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Helios PD2-6100 Strain Gauge, Load Cell, and mV Meter
Power Connections
Power connections are made to a two-terminal
connector labeled POWER. The meter will operate
regardless of DC polarity connection. The + and -
symbols are only a suggested wiring convention. There
are separate models for low voltage and high voltage
power. See Ordering Information on page 6 for
details.
POWER
+ -
Required External Fuse:
5 A max, 250 V Slow Blow
Figure 11. Power Connections
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 23
(same range, type, etc.).
SIGNAL
1
2
3
4
5
6
F4
COM
EX+
SG-
SG+EX-
Figure 12. 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.
External
OFF
Excitation
Excitation
Internal
ON
Excitation
Excitation
AC or DC
POWER
3
4
When switch is
turned OFF, an
external power
supply is used.
When switch is
turned ON, the
Helios's power
supply is used.
17
Range (Switch 2)
The range switch adjusts the gain of the internal
circuitry. Narrower ranges require more amplification.
Lower
OFF
Range
internal
gain
Higher
ON
Range
internal
gain
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).
Range
starts
OFF
Polarity
below zero
(bipolar)
Range
starts at
ON
Polarity
zero
(unipolar)
Source (Switch 4)
The source switch tells the Helios whether the input is
a strain gauge bridge (i.e. Figure 15. Multiple Strain
Gauges Connected Through Junction Box, page 18),
or it is a signal from a 2 or 4 wire transducer, or mV
source (i.e. Figure 16. mV Transducer Input
Connections, page 18)
Source is
strain
OFF
Source
gauge
bridge
Source is
ON
Source
mV input
transducer
*Ratio should be set to NO in Setup Input Menu
Instruction Manual
Turn this switch OFF
for the following
input ranges: 150,
300, ±150, or ±250
mV.
Turn this switch ON
for the following
input ranges: 15, 30,
±15, or ±25 mV.
Turn this switch OFF
for the following
input ranges: ±15,
±25, ±150, or ±250
mV.
Turn this switch ON
for the following
input ranges: 15, 30,
150, or 300.
Turn this switch
OFF if the source
is a strain gauge
bridge
Turn this switch
ON if the
connected source
is a transducer*
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