Deviser DS2831 User Manual
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Deviser DS2831 User Manual

Digital tv spectrum analyzer
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DS2831
Digital TV Spectrum Analyzer
User Guide

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Summary of Contents for Deviser DS2831

  • Page 1 DS2831 Digital TV Spectrum Analyzer User Guide...

  • Page 2: Table Of Contents

    Table of Contents PART I: DS2831 BASICS Safety Precautions Maintenance and Safety Considerations Warranty Chapter 1: General Information About the DS2831 Digital TV Spectrum Analyzer Accessories and Measurement Options Technical Support & Service Annual Service Verification Electrostatic Discharge Caution Battery Care...
  • Page 3 DS2831 Digital TV Spectrum Analyzer Chapter 6: Analog Non-Linear Distortion Measurement Carrier-to-Composite Noise Ratio CTB / CSO Chapter 7: Analog TV Video Depth of Modulation (DOM) In-Channel Frequency Response Differential Gain and Differential Phase Chrominance to Luminance Delay Inequality Chapter 8: Digital Signal Measurement...
  • Page 4 DS2831 Digital TV Spectrum Analyzer Chapter 13: Upstream Signal Generator 13-1 Basic Operation 13-2 Sweep Function Chapter 14: Loopback Test Chapter 15: DOCSIS 3.1 Cable Modem Test 15-1 Basic Operation 15-2 Cable Modem Tools Chapter 16: Throughput Testing Chapter 17: PPPoE...
  • Page 5 DS2831 Digital TV Spectrum Analyzer Chapter 28: Detector Mode Chapter 29: International CATV Standards Application Note: A Study of Digital Persistence Analysis PART IV: SYSTEM FUNCTIONS Chapter 30: System Settings 30-1 About (System Information) 30-2 General Settings 30-3 Measure Settings...

  • Page 6: Part Ids2831 Basics

    Part I: DS2831 Basics Part I DS2831 Basics...

  • Page 7: Safety Precautions

    These precautions must be thoroughly understood, and they apply to all phases of operation and maintenance. Deviser Instruments, Inc. assumes no liability for the operator’s failure to comply with these precautions.

  • Page 8: Maintenance And Safety Considerations

    If power fails during the updating process, instrument function may be affected. DANGER: The DS2831 contains an optional VFL (Visual Fault Locator). To avoid eye damage, never look directly into the VFL output port while the light is on, and wear appropriate eye protection when necessary.
  • Page 9 Part I: DS2831 Basics Safety Symbols The following are general definitions of safety symbols used on equipment and in manuals. Dangerous voltage. Protective ground. Frame or chassis ground. Alternating current. Direct current. Alternating or direct current. Caution! Read the manual.

  • Page 10: Warranty

    This Deviser Instruments, Inc. product is warrantied against defects in material and workmanship for a period of 36 months from the date of shipment. Under warranty, Deviser Instruments, Inc. will, at its option, either repair or replace products which prove to be defective.

  • Page 11: Chapter 1: General Information

    Gated C/N, CSO, and CTB measurements, triggering on VITS test signals, allow for non-interfering in-service basic CATV channel tests. By using the appropriate VITS test signal on a specific video line, the DS2831 can also perform video parameter measurements such as differential gain/phase – which the FCC requires to be tested every 3 years.

  • Page 12: Accessories And Measurement Options

    Part I: DS2831 Basics Accessories and Measurement Options The following components and options are available with your DS2831 Digital TV Spectrum Analyzer. Model No. Description Order No. DS2831-002 DS2831 Digital TV Spectrum Analyzer 0110.2800.02 SFL10-KK TOKO F-F Connector 6190.0500.01 DS2831-003 CD (Toolbox Software and Operation Manual) 6190.0600.70...

  • Page 13: Technical Support & Service

    It is recommended to discharge the static by connecting a short or load device to the cable or antenna before connecting them to the DS2831. It is important to remember that the operator may also carry a static charge that can cause damage. Following the practices outlined in the above standards will ensure a safe environment for both personnel and equipment.

  • Page 14: Battery Care

    Part I: DS2831 Basics Battery Care The DS2831 can be supplied with power in two different ways: with a battery or with the power adapter provided. 1-6.1 Battery The DS2831 uses a 7.4V/10Ah lithium battery for autonomous operation. Battery life during continuous use (on a full charge) is estimated at more than 8 hours.
  • Page 15 Part I: DS2831 Basics High-speed charging deck, with dual battery slots With either method, once the instrument reaches full charge, it is recommended to charge for 1 additional hour to help extend the operation time. After charging, unplug the DC connector, and then pull out the AC adapter from the outlet.

  • Page 16: Glossary Of Acronyms

    Part I: DS2831 Basics Glossary of Acronyms Advanced Audio Coding eMTA Embedded multimedia terminal adapter Electronic Program Guide AC-3 Dolby AC-3 audio coding ACPR Adjacent Channel Power Ratio Elementary Stream Audio Engineering Society ETSI European Telecommunications Standards Institute Advanced Encryption Standard...
  • Page 17 Part I: DS2831 Basics NVOD Near Video On Demand Service Description Table OFDM Orthogonal frequency division multiplexing Severely errored second OFDMA Orthogonal frequency division multiple SECAM Sequential Color and Memory access Sequential Couleur avec Memoire Optical Power Meter Service Information...

  • Page 18: Chapter 2: Instrument Overview

    Part I: DS2831 Basics Chapter 2: Instrument Overview This chapter describes how to get started with the DS2831 Digital TV Spectrum Analyzer. Topics covered in this section include: Overview of instrument panels, display, and operation • Changing measurement modes and applications •...

  • Page 19: Front Panel Overview

    3. Brightness Control With the unit powered on, press the green button to the left of the power button to launch the DS2831 screen brightness control. Use the arrow keys (8) or rotary knob (9) to adjust the setting from 0-100%, then press this button again to confirm.

  • Page 20: Top Panel Overview

    GPS dongle option, and other data. LAN port The LAN port is used to connect the device to a PC. The Deviser EDGE platform provides an easy method to manage, archive, analyze, and print measurement data.

  • Page 21: Control Overview

    , N-Type female connector. Maximum input is +21 dBm at 100 VDC. Control Overview The DS2831 employs a 7”, 800x480 capacitive color touchscreen that is configured for ease of use. You can quickly and easily change measurement functions by tapping the screen with a finger or the included stylus pen;...

  • Page 22: Measurement Main Menu

    Part I: DS2831 Basics Measurement Main Menu The DS2831 Digital TV Spectrum Analyzer provides various spectrum analysis measurement modes aimed at simplifying the installation, maintenance and troubleshooting of a CATV broadcasting system. Upstream and downstream measurements are available. These include the following.
  • Page 23 Part I: DS2831 Basics Status bar General Status Icons Wi-Fi function is active. Wi-Fi hotspot function is active. USB storage device connected. PPPoE icon. The 32x8 Cable Modem function is active. If the four dots are red, the Cable Modem is initializing;...

  • Page 24: Measurement Mode Selection

    For instructions on using individual measurement functions, see Part 2: Settings and Measurements. About the Soft Carrying Case The DS2831 can be operated while in the soft carrying case. On the back of the case is a large storage pouch for accessories and power supply.

  • Page 25: Chapter 3: Quick Start Guide (Making A Measurement)

    Chapter 3: Quick Start Guide (Making a Measurement) This chapter will provide the basics of setting up and performing select measurements with the DS2831. Press the Power button (shown below) and use the arrow keys and F7 to log in to an existing user profile (or press F2 to create one).
  • Page 26 Using the Rotary Knob & Arrow Keys When operating any menu on the DS2831, such as the Home measurement menu (shown above), you can use the rotary knob to make selections. In addition, each icon has a number; simply enter that number on the keypad to launch its measurement.
  • Page 27 Part I: DS2831 Basics Spectrum Analysis Menu Maps: Downstream, Upstream, & DPS...
  • Page 28 Set Up Your Channel Plan First Before launching a measurement with the DS2831, it is recommended to set up the channel plan you wish to use for testing. You can do this from the Channel Plan Editor (press CH below the screen).
  • Page 29 Part I: DS2831 Basics Spectrum Analysis In Spectrum Analysis mode, press the rotary knob to bring up the highlight selector. Then turn the knob to highlight the setting you wish to modify. (Alternatively, just tap the setting on the touchscreen.) Then use the rotary knob or arrow keys to quickly set the desired value.
  • Page 30 Part I: DS2831 Basics Reverse Path Sweep The DS2831 features two ways to sweep your reverse path. The first, “Active Reverse Sweep”, synchronizes together with the Kingstone monitoring platform. 1. On the DS2831, set up measurement parameters for reverse path sweep.
  • Page 31 6.4MHz US channels (up to 8 US channels, and enables hi-res sweep traces up to 51.2MHz wide. In the case below, the DS2831 would perform at 8 resolution points fewer than the 192 sweep resolution points in the Passive Sweep app offered with the DS2831.
  • Page 32 Part I: DS2831 Basics 32x8 Cable Modem Measurement Procedure: 1. After properly identifying DOCSIS channels in your channel plan, set parameters for your testing needs. Be sure to set up your DOCSIS channels correctly before initiating the cable modem. 2. In the Cable Modem application, open the DOCSIS channel list and select your desired channel.
  • Page 33 Part I: DS2831 Basics Advanced Upstream Signal Generator (FEC) 1. Fixed frequency mode. 2. Sweep frequency mode.

  • Page 34: Part Ii: Settings And Measurements

    Part II: Settings and Measurements Part II Settings and Measurements...

  • Page 35: Chapter 4: Channel Plans

    The channel plan manager is separated into two panes. Turn the rotary knob to switch between them, and press the arrow keys to move up and down. The left pane lists a total of 16 user plans (up to 100 plans may be stored on one DS2831) that can •...
  • Page 36 Part II: Settings and Measurements NOTE: The DS2831 can recognize analog, digital, and OFDM carriers. However, it cannot distinguish between a digital DVB-C or DOCSIS carrier, so be sure to properly identify your DOCSIS SC-QAM carriers (once only) as the DOCSIS signal type (with other parameters, such as Symbol Rate & Standard). (See below, bottom-left.)

  • Page 37: Editing Channel Plans

    625-line system: Field 1 (odd), line 1~313; Field 2 (even), line 2~312 NOTE: For Analog channels, you will need to instruct the DS2831 where to look for “Gated” quiet line, GCR or Multiburst, CCR-7 VITS test signals, field and line location. If these changes are made during testing, said changes will not be saved for the next test.
  • Page 38 Select OK to save, or Cancel to discard changes. More channel plan templates are available in the DS2831 Toolbox software. Deviser may be able to write customer-specific channel plans upon request.

  • Page 39: Importing And Exporting Channel Plans

    Part II: Settings and Measurements Importing and Exporting Channel Plans To transfer user channel plan data to and from the DS2831, you will first need to insert a USB storage device into the instrument’s top panel. Once the application reads the USB device, the Export (F5) key appears. In addition, if the USB device already contains some channel plan data, Import (F4) appears.

  • Page 40: Chapter 5: Analog Tv

    Part II: Settings and Measurements Chapter 5: Analog TV In this chapter, we discuss the DS2831’s powerful suite of Analog TV signal measurement applications – including the Channel Measurement, Analog FM, FM Demodulation, HUM Modulation, Channel Scan, Passive Sweep, and Tilt functions.

  • Page 41: Analog Fm

    Part II: Settings and Measurements Analog FM The Analog FM measurement screen, shown below, is primarily used to measure FM radio signal levels. 5-2.1 Settings Channel: The channel to measure. Select any active analog or digital channel in the active channel plan.

  • Page 42: Hum Modulation

    Hum is an interference type that generates harmonics following AC frequencies. This phenomenon creates a visible distortion in television signals. With the Hum Modulation function, the DS2831 measures the effects of this interference on analog and digital channels. The analog measurement screen is shown below.

  • Page 43: Channel Scan

    Part II: Settings and Measurements Channel Scan The DS2831 offers a channel scan function to quickly measure the flatness and amplitude of a CATV system (shown below). By default, the instrument scans all active analog or digital channels in the active channel plan.

  • Page 44: Mini-Scan

    Part II: Settings and Measurements Mini-Scan An alternative channel scan function, the Mini-Scan, is included in new DS2831 models. Where the standard channel scan looks at all channels in the active plan, Mini-Scan allows the user to examine up to 16 select channels of special interest.

  • Page 45: Downstream Passive Sweep

    Use Passive Sweep mode to save spectrum data as a reference trace for later comparison. Up to 8 trace records can be saved to the DS2831 as reference traces. This feature is primarily used when an active sweep reference generator is not in use at the HE or hub. Press Start (F1) to begin the measurement.
  • Page 46 Part II: Settings and Measurements The DS2831 features two ways to sweep the reverse path. The first, “Active Reverse Sweep”, works in concert with the Kingstone monitoring platform. 1. On the DS2831, set up measurement parameters for reverse path sweep.
  • Page 47 6.4MHz US channels (up to 8 US channels, and enables hi-res sweep traces up to 51.2MHz wide. In the case below, the DS2831 would perform at 8 resolution points fewer than the 192 sweep resolution points in the Passive Sweep app offered with the DS2831.

  • Page 48: Tilt Measurement

    Part II: Settings and Measurements Tilt Measurement The Tilt measurement helps to quickly measure the flatness of a CATV system and the gain of the splitters / taps. This feature provides power levels for up to 16 channels. Upon entering the Tilt function, you will be prompted to set the tilt channel plan.

  • Page 49: Chapter 6: Analog Non-Linear Distortion Measurement

    In a gated CCN test, the DS2831 will first measure peak carrier level, and then trigger on the appropriate VITS line # (preset for each channel; can be set in the channel plan editor) to measure noise. Occasionally, VITS lines are already quiet enough when video signals are delivered by the Broadcaster.
  • Page 50 Part II: Settings and Measurements Gated CCN Measurement – Frequency Domain Waveform To conduct a gated measurement, ensure that the video carrier frequency, noise bandwidth, TV signal standard, odd/even field, and line number are set properly in the channel plan editor. (See Section 4-2.) CCN gated measurements support the following TV standards: System &...

  • Page 51: Ctb / Cso

    When we measure CSO and CTB, the test results are in terms of C/CSO and C/CTB. In the gated mode, the DS2831 will first measure absolute carrier level, then trigger the appropriate VITS line # (preset for each channel – can be set in the channel plan editor) to measure noise.

  • Page 52: Chapter 7: Analog Tv Video

    Part II: Settings and Measurements Chapter 7: Analog TV Video Analog TV video measurements required by the FCC include: Depth of Modulation, In-Channel Frequency Response, Differential Gain, Differential Phase, and Chrominance-Luminance Delay Inequality. To make these measurements in the gated mode, you must use a VITS inserter to insert the various test signals needed for specific measurements.

  • Page 53: In-Channel Frequency Response

    Markers can be used in either auto or manual mode. Toggle between them by pressing Auto (F3). In Auto mode, the DS2831 will automatically detect the higher and lower levels and display measurement results. In manual mode, the Mark function (F4) is now enabled. Pressing the F4 repeatedly to cycle between Marker...
  • Page 54 Part II: Settings and Measurements In gated mode, two interfaces are available: frequency domain and time domain. Press In Freq/In Time (F2) to toggle between them. Gated ICR– Frequency Domain Waveform Gated ICR–Time Domain Waveform In the time domain interface, the user can view the VITS signal waveform. Note that the resolution bandwidth filter (RBW) can be changed to obtain better measurement results.

  • Page 55: Differential Gain And Differential Phase

    Part II: Settings and Measurements Differential Gain and Differential Phase From the Channel Measurement application, press DG/DP to open the Differential Gain / Differential Phase measurement menu. Differential Gain and Differential Phase are defined as variations of the amplitude and phase of a Color Sub-carrier superimposed on a luminance signal of varying IRE.

  • Page 56: Chrominance To Luminance Delay Inequality

    Part II: Settings and Measurements Chrominance to Luminance Delay Inequality Chrominance and luminance are measured together with the 12.5T test signal. The Chrominance to Luminance Delay measurement is required by the FCC because a large delay displaces the color vs luminance, degrading the edges in the picture.

  • Page 57: Chapter 8: Digital Signal Measurement

    • Parameter Settings The DS2831’s DVB-C analysis function is fully automated, except for a few simple parameters like frequency. All other parameters are acquired automatically (but may still be manually adjusted at the user’s wish). Adjustable parameters and range of the DVB-C function of the DS2831 are as follows.

  • Page 58: Dvb-C Measurement

    Opens MPEG-2 TS analysis function. OFDM The DS2831’s DOCSIS 3.1 cable modem includes upstream and downstream OFDM functionality. OFDM (Orthogonal Frequency Division Multiplexing) distributes a signal among multiple subcarriers, optimizing overall speed and mitigating the effect of impairments that may affect some but not all subcarriers.

  • Page 59: Digital Hum

    Hum modulation, or power source frequency modulation distortion, comes from a power source frequency interference. HUM modulation generally degrades MER values of a digital carrier. The DS2831 supports hum modulation measurements for digital channels. The measurement interface is shown below.

  • Page 60: Constellation Diagram

    Part II: Settings and Measurements Constellation Diagram From the main measurement menu (Home), use the rotary knob to select the Constellation application. The DVB-C constellation diagram function interface is shown to the right. Press the Next function key to open the constellation diagram menu.

  • Page 61: Mer & Ber Statistics Graph

    Part II: Settings and Measurements MER & BER Statistics Graph The DVB-C MER & BER statistics function, shown below, provides analysis over time. BER & MER Statistical Graph BER & MER Statistical History Record The statistics interface is divided into two parts: a statistical graph of change over time, and a summary of current measurement settings.

  • Page 62: Error Vector Spectrum (Evs) Function

    Frequently used LTE bandwidths include 5, 10, and 20MHz. These types of bandwidth are all close to or wider than the DVB-C signal bandwidth. Both LTE and DVB-C are digital signals, and are similar to noise. The DS2831 uses the EVS time-domain function to display LTE sub-frames coming in every 1ms (above, right).

  • Page 63: Adaptive Equalizer, Frequency Response, And Group Delay

    Part II: Settings and Measurements Adaptive Equalizer, Frequency Response, and Group Delay A digital equalizer is an adaptive filter that "optimizes" the received signal – in this case, a MER signal – before demodulation. Equalizers were originally used to minimize inter-symbol interference, the residual effects of one symbol on its neighbors as caused by filters in the communication channel and reflections.
  • Page 64 In this mode, if there is an impedance mismatch somewhere downstream of the measurement location, the DS2831 will display "standing waves" in the frequency response trace. You can determine the approximate distance to the fault or impedance mismatch by using the following formula:...
  • Page 65 Part II: Settings and Measurements 8-7.2 Group Delay Analysis The group delay function is primarily used to verify flatness of the usable frequency band close to filter rolloffs, typically on the upper side of a reverse diplex filter (42MHz in US, 55MHz in Japan, 65MHz in Europe, but soon to be considered at 85MHz or even 200MHz when entering an extended D3.0 or D3.1 network environment).

  • Page 66: Chapter 9: Transport Stream Analysis

    Part II: Settings and Measurements Chapter 9: Transport Stream Analysis The Transport Stream (TS) analysis function supports DVB & ATSC standard real-time TS analysis. Functions include: Basic Information PCR Analysis • • TR 101 290 Priority 1, 2 and 3 Tests Program List •...

  • Page 67: Transport Stream Real-Time Analysis

    Part II: Settings and Measurements Transport Stream Real-time Analysis This function parses the information from audio and video ES. It supports MPEG-1/2/4, H.264 video format and MPEG-1/2/4, AAC audio format. Up to two sets of audio information can be displayed. It lists all programs' SID, Service Name, CA, provider, service type, video PID, video type, Audio1 PID, Audio2 PID, Audio type in the top pane.

  • Page 68: Basic Information

    Transport Stream Basic Information This screen displays basic information for the transport stream. TS RATE: Shows the stream’s transport rate in a second (Mb/s). The DS2831 displays ; Min, Max, Avg and Current TS rate of the last second interval. TS STRUCTURE:...

  • Page 69: Tr 101 290 Priority 1, 2 And 3 Tests

    Priority 1 – no decidability Priority 2 – partially no decidability Priority 3 – errors in the supplementary information/SI Due to hardware resource limits, the DS2831’s TS analysis does not include buffer-test-related parameters. 9-3.1 Priority 1 Parameters (1) TS_sync_loss: It is suggested that five consecutive correct sync bytes are sufficient for sync acquisition, and two or more consecutive corrupted sync bytes indicate a sync loss.
  • Page 70 Part II: Settings and Measurements (5) PMT_error: For each program, a Program Map Table (PMT) is transmitted at maximum intervals of 500 ms. The PIDs of the MAPs are listed in the PAT. The PMT contains the respective PIDs of all elementary streams belonging to this program.
  • Page 71 Part II: Settings and Measurements (4) PCR_discontinity_indicator_error: The PCR_discontinuity_indicator_error is set in the case that a discontinuity of the PCR values occurs and has not been signalled appropriately by the discontinuity indicator. (5) PCR_accuracy_error: If the PCR jitter exceeds ±500 ns, a PCR_accuracy_error will be set. (6) PTS_error: The spacing between two PTS values must not be greater than 700 ms to avoid a PTS error.

  • Page 72: Pid Viewer

    Part II: Settings and Measurements PSI/SI Table Repetition Time Service Information Max. interval Min. interval (complete table) (single sections) 0.5s 25ms 0.5s 25ms 0.5s 25ms 25ms 25ms 25ms 25ms 25ms 25ms 25ms TR 101 290 Priority 1, 2 and 3 Tests Event List TR 101 290 Priority 1, 2 and 3 Tests Event List describes the detailed information for every event, including the number, record time and error detailed information.

  • Page 73: Pcr Analysis

    Part II: Settings and Measurements PCR Analysis Displays the PCR accuracy and PCR interval of the selected program. PCR Accuracy and PCR Interval Analysis As shown above, the top half of the screen displays detailed PCR information in one transport stream, including PCR PID, min/max accuracy and min/max interval.

  • Page 74: Psi/Si Table Analysis

    ETSI Standard ETS300468. They are the following tables: DS2831 PSI/SI analysis includes PAT, PMT, CAT, NIT Actual, SDT Actual, EIT Actual, and TDT. The following screenshots highlight more detailed analysis information. On the left side, use the arrow keys to move the cursor within a table, then press the rotary knob to make your selection.
  • Page 75 Part II: Settings and Measurements PSI/SI Analysis-PAT Table PSI/SI Analysis-PMT Table PSI/SI Analysis-CAT Table PSI/SI Analysis-NIT Table PSI/SI Analysis-SDT Table PSI/SI Analysis-EIT Table PSI/SI Analysis-TDT Table...

  • Page 76: Psi/Psip Table Analysis

    Part II: Settings and Measurements PSI/PSIP Table Analysis Like the SI tables, DVB & ATSC also provide PSIP (Program and System Information Protocol) tables. PSIP stands for "program and system information protocol" and represents a similar store of information to that given on DVB SI.
  • Page 77 Part II: Settings and Measurements The PIDs and Table IDs of the PSIP tables are listed in Table: PSIP Table ID Ranges and Value. ATSC PSIP tables PSIP table hierarchy ETTs carry text messages for describing virtual channels and events. PSI/PSIP Analysis-PAT Table PSI/PSIP Analysis-PMT Table PSI/PSIP Analysis-CAT Table...

  • Page 78: Data Capture

    Part II: Settings and Measurements PSI/PSIP Analysis-VCT Table PSI/PSIP Analysis-EIT Table PSI/PSIP Analysis-ETT Table PSI/PSIP Analysis-STT Table Data Capture Data Capture The image above shows captured transport package data according to PID value. This function divides the PID into six types: video, audio, PCR, PSI/SI, ECM/EMM and DATA. Choose a type and press the rotary knob to confirm;...
  • Page 79 Part II: Settings and Measurements TR 101 290 Priority 1, 2 and 3 Parameter Limits You can set measurement limits on TR 101 290 Priority 1, 2 and 3 tests, applying them to real-time TS analysis. (See above.) Closing and re-opening the TS analysis mode will reset all limits back to default values. PSI/SI Table Repetition Time Service Information Max.
  • Page 80 Part II: Settings and Measurements For data format, you can select either decimalism or hexadecimal. Their PID values are 514 and 0x202, respectively. Note that you must select the correct character encoding according to your local operator’s preferred language and region. If an incorrect data format is used, the parser program will show garbled information.

  • Page 81: Chapter 10: Downstream Spectrum Analysis

    17. Frequency and level of marker B. 18. Delta variation between marker A and B (in frequency and level). 19. Active trace: up to 4 traces can appear at once on the DS2831. Only 1 trace is controlled at a time. 20. Test Point Compensation. (TP) 21.

  • Page 82: Frequency Settings

    Part II: Settings and Measurements 10-1 Frequency Settings Press FREQ (F1) to enter the frequency menu. From there, you can access the various submenus by pressing F1-F7 (shown below). Some parameters, such as the center frequency (4-1220 MHz, or 4-2150 MHz if the frequency extension option has been purchased), can be manually entered with the numerical keypad or adjusted with the arrow keys.
  • Page 83 Part II: Settings and Measurements Amplitude Setting Menu - Attenuator 10-2.3 Setting the Pre-Amplifier Press AMPL> (F2), then AMP (F5) to toggle the pre-amplifier ON (orange) and OFF (blue). When the pre- amplifier is on, an amplifier icon will appear at the lower left corner of the screen. 10-2.4 Setting the Amplitude Scale and Unit Press AMPL>...

  • Page 84: Rbw & Vbw Bandwidth/Sweep Setting

    RBW parameter at the top of the screen. Press BW/SWP> (F3) to enter the submenu and then RBW> (F1). Select Auto to allow the DS2831 to choose a suitable RBW according to sweep speed, span and VBW selections, or Manual to choose an RBW from the following choices: 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz and 3 MHz.

  • Page 85: Markers

    Control and spectrum calculation mode The DS2831 offers two spectrum calculation modes, FFT and DFT. The DFT is the foundation of FFT, and the FFT is the fast algorithm of DFT. Every result calculated with DFT represents a pixel point of the spectrum trace, while every result calculated with FFT represents a segment of the spectrum trace.

  • Page 86: Trace Setting

    10-5 Trace Setting The DS2831 can display 4 traces simultaneously. The display settings are: max. hold, min. hold, average and normal. Each trace is actively displayed on the screen, individually or simultaneously, each with a different color, 1, 2, 3 or 4 traces at a time. You can toggle in a circular way when pressing F1 repeatedly. Press Write (F2) to activate the desired trace.

  • Page 87: Detector Type Setting

    Part II: Settings and Measurements 10-6 Detector Type Setting Press Detector> (F6) to enter the detector mode submenu. Here, you may choose 1 of 5 detector modes: SAM (sample detector, F1) • POS (Positive peak detector, F2) • AVG (Average detector, F3) •...
  • Page 88 Print Mode New to the DS2831 is Print mode. By inverting the screen colors from dark background and a light trace color to a light background and a dark trace color, printing hard copies of saved traces is more cost- efficient.

  • Page 89: A Note On Upstream Spectrum Analysis

    Part II: Settings and Measurements A Note on Upstream Spectrum Analysis The DS2831’s downstream & upstream spectrum analysis functions are almost the same, with a few exceptions. First, for quick ease of use, US spectrum analysis SPAN presets offer several fixed modes: 4-46 MHz, 4-68 MHz, 4-88 MHz, 4-120 MHz and 4-210MHz, however, you can tune any specific SPAN setting either with START/STOP or Center Freq/Span, max span is 206MHz.

  • Page 90: Chapter 11: Persistence Analysis

    QAM signal covered interference signals at higher frequencies, while persistence technology is mostly used to find those TDMA covered interference signals. For a more thorough treatment of the DS2831’s DPS function, see the Application Note: A Study of Digital Persistence Analysis (pg. 155) following Chapter 28 of this user guide.

  • Page 91: Introduction To Persistence Application

    Persistence recording is related to several parameters. Possible values are listed where applicable. Sweep Time: 100 ~ 5000ms. Record Frames: 50 frames max. Max Saved Files: 5 files. The DS2831 offers two persistence recording methods: normal record and trigger record.
  • Page 92 To use trigger recording, you will first need to define a signal pattern for the instrument to recognize. If the received signal matches your pattern, the DS2831 will automatically begin recording. If the signal is not recognized, no persistence recording will occur.
  • Page 93 The current frame number and timestamp are displayed at the bottom of the screen. Alternatively, you can view recordings on a PC with the proper software. Contact Deviser Instruments for more information. Playback Persistence Record...
  • Page 94 Part II: Settings and Measurements Persistence Analysis Menu Tree...

  • Page 95: Chapter 12: Reverse Path Sweep

    The registration process is controlled by the DS1610. The two devices are synchronized with FSK pilot carriers. When a new DS2831 sends a registration request (in the form of a pilot signal transmission) in the upstream path to the DS1610, the DS1610 briefly interrupts communication with all other connected instruments and processes the new DS2831's request.

  • Page 96: Measurement Setup

    Part II: Settings and Measurements 12-3 Measurement Setup 12-3.1 Headend Equipment Setup DS1610 communication setup: Using a PC server, log in to the DS1610 client interface (shown below). Note that proper login credentials are required to access the system and all configuration settings. Contact your system administrator for more information.
  • Page 97 Part II: Settings and Measurements DS1610-1D Upstream Channel Settings 1. Right click the DS1610-1D icon (left) and select Upstream Setting. 2. If entering the upstream parameter setup menu for the first time, click the "Add" button. If a set of parameters already exists, click to highlight it and select Edit.
  • Page 98 Part II: Settings and Measurements Online Troubleshooting, Frequency and Amplitude settings 1. Right-click the DS1610-1D icon (shown below) and select "2800 Online Setting". Open Online Troubleshooting Device Parameters Setting Function 2. Setup menu: Amplitude, TP, Time step and Frequency. Online Troubleshooting Device Parameters List 3.
  • Page 99 2. In this mode, press Setup (F4). Configuring Reverse Sweep involves setting 6 different communication parameters: Pilot Frequency, Down Link Frequency, Up Link Frequency, Pilot Level, IP Compensation (Insertion point compensation), Reverse Sweep Slope and Reverse Sweep Port. DS2831 Main Menu – (reverse sweep) DS2831 Reverse Sweep Communication Settings...
  • Page 100 The example here shows a trace formed from 16 connected discrete-frequency RF signals initially transmitted upstream by the DS2831, then received by the DS1610 at HE. The DS1610 then re-transmits those sweep points through the FSK DS carrier frequency, back to the DS2831. Up to 16 discrete-frequency RF signals can be transmitted upstream by the DS2831.
  • Page 101 “Send pilot …”, “Waiting Pilot…” (with a red icon). When the icon begins alternating between yellow and green, the DS2831 and DS1610 are connected and the DS2831 will start displaying the sweep frequency response trace.
  • Page 102 When the function is valid, a semitransparent area will be displayed above the spectrum curve. Once an active reverse sweep trace is successfully synchronized from the DS2831 to the DS1610: Press List (F2) to open a table of the programmed discrete sweep trace frequencies and their transmission levels.

  • Page 103: Bidirectional Test System Parameters And Range Setup

    200 kHz. Do not insert these comms channels on an occupied spectrum where active signal is present. Input value range = 42 ~ 120 MHz. The value must be identical with "Up Link Freq" in the DS2831 parameter setting.

  • Page 104: System Connection

    DS2831 Connection 1. The DS2831 has two ports: RF and COM. The RF port is the receiver port for local position spectrum signals. Press R-Sweep > Com > RF to enable the RF port to receive the comms signals. The COM port is for upstream transmission being generated by the DS2831 towards the DS1610 system upstream, used in bidirectional measurements.

  • Page 105: Chapter 13: Upstream Signal Generator

    Part II: Settings and Measurements Chapter 13: Upstream Signal Generator The upstream signal generator (USG) optional function is used to characterize the quality of a signal being transmitted in an RF upstream HFC link. The USG generates upstream carrier signals from 5~210MHz (PRBS coding with a QAM signal is desirable if FEC coding of an upstream QAM carrier is required for Pre-Post FEC performance verification).

  • Page 106: Sweep Function

    Single/Repeat, meanwhile, is used to control the frequency sweep to run a single cycle or on a running loop until you press the Stop key. By default, the DS2831’s RF port is used for test signal output. Press RF/COM (F4) to toggle the output port to COM instead.

  • Page 107: Chapter 14: Loopback Test

    Part II: Settings and Measurements Chapter 14: Loopback Test The Loopback Test function is a level test that only provides information on level loss in a loop. The levels measured indicate RF levels measured at the input, as it is received. The output signal generator (indicating the output level generated), minus the received level at the RF IN port, indicates the signal loss in the loop under test.

  • Page 108: Chapter 15: Docsis 3.1 Cable Modem Test

    Chapter 15: DOCSIS 3.1 Cable Modem Test To link a PC to the instrument and use the DS2831 as a DOCSIS 3.1 32x8 or OFDM cable modem, connect a standard Ethernet cable to the LAN port in the DS2831’s top panel. Set the computer network IP settings to DHCP.
  • Page 109 Part II: Settings and Measurements Configure your channel plan before conducting the CM measurement, as shown below.

  • Page 110: Cable Modem Tools

    Part II: Settings and Measurements 15-2 Cable Modem Tools 15-2.1 Cable Modem Info Once the CM has registered, press CM Info (F1) to display downstream/upstream RF signal status. The CM registration status, signal type, and DOCSIS standard are displayed at the top of the screen. Downstream/upstream list parameters are displayed in the 2 panes at the bottom of the screen.
  • Page 111 Once the CM has registered, press IP Info(F3) to show the following network details: MAC address, CM IP address, local IP address (DS2831's IP), subnet mask, default gateway, DNS, and TFTP server IP address. In this interface, press the rotary knob to access the PING measurement interface and measure the connectivity of the selected IP address, as shown.
  • Page 112 Once the test concludes, the data is stored on the DS2831’s hard drive. Insert a USB storage device into the instrument’s top panel. In the CM Log submenu, press Export (F2) to copy the log to the inserted drive.
  • Page 113 Part II: Settings and Measurements 15-2.7 Upstream ICFR Optionally, you can also measure upstream in-channel frequency response, using the Cable Modem’s pre- equilibrium function. In upstream channels, CMTS can acquire channel parameters according to received Cable Modem signals. These channel parameters are transmitted to the corresponding cable modem, which will adjust the emitted upstream signal in response.

  • Page 114: Chapter 16: Throughput Testing

    NOTE: Currently, the Throughput function can only test a cable modem link. 2. Deviser offers a speed test software to assist Throughput. Using a PC installed with the software, deploy the speed test server on the CMTS side of the CM link. Configure and launch the software according to the instructions included.
  • Page 115 Part II: Settings and Measurements 5. Press F2 repeatedly to select the desired test items: upstream, downstream, or both. 6. Finally, press Start (F1) to begin testing. During the test, you may press Stop (F1) at any time to interrupt the test before the scheduled time limit.

  • Page 116: Chapter 17: Pppoe

    Part II: Settings and Measurements Chapter 17: PPPoE As a PPPoE client, you only need to provide a user name and password to initiate PPPoE dialing. Enter a username and password in the top two fields, using the alphanumeric keypad. Once a login is entered, press Connect (F1) to initiate PPPoE dialing.

  • Page 117: Chapter 18: Ping

    Part II: Settings and Measurements Chapter 18: PING PING is effective for quickly verifying your network connectivity status and speed, as shown below. Ping Result Display Input the network or IP address (e.g., www.google.com) to be tested in the host address box at the top, using the alphanumeric keypad.

  • Page 118: Chapter 19: Traceroute

    Traceroute Results Results displayed include the IP address and name of each hop between the DS2831 and the destination host, and the time (in ms) for the data to transmit to and from the routing equipment. Input the desired network address to test in the host address bar, and then press Start (F1) to initiate the test.

  • Page 119: Chapter 20: Ftp

    Part II: Settings and Measurements Chapter 20: FTP The FTP mode is useful for testing upload/download speeds between the DS2831 and an FTP server, as shown below. FTP Test Measurement Settings Server IP: FTP server IP address Port: Sets the port number used by the FTP server (the default is 21) Username Sets the username when connecting to a server that requires credentials.

  • Page 120: Chapter 21: Browser

    If the page is too large to fit on the DS2831’s display, use the rotary knob to scroll up and down.

  • Page 121: Chapter 22: Wifi Analysis

    The WiFi analysis mode is primarily used to display the surrounding WiFi channels, their SSID, their designated channel within the WiFi band used, and their relative amplitude level from the DS2831 location. (See the figures below for the graphical interface.) The WiFi Analysis function has two display modes: graphical and list.

  • Page 122: Chapter 23: Docsis 3.1 Ofdm Ds Channel Test

    Chapter 23: DOCSIS 3.1 OFDM DS Channel Test New to the DS2831, this application allows you to test DOCSIS 3.1 OFDM downstream channel parameters and metrics. Before using this function, be sure to set up your channel plan with a valid DOCSIS 3.1 channel.

  • Page 123: Ofdm Integrated Channel Test

    Part II: Settings and Measurements 23-1 OFDM Integrated Channel Test The integrated channel test contains channel power, MER, profile information, and other basic parameters. To adjust settings, press CH> (F1) to explore the submenu. 23-1.1 Settings Button Operation [Profile / Graph]: Toggles Pane 4 between user profile information (displayed as a table) and OFDM sub- carrier MER graph.
  • Page 124 32 bands, we get 32 distinct data points to connect into a trace. MER Distribution Curve Here, the DS2831 reads the MER of all subcarriers and processes them according to the width of the display window. This appears as the yellow and pink traces in the graph.

  • Page 125: Ofdm In-Band Frequency Response

    Part II: Settings and Measurements In the CH> (F1) menu, enter Profile view to see the profile information table (shown, right). This table shows the status of NCP, PLC, & profiles A, B, C, and D; as well as bit error rate statistics. In the same menu, enter Graph view to see the carrier MER distribution graph.

  • Page 126: Ofdm Spectrum Measurement

    Part II: Settings and Measurements 23-3 OFDM Spectrum Measurement The OFDM spectrum mode is designed to quickly analyze an OFDM channel or full-band spectrum. Press [CH / Full BW] (F1) to toggle between views. Customizable parameters include REF (reference level), display scale, RBW, and VBW. The spectrum display occupies panes 2 and 4 of the OFDM interface, as shown below.

  • Page 127: Chapter 24: Optical Fiber Applications

    Part II: Settings and Measurements Chapter 24: Optical Fiber Applications The DS2831 is equipped with a variety of optical measurement functions and tools, for use in testing and maintenance of fiber-optic communications equipment. These include: Optical power meter (OPM) •...
  • Page 128 Users may replace these with different connector interfaces, as appropriate for field applications. (See below.) NOTE: If you purchased your DS2831 after July 1 2016, the default connector type for the OPM function is SC-APC. VFL is standard with ST-PC.

  • Page 129: Optical Power Meter

    Part II: Settings and Measurements 24-2 Optical Power Meter Optical Power Meter Measurement Screen Procedure: 1. Connect the optical power meter signal input port to the optical fiber for testing. 2. In the Home menu’s optical application page, use the rotary knob to launch the optical power meter function.

  • Page 130: Vfl (Visual Fault Location)

    These light sources are usually termed visual fault locators. Through the VFL port on the DS2831’s top panel, it is possible to perform the same function. When active, the port emits a bright red LED beam.

  • Page 131: Fiber Scope

    2. In the Home menu’s optical application page, use the rotary knob to launch the fiber inspection scope application. 3. The scope’s image will appear on the DS2831 screen. Using the focus knob on the scope, adjust the image until it is clear.

  • Page 132: Part Iii: Background And Concepts

    Part III: Background and Concepts Part III Background and Concepts...

  • Page 133: Chapter 25: Analog Tv Standards & Color Systems

    Part III: Background and Concepts Unit Conversion Chart Unit Impedance 50 Impedance 75 µV 1µV=10-6V 1µV=10-6V 1mV=1000µV 1mV=1000µV dBµV 0dBµV=1µV 0dBµV=1µV dBmV 0dBmV=1mV 0dBmV=1mV 0dBm=107dBµV 0dBm=108.8dBµV Chapter 25: Analog TV Standards & Color Systems There are many different TV standards in use around the world, defining in detail the acceptable baseband and RF structure of a signal.
  • Page 134 Part III: Background and Concepts Reference for the Following Diagrams: Audio carrier Video carrier Color subcarrier VSB: Vestigial Sideband USB: Upper Sideband TV Standard - M, N TV Standard - B, G TV Standard - D, K TV Standard - H TV Standard –...
  • Page 135 Part III: Background and Concepts TV standard and color system parameters setup TV Standard Lines per frame Field frequency Color encoding Color subcarrier NTSC-M 60Hz NTSC 3.58MHz PAL-M 60Hz NTSC 3.58MHz PAL-B 50Hz 4.43MHz PAL-N 50Hz 4.43MHz PAL-N combo 50Hz 3.58MHz 4.406MHz SECAM...

  • Page 136: Chapter 26: Analog Tv Baseband Signals

    Part III: Background and Concepts Chapter 26: Analog TV Baseband Signals 26-1 Understanding Composite Video Signal A composite video signal is a signal containing all three main components required to generate video. These components are: The luminance signal contains the intensity (brightness) information of the video image. •...
  • Page 137 Part III: Background and Concepts The synchronization signals in an analog composite baseband To reproduce an image, both the camera and the video display are scanned horizontally and vertically (see graph a in the above figure). The horizontal lines on the screen are scanned alternately – first the odd- numbered lines, then the even –...

  • Page 138: Principles Of Interlaced Scanning

    Part III: Background and Concepts The active video image resulting from the scanning always has an aspect ratio (horizontal/vertical) of 4/3, regardless of the video format. The color composite video signal shows that the scanning process requires some additional room on the left and right sides of each line, as well as on the top and bottom, of the active video image region.

  • Page 139: Principles Of Gated Measurements

    Part III: Background and Concepts 26-3 Principles of Gated Measurements Field A television image, or frame, is composed of 525 (or 625 lines). When displayed, these are delivered in two successive fields of 262.5 (or 312.5 lines) interlaced together on a CRT. When Field is set to Entire Frame, the line count starts at line one in field one (often referred to as the “odd field”) and ends at 525 (or 625) in field two (often referred to as the “even field”).
  • Page 140 (at the specified field). The DS2831 first measures the video carrier peak level during the sync pulse. Then, while the quiet line inserter removes a specified line at the same time in every frame, the instrument uses the gated function to measure third order beat.
  • Page 141 Part III: Background and Concepts 26-3.2 Video Parameters Gated Measurement VITS (Vertical Interval Test Signal) In the past, engineers often used full-field test signal to test TV systems. This particular test process requires the field or HE engineer to interrupt the specific channels from broadcasting. In today’s HFC networks, for competitive and other reasons, this is no longer a feasible plan.
  • Page 142 Part III: Background and Concepts CCIR Line 18(multiburst) CCIR 18 test signal CCIR 18, also called a multiburst signal, consists of a set of single frequency sine wave signals with equal amplitude. The left side is a white flag with a peak amplitude 420mVp-p and provide amplitude standard for the following multiburst signals.
  • Page 143 Part III: Background and Concepts CCIR 330 test signal The first peak from the left is a white flag with peak amplitude of 700mV (relative to blanking level) and a width of 10 s; a zero carrier reference (base white) for measuring video signal amplitude and depth of modulation.
  • Page 144 Part III: Background and Concepts Applications of VITS Signals Measurement Parameter VITS Signal A brief waveform distortion 2T pulse (CCIR 17) 10T pulse is made up of a sine-squared luminance CLDI pulse and a chrominance packet with a sine-squared envelope (CCIR 17) Chrominance nonlinear distortion Three-level chrominance bar (CCIR 331) Overshoot distortion...

  • Page 145: Chapter 27: Resolution And Video Bandwidth

    The DS2831 offers automatic or manual RBW selection depending on frequency/span/sweep time selection and/or what the user is looking for. The DS2831 uses digital IF and leverages DSP (Digital Signal Processing) techniques of implementation, so the digital filters won’t drift as analog filters would in older spectrum analyzers.

  • Page 146: Chapter 28: Detector Mode

    Part III: Background and Concepts Chapter 28: Detector Mode When measuring and analyzing different types of signals with a spectrum analyzer, the detector mode should be set correctly. “Pixel point” is an important concept related to the detector mode of a spectrum analyzer.

  • Page 147: Chapter 29: International Catv Standards

    Part III: Background and Concepts Chapter 29: International CATV Standards System and Standards by Country Country System Standard Country System Standard Afghanistan El Salvador NTSC Albania Equatorial Guinea Algeria Estonia Argentina Ethiopia Angola Finland Australia France SECAM Antigua & Barbuda NTSC French Guiana SECAM...
  • Page 148 Part III: Background and Concepts Mexico NTSC Sudan Monaco SECAM Surinam NTSC Mongolia SECAM Swaziland Montenegro Sweden Morocco SECAM Switzerland Mozambique Syria SECAM Nepal Tahiti SECAM Netherlands Taiwan NTSC New Zealand Tanzania Nicaragua NTSC Thailand Niger SECAM Tonga NTSC Nigeria Trinidad y Tobago NTSC Norway...
  • Page 149 Part III: Background and Concepts Common CATV Channel Plans: North America EIA channel Standard Incremental Harmonic Video Audio Video Audio Video Audio none 7.0000 11.5000 none 13.0000 17.5000 none 19.0000 23.5000 none 25.0000 29.5000 none 31.0000 35.5000 none 37.0000 41.5000 none 43.0000 47.5000 55.2500 59.7500...
  • Page 150 Part III: Background and Concepts 319.2625 323.7625 319.2625 323.7625 318.0159 322.5159 325.2625 329.7625 325.2625 329.7625 324.0162 328.5162 331.2750 335.7750 331.2750 335.7750 330.0165 334.5165 337.2625 341.7625 337.2625 341.7625 336.0168 340.5168 343.2625 347.7625 343.2625 347.7625 342.0171 346.5171 349.2625 353.7625 349.2625 353.7625 348.0174 352.5174 355.2625 359.7625 355.2625 359.7625 354.0177 358.5177...
  • Page 151 Part III: Background and Concepts 655.2500 659.7500 655.2625 659.7625 654.0327 658.5327 661.2500 665.7500 661.2625 665.7625 660.0330 664.5330 667.2500 671.7500 667.2625 671.7625 666.0333 670.5333 673.2500 677.7500 673.2625 677.7625 672.0336 676.5336 679.2500 683.7500 679.2625 683.7625 678.0339 682.5339 685.2500 689.7500 685.2625 689.7625 684.0342 688.5342 691.2500 695.7500 691.2625 695.7625 690.0345 694.5345...
  • Page 152 Part III: Background and Concepts Common CATV Channel Plans: People's Republic of China (PAL; standard D/K) Channel Bandwidth: 8MHz Ch. No. Video Audio Ch. No. Video Audio 49.75 56.25 DS13 471.25 477.75 57.75 64.25 DS14 479.25 485.75 65.75 72.25 DS15 487.25 493.75 77.25...
  • Page 153 Part III: Background and Concepts Common CATV Channel Plans: Europe (PAL; standard B/G) Channel Bandwidth: 7 and 8 MHz Ch.No. Video Audio Ch.No Video Audio 7MHz channel spacing 8MHz channel spacing 48.25 53.75 303.25 308.75 55.25 60.75 311.25 316.75 62.25 67.75 319.25 324.75...
  • Page 154 Part III: Background and Concepts 687.25 692.75 823.25 828.75 695.25 700.75 831.25 836.75 703.25 708.75 839.25 844.75 711.25 716.75 847.25 852.75 719.25 724.75 855.25 860.75 Common CATV Channel Plans:- United Kingdom (PAL; ITU-R standard I) Channel Bandwidth: 8 MHz Video Audio Video Audio...

  • Page 155: Application Note: A Study Of Digital Persistence Analysis

    -45dBmV (+15dBuV). Turning on the pre-amp would provide an additional 18dB of sensitivity. You can also see how easily the DS2831 will pick up a coherent distortion hiding under this large transmission.
  • Page 156 Part III: Background and Concepts The DS2831 is a True Spectrum analyzer with 80dB of dynamic range, allowing for a much more sensitive capture and acquisition during persistence testing. The unit’s sensitivity can reach -63.5dBmV (@ 300kHz RBW). This allows users to identify issues much sooner, potentially preventing impacts on customer services.
  • Page 157 The larger the span setting, the longer the FFT capture time to ensure 100% POI (Probability Of Interception). This is because the FFT times (in the table above) have been calculated to ensure that the DS2831 will not only capture while the modems are up and transmitting data up to the CMTS, but also during those quiet times (time ticks equal to 6.25us) when the CMTS requires all modems to keep quiet so that it may listen for...
  • Page 158 Spectrum Analyzer). It might also not visibly impact customer service. Based on this scenario, the Deviser R&D team developed algorithms that provide consistent measurement results – with few metrics to control in order to provide optimal results. You can access the Spectrum Persistence analysis from the Upstream main menu. Once in the persistence mode, you will first need to select the bandwidth of interest for your test.

  • Page 159: Part Iv: System Functions

    Part IV: System Functions Part IV System Functions...

  • Page 160: Chapter 30: System Settings

    Part IV: System Functions Chapter 30: System Settings This chapter provides instructions for DS2831 system settings and features. To access the settings menu, press the SETUP button along the bottom of the screen. There are three main settings tabs: About, General, and Measure.

  • Page 161: General Settings

    30-2.1 Network Settings This page contains settings for allowing the DS2831 to interact with other networked devices via Ethernet LAN cable or Wi-Fi. This includes the Local IP, Net Mask, Gateway, and DNS addresses and the DHCP option. Highlight DHCP and press the rotary knob to activate it, or deactivate to keep the static IP settings.
  • Page 162 Part IV: System Functions IPv6 Address Setup The DS2831 is IPv6 compatible. Select IPv6 Setup to open a dialog window. If you wish to input an address manually, check Enable; otherwise, check Auto and the system will auto-configure the IP. (You will need to enter the prefix, gateway, and DNS according to your network configuration –...
  • Page 163 Part IV: System Functions 30-2.2 Display & Battery This page contains power-saving settings to extend battery life on a charge. It also displays the current internal temperature of the instrument in degrees centigrade/Celsius and Fahrenheit. Auto Power Off If the device remains on for a certain amount of time (3, 5, 10, or 30min) without input, it will automatically shut down to preserve power.
  • Page 164 "Picture" file format. 30-2.7 Asset Management Deviser EDGE is cloud-based and can be accessed through the URL provided by Deviser. See the EDGE user guide for complete setup instructions. The option-enabled asset management tab allows you to synchronize your device’s information (including saved data, firmware version, and system clock) with data stored on EDGE.

  • Page 165: Measure Settings

    After total compensation, the test result will display the true network measurement values. DS2831 users can set up a maximum of five groups of TP compensation values. At different positions, user can active different TP compensation values.
  • Page 166 30-3.3 Limit Edit Limits are user-designated signal thresholds; when a measurement breaks an established limit, the DS2831 will alert the user by displaying test results in a Pass/Fail format. From the Limit Edit menu, you can set and modify limit plans on various points of measurement data. The “Enable Limit”...
  • Page 167 On a PC (or other device), open the internet browser of your choice. In the URL bar, enter the DS2831’s local IP address (as found in General > Network Settings) and the port number 1080. Ex.: <192.168.63.23:1080>.

  • Page 168: Chapter 31: File Management

    Part IV: System Functions Chapter 31: File Management The ability to save and manipulate data is a key feature of using the DS2831 Digital TV Spectrum Analyzer. From the File Management utility – accessible by pressing the File ( ) key under the display – you can delete, view, move, and sort data files saved to the system’s internal 1GB hard drive.
  • Page 169 31-1.4 Delete When you no longer need one or more files, you can erase them from the DS2831’s internal hard drive. Highlight files with the rotary knob and press the knob to select them. Delete (F5) will become available. When you press Delete, you will be prompted to confirm the deletion. Press OK to erase the data, or Cancel to go back.

  • Page 170: Importing And Exporting Data

    Importing and Exporting Data To export files to a USB storage device, first ensure the device is connected via the DS2831’s top panel. The USB icon will appear in the status bar. Turn the rotary knob to highlight the desired file, press the knob to select files to export, and then press the Export (F6) button.

  • Page 171: Chapter 32: Saving Data

    Part IV: System Functions Chapter 32: Saving Data The ability to save and manipulate data is a key feature of using the DS2831 Digital TV Spectrum Analyzer. From the Save dialog– accessible by pressing the Save ( ) key under the display – you can create screenshots of the current display, record detailed tables of measurement data, or generate printable work orders with the click of a button.

  • Page 172: Chapter 33: Auto Test

    Auto tests rely on pre-defined User Channel Plans and Limit Plans. There are two types of auto-test: projects and work orders. Projects are tasks created with the DS2831, while work orders are tasks created by the asset and test-data management platform, Deviser EDGE. Work orders...

  • Page 173: Managing Projects

    Highlight and click an auto test project with the rotary knob to select it. Select one or more test projects from the list and press Delete (F6) to erase it from the DS2831. You will be prompted to confirm the deletion. Click OK to confirm or Cancel to go back.

  • Page 174: Work Orders

    (including work orders) with the EDGE server. Deviser EDGE is a web based cloud server application. To work with EDGE, the DS2831’s Certificate and Asset Management options must be enabled. These options allow EDGE to recognize the instrument and manage data.

  • Page 175: Specifications

    DS2831 Digital TV Spectrum Analyzer Specifications Downstream Spectrum Analysis Upstream Spectrum Analysis 4 ~ 1220 MHz Frequency Range 4 ~ 210 MHz Frequency Range 4 ~ 2150 MHz (by option) Frequency Span 42/64/84/116/206 MHz, zero span Frequency Stability ±1 PPM (0 °C ~50 °C / 32-122°F)
  • Page 176 Part IV: System Functions Analog TV Measurements Cable Modem Measurements (Downstream) Frequency Range 7 ~ 1220 MHz Supported Standards DOCSIS 3.0; 3.1 Frequency Range 108~1218 MHz; 258~1218 MHz Standards B/G, I, D/K, L/L’, M/N DOCSIS 3.0 64 QAM, 256 QAM Color Standards NTSC, PAL, SECAM Demodulation...
  • Page 177 Storage Temperature -20 ~ +60 °C Resolution 0.01dBm, mW, μW, nW Wavelengths 850, 980, 1300, 1310, 1490, 1550, 1610nm For a list of DS2831-compatible accessories and Interface FC/SC/ST universal connector software-enabled measurement options available from Deviser, please see Section 1-2.
  • Page 178 Version 180124. ©2018 Deviser Instruments Incorporated. 780 Montague Expressway, Suite 701, San Jose, CA 95131. info@deviserinstruments.com • +1.408.955.0938 • www.deviserinstruments.com...

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