B&K 4070A user manual Sweep Mode

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5.8 Sweep Mode

Introduction

The Sweep mode continuously changes the frequency of a fixed amplitude sinusoid between a specified start frequency and stop frequency. The user can set sweep time as well. The frequency may be stepped between the start and stop frequency linearly. A sweep direction, up or down, could be specified.

The user could choose continuous or triggered type sweep. In the Continuous mode, the sweep is restarted once the stop frequency reached. In the Triggered mode, the output waits at the start frequency until a trigger condition happens. Triggers can come from a front panel key press, a rising edge on the EXT Trigger connector, or an ASCII "T" on the terminal port. Once a trigger occurs, the output frequency is swept to the stop frequency and the sweep is then reset to the start frequency. The unit then awaits another trigger condition. For downward sweeps, the output frequency begins at the stop frequency and ends at the start frequency.

Sweep Mode Parameters

The Sweep mode has the following front panel display:

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St: 1,000,000.00 Hz

 

Stp: 20,000,000.00 Hz

 

 

 

 

 

 

 

 

 

 

 

Linear Cont Up Time: 60,000 mS -10.0 dBm

 

 

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Figure 5.8-1: Sweep mode display

 

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1. Start Frequency

In this field enter the starting frequency for the sweep. You may enter from 0 Hz (DC) to 21.5 MHz in 0.01 Hz steps.

NOTE: You are not allowed to enter a start frequency that is greater than the stop frequency.

2. Stop Frequency

In this field enter the ending frequency for the sweep. You may enter from 0 Hz to 21.5 MHz in 0.01 Hz steps. NOTE: You are not allowed to enter a stop frequency that is less than the start frequency.

3. Linear / Log sweep

In this field select how the sweep frequency is incremented during the sweep. A linear sweep means that the frequency is incremented by a constant amount for a given amount of time. A log sweep means that the frequency is adjusted logarithmically between the start and stop frequencies as the sweep progresses.

To set Linear type sweep, press 1. To set Log type sweep, press 0. Pressing any arrow key or rotating the wheel will toggle the sweep type between Linear and Log.

4. Continuous / Triggered sweep

In this field select whether the sweep is performed continuously or on a single event basis. If you select a Continuous sweep, then the sweep is immediately restarted once the stop frequency is reached. If you select a Triggered type sweep, then the sweep is halted once the stop frequency is reached. The sweep is not restarted again until another trigger occurs. The trigger can come from three sources:

1.Pressing the Trigger key

2.Applying a low-to-high transition on the Ext Trig In connector

3.Sending an ASCII "T" to the RS232 port

The 4070A will simultaneously accept a trigger from all of the above sources. To set Continuous type sweep, press 1. To set Triggered type sweep, press 0. Pressing any arrow key or rotating the wheel will toggle the sweep type between Continuous and Triggered.

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BK Precision 4070A User Manual Rev.2.2

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Contents User’s Manual Page +K Precision Corp Model 4070A User’s ManualTable of Contents Remote operation Warranty informationArbitrary waveform system DC Operation OptionIntroduction Description Modes Feature summarySync out connector Installation and setupSIG Out connector External Modulation In connector External Trigger/Gating/FSK/BPSK input External Arb Sync In / Out connector External Reference Input / Ext Arb. Clock connectorRS232 Interface connector Line in connectorOperating controls and keys Mode keyField arrow keys Recall / Store keyNumeric keys 0 to 9, Trigger keyÉ, ê, è, ç keys Clear key One Touch Mode KeysMHz/dBm, KHz/Vp-p/Sec, Hz/mVp-p/mS keys Operating guide Operating mode selectionChanging frequency Changing levelModifying an existing value Changing valuesEntering a new value Basic Sinewave CW Mode Mode descriptionsSinewave Mode 000,000.00 Hz 10.0 dBm Internal AM Mode External AM Mode Parameters External AM ModeExternal AM Input gain 000,000.00 Hz PEP level -10.0 dBm Input GainInternal FM Mode Parameters Internal FM ModeInt FM 1,000 Hz Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Peak Frequency DeviationExternal FM Mode Parameters External FM ModeExternal FM Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Internal PM Mode Parameters Internal PM ModePeak Phase Deviation Int PM 1,000 Hz Pk dev 180 deg 000,000.00 Hz 10.0 dBmExternal PM Mode Parameters External PM ModeExternal PM Pk dev 180 deg 000,000.00 Hz 10.0 dBm Sweep Mode Sweep time Up / Down sweepInternal FSK Mode Parameters Internal FSK ModeMark Frequency Space FrequencyExternal FSK Mode Parameters External FSK ModeExt FSK Mark 1,000,000.00 Hz Space 2,000,000.00 Hz 10.0 dBm Ext FSK InputBurst Mode Trig Ton 10,000 mS 000,000.00 Hz Off 10.0 dBm Burst Mode IntroductionBurst frequency Internal SSB Mode Parameters Internal SSB ModeInt SSB 1,000 Hz Upper Sideband 000,000.00 Hz 10.0 dBm Upper/Lower Sideband selectionsExternal SSB Mode Parameters External SSB ModeExternal SSB Upper Sideband 000,000.00 Hz +10.0 dBm Dtmf generation # Duration 200 mS Delay Level -10.0 dBm Dtmf Generation ModeDtmf Generation Mode Parameters BackgroundDtmf Duration Dtmf DelayDtmf Detection Mode Parameters Dtmf Detection ModeDtmf detection on Ext Mod input 3 # a Dtmf detected digitsPower & Voltage Measurement Mode Parameters Power & Voltage Measurement ModePower Level Voltage LevelRemote Mode Arbitrary ModeOther mode Internal Bpsk Mode Parameters Internal Bpsk ModeInt Bpsk 1,000 Hz 000,000.00 Hz 10.0 dBm External Bpsk Mode Parameters External Bpsk ModeExternal Bpsk 000,000.00 Hz 10.0 dBm 10,000 Hz F2 Ton 000 mS Toff 10.0 Dualtone Generation ModeDualtone Examples Using the Data Modulation Mode Data Modulation ModeData Modulation Mode Parameters Baud RateExample Message Downloading Modulation Message DataSaving the Message Triggering the TransmissionVCO Mode Parameters Voltage Controlled Oscillator VCO ModeStart End 1,000,000.00 Hz 10.0 dBm End FrequencyRemote Operation ConnectingChecking your connection with Hyper Terminal Remote Control Programming Rules Remote Control OperationReset 4070A to Sine wave mode Remote Control Commands× Ø Returns CE1,0 Enable, Disable LCD echo to terminal K1.0 Enable, Disable front panel keys and rotary knobReport hardware and software versions F0-9 Move cursor to field 0 to Linear Trig Up Time 10,000 mS? or H Print help menu Return a CExample Remote Control ExamplesQuick Start Guide Arbitrary Waveform ModePin 9-pin cable Pin 25 pin cable adapter Description of the Arbitrary Waveform Generator Introduction to the Arbitrary Waveform SystemFeature Summary Switching ModesFunction Generator Pulse GeneratorInt Clock / Ext Clock / Lock Master Lock slave mode Arbitrary Waveform ModePhase Continuous/Triggered modeFunction Gen Wave Pos Ramp Rep Freq 100,000 Hz 000 mV Function Generator ModeWaveform Repetition FrequencyPositive Only Pulse Generator ModeDuty Cycle Downloading arbitrary waveforms Using WAVELOAD.EXESaving Arbitrary Waveforms Cwaveload /COMx /y /baudz filename.extUsing your own program Floating Point Format Data FormatsRules for Floating Point format Example #2 Time & Value Floating Point FormatDigital Format Integer Format Rules for Hexadecimal format Hexadecimal FormatExample The data value E468 is handled as follows Rules for Binary format Binary FormatExample Arb Multiple Units LockingGenerator Phase Resolution More on Phase OffsetsStarting Address = Number of waveform points * Phase Offset Waveform Size RestrictionsProgram Listing ARB.BAS Example Arb ProgramClose System Subroutines Return Print #1, a Send integer value to 4070A Return Return DC Operation Option Wiring DiagramOperating Modes 4070A SpecificationsRemote Software CDAppendix a Hardware SetupCLS CLS Print Print Subroutines END SUB Appendix B Television Remote Control ExampleCLS Make sure a 4070A is attached to the serial port Print Limited Two-Year Warranty Service Information Savi Ranch Pkwy Yorba Linda, CA 92887 USA TEL