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Figure 5-4:
Diagram of the M8 connectors on an ELBRG layer.
Each independent channel contains programmable excitation, an eight-pole
Butterworth analog guard filter, a 16-bit A/D converter, software selectable digital
filtering and output sample rate options of up to 100 kHz.
The ELBRG layer supports full- and half-bridge types with a resistance from 100 to
10000 ohms and quarter-bridges with a resistance of either 120 or 350 ohms. All
bridge configurations are accomplished using programmable switches (i.e., there are
no jumpers), however, the quarter-bridge choice of 120- or 350-ohm completion
resistor is a factory installed option. A set of internal shunt resistors with selectable
shunt direction is available for calibration purposes.
For more information on setting up ELBRG input channels, see “Bridge” on page 113.
For information on wiring ELBRG inputs, see “ELBRG (Bridge Layer)” on page 206.
5.5 ELHLS (High Level Analog Layer)
The ELHLS offers four simultaneously sampled, high-level, differential analog inputs
through independent connectors. The ELHLS layer supports a wide variety of inputs
including thermocouples, strain gages, accelerometers, microphones and amplified
and unamplified transducers. Single channel IEPE (Integral Electronics Piezoelectric)
adapters and a variety of SMART modules are also available. Connect transducers to
the ELHLS individually using the M8 connectors located on the front panel.
Figure 5-5:
Diagram of the M8 connectors on an ELHLS layer.
Each independent channel contains programmable transducer power, an eight-pole
Butterworth analog guard filter, a 16-bit A/D converter, software selectable digital
filtering and output sample rate options of up to 100 kHz. The ELHLS also provides
400 milliwatts of transducer power supply with an adjustable supply voltage of 4-15
volts for every channel. Use the transducer power supplies in parallel for larger loads.
For more information on setting up ELHLS input channels, see “Simultaneous High
Level” on page 116. For information on wiring ELHLS inputs, see “ELHLS (High Level
Analog Layer)” on page 205.
5.6 ELNTB (Non-Isolated Thermocouple Layer)
The ELNTB provides non-isolated thermocouple inputs in one bank (A) of 16
channels. The ELNTB supports the four most common thermocouple types: J, K, T
and E. The user-specified thermocouple type for each channel is independent of the
other channels. The 16 channels share a common cold junction resulting in high
channel-to-channel accuracy, which is particularly valuable when measuring thermal
gradients.
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