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SDI CS-1 Operating Manual

9.192 ghz cesium frequency synthesizer
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SDI
S
D
I
PECTRA
YNAMICS,
NC.
9.192 GH
C
F
S
Z
ESIUM
REQUENCY
YNTHESIZER
CS-1
O
M
PERATING
ANUAL
S
D
I
PECTRA
YNAMICS,
NC • 1849 Cherry St. Unit 2 • Louisville, CO 80027
Phone: (303) 665-1852 • Fax: (303) 604-6088
www.spectradynamics.com

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  • Page 1 PECTRA YNAMICS, 9.192 GH ESIUM REQUENCY YNTHESIZER CS-1 PERATING ANUAL PECTRA YNAMICS, NC • 1849 Cherry St. Unit 2 • Louisville, CO 80027 Phone: (303) 665-1852 • Fax: (303) 604-6088 www.spectradynamics.com...

  • Page 2: Table Of Contents

    Description……………………………………………………………….………. 2 Safety and Preparation for Use………………………………………………… 3 DC Module...…………………………………………………………………….. 4 Synthesizer Module: Front Panel……………………………………………… 5 Synthesizer Module: Rear Panel………………………………………………. 7 CS-1 Synthesizer Module Specifications……..………………….…………. RS-232 Port……………………………………………………………………..9 Basic Operation….…………………………………………………………..…. 10 Menu Diagram….…………………………………………………………..…… 13 Main Screen.…………………………………………………………………..15 Number Entry Screen…………………………………………………………… 16 Frequency Screen..…………………………………………………………..

  • Page 4: Description

    Description The 9.192 GHz Synthesizer CS-1 is made up of two separate units: the Synthesizer Module and the DC Module. The Synthesizer Module is a high stability and high resolution signal source designed to be used in the implementation of a Cesium atomic clock. The unit is provided in a 2U, 19 inch rack-mount enclosure.

  • Page 5: Safety And Preparation For Use

    Operation To operate the CS-1 unit, locate the AC power entry connector on the rear panel of the CS-1 DC Module and connect the AC power cable. When power is applied to the CS-1 DC Module, LEDs located on the front panel, labeled “ON”, should light up.

  • Page 6: Dc Module

    5V, 12V, 15V, 24V The LEDs are on when power is applied to the unit and the unit is operating properly. REAR PANEL AC POWER ENTRY MODULE The CS-1 DC Module is configured to operate on:  100-120 VAC ...

  • Page 7: Synthesizer Module: Front Panel

    RS-232 DB-9 connector for serial communications. This is a dumb terminal RS-232 port. A null modem adapter is not required. DISPLAY The LCD display and touch screen is used to control the CS-1 in local control mode. REFERENCE INPUTS Signal The Signal LED will turn on when the external reference is present at the Ext Ref port.
  • Page 8 Synthesizer Module: Front Panel OUTPUTS 5 MHz SMA output providing a buffered copy of the 5 MHz reference signal. This output signal has a level of +15 dBm ± 1 dB. 10 MHz SMA output providing a buffered copy of the 5 MHz reference signal multiplied by 2.

  • Page 9: Synthesizer Module: Rear Panel

    Synthesizer Module: Rear Panel DC INPUT Connectors for the DC power provided to the Synthesizer Module by the DC Module. STANDBY Standby Switch turns off the synthesizer but keeps all oscillators powered Copyright © SpectraDynamics, Inc. 2010...

  • Page 10: Cs-1 Synthesizer Module Specifications

    CS-1 Synthesizer Module Specifications PARAMETER CONDITIONS UNITS Averaging time 1·10 Frequency Stability 10 s 1·10 100 s Ref. 5 MHz, +13 dBm 1·10 1000 s Pair measurement 2·10 100000 s 2·10 1000000 s 2·10 Offset frequency Phase Noise L(f) *...

  • Page 11: Rs-232 Port

    RS-232 Port RS-232 Communication Port The CS-1 Synthesizer Module functions are accessed through the RS-232 port located on the front panel. A standard serial cable with a DB-9 connector can be used to interface to the unit. The user can input commands using a simple dumb terminal program on a remote computer or more sophisticated control can be used with software such as Labview.
  • Page 12 Press the soft key EXIT three times to return to the Main Menu. It is possible to use CS-1 in its Internal Reference configuration. To do so, go to the PLL Menu and select INT. The Ext Ref port is then routed to the tuning port of the internal low-noise 5 MHz reference crystal, which is now the main reference for the synthesizer.
  • Page 13 Basic Operation Output Upon power up, the internal relay at the 9.192 GHz output port is in the OFF position and the RF ON LED is turned off. To turn the RF output on, press the soft key RFOFF in the Main Screen. When the RF is turned on, the signal level at the 9.192 GHz port is 0 dBm with a preset frequency of 9.192631770 GHz.

  • Page 14: Basic Operation

    The Trigger Menu offers the possibility of synchronizing the modulation events with an external trigger provided at the Trigger In Port, setting the CS-1 to operate as a state machine. The operation as a state machine includes up to 10 states, each one incremented on every rising edge of the hardware trigger.

  • Page 15: Menu Diagram

    Menu Diagram Copyright © SpectraDynamics, Inc. 2010...
  • Page 16 Menu Diagram Copyright © SpectraDynamics, Inc. 2010...

  • Page 17: Main Screen

    Main Screen Main Screen The main screen displays the current frequency and phase and amplitude of the CS-1 Synthesizer. The soft keys at the bottom of the screen display the five main functions that are available. DISPLAYS Frequency Frequency of the 9.1926xx GHz output carrier expressed in Hz.

  • Page 18: Number Entry Screen

    Number Entry Screen Number Screen The number entry screen is used to make numeric entries. DISPLAYS The current setting will be displayed across the top of the screen. The new entry is displayed in a number entry box. SPECIAL KEYS Enter number in Hertz.

  • Page 19: Frequency Screen

    Frequency Screen Frequency Screen The frequency screen allows the changing of the 9.192 GHz carrier frequency using the soft keys at the bottom of the screen as described below. DISPLAYS Frequency Current frequency of the 9.1926xx GHz output carrier expressed in MENU Allows entering the new carrier frequency using the Frequency Entry Menu.

  • Page 20: Phase Screen

    Phase Screen Phase Screen The phase screen allows the changing of the 9.192 GHz carrier phase using the soft keys at the bottom of the screen as described below. DISPLAYS Phase Current phase added to the 9.1926xx GHz output carrier, expressed in degrees (deg).

  • Page 21: Amplitude Screen

    Amplitude Screen Amplitude Screen The amplitude screen allows the changing of the 9.1926xx GHz signal amplitude using the soft keys at the bottom of the screen as described below. DISPLAYS Amplitude Current amplitude of the 9.1926xx GHz output carrier, expressed in dBm.

  • Page 22: Settings Screen

    Settings Screen Settings Screen The settings screen is used to access, view and edit instrument options. MENU Setup Modulation options. Setup Frequency Modulation. Setup Phase Modulation. Setup Amplitude Modulation. State Machine Trigger setup and information. The STM key will bring up the State Machine Trigger Screen. INST Instrument setup and information.

  • Page 23: Modulation Screen

    Modulation Screen Modulation Screen The modulation screen allows setting of the modulation parameters using the soft keys described below, according to the possibilities described in Basic Operation section. MENU allows two options for the frequency modulation (FM) of the 9.1926xx GHz output signal: a Frequency Sweep and Frequency Shift Keying (FSK) modulation.

  • Page 24: Frequency Sweep Screen

    Frequency Sweep Screen FSWP Screen The frequency sweep screen allows setting of the parameters of the linear frequency modulation. When FSWP is enabled a * character will appear before the frequency display in the Main Screen. DISPLAYS Sweep start frequency in Hz. Sweep stop frequency in Hz.
  • Page 25 Frequency Sweep Screen MENU Allows entering the frequency sweep parameters. Each one of the soft keys described below will bring up the Frequency Entry Menu, to enter the numeric quantities, expressing them in Hz, kHz or MHz. Sweep start frequency in Hz. Valid range of values is from 9.189631770 GHz to 9.195631770 GHz (±3 MHz with respect to the preset value).

  • Page 26: Frequency Shift Keying Screen

    Frequency Shift Keying Screen FSK Screen The frequency shift keying screen is used to access, view and edit frequency shift keying modulation options. When FSK is enabled a * character will appear before the frequency display in the Main Screen. DISPLAYS First frequency setting in Hz.

  • Page 27: Phase Modulation Screen

    Phase Modulation Screen PM Screen The phase modulation screen is used to access, view and edit phase shift keying modulation options. When PM is enabled a * character will appear before the phase display in the Main Screen. DISPLAYS Phase 1 First phase setting in degrees.

  • Page 28: Amplitude Modulation Screen

    Amplitude Modulation Screen AM Screen The amplitude modulation screen is used to access, view and edit amplitude shift keying modulation options. When AM is enabled a * character will appear before the phase display in the Main Screen. DISPLAYS RTIM The ramp time, the time in microseconds that it takes for the output amplitude to go from off to on.

  • Page 29: State Machine Trigger Screen

    The state machine trigger screen allows synchronization of the modulation events with an externally provided hardware trigger (see Synthesizer Module Font Panel), setting the CS-1 to operate as a state machine. operation as a state machine includes up to 10 states, each one incremented on every rising edge of the hardware trigger.
  • Page 30 NEXT Allows access to the next state of the state machine. Allows the setting of the four parameters describing each state of the CS-1. RF ON/OFF Sets the RF relay to be on or off for this state. FREQ Allows entering the carrier frequency for this state, using the Frequency Entry Menu.

  • Page 31: Instrument Screen

    Increase the value. DOWN Decrease the value. EXIT Exit to previous screen. TIME Set the instrument date and time. Allows access to the PLL Menu to change the reference configuration of CS-1. EXIT Exit to previous menu. Copyright © SpectraDynamics, Inc. 2010...

  • Page 32: Communication Screen

    DISPLAYS Current baud rate setting. MENU REM/LOCL Allows entering remote control mode: CS-1 is now waiting for commands through the RS-232 serial port. The RS-232 port is set as a dumb terminal. A null modem adapter is not needed and should not be used.

  • Page 33: Time Screen

    Time Screen Time Screen The time screen allows changing time and date of CS-1, according to the soft keys described below. DISPLAYS Time current time in the form hh:mm:ss. Date current date in the form mm/dd/yy. MENU TIME Allows entering new time using the Time Entry Menu in the form hh:mm:ss.

  • Page 34: Pll Screen

    100 MHz signal. It should be at least +11 dBm. LVn: indicates the locking voltage for the three PLLs of the CS-1. n=1 is the 5 MHz PLL, while n=2 is the 100 MHz PLL. They are locked when the displayed value is between 0.2 and 0.3.
  • Page 35 PLL Screen MENU Enables the External Reference configuration. The Ext Ref port is now set to receive a 5 MHz signal with level between +10 to +15 dBm. Enables the Internal Reference configuration. The Ext Ref port is now routed to the tuning port of the internal 5 MHz oscillator and is set to receive a DC-coupled tuning signal.

  • Page 36: Warranty

    SDI’s option, any product not meeting the said specifications. This warranty shall be in effect for one (1) year from the date a CS-1 is sold by SDI. SDI makes no other warranty, express or implied, and makes no warranty of the fitness for any particular purpose.
  • Page 37 CS-1/R02...

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