Toshiba HHGP1 Bedienungsanleitung
6F2S0738
INSTRUCTION MANUAL
GPS RECEIVER UNIT
HHGP1
©TOSHIBA Corporation 2001
All Rights Reserved.
( Ver. 1.6 )
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Safety Precautions
Before using this product, please read this chapter carefully.
This chapter describes the safety precautions recommended when using the GPS receiver unit
type HHGP1. Before installing and using the equipment, this chapter must be thoroughly read
and understood.
Explanation of symbols used
Signal words such as DANGER, WARNING, and two kinds of CAUTION, will be followed by
important safety information that must be carefully reviewed.
Indicates an imminently hazardous situation which will result in death or
serious injury if you do not follow the instructions.
Indicates a potentially hazardous situation which could result in death or
serious injury if you do not follow the instructions.
CAUTION Indicates a potentially hazardous situation which if not avoided, may result in
minor injury or moderate injury.
CAUTION Indicates a potentially hazardous situation which if not avoided, may result in
property damage.
DANGE
R
WARNING
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•Installing arrester
Install a surge arrester between the antenna and the GPS receiver and ground it in accordance
with the guidelines in this manual. Otherwise, it may cause electric shocks, injury or
malfunction.
•Exposed terminals
Do not touch the terminals of this equipment while the power is on, as the high voltage generated
is dangerous.
•Residual voltage
Hazardous voltage can be present in the DC circuit just after switching off the DC power supply.
It takes approximately 30 seconds for the voltage to discharge.
•Fibre optic
When connecting this equipment via an optical fibre, do not look directly at the optical signal.
CAUTION
•Earth
The earthing terminal of the equipment must be securely earthed.
CAUTION
•Operating environment
The equipment must only used within the range of ambient temperature, humidity and dust
detailed in the specification and in an environment free of abnormal vibration.
•Ratings
Before applying the DC power supply to the equipment, check that they conform to the
equipment ratings.
•Connection cable
Carefully handle the connection cable without applying excessive force.
•Modification
Do not modify this equipment, as this may cause the equipment to malfunction.
•Disposal
When disposing of this equipment, do so in a safe manner according to local regulations.
DANGE
R
WARNING
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Contents
Safety Precautions 1
1. Introduction 5
2. Characteristics 5
3. Configuration 6
3.1 Configuration of GPS Receiver Unit 6
3.2 Outline of GPS Receiver Unit and Function 7
4. Handling 8
4.1 Setting the GPS Receiver Unit 8
4.2 How to Turn on the Power 9
4.3 Checking the 1PPS Signal 9
5. Operation 10
5.1 1PPS Signal Output 10
5.2 Time Data Output 11
6. Installation 12
6.1 Receipt of GPS Receiver Unit 12
6.2 Installing GPS Receiver Unit 12
6.3 Installing Antenna 12
6.4 Installing Surge Arrester 15
6.5 Installing Fibre Optics 15
6.6 Connecting the Power Supply and the Earthing Terminal 16
7. Preparation for Installation 17
7.1 Selecting an Antenna and Cables 17
7.2 Selecting Coaxial Cables and Conversion Adapters 17
7.3 Selecting an Antenna Installation Location 18
8. Maintenance 19
8.1 Regular Maintenance 19
8.2 Troubleshooting 19
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Appendix A Outline of GPS Rceiver Unit 21
Appendix B Technical Data 23
Appendix C Specification of Recommended Antenna and Arrester 27
Appendix D Supplement 31
The data given in this manual are subject to change without notice. (Ver. 1.6)
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1. Introduction
The GPS (Global Positioning System) receiver unit is a device that receives the information from
satellites and outputs time signals synchronous to UTC (Universal Coordinated Time) to external
devices. The GPS receiver unit provides multiple outputs with optical signals for noise
immunity.
2. Characteristics
■Highly accurate time signal output
Realizes a precision with respect to ±2µs for UTC (UTC: Universal Coordinated Time)
(excluding the propagation delay time on the cable).
■Reduced cabling work
Adopting the signal superimposition method, the unit can be connected to an external device
with a single optical fibre only.
■Application to a large system
Equipped with eight ports for output, the time distribution can be made to multiple devices
separated from each other by a maximum of 1 km.
■High reliability
Aimed at reducing the number of parts through high-integration circuits and high-density
mounting technology, thus securing high reliability.
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3. Configuration
3.1 Configuration of GPS Receiver Unit
Figure 3.1.1 shows the configuration of the GPS receiver unit.
The GPS receiver unit receives electromagnetic signals from satellites through an antenna and
outputs time data to external devices. Through an internal receiver, the unit generates serial time
data and 1-second pulses (1PPS signals), based on the received electromagnetic signal. Each
1PPS signal occurs at the instant in time given by its accompanying frame of serial data.
To reduce the number of cables to external devices, time data and 1PPS signals are superimposed
through a mixing circuit before being output to the optical fibre.
Figure 3.1.1 Configuration of GPS Receiver Unit
Receiver
Mixing Circuit
E/O
Antenna
1 Pulse per second
(1PPS)
E/O E/O E/O
Backup
Capacitor
Fibre-optic Cable
Noise
Filter +5V
Power supply
DC/DC
Converter
Time data
E/OE/OE/OE/O
0V
+48V
0V
Electrical-to-optical
Converter
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3.2 Outline of GPS Receiver Unit and Function
Figure 3.2.1 shows outline and functions of GPS receiver unit.
No. Device Indication Functions
①Yellow LED 5 V Turns on when the power (5Vdc) is supplied.
②Yellow LED 1PPS OUT Blinks when 1PPS signals are output synchronously with UTC.
③Red LED ERROR Turns on when the internal crystal oscillator stops.
④DIP switches DSW Set the GPS receiver unit settings. During operation, these DIP
switches are covered to prevent erroneous operations.
⑤Signal output ports OPT.OUT Outputs time signals. The optical fibre is connected here.
⑥Power supply switch INPUT Turns on or off the power of the GPS receiver unit.
⑦Terminal block __ The 48V dc power is applied and the earth cable is connected.
P: 48Vdc, N: 0Vdc, E: earth
⑧ Antenna terminal ANT.IN The antenna cable is connected.
Figure 3.2.1 Outline and Functions of GPS Receiver Unit
⑤⑥⑦
⑧
②①③
④
REAR VIEW
FRONT VIEW
48V
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4. Handling
4.1 Setting the GPS Receiver Unit
The GPS receiver unit is set in accordance with the requirements of the system by using the DIP
switches located on the front panel of the unit.
To prevent erroneous operations, the DIP switches are protected with a cover. As shown in
Figure 4.1.1, when the cover is rotated after loosening the cover screw with a screwdriver, the
switches are exposed thus making it possible to handle them. Switches are handled with a
sharp-pointed object such as a screwdriver and set to “ON” or “OFF” by pushing them up or
down respectively. After accessing the switches, tighten the cover screw to its original state.
DSW
１２３４
Figure 4.1.1 Switch Operation Method
Four switches are numbered 1 to 4 from left to right. (The numbers are indicated on their
respective switches.)
Table 4.1 shows the function and setting of each switch. (All the switches are set to “OFF” for
default setting.)
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