Datum 6504 IRIG-B User manual

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Operating Manual
6504 IRIG-B Distribution
6504 IRIG-B Distribution
Excerpted from 
Document # 
14508-201 Rev A

Copyright Notice
6504
COPYRIGHT 2001 DATUM - TT&M ALL RIGHTS RESERVED
This manual is provided to assist the user in the operation and maintenance of the supplied equipment
or software. It is recognized that multiple copies may be required to support even a single unit, and
for this reason, permission is hereby granted to reproduce the supplied User’s Guide for the purpose
stated above, provided that this notice is included as part of the copy. Additional copies are also
available from Datum - TT&M for a nominal fee.
In no case, however, does the supply of this manual or the granting of rights to reproduce the manual,
grant any rights to use information contained within to reproduce the supplied equipment or software,
either in whole or in part.
The equipment or software described in this manual have been developed solely at the expense of
Datum - TT&M and are proprietary. No unlimited rights in technical data are granted. Limited rights
as per DFARS 252.227-7013 shall be effective for 10 years from the copyright date.

6504 IRIG-B Distribution
TABLE OF CONTENTS
CHAPTER ONE
Introduction/Product Overview 3
CHAPTER TWO
Installation 7
CHAPTER THREE
Operation 10
CHAPTER FOUR
Specifications 12

Chapter One
6504
INTRODUCTION/PRODUCT OVERVIEW
This Operating Manual contains procedures and descriptive information for proper installation and
operation of the Datum 6504 IRIG-B Distribution module.
NOTE …
The 6504 is built in one of two chassis configurations: 6504A or 6504B. The 6504A is the
original chassis design, which is superceded by the 6504B chassis. They are functionally
identical in every way except for the ALARM OVERRIDE switch, which appears on the
front panel of the 6504A. This switch is optional for the 6504B, and is located on the rear
panel when it is furnished.
The Datum 6504 IRIG-B Distribution module accepts a single IRIG-B timing signal and provides ten
buffered IRIG-B timing signal outputs.
OPERATING MANUAL SUMMARY
This Operating Manual is divided into the following chapters:
A. CHAPTER ONE – INTRODUCTION/PRODUCT OVERVIEW
This chapter includes a general description of the Datum 6504 and provides some
basic product information.
B. CHAPTER TWO – INSTALLATION
Provides initial inspection and installation information.
C. CHAPTER THREE - OPERATION
Provides information on the use of the switches and indicators.
D. CHAPTER FOUR – SPECIFICATIONS
Provides detailed specifications for the Datum 6504.
3

6504
PURPOSE OF EQUIPMENT
The Datum 6504 IRIG-B Distribution module uses Datum’s high performance distribution technology
created for its line of cesium standards. The 1U (1.75" high) chassis houses a set of very low noise
and high isolation RF amplifiers. Up to ten Datum 6504 RF Distribution modules may be daisy chained
to provide up to 100 independently buffered outputs of the common input. The level of the input signal
and all ten output signals are monitored, providing a visual indicator of signal presence as well as a
summary fault (form-C relay) for each module.
A complete list of performance characteristics is provided in Chapter Four.
INSTRUMENT IDENTIFICATION
The model number 6504 may be followed by a slash (/) and a three-digit number to indicate an option
that is supplied within the instrument.
PREPARATION FOR SHIPMENT
To turn off the Datum 6504 prior to shipment, remove the AC power from the plug on the rear panel.
Package the instrument in its original packing if possible. If the original packing materials are not
available, pack in a reinforced cardboard carton using foam to take up any space inside the carton.
Do not use foam popcorn or crushed paper for packing.
If the instrument is being returned to Datum, contact the Service Department at 1-800-938-9888 for
product return information.
TYPOGRAPHICAL AND OTHER CONVENTIONS
This Operating Manual uses the following conventions:
Acronyms and Abbreviations – Terms are spelled out the first time they appear in this
Operating Manual. Thereafter, only the acronym or abbreviation is used. In addition, the glossary
defines the acronyms and abbreviations.
Revision Control – The title page lists the printing date and part number of this Operating Manual.
Table 1-1 describes the typographical conventions that this Operating Manual uses to
distinguish between the different types of information according to how they are used.
4

TABLE 1-1. TYPOGRAPHICAL CONVENTIONS
WARNINGS, CAUTIONS, RECOMMENDATIONS, AND NOTES
Warnings, Cautions, Recommendations, and Notes attract attention to essential or critical information
in this Operating Manual. The types of information included in each are explained as follows:
WARNING …
All warnings have this symbol. Do not disregard warnings. They are installation,
operation, or maintenance procedures, practices, or statements that if not strictly
observed, may result in personal injury or loss of life.
ELECTRICAL SHOCK HAZARD …
All electrical shock hazard warnings have this symbol. To avoid serious personal injury
or death, do not disregard electrical shock hazard warnings. They are installation,
operation, or maintenance procedures, practices, or statements that if not strictly
observed, may result in personal injury or loss of life.
CAUTION …
All cautions have this symbol. Do not disregard cautions. They are installation, operation,
or maintenance procedures, practices, conditions, or statements that if not strictly
observed, may result in damage to or destruction of equipment or may cause a long-term
health hazard.
WHEN TEXT APPEARS THIS WAY ... IT MEANS ...
Datum 6504 Operating Manual The title of a document or the name of a product
CRITICAL PORT-1 J1 An operating mode, alarm state, status, or chasis label.
Press the Enter key. A named keyboard key. The key name is shown as it
appears on the keyboard. An explanation of the key’s
Press the Print Scrn key. acronym or function immediately follows the first
reference to the key, if required.
A re-timing application ... A term or a word being emphasized.
Datum does not recommend ... A word or term given special emphasis so that you do not
miss the idea being presented.
6504
5

6504
CAUTION …
All Electrostatic Discharge (ESD) cautions have this symbol. They are installation,
operation, or maintenance procedures, practices, conditions, or statements that if not
strictly observed, may result in electrostatic discharge damage to, or destruction of,
static sensitive components of the equipment.
RECOMMENDATION …
All recommendations have this symbol. Recommendations indicate manufacturer-tested
methods or known functionality. They contain installation, operation, or maintenance
procedures, practices, conditions, or statements that provide you with important
information for optimum performance results.
NOTE …
All notes have this symbol. Notes contain installation, operation, or maintenance
procedures, practices, conditions, or statements that alert you to important information
which may make your task easier or increase your understanding.
WHERE TO FIND ANSWERS TO PRODUCT AND DOCUMENT QUESTIONS
If you believe that this product is not performing as expected, or if you have comments about
this Operating Manual, please contact your Datum representative or sales office
We appreciate your suggestions on ways to improve this Operating Manual. Please mark or write
your suggestions on a copy of the page and mail or fax it to …
Datum – Timing, Test & Measurement
34 Tozer Road
Beverly, MA 01915-5510
US Toll Free: 1-800-544-0233
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Thank you for providing the information.
NOTE …
Datum offers a number of applicable training courses designed to enhance product
usability. Contact your Datum representative or sales office for a complete list of
courses and outlines.
6

Chapter Two
6504
INSTALLATION
MOUNTING
The Datum 6504 is designed to be mounted in a standard 19-inch equipment rack and take up 1 U of
vertical space (1.75"). The chassis depth is 10 inches.
POWER CONNECTION/FUSES/VOLTAGE SELECTION
The Datum 6504 is powered from an AC source by a detachable power supply cord. The power cord
is the disconnect device. Refer to Chapter Four for power supply requirements. The AC fuses are
located inside the AC connector/filter. The hot and neutral lines are fused separately. To change
fuses, refer to Figure 2-1. Open the cover on the AC connector/filter by applying a screwdriver to the
cover slot. Once the cover is open, each fuse holder may be removed for inspection or replacement.
Replace only with a 0.2A, 250V fuse as specified in Chapter Four.
FIGURE 2-1. AC INPUT FILTER/FUSES/VOLTAGE SELECTOR
The Datum 6504 may be powered from 120 or 240 VAC. To change the AC input between 120 and 240 VAC,
refer to Figure 2-1. Open the cover on the AC input connector by applying a screwdriver to the cover slot.
Once the cover is open, a selector switch may be rolled left or right to line up "120" or "240" with the small
window in the connector cover. Replace the cover on the AC input connector by snapping in place.
7

6504
CAUTION …
Do not use the voltages labeled "100" or "230", as they are not connected.
DC POWER CONNECTION
The Datum 6504 (DC version) is powered from a DC source. The connections are made at TB1 as
shown in Figure 2-2. The voltage input may be 20 V to 75 V.
FIGURE 2-2. DC POWER CONNECTION
SIGNAL CONNECTIONS
Connect the signal to be distributed to one of the two D connectors labeled INPUT. Set the impedance
switch to 50Ω(down) if only one 6504 module is to be used. If multiple 6504 modules are used to
obtain more than twelve outputs, see Figure 2-4.
Output cables may be connected in any order to the D connectors labeled 1 to 12. Refer to Figure 2-3.
FIGURE 2-3. SIGNAL CONNECTIONS
With the 6504 powered, the green power indicator on the front panel will illuminate. The impedance
switch should be set to 50Ωif there is only one module. The red indicator next to the input signal is off
to show that there is a good input signal.
DAISY-CHAINING MORE THAN ONE MODULE
If more than ten outputs are required, up to ten Datum 6504 modules can be driven by a common input
signal to produce up to 100 outputs. Figure 2-4 illustrates this connection.
8

6504
FIGURE 2-4. DAISY-CHAINING MULTIPLE MODULES
The example in Figure 2-4 shows three units. The original signal from the source is connected to the
top IN connector on the right side of the first module. The lower IN connector on the first module is
connected to the top IN connector on the second module. The second module is connected to the
third module in the same fashion. The impedance switch for the first and second chassis is set to HI Z,
while the impedance switch on the third (or last) chassis in the daisy chain is set to 50Ω.
ALARM CONNECTIONS
The Datum 6504 provides for an alarm to signal the failure of any signal output. One set of form-C
relay contacts is provided on the 9-pin D connector labeled ALARMS. For normal operation, pins 1 to
2 are open and pins 1 to 3 are closed. The sense is reversed for a fault condition. Refer to Figure 2-5.
FIGURE 2-5. ALARM CONTACTS
If the input signal or input buffer fails or falls below the factory-set low-level threshold, the red fault
indicator next to the input connector will turn on. Likewise, if any output buffer fails or falls below the
low-level threshold, a red fault indicator next to that output will turn on. The ALARM form-C relay is
normally energized, indicating no signal failure. If either the input or any output signal fails, the relay is
deenergized (short between pins 1 and 2), indicating a fault condition. This is a failsafe design that
will indicate a fault in the event of a power loss.
9

Chapter Three
6504
OPERATION
The Datum 6504 IRIG-B Distribution controls and indicators are described in this chapter. Two chassis
configurations are described, the 6504A and the 6504B. The only difference between the two chassis
configurations is that the ALARM OVERRIDE switch is optional for the 6504B, and when it is furnished
with the 6504B it is located on the rear panel.
FIGURE 3-1A. 6504A RF DISTRIBUTION FRONT PANEL
FIGURE 3-2A. 6504A RF DISTRIBUTION REAR PANEL
FIGURE 3-1B. 6504B RF DISTRIBUTION FRONT PANEL
FIGURE 3-2B. 6504B RF DISTRIBUTION REAR PANEL
10

6504
HI Z/50Ω– This slide switch on the rear panel selects either the HI Z input impedance (unterminat-
ed) or the 50Ωinput impedance. A 6504 installation of two or more (ten maximum) units will require
the switch to be set to the HI Z position on the module connected to the source of the signal, and on
all subsequent modules except the last module, which is switched to the 50Ωposition, providing prop-
er termination for the signal.
ALARM OVERRIDE – This toggle switch on the front panel of the 6504A enables or disables the
ALARM relay, which is output via the ALARM connector on the rear panel. When the switch is in the
UP position, the ALARM relay is enabled, and will switch states in the event of a signal failure. Placing
the switch in the down position will force the ALARM relay to the normal (no alarm) condition. The
purpose of this switch is to allow an audible alarm to be shut off. This switch does not affect any of
the LED indications.
An optional ALARM OVERRIDE switch may be ordered with the 6504B configuration. The optional tog-
gle switch will be located on the rear panel above the "IN" connectors.
POWER – LED on the front panel to indicate that power is applied. There is no power switch on the
6504. When power is connected, power is ON.
ALARM – LED on the front panel to indicate that an ALARM condition exists. An alarm condition
exists when the input signal or any output signal fails or falls below the factory preset amplitude.
INPUT FAULT – LED located on the rear panel between the two INPUT connectors. If the input
signal fails or falls below the factory preset amplitude, this LED will light and stay on until the cause of
the fault is remedied.
OUTPUT FAULT – LED’s, located to the right of each output connector. If any output signal fails
or falls below the factory preset amplitude, the LED associated with the failed output will light and stay
on until the cause of the fault is remedied.
11

Chapter Four
6504
SPECIFICATIONS
NOTE …
All performance is at an ambient temperature of 25°C unless otherwise specified.
TIME CODE OUTPUTS (10)
Code Format IRIG-B (DCLS Form)
Modulation Frequency 1 kHz
Modulation Ratio 3:1
Amplitude ≤3 V P-P
TIME CODE INPUT
Code Format IRIG-B (DCLS Form)
Modulation Frequency 1 kHz
Modulation Ration 3:1
Amplitude ≤3 V P-P
POWER
Operating Voltage 120/230 VAC, ±15%, <10 W
DC Input (Optional) 22 to 56 VDC, 10 W
MECHANICAL
Height 1.75" (1 U)
Width 19" (including rack mount ears)
Depth 10"
Weight < 10 lbs
ENVIRONMENT
Operating Temperature 0 to 55°C
Relative Humidity 0 to 95%, non-condensing
12

6504
CONTROLS AND INDICATORS
POWER Green LED indicates power is connected
ALARM Red LED indicates a signal output failure
ALARM OVERRIDE Toggle switch: UP = Alarm Enabled
(Optional for 6504B) DOWN = Alarm Disabled
NOTE …
If the input signal level is less than 10 dBm, please specify the Low Alarm
Threshold version (-509).
13

Limited Warranty
Appendix
DATUM - TT&M guarantees its products to be free from defects in material and workmanship for a
period of one year from the date of shipment. Datum - TT&M shall, at its option, either repair or
replace hardware products which prove to be defective.
DATUM - TT&M software and firmware products designed to be used and installed in Datum -
TT&M hardware products are warranted not to fail to execute their programming instructions due to
defects in material or workmanship. If Datum - TT&M receives notice of such defects during the war-
ranty period, Datum - TT&M will repair or replace software media and firmware which do not execute
their programming instructions due to such defects. Datum - TT&M does not warrant that operation of
the software, firmware or hardware shall be uninterrupted or error free.
All warranty service will be carried out at the Datum - TT&M – TT&M facilities at 34 Tozer Rd,
Beverly, MA 01915. The purchaser shall prepay shipping charges and shall pay all duties and taxes for
products returned for warranty service. Datum - TT&M will pay for the return of products to the
purchaser except for products returned from another country.
LIMITATION OF WARRANTY: The above warranty does not apply to defects of, or
resulting from the following:
1. End items included as part of a system or product selected by, but not designed by,
Datum - TT&M are subject only to warranty as may be obtained from the original
manufacturers. Such items include, but are not limited to, test equipment,
accessories, batteries, computers, printers, software, etc.
2. Items manufactured by Datum - TT&M pursuant to detailed designs furnished by
purchaser or specific components, accessories, support equipment and software
specified by purshaser.
3. Improper or inadequate maintenance by purchaser.
4. Unauthorized modifications, misuse or mishandling.
5. Operation outside of the environmental specifications of the product.
6. Purchaser’s supplied software or interfacing.
THIS WARRANTY IS EXCLUSIVE AND NO OTHER WARRANTY, WHETHER WRITTEN OR ORAL, IS
EXPRESSED OR IMPLIED. DATUM - TT&M SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedies set forth above are the purchaser’s sole and exclusive remedies. In no circumstances
shall Datum - TT&M assume liability for loss, damage, or consequential expense (including loss of
profits) whether based on contract, tort, or any other legal theory, arising directly or indirectly from the
use of its equipment separately or in combination with other equipment.

Artisan Technology Group is your source for quality
new and certied-used/pre-owned equipment
• FAST SHIPPING AND
DELIVERY
• TENS OF THOUSANDS OF
IN-STOCK ITEMS
• EQUIPMENT DEMOS
• HUNDREDS OF
MANUFACTURERS
SUPPORTED
• LEASING/MONTHLY
RENTALS
• ITAR CERTIFIED
SECURE ASSET SOLUTIONS
SERVICE CENTER REPAIRS
Experienced engineers and technicians on staff
at our full-service, in-house repair center
WE BUY USED EQUIPMENT
Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins
www.artisantg.com/WeBuyEquipment
REMOTE INSPECTION
Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com
LOOKING FOR MORE INFORMATION?
Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical
specications, manuals, and documentation
Contact us: (888) 88-SOURCE | [e-mail] | www.artisantg.com
SM
View
Instra