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Arbiter Systems 940A Operation Manual

Timing system analyzer
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MODEL 940A
TIMING SYSTEM ANALYZER
OPERATION MANUAL
Arbiter Systems, Inc.
Paso Robles, CA 93446
U.S.A.

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  • Page 1 MODEL 940A TIMING SYSTEM ANALYZER OPERATION MANUAL Arbiter Systems, Inc. Paso Robles, CA 93446 U.S.A.
  • Page 2 This manual is issued for reference only, at the convenience of Arbiter Systems. Reasonable effort was made to verify that all contents were accurate as of the time of publication. Check with Arbiter Systems at the address below for any revisions made since the original date of publication, found on page v.
  • Page 3 IV Modification without the prior written authorization of Arbiter Sys- tems (whether by the substitution of non-approved parts or other- wise). The remedies provided herein are Buyer’s sole and exclusive remedies. In no event shall Arbiter Systems be liable for direct, indirect, incidental...
  • Page 4 FOR THE FASTEST POSSIBLE SERVICE, PLEASE PROCEED AS FOLLOWS: 1. Notify Arbiter Systems, Inc., specifying the instrument model number and serial number and giving full details of the difficulty. Service data or instrument-return authorization will be provided upon receipt of this information.
  • Page 5 Display Screens Specifications 940A Utility Software Appendix A – IRIG-B Information Copyright ©Arbiter Systems Incorporated January 2021 All rights re- served. International copyright secured. PD0054700E A PDF version of this manual is available for download at www.arbiter.com. To reorder the printed manual contact Arbiter Sales...

  • Page 6: Table Of Contents

    Contents Overview Multi-View Display ......Construction ......Input Connectors .
  • Page 7 Driver Software ..... . . 34 Updating the 940A ..... 34...
  • Page 8 List of Figures 940A Connections ..... Male BNC Breakout with Terminals ... .
  • Page 9 1 PPS Source Display Screen ....31 940A Utility ......34 940A Utility Serial Port Settings .

  • Page 11: Overview

    Overview The Model 940A is a powerful diagnostic tool designed to provide both a graphic view and a descriptive view for analyzing timecodes. It features two timing input ports (may be used independently or as a method to compare two timecode signals), one timing output port, a micro USB charging port, a variable output flashlight, a speaker, and an auxiliary...

  • Page 12: Multi-View Display

    Construction The 940A is housed in a tough polycarbonate/polyester alloy, designed for durability and easy handling. The 5-inch diagonal, color graphic, touch screen display is made of tempered, scratch-resistant glass. A bail assembly is provided for propping up the instrument.

  • Page 13: Micro Usb Port

    Power Supply and Batteries The Model 940A operates from the internal batteries or the battery charger. NOTE: The backlight uses the most power. Reducing the backlight intensity from 80 % to 20 % will double the battery life, up to 24 hours.

  • Page 14: Battery Indication

    • H for high (1000 mA) Connecting Cables Coaxial Cables (BNC) Input and output timing connectors on the Model 940A are female BNC. Coaxial cables are usually fitted with male BNC connectors, which connect directly to the 940A. Twisted Pair Cables Use male BNC breakouts, see Figure 2, to adapt twisted pairs of wire to the female BNC input connector on the Model 940A.

  • Page 15: Home Screen

    Home Screen 100% CONFIGURATION DISPLAY INPUT 1 INPUT 1 INPUT 2 INPUT 2 SOURCE INPUT 1+2 SYSTEM SOURCE Figure 3: Home Screen The Home Screen is the first screen after the start-up message. It shows two Home menu categoriess – CONFIGURATION and DISPLAY. CONFIGURATION DISPLAY INPUT 1 –...

  • Page 16: Navigating The Menus

    Navigating the Menus Touch activated areas are blue. The Home Button return to the Home Screen. Gear Button appears when further configuration is possible. Return Button return to the previous menu. Pause Button freeze the display. Play Button resume pausing. Slider Bar allows scanning through the entire signal range to view other elements not in the current display.

  • Page 17: Configuration Screens

    Configuration Screens Configuring Input 1 Figure 4: Input 1 Configuration Screen INPUT 1 1. Touch CONFIGURATION (see Figure 3) to enter the Input 1 CONFIGURATION screen (see Figure 4). 2. Touch signal type or AUTO IRIG-B. AUTO IRIG-B will determine which IRIG-B type is connected.

  • Page 18: Configuring Input

    SOURCE SIGNAL SELECTION menu. 4. Touch to return to the Home screen. Once a signal is selected, the 940A produces the timing signal at source connector. When DISABLED, the 940A will not display the gear symbol.

  • Page 19: Irig Source Configuration

    IRIG Source Configuration The source signal can come from Input 1, Input 2, or Custom. Figure 6: IRIG-B Source Configuration Screen Use for either modulated or unmodulated IRIG-B. 1. Touch Input 1, Input 2, or Custom to select the signal source to transmit IRIG-B from the Source BNC connector.

  • Page 20: Custom Date And Time

    Custom Date and Time 100% H SOURCE IRIG CONFIG Custom User Time 2019 Month Year Hour Minute Second SET TO RTC SET TIME CANCEL CANCEL Figure 7: IRIG-B Source Custom Time Configuration Screen Custom Time window provides a method to manually set the source date and time.

  • Page 21: Source Irig-B Bits

    Source IRIG-B Bits IRIG-B Bits allows you to manipulate the IRIG bits to test time qual- ity and a time change, such as Leap Seconds and Daylight Saving changes. One of the C37.118 values (i.e. 2005 or 2011 from Figure 6) must be enabled for this menu to appear.

  • Page 22: Setting The Dst Clock

    Setting the DST Clock Manually sets the DST clock for a Daylight Saving Time. 100% H CONFIG SOURCE IRIG BITS DST Change Over Time 2017 Month Year Hour Minute Second SET TO RTC SET TIME CANCEL Figure 9: IRIG-B Source DST Configuration Screen 1.

  • Page 23: Unmodulated Irig-B Source Level

    Unmodulated IRIG-B Source Level Sets the drive level for the specific timing output source impedance or voltage. SOURCE OUTPUT LEVEL 100% H HI Drive (125ma @ 5V) HI Drive (50 Ohm Source @ 5V) Variable (50 Ohm Source): Figure 10: IRIG-B Source Output Level Configuration Screen 1.

  • Page 24: Source Dc Voltage Adjustment

    Source DC Voltage Adjustment Use this menu to adjust the 940A source output voltage; works with unmodulated IRIG-B and 1 PPS. 100% H SOURCE OUTPUT LEVEL Edit DC Amplitude Volts SAVE CANCEL Figure 11: IRIG-B Source Voltage Level Configuration Screen 1.

  • Page 25: Modulated Irig-B Source Level

    Modulated IRIG-B Source Level Sets the modulated IRIG-B peak voltage and the modulation ratio. SOURCE OUTPUT LEVEL 100% H Variable Vpeak Modulation Ratio: 10:3 Figure 12: IRIG-B Mod. Source Output Level Configuration Screen 1. From the SOURCE IRIG CONFIGURATION menu screen, touch OUTPUT LEVEL to open the SOURCE OUTPUT LEVEL menu screen.

  • Page 26: Source Modulation Ratio

    Source Modulation Ratio Sets the modulation ratio for modulated IRIG (B12x). 100% H SOURCE OUTPUT LEVEL Edit Modulation Ratio 10:3 Ratio CANCEL SAVE Figure 14: IRIG-B Mod. Source Modulation Ratio Configuration Screen 1. Touch the Modulation Ratio button to select the desired ratio – includes 2:1, 3:1, 10:3, 4:1, 5:1, 6:1, and 7:1.

  • Page 27: Pps Source Configuration

    1 PPS Source Configuration Sets the time signal source from either Input 1, Input 2, or RTC. SOURCE 1PPS CONFIGURATION 100% H TIME SOURCE Input1 Input2 OUTPUT LEVEL Figure 15: 1 PPS Source Configuration Screen 1. From the SOURCE SIGNAL SELECTION menu screen, touch the 1 PULSE PER SECOND button.

  • Page 28: Pps Source Output Level

    1 PPS Source Output Level Sets the 1 PPS source output impedance and voltage. SOURCE OUTPUT LEVEL 100% H HI Drive (125ma @ 5V) HI Drive (50 Ohm Source @ 5V) Variable (50 Ohm Source): Figure 16: 1 PPS Source Output Level Configuration Screen 1.

  • Page 29: Dcf77 Source Configuration

    DCF77 Source Configuration Configures the DCF77 output for this one-minute time code. SOURCE DCF77 CONFIGURATION 100% H TIME SOURCE Input1 Input2 Custom APR 28, 2020 16:44:10 Local -8:00 LOCAL OFFSET Leap Second Configuration Enable Month: Daylight Saving Configuration Enable DST Active MAR 11, 2018 02:00:00 Change Over Time: Figure 18: DCF77 Source Configuration Screen...

  • Page 30: Configuring System

    Configuring System 100% H SYSTEM CONFIGURATION Flashlight: Speaker Volume: Backlight: Auto RTC Date/Time: May 01, 2019 12:34:56 Synchronize RTC: Input 1: Input 2: OFF: Figure 19: System Configuration Screen 1. Flashlight When ON, the slider controls the LED brightness. 2. Speaker When ON the slider controls the volume. 3.

  • Page 31: Manually Setting The Real Time Clock (Rtc)

    Manually Setting the Real Time Clock (RTC) 100% H SYSTEM CONFIGURATION Real Time Clock 2016 Month Year Hour Minute Second SET TIME CANCEL Figure 20: Real Time Clock Configuration Screen 1. Touch to change the date/time selections. SET TIME 2. Touch to set the time/date and return to the system configuration menu.

  • Page 32: Display Screens

    Display Screens From the Home screen there are two categories: CONFIGURATION and DISPLAY. DISPLAY allows you to view the incoming signals from INPUT 1, INPUT 2, both INPUT 1 and INPUT 2, or the outgoing signal using SOURCE. 100% CONFIGURATION DISPLAY INPUT 1 INPUT 1...

  • Page 33: Display Input 1

    Display Input 1 INPUT 1 1. In the Home screen DISPLAY menu, touch 2. See page 6 for a review of the button controls. Unmodulated IRIG-B 100% INPUT 1 IRIG-B UNMODULATED Jitter: 0.47 us, 0.1 rms Time: 00:55:46 UTC TQ: Locked CTQ: <...

  • Page 34: Modulated Irig-B

    Figure 37 for a comparison. Figure 24 shows that the representative modulated IRIG-B wave- form is not a perfect sine wave in all magnifications. The 940A display is not able to reproduce it with resolution. For clarit,y the individual bits in the IRIG string are shown as a modified square wave.

  • Page 35: Pps: Pulse-Per-Second

    PPS: Pulse-Per-Second INPUT 1 ONE PULSE PER SECOND 100% H Pulse Width: 10.0 mSecs Jitter: ---.- uS, ---.- RMS In1 - In2 Delta T: ---.- Amplitude: 4.8 Volts Figure 25: 1 PPS Display Screen The 1 PPS signal is generally a 10 millisecond pulse that occurs every second, with the rising edge on time.

  • Page 36: Dcf77

    DCF77 100% H INPUT 2 DCF77 Time: 08:20:08 Z1: 1 Z2: 0 Jitter: ---.- uS, ---.- RMS Date: 06 OCT 2016 A1: 0 A2: 0 In1 - In2 Delta T: ---.- uSecs DOW: Thu Amplitude: 4.8 Volts Figure 26: DCF77 Display Screen DCF77 is a one minute time code with 58 bits of time information.

  • Page 37: Display Input 2

    Year Information content provided by third parties Month Day of the week Calendar Minute Hour Figure 27: DCF77 Signal Elements show as a 60 second clock. Time and marker details are seen around the circumference of the circle. The 59th second bit is missing for Standard DCF77. Display Input 2 INPUT 2 INPUT 2...

  • Page 38: Display Input 1+2

    Display Input 1+2 INPUT 1 2 INPUT 2 1. In the Home screen DISPLAY menu, touch . Figure 28 shows an example of the text mode. 2. Touch to toggle between the text display and the waveform display. Figure 29 shows an example of the waveform mode. 3.

  • Page 39: Display Source

    Display Source You can view the signal being produced at the source connector, similar to viewing a timing signal at Input 1 or Input 2. In addition the 940A can supply its own signal from the Real Time Clock. Source Field Values Five values are provided in the source viewing screen, the actual number dependent on the signal type.

  • Page 40: Example: Source Unmodulated Irig-B

    Amplitude Provides the measured voltage at the source output. Load Provides the load current produced at the source output. An OVER- LOAD message may appear if the source cannot produce the configured voltage. Modulation Ratio Indicates the configured modulation ratio set up in the modulated IRIG-B SOURCE OUTPUT LEVEL menu.

  • Page 41: Source 1 Pps

    Source 1 PPS Source ONE PULSE PER SECOND 100% H TIME SOURCE INVALID Pulse Width: 10.0 mSecs Timing Source: Input 1 Time Sync: Unlocked 99 Min. Amplitude: 4.8 Volts Load: 0 mAmps Figure 31: 1 PPS Source Display Screen The 1 PPS signal is generally a 10 millisecond pulse that occurs every second, with the rising edge on time.

  • Page 42: Specifications

    Specifications INPUTS Connectors Two, BNC Signals IRIG-B (modulated, unmodulated, modified Manchester), DCF77, 1 PPS Levels 25 Vpk, maximum Impedance Selectable: High Z (410 k ), 50 , 100 In1 - In2 delta t 100 ns resolution, 100 ns accuracy OUTPUT Connector One, BNC Signals...
  • Page 43 POWER Battery Type Li-ion (2250 mAh capacity) Quantity Four (4): 9000 mAh total capacity Operation 24 hours, typical Charge 8 hours to 12 hours with unit off External Voltage +5 Vdc Current Cable 24 AWG Required for optimal charging Connector USB Micro-B GENERAL Physical...

  • Page 44: The 940A Utility

    The 940A Utility software package includes the driver. Updating the 940A 1. Power on the 940A and start the 940A Utility. See Figure 32. Figure 32: 940A Utility 2. Connect the supplied Micro USB cable between the USB 2.0 port...

  • Page 45: 940A Utility Serial Port Settings

    6. Click the Upload To Device button. A progress bar will appear that counts the number of blocks loaded and the total. 7. After the upload, the 940A will restart, pause on the startup screen, and display a message showing success and the new firmware version.

  • Page 46: 940A Firmware Ready To Upload

    Figure 35: 940A Firmware Ready to Upload Figure 36: 940A Upload Progress 9. Verify success from the 940A Utility: select Device, Read to see the firmware version.

  • Page 47: Irig-B Information

    IRIG-B Information Waveform Comparisons ON-TIME 1 PPS Start of next second in time code Unmodulated REFERENCE REFERENCE IRIG ZERO IRIG ONE Modulated Figure 37: 1 PPS & IRIG-B Waveforms Encoding IRIG-B time code signals are either unmodulated or modulated. Unmod- ulated time codes are DC level shift with no carrier signal.
  • Page 48 IRIG-B bit location definitions • BCD Time-of-Year Code Contains time information: seconds, minutes, hours, days, and year. It reads zero (0) hours at 2400 hours each day. It reads day one (1) on day 365 at hour 2400. • Year and Control Functions (CF) Contains year, leap second, Daylight Saving Time(DST), time offset, time quality, parity, and Continuous Time Quality (CTQ).

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