B&K 4070A user manual Pulse Generator Mode, Positive Only, Duty Cycle

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7.6 Pulse Generator Mode

 

 

 

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Pulse Gen

 

Pos

 

Only? N Duty Cycle: 50 %

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

Cont Rep Freq: 2,000,000.00 Hz

1,000 mV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

5

1. Positive Only

This field, when set to “Y”, does not let the output signal go below 0V. This feature is handy when driving circuitry that cannot accept negative voltages. This feature eliminates having to readjust the offset voltage to obtain a positive only signal every time the output level is changed. When this field is set to “Y”, the output level is halved, so that the output signal swings from 0V to ½ the specified level into a 50O load (or 0V to the specified level into an open circuit).

NOTE: If you are using the Pulse Mode to drive digital logic, you should use the SYNC Out connector on the front panel. This signal has the same shape as the SIG Out signal, but comes from a TTL/CMOS driver.

2. Duty Cycle

In this field enter the duty cycle for the pulse waveform, from 0% (always low) to 100% (always high) in 1% steps. The duty cycle is the percentage of the waveform period that the output is high. A waveform with a 10% duty cycle for example means that the output is high for 10% of the time and low for the remaining 90% of the waveform period.

3. Continuous / Triggered mode

In this field select whether the waveform is generated continuously or on a single event basis. If you select Continuous mode, then the waveform is immediately restarted once the end of the waveform is reached. If you select a Triggered mode, then the waveform is halted after the last point is reached, and the waveform is not restarted again until another trigger occurs. The trigger may come simultaneously 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 RS-232 port

To set Continuous mode, press 1. To set Triggered mode, press 0. Pressing arrow keys or rotating the wheel will toggle the mode.

4. Repetition Frequency

In this field enter the frequency at which the function will be repeated. You may enter from 0 Hz (DC) to 2.0 MHz in 1 Hz steps. If a value of 0 Hz is entered, the function waveform clock is halted. A high going synchronization pulse is given on the SYNC Out connector (front panel) at the start of the waveform. In Triggered mode, the waveform is generated once per trigger event. The duration of each waveform will be 1/Repetition Freq.

NOTE: Very low rep rate frequencies, < 1 Hz, can be generated by setting the Repetition Frequency to 1 Hz. This fills the waveform memory with 16,000 points of the desired function. Then go to Arbitrary Waveform Mode and enter the Clock Frequency to obtain the desired function rep rate. Repetition Rate = Clock Frequency / 16,000

5. Level

In this field enter the loaded output level, from 4 mVp -p to 10 Vp -p in 1 mV steps. Into an open circuit, the voltage swing will be twice the specified peak-to-peak value.

Waveforms with very narrow pulses may have signal energy above the cutoff of the output filter (10 MHz). The resultant signal may have a distorted shape and reduced peak-to-peak output swing.

If the Pos Only? field is set to “Y”, and then the output level is halved, so that the output signal swings from 0V to ½ the specified level into a 50O load (or 0V to the specified level into an open circuit).

Offset

You can enter a DC offset voltage by pressing the Offset key. For more information see section 4.4.

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BK Precision 4070A User Manual Rev.2.2

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Contents User’s Manual Page Model 4070A User’s Manual +K Precision CorpTable of Contents Warranty information Remote operationArbitrary waveform system DC Operation OptionIntroduction Description Feature summary ModesSIG Out connector Installation and setupSync out connector External Modulation In connector External Trigger/Gating/FSK/BPSK input External Reference Input / Ext Arb. Clock connector External Arb Sync In / Out connectorRS232 Interface connector Line in connectorMode key Operating controls and keysField arrow keys Recall / Store keyÉ, ê, è, ç keys Trigger keyNumeric keys 0 to 9, MHz/dBm, KHz/Vp-p/Sec, Hz/mVp-p/mS keys One Touch Mode KeysClear key Operating mode selection Operating guideChanging frequency Changing levelEntering a new value Changing valuesModifying an existing value Sinewave Mode 000,000.00 Hz 10.0 dBm Mode descriptionsBasic Sinewave CW Mode Internal AM Mode External AM Mode External AM Mode ParametersExternal AM Input gain 000,000.00 Hz PEP level -10.0 dBm Input GainInternal FM Mode Internal FM Mode ParametersInt FM 1,000 Hz Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Peak Frequency DeviationExternal FM Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm External FM ModeExternal FM Mode Parameters Internal PM Mode Internal PM Mode ParametersPeak Phase Deviation Int PM 1,000 Hz Pk dev 180 deg 000,000.00 Hz 10.0 dBmExternal PM Pk dev 180 deg 000,000.00 Hz 10.0 dBm External PM ModeExternal PM Mode Parameters Sweep Mode Up / Down sweep Sweep timeInternal FSK Mode Internal FSK Mode ParametersMark Frequency Space FrequencyExternal FSK Mode External FSK Mode ParametersExt FSK Mark 1,000,000.00 Hz Space 2,000,000.00 Hz 10.0 dBm Ext FSK InputBurst frequency Burst Mode IntroductionBurst Mode Trig Ton 10,000 mS 000,000.00 Hz Off 10.0 dBm Internal SSB Mode Internal SSB Mode ParametersInt SSB 1,000 Hz Upper Sideband 000,000.00 Hz 10.0 dBm Upper/Lower Sideband selectionsExternal SSB Upper Sideband 000,000.00 Hz +10.0 dBm External SSB ModeExternal SSB Mode Parameters Dtmf Generation Mode Dtmf generation # Duration 200 mS Delay Level -10.0 dBmDtmf Generation Mode Parameters BackgroundDtmf Delay Dtmf DurationDtmf Detection Mode Dtmf Detection Mode ParametersDtmf detection on Ext Mod input 3 # a Dtmf detected digitsPower & Voltage Measurement Mode Power & Voltage Measurement Mode ParametersPower Level Voltage LevelOther mode Arbitrary ModeRemote Mode Int Bpsk 1,000 Hz 000,000.00 Hz 10.0 dBm Internal Bpsk ModeInternal Bpsk Mode Parameters External Bpsk 000,000.00 Hz 10.0 dBm External Bpsk ModeExternal Bpsk Mode Parameters Dualtone Generation Mode 10,000 Hz F2 Ton 000 mS Toff 10.0Dualtone Examples Data Modulation Mode Using the Data Modulation ModeData Modulation Mode Parameters Baud RateDownloading Modulation Message Data Example MessageTriggering the Transmission Saving the MessageVoltage Controlled Oscillator VCO Mode VCO Mode ParametersStart End 1,000,000.00 Hz 10.0 dBm End FrequencyChecking your connection with Hyper Terminal ConnectingRemote Operation Remote Control Operation Remote Control Programming RulesRemote Control Commands Reset 4070A to Sine wave mode× Ø Returns CReport hardware and software versions K1.0 Enable, Disable front panel keys and rotary knobE1,0 Enable, Disable LCD echo to terminal Linear Trig Up Time 10,000 mS F0-9 Move cursor to field 0 to? or H Print help menu Return a CRemote Control Examples ExamplePin 9-pin cable Pin 25 pin cable adapter Arbitrary Waveform ModeQuick Start Guide Introduction to the Arbitrary Waveform System Description of the Arbitrary Waveform GeneratorSwitching Modes Feature SummaryFunction Generator Pulse GeneratorArbitrary Waveform Mode Int Clock / Ext Clock / Lock Master Lock slave modePhase Continuous/Triggered modeFunction Generator Mode Function Gen Wave Pos Ramp Rep Freq 100,000 Hz 000 mVWaveform Repetition FrequencyDuty Cycle Pulse Generator ModePositive Only Using WAVELOAD.EXE Downloading arbitrary waveformsSaving Arbitrary Waveforms Cwaveload /COMx /y /baudz filename.extUsing your own program Rules for Floating Point format Data FormatsFloating Point Format Time & Value Floating Point Format Example #2Digital Format Integer Format Example The data value E468 is handled as follows Hexadecimal FormatRules for Hexadecimal format Example Binary FormatRules for Binary format Generator Multiple Units LockingArb More on Phase Offsets Phase ResolutionStarting Address = Number of waveform points * Phase Offset Waveform Size RestrictionsExample Arb Program Program Listing ARB.BASClose System Subroutines Return Print #1, a Send integer value to 4070A Return Return Wiring Diagram DC Operation Option4070A Specifications Operating ModesSoftware CD RemoteHardware Setup Appendix aCLS CLS Print Print Subroutines END SUB Television Remote Control Example Appendix BCLS 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