.
The signal ground and chassis of the Type 1618 are normally connected by the metal
strap between the ground terminals on the rear panel. If necessary the strap may be
removed to isolate the signal ground from chassis ground.
3.2. USE WITH MEASURING AMPLIFIER
The 1618 Band Pass Filter may be used with any Measuring Amplifier or Electronic
Voltmeter which is equipped with sockets for connection of an external filter. Suitable
types of Measuring Amplifier available from B & K are indicated in Fig.3.1. These have
an overall frequency range extending from 2 Hz up to 200 kHz and for sound, vibration
and voltage measurements may be connected with a wide range of measurement trans-
ducers and preamplifiers. The 1618 may be connected in series with, or in place of any
internal weighting network of the Measuring Amplifiers, forming a powerful measure-
ment set-up for octave and third octave frequency analysis of signals. The analyzed sig-
nal level can be read directly from built-in meter of the Measuring Amplifier. The basic
operating procedure is as described below.
t'•-• To Ext. Filter Input
To Ext. Filter Output • AO 0014/AO 0064
Band Pass Filter
1618
790099
Fig.3.1. B & K Measuring Amplifiers for use with Band Pass Filter
Type 1618
1. Carry out the necessary preliminary adjustments. See section 3.1 of this Instruction
Manual and the Instruction Manual for the particular Measuring Amplifier em-
ployed.
2. Connect the Filter Set and Measuring Amplifier as indicated in Fig.3.1.
3. On the Filter Set set the Power switch to "On" and the RANGE switch to "Lin".
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