National Instruments C Series User manual

GETTING STARTED GUIDE
NI 9467
C Series GPS Synchronization Module

This document explains how to connect to the NI 9467.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9467. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
Safety Guidelines
Operate the NI 9467 only as described in this document.
Caution Do not operate the NI 9467 in a manner not
specified in this document. Product misuse can result in
a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
way. If the product is damaged, return it to NI for
repair.
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Safety Guidelines for Hazardous Locations
The NI 9467 is suitable for use in Class I, Division 2, Groups A,
B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4
and Ex nA IIC T4 hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9467 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.
Caution Do not disconnect I/O-side wires or
connectors unless power has been switched off or the
area is known to be nonhazardous.
Caution Do not remove modules unless power has
been switched off or the area is known to be
nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
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Caution For Division 2 and Zone 2 applications,
install a protection device between the external power
supply and the Vsup pin. The device must prevent the
Vsup-to-COM voltage from exceeding 50 V if there is
a transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9467 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx UL 14.0089X certified. Each NI 9467 is marked II 3G
and is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9467
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
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Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
stated in the product specifications. These requirements and
limits provide reasonable protection against harmful interference
when the product is operated in the intended operational
electromagnetic environment.
This product is intended for use in industrial locations. However,
harmful interference may occur in some installations, when the
product is connected to a peripheral device or test object, or if the
product is used in residential or commercial areas. To minimize
interference with radio and television reception and prevent
unacceptable performance degradation, install and use this
product in strict accordance with the instructions in the product
documentation.
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Furthermore, any changes or modifications to the product not
expressly approved by National Instruments could void your
authority to operate it under your local regulatory rules.
Caution To ensure the specified EMC performance,
operate this product only with shielded cables and
accessories.
Special Conditions for Marine Applications
Some products are Lloyd’s Register (LR) Type Approved for
marine (shipboard) applications. To verify Lloyd’s Register
certification for a product, visit ni.com/certification and search
for the LR certificate, or look for the Lloyd’s Register mark on
the product.
Caution In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
and cables to ensure that the desired EMC performance
is attained.
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NI 9467 Overview
The NI 9467 is a stationary GPS timing module for C Series
platforms. It provides accurate timing and geographic location
information to the C Series host, which enables synchronization
of C Series systems.
Start-Up Behavior
At start-up, the NI 9467 automatically begins determining its
location through a process known as self-survey. During the self-
survey, the module computes a location fix every second and
averages the locations at the end to obtain a more accurate
location. After the self-survey, the NI 9467 no longer computes
new location fixes; it uses its known location and satellite signals
to generate accurate timing signals.
Like all GPS receivers, the NI 9467 requires GPS satellite
ephemeris and almanac data to compute accurate time and
location. The ephemeris is detailed orbital information about each
satellite (where each satellite is expected to be at a given time).
The almanac data describes the general health of each satellite
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(for example, the receiver must not use signals from satellites
marked as unhealthy) and contains coarse orbit information. The
GPS satellites broadcast the ephemeris and almanac data every
30 seconds. Therefore, it usually takes approximately 30 seconds
for it to receive the ephemeris and almanac data and start
computing location and timing fixes.
Status LED
The NI 9467 has a front panel LED to indicate status. The
following table describes the meaning of each LED pattern.
Conditions LED State
Normal operation Solid green
Performing survey Blinking green
Not enough or no satellites Blinking yellow
Antenna error (no antenna or over-current) Solid yellow
Unconfigured Off
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Note Although the module may not detect the
presence of very low-power GPS antennas, it can still
function correctly. Note that the LED and software may
report antenna error under these conditions, and if the
current consumed is close to the detection threshold the
LED may flicker. Refer to the Specifications section for
more details.
Connecting the NI 9467
The NI 9467 has one SMA female connector on its front panel
for a GPS active antenna. The connector provides a DC voltage
to power the antenna and also serves as input for the GPS RF
signal.
Installing the Antenna
Caution National Instruments recommends using a
lightning arrester in line with the GPS antenna
installation to protect the NI 9467 and the C Series
system from possible damage and operators from injury
in the event of lightning.
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The embedded GPS receiver in the NI 9467 requires signals from
several satellites to compute accurate timing and location. The
more satellites available to the receiver, the more accurately it
can determine time and location. Therefore, the antenna location
should be such that it receives signals from the greatest number
of satellites possible. As the number of satellites visible to the
antenna decreases, the synchronization performance may also
decrease. Choose the antenna location so that the antenna has a
clear view of the sky. There is no strict definition for a clear view
of the sky, but a suitable guideline is that the GPS antenna should
have a straight line of sight to the sky in all directions (360°)
down to an imaginary line making a 30° angle with the ground.
Locations far from trees and tall buildings that could block or
reflect GPS satellite signals are best.
Maximum Cable Length
Maximum cable length depends on the GPS antenna gain and the
cable’s loss per unit of distance. National Instruments
recommends a GPS signal strength of between -135 dBm and
-120 dBm at the NI 9467 SMA input. GPS signal strength on the
Earth’s surface is typically -130 dBm. Targeting a signal strength
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of -125 dBm at the SMA input, you can compute the maximum
cable length as:
Max_cable_loss = -130 dBm + antenna_gain - (-125 dBm)
Max_cable_length = Max_cable_loss /
(loss_per_unit_of_distance)
For example, if you use an active antenna with gain of 28 dB and
RG-58 cable, which has a rated loss at 1.5 GHz of about
0.8 dB/m (24.5 dB/100 ft), the maximum cable length you could
use is:
Max_cable_loss = -130 dBm + 28 dB - (-125 dBm) = 23 dB
Max_cable_length = 23 dB / (0.8 dB/m) ≈ 29 m
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer
to the software help for information about enabling sleep mode.
Visit ni.com/info and enter cseriesdoc for information about
C Series documentation.
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Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
Notice that when the NI 9467 is in sleep mode, the GPS receiver
is not powered and stops tracking satellites. When the module
exits sleep mode and power to the GPS receiver is restored, the
module goes through the normal power-up process, which
includes the ephemeris/almanac data acquisition and self-survey
process. Therefore, it can take approximately 30 seconds before
usable timing and location signaling can be generated. Refer to
Start-Up Behavior for more information.
NI 9467 Specifications
The following specifications are typical for the range -40 °C to
70 °C unless otherwise noted.
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General Characteristics
Signal type L1 frequency; GPS C/A code
Datum WGS-84
RF GPS signal frequency 1575.42 MHz
Recommended signal
strength at SMA1
-135 dBm to -120 dBm
Max RF power at input 3 dBm
Input impedance 50 Ω, nominal
MTBF 2,234,702 h at 25 °C; Bellcore
Issue 2, Method 1, Case 3,
Limited Part Stress Method
PPS accuracy2±100 ns, > 99% typical
1Higher signal strength might saturate the receiver and degrade performance.
2For the best timing accuracy performance, ensure that the GPS antenna has a
clear view of the sky. Refer to the Antenna Installation section for more details.
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GPS Antenna Connector Characteristics
GPS antenna connector type SMA female
DC voltage output for
active antenna
+5 V ± 10%
Max. current output 30 mA
Minimum current for
antenna presence detection
6 mA typical, 9.5 mA max
Over-voltage protection ± 30 VDC
Power Requirements
Power consumption from chassis
Active mode 150 mA max
Sleep mode 1 mA
Thermal dissipation (at 70 °C)
Active mode 550 mW max
Sleep mode 5 mW
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Physical Characteristics
To clean the module, wipe it with a dry towel.
Weight 141 g (4.5 oz)
Environmental
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 85 °C
Ingress protection IP40
Operating humidity
(IEC 60068-2-78)
10% RH to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-78)
5% RH to 95% RH,
noncondensing
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Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
Random (IEC
60068-2-64)
5 grms, 10 Hz to 500 Hz
Sinusoidal (IEC
60068-2-6)
5 g, 10 Hz to 500 Hz
Operating shock (IEC
60068-2-27)
30 g, 11 ms half sine; 50 g, 3 ms
half sine;
18 shocks at 6 orientations
Safety and Hazardous Locations Standards
Note The NI 9467 module does not provide electrical
isolation.
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This product is designed to meet the requirements of the
following electrical equipment safety standards for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
• EN 60079-0:2012, EN 60079-15:2010
• IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
• UL 60079-0; Ed 5, UL 60079-15; Ed 3
• CSA 60079-0:2011, CSA 60079-15:2012
Note For UL and other safety certifications, refer to
the product label or the Online Product Certification
section.
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Hazardous Locations
U.S. (UL) Class I, Division 2, Groups A,
B, C, D, T4; Class I, Zone 2,
AEx nA IIC T4
Canada (C-UL) Class I, Division 2, Groups A,
B, C, D, T4; Class I, Zone 2, Ex
nA IIC T4
Europe (DEMKO) Ex nA IIC T4 Gc
Electromagnetic Compatibility
This product meets the requirements of the following EMC
standards for electrical equipment for measurement, control, and
laboratory use:
• EN 61326-1 (IEC 61326-1): Class A emissions; Industrial
immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
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Note In the United States (per FCC 47 CFR), Class A
equipment is intended for use in commercial, light-
industrial, and heavy-industrial locations. In Europe,
Canada, Australia and New Zealand (per CISPR 11)
Class A equipment is intended for use only in heavy-
industrial locations.
Note Group 1 equipment (per CISPR 11) is any
industrial, scientific, or medical equipment that does
not intentionally generate radio frequency energy for
the treatment of material or inspection/analysis
purposes.
Note For EMC declarations and certifications, and
additional information, refer to the Online Product
Certification section.
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CE Compliance
This product meets the essential requirements of applicable
European Directives, as follows:
• 2014/35/EU; Low-Voltage Directive (safety)
• 2014/30/EU; Electromagnetic Compatibility Directive
(EMC)
• 94/9/EC; Potentially Explosive Atmospheres (ATEX)
Online Product Certification
Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain product
certifications and the DoC for this product, visit ni.com/
certification, search by model number or product line, and click
the appropriate link in the Certification column.
Environmental Management
NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that
eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
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