Keysight E6640A User Manual
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Keysight E6640A User Manual

Exm wireless test set
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Keysight E6640A EXM Wireless Test Set
Notice: This document contains references to Agilent.
Please note that Agilent's Test and Measurement
business has become Keysight Technologies. For
more information, go to www.keysight.com.
Source User's
Guide

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Summary of Contents for Keysight E6640A

  • Page 1 Keysight E6640A EXM Wireless Test Set Notice: This document contains references to Agilent. Please note that Agilent’s Test and Measurement business has become Keysight Technologies. For more information, go to www.keysight.com. Source User’s Guide...

  • Page 2: Level And Frequency, Refer To Chapter

    Do not Keysight shall not be liable for errors proceed beyond a CAUTION notice or for incidental or consequential until the indicated conditions are fully damages in connection with the understood and met.

  • Page 3: Source User's Guide

    This Keysight technologies instrument product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, Keysight Technologies will, at its option, either repair or replace products that prove to be defective.
  • Page 4 Source User’s Guide...

  • Page 5: Table Of Contents

    Contents 1 Source Overview Test Set Source Features Modes of Operation Continuous Wave Analog Modulation Digital Modulation List Sequencer 2 Basic Operation Viewing Key Descriptions Setting test set source parameters Presetting the Source Saving and Recalling States Selecting Source Output Setting Frequency and Power (Amplitude) Example: Configuring a 700 MHz, −20 dBm Continuous Wave Output Basic Sequencing...
  • Page 6 Loading (Recalling) a Stored File Reading Error Messages 3 Using Analog Modulation The Basic Procedure 4 Optimizing Performance Using Unleveled Operating Modes ALC Off Mode Using an Output Offset, Reference, or Multiplier Setting an Output Offset Setting an Output Reference Using Amplitude Corrections Selecting a port Setting up a corrections table...
  • Page 7 Using the Pulse/RF Blanking Marker Function Setting Marker Polarity Controlling Markers in a Waveform Sequence Using the TRIGGER 2 OUT Signal as a Test Set Trigger Triggering a Waveform Trigger Type Trigger Source Example: Segment Advance Triggering Setting the Baseband Frequency Offset Alignment Alignment Licensing...
  • Page 8 Signal Loss While Working with a Spectrum Analyzer Signal Loss While Working with a Mixer Preset The Source Does Not Respond Error Messages Licenses A time–based license stops working Cannot load a time–based license Contacting Keysight Technologies Source User’s Guide...

  • Page 9: Source Overview

    Keysight E6640A EXM Wireless Test Set Source User’s Guide Source Overview The source in this instrument can be operated independently of the test set analyzer to provide arbitrary waveform generation to test wireless mobile devices. The source can also be used together with the test set analyzer to simultaneously test both the transmitter and receiver of a wireless device.

  • Page 10: Test Set Source Features

    W–CDMA, cdma2000, 1xEV–DO, GSM, EDGE, and more. For more details on hardware, firmware, software, and documentation features and options, refer to the data sheet shipped with the test set and available from the Keysight Technologies website at: http://www.Keysight.com/find/e6640a Source User’s Guide...

  • Page 11: Modes Of Operation

    Source Overview Modes of Operation The instrument source provides four basic modes of operation: continuous wave (CW), analog modulation, digital modulation, and List Sequencer mode. Continuous Wave In this mode, the test set produces a CW signal. The test set is set to a single frequency and power level, which is set up using the front-panel key menu.
  • Page 12 Source Overview Source User’s Guide...

  • Page 13: Basic Operation

    • “Reading Error Messages" on page 25 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended. The instructions in this chapter for front-panel keys and softkeys apply to the VFP keys.

  • Page 14: Viewing Key Descriptions

    Basic Operation Viewing Key Descriptions Press the key for comprehensive test set information. The online help is Help context-sensitive (that is, the help opens to a page that is relevant to the last key you pressed). Also, while the help screen is open, press any key, and a page relevant to that key is displayed;...

  • Page 15: Presetting The Source

    Basic Operation Presetting the Source Presetting the source is a method of restoring all source settings to their default values, after some or all of them have been changed. If you want to be able to return the source settings to the values they had before the preset, save the current state before you preset the source (see “Saving and Recalling States below).

  • Page 16: Saving And Recalling States

    Basic Operation Saving and Recalling States The current state of the test set (including both source and analyzer settings) can be saved and later recalled. 1. Press the front-panel key, followed by the key. Save State 2. In the key menu, choose a register in which to save the state by pressing State one of the six keys.

  • Page 17: Setting Frequency And Power (Amplitude)

    Basic Operation Setting Frequency and Power (Amplitude) The E6640A test set does not have an Automatic Level Control feature; amplitude NOTE accuracy is regulated by means of calibration for frequency and temperature variations. To set the frequency and power of the source output proceed as follows: 1.
  • Page 18 Basic Operation Source User’s Guide...

  • Page 19: Basic Sequencing

    Basic Operation Basic Sequencing The Source List Sequencer can be used to generate a series of signals, each with its characteristics defined in advance. The procedures below can be used to generate a simple sequence, with frequency and power defined for each step (for more advanced List Sequencer features see Chapter Setting Up the Sequence...
  • Page 20 Basic Operation 4. Select Save As... 5. In the Save As dialog box type in a unique filename for the sequence you have created. The file is saved on the D: drive to My Documents\Sequences. Editing a List Sequencer sweep To edit a sweep that you have set up: 1.
  • Page 21 Basic Operation 3. Select from List Seq Setup menu keys to edit the current sequence. Source User’s Guide...

  • Page 22: Modulating The Carrier Signal

    Basic Operation Modulating the Carrier Signal To modulate the carrier signal, you must have both an active modulation format and modulation of the RF output enabled. This signal can be viewed by setting the analyzer set to the Analog Demod mode with the measurement set to FM. Example 1.

  • Page 23: Working With Files

    Basic Operation Working with Files • “Viewing a List of Stored Files" on page 23 • “Storing a Sequence" on page 24 • “Loading (Recalling) a Stored File" on page 24 The test set recognizes several types of files, such as state files, license files, and list sequence files.

  • Page 24: Storing A Sequence

    Basic Operation Storing a Sequence To store a sequence that you have set up use the front-panel key as Save described in “Saving a List Sweep" on page 19. To store a test set state that you have set up and may want to re-use, use the Save front-panel key and select the State sub-menu to select a register in which to store the state.

  • Page 25: Reading Error Messages

    Online Help or the User’s and Programmer’s Guide. From the online help you can access the Instrument Messages guide (pdf) which describes all the errors associated with the test set. This is also available on the Keysight Technologies website.
  • Page 26 Basic Operation Source User’s Guide...

  • Page 27: Using Analog Modulation

    “The Basic Procedure" on page 28 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended.

  • Page 28: The Basic Procedure

    Using Analog Modulation The Basic Procedure 1. Preset the source (see page 15). 2. Set the carrier (RF) frequency. 3. Set the RF amplitude. 4. Configure the modulation by selecting the front-panel key, followed by Source key. Modulation Setup a. Select a.

  • Page 29: Optimizing Performance

    • “Using Amplitude Corrections" on page 33 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended. The instructions in this chapter for front-panel keys and softkeys apply to the VFP keys.

  • Page 30: Using Unleveled Operating Modes

    Optimizing Performance Using Unleveled Operating Modes ALC Off Mode Turning ALC off deactivates the source automatic leveling circuitry, enabling you to measure the output at a specific point in a test setup and adjust as required for the desired power level at that point. Turning ALC off is useful when the modulation consists of very narrow pulses that are below the pulse width specification of the ALC or when the modulation consists of slow amplitude variations that the automatic leveling would remove.

  • Page 31: Using An Output Offset, Reference, Or Multiplier

    Optimizing Performance Using an Output Offset, Reference, or Multiplier Setting an Output Offset Using an output offset, the source can output a frequency or amplitude that is offset (positive or negative) from the entered value. RF Output = entered value - offset value Displayed Value = output frequency (or power) + offset value To set an offset: •...
  • Page 32 Optimizing Performance RF Output = reference value + entered value To set a reference: 1. Set the frequency or amplitude to the value you want as the output reference level. 2. Frequency: Press . The frequency Source, Frequency, Set Reference Frequency displays 0.00 Hz, indicating that this is the RF output frequency “zero level.”...

  • Page 33: Using Amplitude Corrections

    Optimizing Performance Using Amplitude Corrections Amplitude corrections can be applied to both source and analyzer ports on the test set when the selected mode is Sequence Analyzer. The Amplitude Corrections arrays can be entered by the user, sent over SCPI or loaded from a file. They allow a user to correct the response of the test set for variations in signal paths external to the test set.
  • Page 34 Optimizing Performance the entered values appear on the graticule as a graph. Because of the large number of possible entries in the corrections table, the key allows you to Navigate select an entry by row number to quickly access and edit a particular row. For more detailed information about the correction data keys and the remote control commands see the Sequence Analyzer online help, accessible by pressing the Help button on the front panel (or in pdf format, the User’s and Programmer’s...

  • Page 35: Basic Digital Operation

    • “Licensing" on page 67 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended. The instructions in this chapter for front-panel keys and softkeys apply to the VFP keys.

  • Page 36: Waveform File Basics

    Basic Digital Operation Waveform File Basics There are two types of waveform files: • A segment is a waveform file that you download to the test set. • A sequence is a file you create in the test set source that contains pointers to one or more waveform files (segments, other sequences, or both).

  • Page 37: Storing, Loading, And Playing A Waveform Segment

    Basic Digital Operation Storing, Loading, and Playing a Waveform Segment Before using this information, you should be familiar with the source file menus. If you are not, refer to “Working with Files" on page 23 and familiarize yourself with that information. See also: “Waveform Sequences"...

  • Page 38: Deleting A Waveform Segment From Arb Memory

    Basic Digital Operation 4. Press to open a window on the current directory in which Current Directory... you can re-name or delete any file. Deleting a Waveform Segment from ARB memory Use the following steps to delete a segment from ARB memory. 1.

  • Page 39: Waveform Sequences

    Basic Digital Operation Waveform Sequences A waveform sequence is a file that contains pointers to one or more waveform segments or other waveform sequences, or both. This allows the test set source to play multiple waveform segments, or other sequences, or both, thereby eliminating the need to stop waveform playback just to select another waveform.

  • Page 40: Creating A Sequence

    Basic Digital Operation Header File For a given waveform it is possible to save the ARB settings and parameters in the waveform header file. When the waveform file is then selected for playback by the ARB, the header file settings automatically apply, so that the ARB player is set up the same way each time the waveform plays.

  • Page 41: Viewing The Contents Of A Sequence

    Basic Digital Operation Assumption: Two waveform segments have been created and stored in ARB memory. 1. Menu access a. Press front-panel key. Source b. Press keys. More, Modulation Setup, ARB c. Press keys. More, Waveform Sequences, Build New Sequence 2. Select the first segment a.

  • Page 42: Editing A Sequence

    Basic Digital Operation Editing a Sequence When editing a waveform sequence, you can: • change the number of times each segment plays • delete segments from the sequence • add segments to the sequence • toggle markers on and off (described on page •...

  • Page 43: Playing A Sequence

    Basic Digital Operation 2. Change the first segment so that it repeats 100 times: a. Highlight the first segment entry and press Edit Selected Waveform. b. Press . Enter the number 100. Repetitions 3. Change the repetition for the selected entry to 200: a.
  • Page 44 Basic Digital Operation The display shows the currently selected waveform (for example, Selected Waveform: 16E_10M_ULDL_PUSC_MULT). 2. Generate the waveform: In the menu, press until is underlined. This plays the selected waveform sequence. During the waveform sequence generation, both the I/Q and ARB annunciators turn on, and the waveform modulates the RF carrier.

  • Page 45: Saving A Waveform Settings & Parameters

    Basic Digital Operation Saving a Waveform Settings & Parameters This section describes how to edit and save a file header. When you download only a waveform file (I/Q data, which the source treats as a waveform segment), the source automatically generates a file header and a marker file with the same name as the waveform file.

  • Page 46: Viewing And Modifying Header Information

    Basic Digital Operation 32–Character A description entered for the header, such as a the waveform function. Description Sample Rate The waveform playback rate. This is the ARB sample clock rate, set in the Arb Setup menu. Runtime Scaling The Runtime scaling value is applied in real–time while the waveform is playing. This setting can be changed only for files playing in the dual ARB player.
  • Page 47 Basic Digital Operation The Figure below shows the default file header for the factory–supplied waveform WLAN20MHZ54M64QAM.WFM. The File Settings column shows that most of the settings are Unspecified. Unspecified means that there is no setting saved for that particular parameter. The Current Settings column shows the current source settings.
  • Page 48 Basic Digital Operation b. Set the ARB sample rate to 5 MHz: Press Sample Rate, 5 c. Set waveform runtime scaling to 60%: Press Run-time Scaling 60, Enter d. Return to the Header Utilities menu: Press Return More Header Utilities As shown in the following figure, the Current Settings column now reflects the changes to the current source setup, but the saved header values have not changed.

  • Page 49: Using Waveform Markers

    Basic Digital Operation Using Waveform Markers The source provides four waveform markers to mark specific points on a waveform segment. When the source encounters an enabled marker, an auxiliary signal is routed to a rear panel trigger output. The marker that is routed to the TRIGGER 2 OUT output connector is selected using the Input/Output front-panel key menu.

  • Page 50: Waveform Marker Concepts

    Basic Digital Operation Waveform Marker Concepts The source dual ARB provides four waveform markers for use on a waveform segment. You can set each marker polarity and marker points (on a single sample point or over a range of sample points). Each marker can also perform ALC hold, or Pulse/RF Blanking and ALC hold.
  • Page 51 Basic Digital Operation When you use a waveform that does not have marker routings and polarity settings stored in the file header, and the previously played waveform used Pulse/RF Blanking, ensure that you set Pulse/RF Blanking to . Failure to do so can None result in no RF output or a distorted waveform.
  • Page 52 Basic Digital Operation Example of Correct Use Waveform: 1022 points Marker range: 95–97 Marker polarity: Positive This example shows a marker set to sample the waveform area of highest amplitude. Note that the marker is set well before the waveform area of lowest amplitude.

  • Page 53: Accessing Marker Utilities

    Basic Digital Operation Example of Incorrect Use Waveform: 1022 points Marker range: 110–1022 Marker polarity: Negative This figure shows that a negative polarity marker Marker goes low during the marker on points; the marker Marker On Marker On signal goes high during the off points. The ALC samples the waveform during the off marker points.

  • Page 54: Viewing A Marker Pulse

    Basic Digital Operation Viewing a Marker Pulse When a waveform plays (page 43), you can detect an enabled marker pulse at the rear panel TRIGGER 2 OUT connector. This example demonstrates how to view a marker pulse generated by a waveform segment that has at least one marker point set.

  • Page 55: Setting Marker Polarity

    Basic Digital Operation 1. Using the factory–supplied segment SINE_TEST.WFM, assume Marker 1 is set across points 1−180. 2. From the key menu, assign Pulse/RF Blanking to Marker 1: Marker Routing In the ARB menu, press Marker Utilities Marker Routing Pulse/RF Blank Marker 1 Marker Polarity = Positive When marker polarity is positive (the default...

  • Page 56: Controlling Markers In A Waveform Sequence

    Basic Digital Operation As shown on page Positive Polarity: On marker points are high (≈3.3 V). Negative Polarity: On marker points are low (0 V). Pulse/RF Blanking always occurs on the low part of the signal regardless of the polarity setting. Controlling Markers in a Waveform Sequence In a waveform segment, an enabled marker point generates an auxiliary output signal that is routed to the rear panel TRIGGER 2 output.

  • Page 57: Using The Trigger 2 Out Signal As A Test Set Trigger

    Basic Digital Operation 7. Either rename the sequence (see “Renaming/Deleting a Waveform Segment on Internal Disk" on page 37) or just press to save the sequence with the Enter existing name. The markers are enabled or disabled per the selections, and the changes saved to the sequence file.
  • Page 58 Basic Digital Operation When the TRIGGER 2 OUT signal exhibits jitter and it is used as a measurement trigger, it can cause the waveform to falsely appear as having jitter. If this condition occurs, you can adjust the sample rate to a value (see above) that does not cause the jitter appearance.

  • Page 59: Triggering A Waveform

    Basic Digital Operation Triggering a Waveform Triggers control data transmission by controlling when the test set transmits the modulating signal. You can configure trigger settings so that data transmission occurs once (Single mode), continuously (Continuous mode), or starts and stops repeatedly (Segment Advance modes).

  • Page 60: Trigger Source

    Basic Digital Operation — ignores triggers received while a waveform is playing. If a No Retrigger trigger is received early it will be ignored. The gap in your playback is dependant on the trigger period, after which time the RF will start up again where it is expected.
  • Page 61 Basic Digital Operation • Turn on the RF output. 3. Select a waveform sequence for playback: a. Press front-panel key, followed by Source Modulation Setup, ARB, Select Waveform b. In the display, highlight a waveform sequence file. c. Press Select Waveform 4.

  • Page 62: Setting The Baseband Frequency Offset

    Basic Digital Operation Setting the Baseband Frequency Offset The baseband frequency offset specifies a value to shift the baseband frequency up to ±50 MHz within the ARB 100 MHz signal bandwidth. To access the key press the front-panel key, followed by the Baseband Frequency Offset Source keys.
  • Page 63 Basic Digital Operation b. Press keys to select the RF Input port. RF Input, RF Input Port, RF 2. Select and play the waveform. a. Press the front-panel key, followed by Source Modulation Setup, ARB, Select Waveform b. In the Segments in ARB Memory display, select SINE_TEST.WFM. c.

  • Page 64: Alignment

    Basic Digital Operation Alignment Use the Alignments menu to provide a manual signal alignment of the source. When you execute an alignment of the source. The test set stops any sequence of the source, presets the source, and performs the alignment. Run the source alignment as follows: 1.

  • Page 65: Alignment

    Basic Digital Operation Alignment Use the Alignments menu to provide either automatic or manual signal alignment of the source. The source can be coupled to the system alignment or can be aligned independently of the system alignment. To de-couple the source from the system alignment, press the front-panel System key, followed by the...
  • Page 66 Basic Digital Operation • - select User to carry out an alignment on the source on the current User User Frequency Type frequencies in the User sub-menu. The Align Now, setting determines which part of the source alignment is carried out. Source User provides a quicker alignment when a full alignment is not required.

  • Page 67: Licensing

    You can create your own signal waveforms to output from the test set ARB using a number of methods. One of them is to use Keysight Signal Studio which is a suite of PC-based signal creation software that allows you to create customized signals for multiple radio standards.
  • Page 68 Option 2xx waveform licenses are test set specific (i.e. test set serial number specific). If the licensed waveform segment is transferred from one instrument to another, or to a separate Keysight signal generator, the segment file must be re-licensed on the new instrument by a multi-pack license on that instrument before it can be played back.

  • Page 69: Installing An Option N5182A-22X Waveform 5-Pack Licensing

    Basic Digital Operation Installing an Option N5182A–22x Waveform 5–Pack Licensing 1. Load a Waveform 5–Pack license, Option N5182A–22x, into the source using License Manager or a USB media. For more information on loading the Waveform 5–Pack License, refer to the N5182A–22x Entitlement Certificate. 2.
  • Page 70 Basic Digital Operation Waveform Multi–Pack Licensing Status Messages The following messages appear in the Waveform Multi-Pack license display in the Status column. Table shows the meaning of the entries in the Status column. Waveform Multi–Pack Licensing Status Messages Status Message Meaning Notes Empty field...
  • Page 71 Basic Digital Operation The source displays a catalog of files. 2. Use the arrow keys to highlight and select the file to be licensed. 3. Press Add Waveform to add the selected waveform to the first available slot. A confirmation dialog appears which prompts you to ensure that you want to permanently license this waveform.
  • Page 72 Basic Digital Operation Source User’s Guide...
  • Page 73 “Importing a tsv file into a spreadsheet" on page 85 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended.

  • Page 74: List Sequencer

    List Sequencer can be found in the Sequence Analyzer measurement guide, which is available on the test set and accessed though the online help, Additional Documentation topic. This is also available on the Keysight Technologies website: www.keysight.com/find/ext. Source User’s Guide...

  • Page 75: Terminology

    List Sequencer Terminology Sequence A source sequence consists of a numbered series of steps, during each of which an RF waveform is generated by the test set’s source. Step A step is a user-defined period of time during which a signal with a defined set of parameters is generated.
  • Page 76 List Sequencer • KEY (equivalent to Manual); the sequence is halted until the user presses the manual trigger key on the front panel. A popup window is displayed to indicate that the test set is waiting for the trigger input. (Sending the Bus Trigger SCPI command while the test set is waiting for a manual trigger had no effect.) •...
  • Page 77 List Sequencer Table 0-1 Rad io Standard Rad io Band WCDMA BANDI, BANDII, BANDIII, BANDIV, BANDV, BANDVI, BANDVII, BANDVIII, BANDIX, BANDX, BANDXI, BANDXII, BANDXIII, BANDXIV C2K (cdma2000) or C1X (1xEV-DO) USCELL, USPCS, JAPAN, KOREAN, NMT, IMT2K, UPPER, SECOND, PAMR400, PAMR800, IMTEXT, PCS1DOT9G, AWS, US2DOT5G, PUBLIC, LOWER BAND1, BAND2, BAND3, BAND4, BAND5, BAND6, BAND7, BAND8, BAND9, BAND10,...
  • Page 78 List Sequencer 8: Waveform This parameter specifies the waveform to be generated. The choices are: • <Waveform>: the name of a waveform file currently in ARB memory. The supported file types are .wfm, .bin, and .WAVEFORM. • CONT: Continue Previous (that is, continue playback of the waveform from the previous step in the seequence).

  • Page 79: Front Panel Setup

    List Sequencer 11: Output Trigger This parameter specifies the type of trigger output signal which will be sent at the start of the step. The choices are: • ON: the trigger output is sent to the test set’s analyzer (for triggering of the analyzer list sequencer), and also to the TRIGGER 2 OUT port at the rear panel of the test set.
  • Page 80 List Sequencer Example setup for a two-step sequence • Press Source, More, List Sequencer, List Sequencer Setup • Select Type 2 and press key. Number of Steps. Enter • to 1 Current Step Press and set to More, Step Trigger Free Run 2.

  • Page 81: Saving The Sequence

    List Sequencer. A specially designed spreadsheet template is available on the Keysight web or simply use the guidelines below to make your own. You can take a copy of the spreadsheet template and enter values for the source parameters as required.
  • Page 82 List Sequencer In order to generate a tab separated values file that can be used in the source List Sequencer, the spreadsheet layout should adhere to the following rules which can also be seen in the example in the table above •...

  • Page 83: Tsv File Generation

    List Sequencer Allowed entries for source sequence spreadsheet Spreadsheet Column (Parameter) Allowed Values Step Duration TIME, COUNt, CONTinuous Time / Count Time in ms, or count number (integer) Output Trigger ON, OFF A fast way to populate a spreadsheet which has uniformly distributed values across multiple cells is to enter values in the first two cells in the spreadsheet, select the spreadsheet cells, click and hold the small square at the bottom right of the selection and pull the square across the rows or columns that you require.

  • Page 84: Loading A Tsv File Into The List Sequencer

    List Sequencer Saving spreadsheet as tsv file Loading a tsv file into the List Sequencer When the tsv file is in the My Documents\Sequences directory on the test set it is imported into the List Sequencer using the front-panel key menu. Recall •...

  • Page 85: Tab Separated Value File Editing

    List Sequencer Load tsv file Tab separated value file editing The tab separated value (tsv) file which is used by the test set to set up the Sequence can be edited using a standard text editor. The tsv file is located in the test set on the D-drive at My Documents\Sequences.
  • Page 86 List Sequencer Spreadsheet Open dialog box Select a .txt file to open and select . The Open Text Import Wizard - Step 1 of 3 dialog box opens. The Text Wizard detects that the file is a tab separated values file and automatically selects the radio button.

  • Page 87: Troubleshooting

    • “Contacting Keysight Technologies" on page 96 The E6640A test set has no instrument front-panel. Therefore, the PC mouse and monitor are NOTE required for instrument control through a virtual front panel (VFP). For ease in using the VFP, the PC keyboard is recommended. The instructions in this chapter for front-panel keys and softkeys apply to the VFP keys.

  • Page 88: Front Panel Lock-Up

    Troubleshooting Front panel lock–up • Ensure that the test set is not in remote mode (the R annunciator shows on the display). To exit remote mode and unlock the front panel, press Local Cancel/(Esc). • Ensure that the test set is not in local lockout, which prevents front panel operation.

  • Page 89: Rf Output

    50). Power Supply Shuts Down If the power supply does not work, it requires repair or replacement. If you are unable to service the test set, send the source to an Keysight service center for repair (see “Contacting Keysight Technologies"...

  • Page 90: Distortion

    Troubleshooting 1. Press the front-panel key followed by the key. Press Source Amplitude to set to Power Ref 2. Reset the output power to the desired level. See also “Setting an Output Reference" on page 31. • If you are using the source with an external mixer, see page •...
  • Page 91 Troubleshooting The figure on the right shows a configuration in which the source provides a low amplitude signal to a mixer. Effects of Reverse Power on ALC Source Output Control Mixer ALC Level = RF Output −8 dBm = −8 dBm RF Level Control Detector...
  • Page 92 Troubleshooting Compared to the original configuration, the ALC level is 10 dB higher while the attenuator reduces the LO feedthrough (and the source RF output) by 10 dB. Using the attenuated configuration, the detector is exposed to a +2 dBm desired signal versus the -15 dBm undesired LO feedthrough.

  • Page 93: Preset

    Troubleshooting Preset The Source Does Not Respond If the test set does not respond to a preset, the test set may be in remote mode, which locks the keypad. To exit remote mode and unlock the preset keys, press Local Cancel/(Esc). Source User’s Guide...

  • Page 94: Error Messages

    Troubleshooting Error Messages A complete list of error messages is provided in PDF format on the test set (accessible from the Additional Documentation page of the online help) and also on the Keysight website (www.keysight.com/find/e6640a). Source User’s Guide...

  • Page 95: Licenses

    Troubleshooting Licenses A time–based license stops working • The test set time or date may have been reset forward causing the time–based license to expire. • The test set time or date may have been reset backward more than approximately 25 hours, causing the test set to ignore time–based licenses. Cannot load a time–based license The test set time or date may have been reset backward more than approximately 25 hours, causing the test set to ignore time–based licenses.

  • Page 96: Contacting Keysight Technologies

    If you do not have access to the Internet, please contact your field engineer. In any correspondence or telephone conversation, refer to the test set by its model number and full serial number. With this information, the Keysight representative can determine whether your unit is still within its warranty period.
  • Page 97 Glossary A labeled button on the test set. Active Entry DHCP The currently selected, and Dynamic host communication Gaussian filter therefore editable, entry or protocol parameter. The Gaussian filter does not Dwell Time have a zero Inter-Symbol In a sweep, the time that the Interference (ISI).
  • Page 98 That which survives a power Also referred to as a Root cycle (such as files stored in cosine filter. These filters have USB media). the property that their impulse response rings at the symbol Intermediate frequency Nyquist filter rate. Adjacent symbols do not interfere with each other at the Int Media Also referred to as a cosine...
  • Page 99 Source User’s Guide...
  • Page 100 Transmission control protocol. The most common transport layer protocol used on Ethernet and the Internet. Terminator A unit indicator (such as Hz or dBm) that completes an entry. For example, for the entry 100 Hz, Hz is the terminator. Type-N Connector Threaded RF connector used to join coaxial cables.

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