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Novus NR300 Manual

Portable battery powered rubidium reference
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Portable Battery Powered Rubidium Reference
All information provided herein is the property of Novus Power Products
LLC. The information included may be reproduced without the permission of Novus
Power Products LLC for the purpose of operating the equipment.
Page #:
1 of 48
USERS MANUAL
REVISION
DATE
NR300
www.novuspower.com
NR300
D
8/16/21

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  • Page 1 Portable Battery Powered Rubidium Reference All information provided herein is the property of Novus Power Products LLC. The information included may be reproduced without the permission of Novus Power Products LLC for the purpose of operating the equipment. Page #: 1 of 48 www.novuspower.com...

  • Page 2: Table Of Contents

    GPS Lock Status and PPS ......................18 Rubidium Status – Lock State ...................... 19 Rubidium Status – Discipline State ..................... 20 Temperature ..........................21 NR300 Display and Menu Navigation ....................22 NEXT and SELECT Buttons, LCD Menus ....................22 GNSS Status ........................... 23 Frequency ............................24...
  • Page 3 USERS MANUAL NR300 REVISION DATE 8/16/21 Rubidium Status ..........................25 Battery Fuel Gauge ........................26 Battery Charger ..........................27 Onboard Sensors .......................... 28 User Settings ..........................29 Alerts .............................. 31 Accelerometer ..........................32 DB9 – RS232/RS485 ..........................33 USB Port (Mini B) ..........................34 USB Power ............................

  • Page 4: Overview

    10MHz sine outputs, IRIG-B, and PPS. Unit may also be used to capture timing events to within 1 usec. The NR300 is a portable time source for GNSS and GNSS denied environments with the following capabilities: ●...
  • Page 5 The event data can also be downloaded as a file to be manipulated off-line. Events are captured and stored to a resolution of 100 ns. Battery life is a function of configuration and use. The NR300, in its base configuration, can achieve well over five hours of battery life. The battery recharges in approximately six to eight hours.
  • Page 6 NR300 REVISION DATE 8/16/21 The NR300 case is an extruded aluminum case with impact protection. The timing platform is shock protected from the case with isolators. Critical elements in the design are located on a shock/vibration isolated subassembly. An active GNSS antenna is provided which is mounted to the top the unit (Antenna 2).
  • Page 7 USERS MANUAL NR300 REVISION DATE 8/16/21 Key Functional Elements Page #: 7 of 48 www.novuspower.com...

  • Page 8: Gnss Receiver

    USERS MANUAL NR300 REVISION DATE 8/16/21 GNSS Receiver The receiver and companion elements generate the GNSS sine wave, PPS and NMEA serial link. The serial link conforms to NMEA 0183 protocol. The GNSS receiver leverages 12,288 correlators in the baseband processor for low signal acquisition and tracking.
  • Page 9 USERS MANUAL NR300 REVISION DATE 8/16/21 When a third satellite is detected and a range determined, a third sphere intersects the area formed by the other two. This intersection occurs at just two points. A fourth satellite is then used to synchronize the receiver clock to the satellite clocks.

  • Page 10: Rubidium Clock

    USERS MANUAL NR300 REVISION DATE 8/16/21 Rubidium Clock The Rubidium reference employs a coherent trapping (CPT) technique to interrogate an atomic frequency. A laser illuminates atoms in a resonant cell with polarized radiation. The laser excitation significantly reduced Rb power consumption compared to a conventional Rb source plasma cell.

  • Page 11: Power

    The internal charger operates either from an external 5Vdc source (4.8 to 5.25Vdc) or a splash-proof charger that operates from 90 to 264Vac. The charger is housed within the unit. The NR300 is fully functional during charging with the PA0003 adapter. A full charge takes approximately six to eight hours.

  • Page 12: Operation

    ±0.5ppb/day, providing an ideal source for calibrating systems where a GPS signal is unavailable. After the NR300 has been used as a calibrator, the unit can be returned to an area where GNSS signal is available, and the GNSS can be restarted without disciplining the Rubidium.

  • Page 13: Gnss Lock

    USERS MANUAL NR300 REVISION DATE 8/16/21 GNSS Lock On power-up, the first menu “GNSS Status” provides information about the lock status of the GNSS receiver. The right side of the display provides UTC time and date indication, as well as a bar graph showing relative signal-to-noise (SNR) values for each satellite in the GPS and GLONASS satellite constellations.

  • Page 14: Rubidium Discipline

    Rubidium source. GNSS Lock (Reacquire) When the NR300 has completed its calibration duties, the unit can be returned to an area where GNSS signal is available and reacquire GNSS lock. To do this, press and hold the HOLDOVER button. The screen prompts for confirmation, then indicates that GNSS power up has been started.

  • Page 15: Functional Controls And Indicators

    USERS MANUAL NR300 REVISION DATE 8/16/21 Functional Controls and Indicators LED Indicators Power The “Power” LED indicator is illuminated green if the unit is active. If the unit is not active, the battery status indicators are still operational. Lock The “LOCK” indicator is a bi-color LED which provides a quick reference for the status of the GNSS lock.

  • Page 16: Ready

    The “Ready” indicator is illuminated if the GNSS has successfully completed discipline of the Rubidium oscillator. This happens when, after a period of time, the disciplined Rubidium reports “Discipline Good”. The “Ready” indicator illuminates, and the status banner shows “DGOOD”. The NR300 is now ready to enter HOLDOVER. Holdover Holdover is mode the unit needs to be in if the instrument is to be used in a GNSS denied environment.

  • Page 17: Battery

    REVISION DATE 8/16/21 mode. The NR300 provides holdover mode to save power when GNSS lock is not available. To enter holdover mode, the unit will have successfully achieved GNSS lock, completed Rb discipline, and the READY indicator illuminated. If the battery is below 15% capacity - a warning will be shown that you are going into holdover with a low battery.

  • Page 18: Status Banner/Notification Bar

    USERS MANUAL NR300 REVISION DATE 8/16/21 Status Banner/Notification Bar GPS Lock Status and PPS The status bar has a quick reference indicator for the GPS Lock and its PPS output. If the GPS is locked, the “GPS” indicator will remain on solid, without blinking.

  • Page 19: Rubidium Status - Lock State

    USERS MANUAL NR300 REVISION DATE 8/16/21 Rubidium Status – Lock State The status bar provides a snapshot of the current Rubidium status, and its relationship to the GNSS PPS input. The status bar will report both Discipline State and Lock State as reported by the Rubidium module.

  • Page 20: Rubidium Status - Discipline State

    GNSS PPS discipline. When the algorithm has sufficient averaging time from the available PPS, it indicates “DGOOD” for discipline good. At this point, the NR300 is ready to enter holdover mode. Prior to discipline good, the Rubidium indicates “DISCP”, which indicates a valid PPS signal is present, and tuning is in process.

  • Page 21: Temperature

    Temperature The NR300 has multiple internal temperature sensors. Included in the status bar is the indicator for general internal temperature. The units are C or F, selectable in the USER SETTINGS menu. During holdover, the temperature MIN/MAX values are updated to report total temperature variation and are shown on the ONBOARD SENSORS screen.

  • Page 22: Nr300 Display And Menu Navigation

    NEXT and SELECT Buttons, LCD Menus The LCD is used to provide detailed information regarding the status of the NR300. The NEXT and SELECT buttons are used for navigation of the LCD based menus and displays. Pressing the NEXT button will advance the display to the next screen or menu.

  • Page 23: Gnss Status

    USERS MANUAL NR300 REVISION DATE 8/16/21 GNSS Status Identifier Values Description GNSS module is active (On), or inactive (Off) to reduce GNSS ON/OFF power consumption GNSS has achieved lock, and provides reference PPS. If STAT LOCKED/UNLOCKED STAT is flashing “ACCY”, the current PPS is not accurate enough to discipline the Rb or measure frequency.

  • Page 24: Frequency

    USERS MANUAL NR300 REVISION DATE 8/16/21 Frequency Identifier Values Description Source frequency as measured relative to GNSS locked FREQUENCY PPS. If the GNSS is not locked, the value will not appear, and the flashing Rb holdover indicator will appear. Calculation of frequency error in ppb relative to the ERROR GNSS PPS.

  • Page 25: Rubidium Status

    USERS MANUAL NR300 REVISION DATE 8/16/21 Rubidium Status Identifier Values Description The Rubidium lock state as reported by the Rb STAT Lock State module. The Rubidium discipline state as reported by the Rb DISC Disc State module. ALRT Alert Alert condition (if any) as reported by the Rb module.

  • Page 26: Battery Fuel Gauge

    USERS MANUAL NR300 REVISION DATE 8/16/21 Battery Fuel Gauge Identifier Values Description VBAT Battery Voltage IBAT Current from battery (-) or charging battery (+) Percentage of available battery capacity TEMP °C or F Temperature as reported by Fuel Gauge RCAP...

  • Page 27: Battery Charger

    USERS MANUAL NR300 REVISION DATE 8/16/21 Battery Charger Identifier Values Description STAT Current Status register of battery charger circuit Current Fault register of battery charger circuit Status of charger PRE: Condition battery prior to fast charge Charge status FAST: Currently in Fast Charge Mode...

  • Page 28: Onboard Sensors

    USERS MANUAL NR300 REVISION DATE 8/16/21 Onboard Sensors Identifier Values Description VBAT Measured Battery voltage Measured +5V analog supply Measured -5V analog supply TMP1 °C or F Temperature sensor 1 TMP2 °C or F Temperature sensor 2 Vrms Output amplitude monitor channel 1...

  • Page 29: User Settings

    USERS MANUAL NR300 REVISION DATE 8/16/21 User Settings To select a field, highlight the field by using the SELECT button, then press AUX to toggle value. Identifier Values Description BEEP Off / On Enable / disable audible beep on button press.
  • Page 30 USERS MANUAL NR300 REVISION DATE 8/16/21 Selects AUX output source. IRIG is IRIG-B unmodulated source. PWM is the auxiliary frequency IRIG / AUX output that is assigned by the user via serial port. Choose frequency output with $AUXFR command. Selects DB9 serial connector I/O format. RS232 selects RS232 / RS485 RS232 on pins 2,3.

  • Page 31: Alerts

    USERS MANUAL NR300 REVISION DATE 8/16/21 Alerts The ALERTS screen provides any Alarm indicators that the NR300 has detected. To clear Alerts, press the AUXILIARY button. Error Description The valid holdover period has expired, and the unit should HLDOVR EXPIRED no longer be considered to be within specification.

  • Page 32: Accelerometer

    Current acceleration reading in Y coordinate (g) +/-n.nn Current acceleration reading in Z coordinate (g) When the NR300 is in an inverted position, an audible chirp is provided to alert the user that the unit needs to be flipped over while in use. Page #: 32 of 48 www.novuspower.com...

  • Page 33: Db9 - Rs232/Rs485

    USERS MANUAL NR300 REVISION DATE 8/16/21 DB9 – RS232/RS485 Function Optional PPS NMEA port / Command Port TX NMEA Port / Command Port RX RS485 (A) RS485 (B) The RS485 outputs are internally terminated in the following manner, with Vdd typically 5V.

  • Page 34: Usb Port (Mini B)

    USB Power A standard USB interface is not adequate to power the NR300, and therefore the NR300 will not draw in excess of 500mA when connected via the USB port. However, if the battery is depleted and the unit is not running, charging can take place via USB at 500mA charge.

  • Page 35: Frequency Reference Output

    USERS MANUAL NR300 REVISION DATE 8/16/21 Frequency Reference Output Standard is a 10 MHz sine wave output that is locked to the atomic clock. It is a low noise 50 Ohm output (0.5 volts rms). There is an auxiliary port to support optional frequency outputs and other features.

  • Page 36: Irig-B Output

    USERS MANUAL NR300 REVISION DATE 8/16/21 IRIG-B Output The unit features two ports for GPS locked IRIG-B output on BNC connections. One port is IRIG-B-0xx (DCLS), and one port is IRIG-B-1xx (Sine). The default setting of both IRIG-B ports is IEEE 1344 with straight binary seconds (SBS).

  • Page 37: Aux

    3.3Vdc CMOS. Event is a rising/falling edge, as determined by edge direction command. PWM Frequency Output - the NR300 has the capability of generating a variety of frequencies, programmable by $AUXFR command. IRIG-B Unmodulated - Provides an unmodulated pulse output that conforms to the IEEE 1344 standard.

  • Page 38: Quick Start Guide

    USERS MANUAL NR300 REVISION DATE 8/16/21 Quick Start Guide Page #: 38 of 48 www.novuspower.com...
  • Page 39 USERS MANUAL NR300 REVISION DATE 8/16/21 Page #: 39 of 48 www.novuspower.com...

  • Page 40: Programming Guide (Rs232 Port)

    DATE 8/16/21 Programming Guide (RS232 Port) The NR300 can accept user commands which will provide specific status and performance feedback, and which may be customized by the user. Many of the settings can be saved in non-volatile flash memory. Commands that are handled by the GNSS receiver are passed through to the GNSS, and the responses returned.
  • Page 41 USERS MANUAL NR300 REVISION DATE 8/16/21 Setting Command Response Description Query NVS<n> String. Useful for status output $STAT<n> on demand when user does not require regular <$GPNVS,1….> string output. STATUS OUTPUT $STAT1 Outputs current $GPNVS,1 string on demand. $STAT2 <$GPNVS,2….>...
  • Page 42 USERS MANUAL NR300 REVISION DATE 8/16/21 Same function as $NVS but uses format of GPS Appendix A. Must include checksum. $GPNVS $PERDCFG,NMEAOUT Example: $PERDCFG,NMEAOUT,NVS,9,1*4B sets $GPNVS,9 to output at a 1 second frequency. For format usage, see Appendix A. Sets the auxiliary frequency output. Even...

  • Page 43: Accessories

    USERS MANUAL NR300 REVISION DATE 8/16/21 Accessories Antenna Included with the device is a GNSS antenna on a 3-meter cable. It includes a 28 dB LNA to assure GNSS acquisition even in weak signal environments. The antenna LNA is powered over the antenna cable with 3.3Vdc. The power level is limited to 45 mA.

  • Page 44: Power

    USERS MANUAL NR300 REVISION DATE 8/16/21 Power External power is provided by the included power adapter which can operate from 90 to 264Vac 50/60 Hz. (3 Amps, 5Vdc). When connected to an external power source, the charger will activate if the battery requires charging. A full charge cycle is about six hours.

  • Page 45: Technical Specifications

    USERS MANUAL NR300 REVISION DATE 8/16/21 Technical Specifications Output (3) 10 MHz,0.5 Vrms (optional 1Vrms) ±0.2, into 50 Ohms BNC (sine or square) Rubidium Warm-up time <15 minutes Time of lock <5 minutes -130 dBm Time to achieve accuracy <2E-9<15 minutes, (12 minutes)
  • Page 46 Hot Start: - 157 dBm Warm Start: - 143 dBm Cold Start: - 143 dBm Reacquisition: - 157 dBm With Novus recommended antenna Antenna with LNA Internal patch antenna or external antenna with LNA Antenna power 3.5 Vdc, < 35 mA (on center conductor)

  • Page 47: Limited Hardware Warranty

    Should Novus be unable to repair or replace the product within a reasonable amount of time, the customer’s alternate remedy shall be a refund of the purchase price upon return of the product to Novus. The liability of NOVUS under this warranty is limited to replacing, repairing or issuing a credit, at its option, for any such item returned by Buyer under the terms of this warranty.
  • Page 48 PROFITS, BUSINESS INTERRUPTION, LOSS OF DATA OR BUSINESS INFORMATION (OR OTHER PECUNIARY LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE THE HARDWARE SUPPLIED THEREWITH EVEN IF NOVUS OR ANYONE ELSE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.

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