Model 6013/6014
+In
-In
Guard
Thermocouple
+In
-In
+Exc
-Exc
Ecom
Guard
+12/15
-12/15
Com
DC LVDT
Out
Out
+In
-In
Guard
Voltage Signal
+In
-In
Guard
Shunt
+In
-In
Guard
High Voltage
with Option A
4-5.4 Current Shunt
The shunt measures current as the voltage drop
across a precision resistance. A four terminal
connection is required to prevent any voltage drops in
the measurement leads, +In and -IN. Care must be
taken that the potential from ground (ANLG COM)
does not exceed the amplifier’s common mode
potential, ±10 Volts. Guard is usually connected to
one side of the shunt or ground.
4-5.5 DC-Powered Transducers
This category includes a variety of transducers that
have built-in electronic measurement circuits and
require DC power, for example DC-LVDTs. The
outputs are usually high-level voltage signals and are
connected to the +In and -In. Being differential, the
6013’s amplifier will prevent any ground current loops
in the signal paths even if the transducer is single
ended, that is it shares one output with power
common. Section 4-2.5 describes how to configure
the 6013 for various supply voltages. Shielding may
not be critical assuming the output signals are high-
level. However, for low-level signals and as a matter
of good practice for high-level signals as well, a guard
shield should be employed at least for the signal
leads. It should be connected at the transducer end
to Ecom or ground.
4-5.6 High Voltage Inputs
Option A is a 100:1 precision input attenuator that
allows measuring voltages higher than the amplifier’s
full scale. Installed at the factory, it precedes the
input protection circuits. It is not recommended for
applications exceeding 100 Volts. The attenuator is
not supported in PI660, requiring measurements to be
manually adjusted for its presence.
Care must be taken not to exceed the amplifier’s
common mode volta
e limit when usin
the
floating above ±10 Volts. It is usually best to use one
input of the attenuator at ground.
Likewise, the guard must be limited to within ±10
Volts of analog common and either input. Assuming
one leg of the attenuator is grounded, guard should
be connected to the same ground as shown.
4-6 6014 ICP ACCELEROMETER, AC/DC
COUPLED INSTRUMENTATION AMPLIFIER-
DIGITIZER
The 6014, shown on the next page, has eight
channels of AC or DC coupled programmable gain
instrumentation amplifier, filter and sample & hold.
The high level output signals are multiplexed into a
16-bit analog to digital converter and output to the
6000’s data bus.
Each channel includes a constant current source for
powering two-wire transducers that have integral
electronics such as ICP and IES accelerometers or
similar in-line charge-to-voltage converters. Power fo
the constant current source (24-30 Volts) is provided
by the user or an optional power supply in the
enclosure.
Calibration may be performed by substituting a
precision input from a traceable source. Inputs can
be switched to the 6000’s voltage calibration bus and
attenuated to match gain settings.
4-6.1 Transducer Excitation
Constant current is provided for transducers with
integral electronics. A 6mA constant current source
supplies power to the transducer using the signal
input lines. The instrumentation amplifier input must
be AC coupled to block the DC voltage that would
otherwise overload its input. This mode is only useful
for signals above 3 Hz.
An external power supply or optional supply in the
enclosure is required for constant current. If the
optional
6013 Typical Inputs
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