Precision Digital Corporation ProtEX-MAX PD8-6100, Instruction Manual

Page: 25 / 64

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
25
Signal Connections
Signal connections are made to a six-terminal
connector labeled SIGNAL. The EX+ and EX-
terminals are used to sense the sensor excitation
voltage for ratiometric operation when the sensor is
powered externally (switch 1 is off).
Switch Configuration
Setup and programming is performed both through
the programming buttons and switch settings shown
below. The switch configuration must correspond to
the
Setup and Programming starting on page 30
(same range, type, etc.).
Figure 8. Strain Gauge Configuration Switch
Excitation (Switch 1)
The excitation switch designates whether the meter
will use its internal power supply or an external power
supply.
OFF Excitation
External
Excitation
When switch is
turned OFF, an
external power
supply is used.
ON Excitation
Internal
Excitation
When switch is
turned ON, the
ProtEX-MAX's power
supply is used.
Range (Switch 2)
The range switch adjusts the gain of the internal
circuitry. Narrower ranges require more amplification.
OFF Range
Lower
internal
gain
Turn this switch OFF
for the following input
ranges: 150, 300,
±150, or ±250 mV.
ON Range
Higher
internal
gain
Turn this switch ON
for the following input
ranges: 15, 30, ±15,
or ±25 mV.
Polarity (Switch 3)
The polarity switch selects whether the range is
unipolar and starts at zero (i.e. 0 to 30 mV) or bipolar
and starts at a negative value, or below zero (i.e. -15
to +15 mV).
OFF Polarity
Range
starts
below zero
(bipolar)
Turn this switch OFF
for the following input
ranges: ±15, ±25,
±150, or ±250 mV.
ON Polarity
Range
starts at
zero
(unipolar)
Turn this switch ON
for the following input
ranges: 15, 30, 150,
or 300.
Source (Switch 4)
The source switch tells the ProtEX-MAX whether the
input is a strain gauge bridge or it is a signal from a 2
or 4 wire transducer, or mV source (i.e.
Figure 11. mV
Transducer Input Connections , page 26 )
OFF Source
Source is
strain
gauge
bridge
Turn this switch
OFF if the source
is a strain gauge
bridge
ON Source
Source is
mV input
transducer
Turn this switch
ON if the
connected source
is a transducer*
*Ratio should be set to NO in Setup Input Menu
3 4
COM SG- F4 SG+EX-
3 4 1 2 5
EX+
6
SIGNAL