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Summary of Contents for Meinberg TCR51USB
- Page 1 Technical Information Operating Instruction TCR51USB...
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Page 2: Contact Information
Contact Information Meinberg Funkuhren GmbH & Co. KG Lange Wand 9 D-31812 Bad Pyrmont Telefon: ++49 (0) 52 81 / 9309-0 Telefax: ++49 (0) 52 81 / 9309-30 Internet: http://www.meinberg.de Email: info@meinberg.de Juli 12, 2011... -
Page 3: Table Of Contents
Table of Contents Contact Information ................2 Content of the USB stick ..............4 Introduction ..................5 Description of IRIG-Codes ..............5 IRIG-Standard format ................6 AFNOR-Standard format ..............7 Features TCR51USB ................8 Functional description ..............9 USB Interface ..................10 Connectors and LEDs ............... -
Page 4: Content Of The Usb Stick
If the present delivered stick doesn’t include a driver program for the operating system used, it can be downloaded from: http://www.meinberg.de/english/sw/ On the USB stick there is a file called „readme.txt“, which helps installing the driver... -
Page 5: Introduction
Introduction The transmission of coded timing signals began to take on widespread importance in the early 1950´s. Especially the US missile and space programs were the forces behind the development of these time codes, which were used for the correlation of data. The definition of time code formats was completely arbitrary and left to the individual ideas of each design engineer. -
Page 6: Irig-Standard Format
IRIG-Standard format... -
Page 7: Afnor-Standard Format
AFNOR-Standard format... -
Page 8: Features Tcr51Usb
Features TCR51USB The TCR51USB was developed for computer systems with USB connection. TCR51USB serves to receive and decode modulated (AM) and unmodulated (DC Level Shift) IRIG and AFNOR time codes. AM-codes are transmitted by modulating the amplitude of a sine wave carrier, unmodulated codes by variation of the width of pulses. Automatic gain control within the receive circuit for modulated codes allows decoding of IRIG signals with a carrier amplitude of 600 mVpp to 8 Vpp. -
Page 9: Functional Description
The internal system clock is always set to the received IRIG time, which might have a local offset to UTC. Only if TCR51USB is configured with this offset, Meinberg driver software is able to set the system time of the computer correctly. -
Page 10: Usb Interface
USB Interface The TCR51USB contains a USB interface which is used for the communication and parameterization of the device with the Monitorprogramm. Connectors and LEDs The housing of the TCR51USB contains the connectors for the Timecode (IRIG AM/ DC), two LED‘s, the key for the Bootstrap-Loader as soon as the the USB connector. The LEDs signal the status of the IRIG receiver. -
Page 11: Buffering
Buffering If the power supply fails, an onboard realtime clock automatic switching to crystal time base. In this case the power requirement of this clock has been taken over by an internal capacitor which was load by the USB Powersupply. This enables a independent Voltagesupply for the internal realtime clock of ca. -
Page 12: Input Impedance
Input impedance The IRIG-specification doesn’t define values for the output impedance of generators or the input impedance of receivers. This fact led to incompatibility of some modules, because the manufacturers could choose the impedances freely. For example: if the output impedance of the generator is high and the input impedance of the receiver low, the signal level at the receiver input might be too low for correct decoding. -
Page 13: Firmware Updates
Firmware Updates Whenever the on-board software must be upgraded or modified, the new firmware can be downloaded to the internal flash memory via the USB connection. If the button behind a hole in the housing is pressed during the power up, a bootstrap loader is activated and waits for instructions from the USB. -
Page 14: Ce Label
+/-5 µsec compared to IRIG reference marker ACCURACY OF TIME BASE: REQUIRED ACCURACY OF TIME CODE SOURCE: +/- 100ppm HOLDOVER MODE: automatic switching to crystal time base accuracy approximately 1E-6 if decoder has been synchronous for more than 1h BACKUP-BATTERY: if the power supply fails, an onboard realtime clock keeps time and date information. - Page 15 TCR5 1 USB - E- 1 2 . 0 7 . 1 1...
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