2-6 / Installation
2808B
2.5 WIRING OF 1-5V SIGNAL/POWER LOOP
The 1-5V signal/power loop can be powered in two ways, by the receiving device (controller,
recorder, etc.), or by an external supply. Provide a setup similar to that shown in either
Figure 2-4 or 2-5. Apply +24V across the + and - terminals of the Transmitter as shown,
whether supplied by an external supply, or by the receiving device. Next, connect the 1-5V
output, or the terminal block labeled V to the input of the device. Notice: Unlike the current
loop, this input must be analog ground referenced, and not passed through a sampling
resistor.
Signal Shielding
: Use twisted, three-wire, shielded cable covered by insulating material for
the signal/power wiring. For further information regarding signal shielding, consult section
2.4.
2.6 EFFECTS OF LEAD & LOAD RESISTANCE & SUPPLY
VOLTAGE
The total loop resistance consists of the load (loop resistor) plus the resistance of both
conductors in the signal/power loop. For any given power supply voltage, the total loop
resistance must be kept within the specified limits. The graphs of Figures 2-6 and 2-7
illustrate the minimum and maximum loop resistance that may be used with various
supply voltages for models with and without digital indicators.
Figure 2-6 - Transmitter without Digital Indicator
Содержание Bristol 2808 Series
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Страница 14: ...1 2 Introduction 2808B Figure 1 1 2808 XXB Transmitters ...
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Страница 23: ...2808B GP Transmitters 1A 7 Figure 1A 5 Overall Dimensions Model 2808 15B With Neck Type Mounting Bracket ...
Страница 24: ...1A 8 GP Transmitters 2808B Figure 1A 6 Overall Dimensions Model 2808 16B With Neck Type Mounting Bracket ...
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Страница 32: ...1B 2 DP Transmitters 2808B Figure 1B 1 Model 2808 35B Figure 1B 2 Transmitter Assemblies ...
Страница 37: ...2808B DP Transmitters 1B 7 Figure 1B 4C Dimensions for Model 2808 35B Transmitter With Manifold Adapter Option ...
Страница 40: ...1B 10 DP Transmitters 2808B Figure 1B 6 Transmitter Housing Rotation Diagram ...
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Страница 57: ...2808B Calibration 3 3 Figure 3 2 Calibration Adjustments ...
Страница 60: ...3 6 Calibration 2808B TABLE 3 A COARSE ZERO SWITCH SETTINGS Elevation ...
Страница 61: ...2808B Calibration 3 7 TABLE 3 B COARSE ZERO SWITCH SETTINGS Suppression ...
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Страница 68: ...4 2 Service 2808B Figure 4 1 Using Internal TEST Terminals to Measure Current ...
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Страница 81: ...Appendix B Page 5 Loop Powered Indicator Figure 2 2 Loop Powered Indicator Installation Diagram ...
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Страница 127: ...ESDS Manual S14006 4 15 92 CARE AND HANDLING OF PC BOARDS AND ESD SENSITIVE COMPONENTS BRISTOL BABCOCK ...
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