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Operating Manual B+K PRECISION 4051 Multi

1. SPECIFICATIONS TRIPLE OUTPUT DC POWER SUPPLY Output Current Mx esa 204 1 25 39 490 490 Overload Protection Short Circuit Over current Over voltage Reverse Polarity Over temperature Ripple Nowe tomvms 10 10 6 Dualtackmg na 156 16 For continuous operation the output current of Vs supply reduces as output voltage drops see 3 14 for limitations of the Vs supply Vs tracks Vs or independent adjustment Output Voltage 5 V 3 3V 0 24 V 0 24 V Max Vs PHYSICAL PROPERTIES Dimensions 53 x 9 5 x 10 5 Shipping Weight 7 5 lbs 3 4 Kg Power Requirements 115 VAC or 230 VAC 10 50 Hz or 60 Hz Approximately Accessories Operational manual AC power cord BNC cable with clips Logic Probe Options 1 RS 232C D sub 9 pin Male to Female interface cable 2 Universal Solderless Breadboard Kit with Banana Plugs connects to MODEL 4051 directly Page 51 PANEL DIAGRAMS PANEL DIAGRAMS MODEL 4051 MULTIFUNCTION GENERATOR Page 52 BK PRECISION 4051 200 37 MULTI FUNCTION GENERATOR g 26 EXT i OUTPUT Ss PS a 24 MAX 49909 i Vs Vs 0110 5 3 3V Loge ovn 9 Dp 1 3 20 gt 2 m a 0000 00000 000 2 CAL Key Resets the function generator to 50 duty cycle and DC offset to zero Controls Tracking adjustment mo
2. Note For best results the frequency of the carrier signal must be greater than the frequency of the modulating signal Page 27 OPERATION Over Modulation Percent modulation 2B A x 100 A unmodulated carrier level B modulation depth Figure 3 7 Example of AM Modulation Page 28 3 6 MULTIPLE FUNCTION OPERATION In addition to the function generator operation described previously the MODEL 4051 also performs the functions of four other instruments To access the other instruments enter multi function mode by pressing the FUNCTION key Upon each key press the MODEL 4051 will step through its programmed functions one at a time Functions will cycle through in the following order Upon entering the multifunction sequence the FUNCTION key will step forward through the sequence and the OFFSET key will step backwards until the EXT CNTR is reached the first function The ADJUST key will abort the sequence at any time and return to Basic Function Generator mode 3 6 1 AUTORANGING FREQUENCY COUNTER To start this operation press the FUNCTION key while the MODEL 4051 is in Basic Function Generator mode When the display shows the message EXT CNTR and 0 00 Hz the frequency counter is waiting for a signal to be measured To measure a logic signal or signal with a large swing in amplitude e Plug in the logic probe and select the appropriate logic threshold for TTL or CMOS by pushing the LOGIC k
3. CAL gt C SOURCE gt R SET gt S ADJUST gt A FUNCTION gt F SWEEP gt P BURST gt B MOD gt M SYM gt Y LOGIC gt L WAVEFORM gt W ENCODER gt up down 0 0 1 10 2 20 3 30 4 40 5 50 6 60 7 70 8 80 9 90 100 FUNCTION GENERAL DUTY CYCLE NEUTRAL DC_OFFSET NEUTRAL RANGE 20KHz LOGIC 111 AV WAVE_FORM SINE SOURCE INT TRACKING_STATUS NON TRACKING SETTING COARSE ENCODER_SETTING 50 gt Figure 4 1 Initial Output on PC Screen 4 12 TROUBLESHOOTING GUIDE If you experience problems operating your MODEL 4051 please review the troubleshooting tips in this section for solutions to common problems before contacting your dealer PROBLEM As the power is turned ON some of the key switches are disabled or the LCD display acts erratically Static charges prolonged non operation and improper user operation of the MODEL 4051 may cause the switches or LCD screen to malfunction To correct this problem press the ADJUST key If the machine still does not respond reset the machine by using a pin to hold down the Reset button on the front of the 4051 PROBLEM The logic probe functions improperly or with only the green LED logic low flashing For the logic probe to function properly the correct type and voltage threshold must be selected Make sure that TTL 3 3 V or TTL 5 0 V mode is selected for testing TTL circuits and CMOS mode for CMOS circuits In CMOS mode the C LEVEL vo
4. POWER SUPPLY ONE STEP OUTPUT AMPLITUDE CONTROL LOGIC PROBE OPERATION LIMITATIONS OF THE NEGATIVE POWER SUPPLY 20 21 22 22 24 26 28 28 29 30 30 31 32 32 3 33 34 34 34 35 36 36 36 36 37 37 37 30 30 Section Four OPERATING STEPS amp TROUBLESHOOTING 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 INTRODUCTION BASIC FUNCTION GENERATOR MODE FREQUENCY SWEEPING OPERATION OUTPUT SIGNAL BURST OPERATION OUTPUT SIGNAL MODULATION OPERATION FREQUENCY COUNTER LOW FREQUENCY COUNTER AND TOTALIZE COUNTER OPERATION MULTI FUNCTION SIMULTANEOUS OPERATION POSITIVE AND NEGATIVE Vs amp Vs POWER SUPPLY ADJUSTMENT CMOS OUTPUT LEVEL C LEVEL AND ADJUSTMENT PROGRAM MEMORY OPERATION RS 232C COMPUTER INTERFACE EXAMPLE TROUBLESHOOTING GUIDE Section Five SPECIFICATIONS Section Six PANEL DIAGRAMS 39 39 39 40 41 43 43 44 44 45 45 47 49 52 NOTES Page 3 NOTES Page 4 SECTION ONE GENERAL INFO 1 1 1 2 INTRODUCTION The MODEL 4051 programmable multifunction generator is an exceptionally versatile and economical instrument for applications in R amp D Manufacturing Tests Service Repair and Training Featuring an adjustable triple output power supply and waveform generator it has the ability to provide power and signal sources for a circuit while the universal logic probe auto ranging frequency counter and digital voltmeter allow users to simultan
5. voltage to the input jack or the output frequencies can be stepped by applying a stepping DC voltage Note Linear LIN and Logarithmic LOG modes are not available when using an external source since the Sweep mode and timing are fully controlled by the external source Page 24 Figure 3 4 Sweep Operation 3 4 BURST OPERATION The burst function of the 4051 allows for the gating capability of the generator output signal to be switched on and off either by an internally generated signal or by an externally applied signal The gating operation can be selected as Single shot or a Multiple pulse train When the BURST key is pressed during Basic Function Generator mode the display shows the message SINGLE under the BURST key and INT under the SOURCE key To toggle between SINGLE and MULTP burst mode press the BURST key again To toggle between an Internally INT or Externally EXT triggered signal source press the SOURCE key OPERATION To perform Burst operations using an Internal INT trigger source in Note During the Burst operation or after Burst mode is selected Multiple Burst mode some key switches are disabled To abort the function and return to Basic Function Generator mode press the BURST or ADJUST key e Make sure an Internal INT trigger source is selected Press the SOURCE key to toggle Before entering the Burst operation select the desired e Press the BURST key until MULTP burst mode is
6. 6 V Rise Time lt 15 ns Duty Cycle 50 typical CMOS OUTPUT Open Circuit Condition for Frequencies lt 2 MHz Level Output from 3 0 V to 15 0 V 0 5 Vp p Rise Time lt 120 ns VCG Voltage Controlled Generator INPUT Input Voltage 0 10V 0 5 V causes a 10 1 frequency change Impedance 10K ohm 5 SWEEP OPERATION Mode LIN LOG Source Internal External Width 10 1 continuously variable Rate 10 ms to 1 sec continuously variable Sweep Output 0 to 2 V Start Stop Frequency By digital setting Page 49 SPECIFICATIONS AM MODULATION CHARACTERISTICS Source Internal External Modulation Ratio 5 to 100 INT Modulation 1 KHz EXT Modulation DC to 500 KHz EXT Sensitivity Less than 10Vp p for 100 modulation FM MODULATION CHARACTERISTICS Source Internal External Deviation 0 to 5 INT Modulation 1 KHz EXT Modulation DC to 500 KHz EXT Sensitivity Less than 10 Vp p for 100 modulation BURST CHARACTERISTICS Mode Multiple Single or Key controlled one shot Source Internal External Burst Width Continuously variable from 5 to 90 of internal gating frequency Repetition Rate 0 5 Hz to 50 Hz internal or DC to 500 KHz external Burst Frequency Determined by the main generator frequency setting Tone burst is in integral cycles of gated frequency FREQUENCY COUNTER Display shown EXT CNTR Range 3 0 Hz to 35 MHz Auto ranging Resolution 0 01 0 1 1 10 100 Hz Max Display 6 digits Input
7. CMOS output signal level is slightly less than its Vpp supply voltage The user can also view the change from an externally connected scope by connecting the scope input to the TTL CMOS output jack and then setting the LOGIC key setting to CMOS The C LEVEL Adjustment function controls the CMOS output level swing and also the threshold of the CMOS logic probe C LEVEL voltage levels must be adjusted to be equal or close to the voltage of the circuit under test Once the C LEVEL voltage value is set stepping forward or backward in the multifunction sequence will not affect its value To change the C LEVEL voltage value the C LEVEL Operation must be accessed again by stepping forward FUNCTION or backward OFFSET into it from multifunction mode operation Note The output frequency of the CMOS logic increases as the supply voltage increases 7 MHz 15 V Page 31 OPERATION 3 6 6 POSITIVE POWER SUPPLY Vs ADJUSTMENT Pressing the FUNCTION key from the C LEVEL Operation steps the MODEL 4051 into the Positive Power Supply Adjustment Operation indicated by the message Vs and the previously adjusted voltage on the LCD Adjustments can be made to the voltage using the digital encoder Clockwise turns of the encoder will increment the voltage up to 24 V and counterclockwise turns will decrease the voltage down to 0 V During this operation the CAL key will turn on or off TRACKING functionality After the CAL key is presse
8. Operation starts and the display flashes start frequency and stop frequency and blinks the TIME sign e Turn the encoder to adjust the sweeping time from START to STOP While the digital encoder is being turned the sweep operation will temporarily stop To perform a Sweep operation using external control signal source e Make sure that the signal source is set to EXT Press the SOURCE button to toggle e Press the SET key EXT and COARSE FREQ will flash on the display to indicate that the 4051 is ready for an external signal e Use the encoder to adjust the starting frequency e Plug in an external control voltage source to the VCG MOD BNC Page 23 OPERATION input jack The MODEL 4051 can now be operated as a voltage controlled generator The following operations can be performed with an external source e Apply a positive DC voltage to the VCG MOD Input to decrease the frequency Applying approximately 10 V at the input can decrease the output frequency by about 10 times 10 1 ratio Applied voltage should not exceed 10 2 V or the output signal may stop oscillating or become invalid e To operate the function generator as a sweep generator apply a positive ramp signal to the VCG MOD input jack As the ramp voltage increases the frequency decreases The rate of sweep can be adjusted by varying the frequency of the ramp signal e A specific frequency can be selected by applying a fixed DC
9. Parkway Yorba Linda CA 92887 U S A Phone 714 921 9095 Fax 714 921 6422 Include with the instrument your complete return shipping address contact name phone number and description of problem OPERATING MANUAL B K PRECISION MODEL 4051 MUTLI FUNCTION TESTER BK EPICIMA JO DIES VEN 22820 Savi Ranch Parkway Yorba Linda CA 92887 U S A E Phone 714 921 9095 Fax 714 921 6422 Web www bkprecision com O 2004 B K Precision Corporation
10. SECTION FOUR OPERATING STEPS AND TROUBLESHOOTING INTRODUCTION In the previous chapter all operations of the MODEL 4051 were described in detail For improved ease of use this chapter provides step by step operating instructions for each of the 4051 s applications 4 2 BASIC FUNCTION GENERATOR MODE Pressing the ADJUST key at any time will abort any active functions and return the user to the Basic Function Generator in coarse frequency adjustment mode 1 Press the ADJUST key again to toggle into fine frequency adjustment mode if desired 2 Press RNG UP or RNG DN to select the frequency range 3 Press WAVEFORM to select the output signal waveform in sine square or triangle 4 Press the SYM key and turn the digital encoder knob to OPERATING STEPS amp TROUBLESHOOTING make adjustments to the output signal duty cycle 5 Press the OFFSET key to adjust the DC Offset to the output signal 6 Press the CAL key to reset the Duty Cycle and DC Offset back to neutral 7 Press the LOGIC key to select the TTL CMOS logic output signal for TTL 5 V TTL 3 3 V or CMOS 8 Press the SET key to turn ON OFF the LCD back light 4 3 FREQUENCY SWEEPING OPERATION Press the ADJUST key to return to basic function generator mode A Linear LIN Sweeping with Internal INT Control Source 1 Press the SWEEP key 2 Press the SET key 3 Turn the encoder to adjust the starting frequency 4 Press the SET key 5 Turn the
11. control knob is set to Min If the desired output signal is large and clipping occurs an oscilloscope should be used to observe the signal The DC offset does not affect the TTL CMOS output Jack Page 21 OPERATION 1 Zero DC Offset with Maximum Signal 2 Offset Limits Without Clipping Positive N egative DC Offset DC Offset 3 Excessive Offset Positive Negative DC Offset DC Offset FIGURE 3 3 Use of DC OFFSET Control Page 22 3 2 8 OUTPUT LEVEL AMPLITUDE CONTROL The amplitude level of the output signal is adjusted using the Amplitude control knob Rotating this knob clockwise varies the output amplitude from minimum to 40db above minimum The main generator output level is 20 Vp p into an open circuit and 10 Vp p into a 50 OHM load termination The output level of the TTL CMOS output jacks is independent of the Output Level Amplitude Control knob 3 3 SWEEP OPERATION The Sweep function of the MODEL 4051 provides automatic variation of the output frequency From a starting setting to a designated stop setting the frequency can be increased or decreased in a linear or logarithmic format Before entering the sweep operation select the waveform and make adjustments to the frequency amplitude duty cycle and DC offset of the output signal as described previously To perform a Sweep Operation press the SWEEP key while in Basic Function Generator mode The display should show the sign LIN un
12. counter clockwise will decrease the frequency by large units The bar graph will also grow or shrink to indicate the percentage of the current adjusted quantity at this range Fine frequency adjustments can be made by pressing the ADJUST key again OPERATION 3 2 2 FINE FREQUENCY ADJUSTMENT When the ADJUST key is pressed the default adjustment mode is coarse frequency Pressing the ADJUST key a second time will change the adjustment mode to fine frequency Fine frequency mode is indicated by a blinking FINE FREQ sign on the LCD screen When the digital encoder is turned during fine frequency mode quantity adjustments will increase or decrease by smaller units To return to coarse frequency mode press the ADJUST key again 3 2 3 FREQUENCY LOCKING After a desired frequency is tuned by coarse or fine frequency adjustment the frequency locking function is automatically activated holding the variation of the tuned frequency within 0 2 This function is only available when the COARSE FREQ or FINE FREQ is displayed above the ADJUST key NOTE When either the COARSE FREQ or FINE FREQ is set to maxium or minimum quantities the auto frequency locking feature may not function properly due to inadequate adjusting range 3 2 4 RANGING SELECTION Pressing the RNG UP or the RNG DN keys can instantly change the frequency by a decade Eight available ranges can be selecte
13. from O to 24V Note Not Available on MODEL 4050 80000 O PANEL DIAGRAMS Vs Variable negative supply output from O to 24V Note Not Available on MODEL 4050 GND Power supply and system ground terminal Note Not Available on MODEL 4050 5 V 3 3 V Logic supply 5 V or 3 3 V output Note Not Available on MODEL 4050 FUNCTION Key Controls Function and Display Press to advance one function at a time Upon entering this multifunction sequence the FUNCTION key will step forward the OFFSET key will step backward and the ADJUST key will abort the sequence ADJUST Key Select the Coarse or Fine frequency adjust mode press to abort any other function and enter into function generator coarse frequency adjust mode The message display above key indicates the quantity being adjusted by the Digital Encode LCD 5 x1 5 Liquid Crystal Display with CCFL Back light Messages displayed next to corresponding keys as functions are enabled Flashing messages indicate the quantity being adjusted by the encoder LOGIC DVM PROBE The furnished logic probe is connected here for convenient voltage frequency measurement and logic circuit analysis 50 OHM Output Main function generator output with superimposed DC Offset and Duty Cycle adjustment TTL CMOS Output Provides logic signal output with same frequency and Duty Cycle as the 50 OHM Output Ext Counter Input for external frequency mea
14. on the back panel of the MODEL 4051 provides a communication interface to a computer for remote controlled operation The interface cable has DB9 sub female to male connectors The connections between these two connectors are pin to pin straight connections The settings of the RS232 protocols have a baud rate of 9600 bps in 8 bit one stop no parity mode After the inputs and outputs of the MODEL 4051 are connected to the external devices which may be either sensors or activators remote monitoring and control of these devices can be performed for correctional or analytical applications through the connected computer or a networked computer All functions can be controlled remotely by a computer except for the amplitude control potential for the output signal On Windows operating systems no additional software is required The standard Terminal program can be used to remotely control the 4051 When connected to a remote control point the 4051 responds to the following keyboard commands OPERATION Button Key Button Key RNG UP U RNG DN D OFFSET O CAL E SOURCE R SET S ADJUST A FUNCTION F SWEEP P BURST B MOD M SYM Y LOGIC L WAVEFORM W Each function key is represented by a key on the computer keyboard Pressing the corresponding key on the computer performs the same purpose as pushing the actual key on the MODEL 4051 s front panel Press the ENTER key to view changes or responses from the 4051 The Digital Encoder can b
15. the MODEL 4051 may cause internal circuit damage The user should be aware of the maximum limitations of each port 3 11 1 BNC OUTPUT JACK The 50 OHM main generator output is continuously protected up to 25 V and from short circuits to the ground while providing a 20 Vp p output signal into the open circuit and 10 Vp p into the 50 OHM load The TTL CMOS logic signal output is also continuously protected up to 25 V and from short circuits to the ground 3 11 2 BNC INPUT JACK The Ext Counter protects up to the maximum measurement range of 260 V DC AC continuously The VCG MOD and BURST input jack are protected up to 25 V continuously 3 11 3 LOGIC DVM PROBE INPUT The logic probe tip protects up to the maximum measurement range of 260 V DC AC continuously 3 11 4 POWER SUPPLY All the triple output power supplies on the MODEL 4051 are equipped with short circuit over current over temperature and over voltage protection Although the MODEL 4051 has been carefully designed with appropriate protective circuitry exceeding the limitations may still cause damage The following protective measures and considerations are highly recommended e Verify that all signal inputs are connected to valid input sources e Verify the polarity of connections plugged into the power supply ports e For continuous operation of the triple output supplies limit total maximum output power to under 80 W The switchin
16. 00 Hz by pressing the CAL key Note Upon entering the low frequency counter mode the function of the waveform generator is disabled Only the power supply and logic probe are still available All the conditions and applications remain unchanged as in frequency counter mode 3 6 3 TOTALIZE COUNTER TOTAL OPERATION When the FUNCTION key is pressed while in low frequency counter EXT CNTR TOTAL mode the LCD Page 30 will show the message TOTAL and 0 indicating a step through into the Totalize Counter Operation The totalize counter counts the number of transitions in a series of pulse trains with random frequencies and sequences and aggregates the counts The counter is triggered at the positive going edge of the input clock and will count up to 999 999 with a bandwidth of DC to 5 0 KHz To select the appropriate logic threshold triggering level and signal input port follow the procedure outlined in section 3 6 1 To initiate the Totalize Counter to perform a new reading press the CAL key to reset the counter to 0 Note Upon entering the Totalize Counter mode the function of the waveform generator is disabled Only the power supply and logic probe are still available All the conditions and applications remain unchanged as in the Low Frequency Counter mode 3 6 4 DIGITAL VOLTMETER DVM OPERATION The next step in the multi function sequence after the Totalize Counter is the Digital Voltmeter operation When the
17. 4051 a triple output power supply is provided through four banana sockets located on the left lower side of the front panel On the MODEL 4050 special configuration there is no triple output power supply and the four banana sockets are not available FUNCTIONS 2 6 1 Vs JACK Variable positive supply output from 0 to 24 V with typical output current 1 5 A 2 6 2 Vs JACK Variable negative supply output from to 24 V with typical output current 1 5 A The negative supply can be adjusted independently or tracked with Vs positive supply 2 6 3 5 V 3 3 V VCC JACK Logic supply output 5 V or 3 3 V depending on selected mode with typical output current of 5 A 2 6 4 GND JACK Ground terminal for power supply and system inputs outputs 2 7 RESET SWITCH The reset switch is located through a pin hole on the front panel When activated it resets the MODEL 4051 to its factory default state You should only reset your machine if any of the following conditions occurs e The voltage of the golden capacitor has dropped below 1 8V due to the unit being in non operation state for a long period of time and all display and key switches are stuck after the power is turned on Page 13 FUNCTIONS e Any part of the display and key switches are not functioning normally due to static charge or improper operation e All previous settings in the memory file need to be erased To reset the machine the power must be turned on Inse
18. FUNCTION key is pressed to step forward the LCD will show the message DVM and the voltage The DVM operation is able to measure the DC voltage up to 250 V in three auto ranging measurements input from the tip of the logic probe While performing DVM operations the waveform generator is able to make changes in the frequency range waveform and coarse frequency The DC offset and duty cycle will be disabled but both settings can be adjusted prior to entering into multi function mode Since the LOGIC key controls the logic probe s voltage threshold and the power supply maintains the preset output voltages setting the multi function sequence in DVM mode allows for the most convenience in performing multiple testing operations simultaneously 3 6 5 CMOS LOGIC OUTPUT LEVEL ADJUSTMENT Pressing the FUNCTION key from the DVM Operation will advance into the CMOS Logic Output Level Adjustment Operation which is indicated by the message C LEVEL and the previous adjusted Vpp supply voltage for CMOS logic displayed on the LCD The Vpp supply voltage may be changed using the digtial encoder Turning the encoder clockwise increases the voltage up to 16 0 V Counterclockwise rotations decreases the voltage down to 3 0 V OPERATION Note that the voltage being displayed and adjusted is actually the Vpp voltage that is being applied to the CMOS Output Driver and not the actual CMOS output signal level Under normal conditions the
19. ING STEPS amp TROUBLESHOOTING D Multiple MULTP Burst with External Control Source 1 Press the BURST key 2 Press the SOURCE key 3 Press the SET key 4 A multiple signal burst will be fired triggering on the negative going edge of the control signal connected to the BURST BNC input jack The burst width and timing depends on the control signal s duty cycle and frequency 5 Press the SET key to stop the operation and return to step 3 Press the BURST key or ADJUST key to abort the operation at any time 4 5 OUTPUT SIGNAL MODULATION OPERATION Press the ADJUST key to return to basic function generator mode A Frequency Modulate FM the Output Signal with Internal INT 1 KHz Sine Wave 1 Press the MOD key 2 Press the SET key Page 41 OPERATING STEPS amp TROUBLESHOOTING 3 The output signal is frequency modulated by the internal 1KHz sine signal Turn the encoder to adjust the degree of the frequency deviation 4 Press the SET key to stop the operation and return to step 2 Press the MOD key or ADJUST key to abort the operation B Amplitude Modulate AM the Output Signal with Internal INT 1KHz Sine Wave 1 Press the MOD key twice 2 Press the SET key 3 The output signal is amplitude modulated by the internal 1KHz sine signal Turn the encoder to adjust the percentage of the amplitude modulat
20. K GND JACK RESET SWITCH POWER ON OFF SWITCH LCD RS 232C SERIAL PORT VCG OUTPUT HEAT ACTIVATED COOLING FAN Section Three OPERATION 3 1 3 2 1 3 2 2 3 2 3 3 2 4 3 23 THEORY OF OPERATION BASIC FUNCTION GENERATOR OPERATION COARSE FREQUENCY ADJUSTMENT FINE FREQUENCY ADJUSTMENT FREQUENCY LOCKING RANGING SELECTION WAVEFORM SELECTION 11 11 12 12 12 12 12 12 12 13 13 13 13 13 13 13 13 13 14 14 14 15 15 1 18 18 19 19 19 19 Page 1 Page 2 3 2 6 T 3 2 0 3 3 4 3 3 6 3 6 1 3 60 2 3 6 3 3 6 4 3 6 5 3 6 6 3 6 7 3 6 0 3 7 3 8 3 8 1 3 8 2 3 9 3 10 3 11 3 1 1 3 11 2 3 11 3 3 11 4 3 12 3 13 3 14 DUTY CYCLE SYMMETRY CONTROL DC OFFSET CONTROL OUTPUT LEVEL AMPLITUDE CONTROL SWEEP OPERATION BURST OPERATION MODULATION OPERATION MULTIPLE FUNCTION OPERATION AUTORANGING FREQUENCY EXT CNTR COUNTER OPERATION LOW FREQUENCY COUNTER OPERATION TOTALIZE COUNTER TOTAL OPERATION DIGITAL VOLTMETER DVM OPERATION CMOS LOGIC OUTPUT LEVEL C LEVEL ADJUSTMENT POSITIVE POWER SUPPLY Vs ADJUSTMENT NEGATIVE POWER SUPPLY Vs ADJUSTMENT LOGIC POWER SUPPLY Vcc CONTROL TTL CMOS LOGIC CONTROL OPERATION PROGRAM MEMORY OPERATION PROGRAM MEMORY STORAGE OPERATION PROGRAM MEMORY RETRIEVAL COMPUTER REMOTE CONTROL OPERATION RESTORE FACTORY DEFAULT SETTINGS INPUT AND OUTPUT PROTECTION BNC OUTPUT JACK BNC INPUT JACK LOGIC DVM PROBE INPUT
21. N ramp or sawtooth waves and slewed sine waves The sweep generator can digitize start and stop frequencies with variable sweep time displayed in linear or logarithmic mode Burst operation enables the generator output to be controlled by an internal or external signal with a single burst or multiple bursts of a pulse train at a variable width and timing The output can also be amplitude or frequency modulated by a 1 KHz sine wave internally or by an external applied signal Digital adjustments of active quantities is performed by the digital encoder on up to 18 different quantities The active adjustment displays on the bar graph expanding to the right with increasing quantities and shrinking to the left with decreasing quantities Some digital values may be converted into analog quantities by a digital to analog D A converter for analog circuit controls Electrical power for the system is delivered through a switching AC to DC converter The MODEL 4051 has three DC to DC converters to provide output and protection for the triple output power supply Each Page 17 OPERATION supply can be monitored by the DVM while being adjusted The auto ranging DVM can also measure the DC voltage inputted from the logic probe The universal logic probe is able to display all logic states in six unique formats A memory backup feature saves settings and allows the MODEL 4051 to work similar to a conventional mechanical switch operated inst
22. Operating Manual B K PRECISION 4051 Multi Function Generator BK ENCIMA JO DIESEN 22820 Savi Ranch Parkway Yorba Linda CA 92887 U S A Phone 714 921 9095 Fax 714 921 6422 Web www bkprecision com Limited One Year Warranty B K Precision warrants to the original purchaser that its product and the component parts thereof will be free from defects in workmanship and material for a period of one year from the date of purchase B K Precision will without charge repair or replace at its option defective product or component parts Returned product must be freight prepaid and accompanied by proof of the purchase date in the form a sales receipt To obtain warranty coverage in the U S A this product must be registered by completing and mailing the enclosed warranty card to B K Precision 22820 Savi Ranch Parkway Yorba Linda CA 92887 U S A within fifteen 15 days from proof of purchase Exclusion This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alternations or repairs It is void if the serial number is alternated defaced or removed B K Precision shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which v
23. Port Logic Probe or EXT CNTR BNC Jack Page 50 AUTO RANGING COUNTER Input Characteristics Impedance 1 M OHM 100 pf Coupling AC Ext counter BNC input DC logic probe input Max Overload Protection 260 V AC DC Sensitivity lt 0 45 Vrms Accuracy Time base accuracy 1 count trigger Triggering Threshold Selectable for TTL CMOS logic threshold or 0 3 5 V continuously adjustable triggering level LOW FREQUENCY COUNTER Display shown EXT CNTR TOTAL Range 0 04 Hz to 3 Hz Resolution 0 01 0 001 Hz Max Display 4 digits Input Port Logic Probe only TRANSITION TOTALIZE COUNTER Display shown TOTAL Frequency Range up to 5 0 KHz Max Display 6 digits Reset Key CAL Input Port Logic Probe for DC coupling or EXT CNTR BNC Jack when frequency is greater than 3Hz AUTO RANGING DVM Input Range 0 to 2 500 25 00 V DC 250 0 V Auto ranging Resolution 1 mV 10 mV 100 mV Accuracy 0 75 Input Protection Max 260 V DC AC Impedance 1 MOHM Max Display 4 digits UNIVERSAL LOGIC PROBE Logic Threshold m os High Threshold 2 0V 10 70 Vdd 15 Low Threshold 0 8V 10 30 Vdd 15 Vdd is controled by C Level MAX Repetitive Frequency Response 35 MHz With probe miniature clip to GND Min Single Pulse Detection 15 ns With probe miniature clip to GND Display Format Logic High Logic Low Square clock Positive Going Pulse Negative Going Pulse Tri state
24. ary from state to state Model Number Date Purchased Purchase Agent Owner BK EFNICIMA Jo Re Loli MODEL 4051 Multi Function Generator Operating Manual IMPORTANT The information in this document is subject to change without notice B K Precision Corporation assumes no responsibility for any error which may appear in this document BK PRECISION MODEL 4051 Operating Manual Table of Contents Warranty Inside Front Cover Section One a gt gt gt 58 90 680 1 Section Two Zell 22 2 2 1 2 2 2 2 2 3 2 2 4 2 2 5 2 2 6 2 2 7 2 2 8 2 2 9 2 2 10 2 2 11 2 2 12 GENERAL INFORMATION INTRODUCTION FEATURES UNPACKING AND INSPECTION INSTRUMENT IDENTIFICATION INSTRUMENT POWER AND CARE FUNCTIONS INTRODUCTION FUNCTION KEY SWITCH CAL KEY SOURCE KEY SWEEP KEY BURST KEY MOD KEY SET KEY RNG UP KEY RNG DN KEY WAVEFORM KEY SYM KEY OFFSET KEY LOGIC KEY N NNO 01 2 2 13 2 2 14 29 Lael 292 2 4 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 2 2 6 2 6 1 2 02 2 6 3 2 6 4 2 7 2 8 29 2 10 2 11 2 12 ADJUST KEY FUNCTION KEY CONTROL KNOB DIGITAL ENCODER AMPLITUDE POT BNC OUTPUT AND INPUT JACK 50 OHM OUTPUT TTL CMOS OUTPUT EXT COUNTER INPUT VCG MOD INPUT BURST INPUT LOGIC DVM PROBE JACK TRIPLE OUTPUT DC POWER SUPPLY JACK Vs JACK Vs JACK 5 V 3 3 V VCC JAC
25. ckwise to decrease the voltage until the desired Vdd is reached Note The the actual CMOS output signal level is slightly less than the displayed C LEVEL Voltage 4 10 PROGRAM MEMORY OPERATION Press the ADJUST key to return to basic function generator mode A To Save Current Settings to Memory 1 Press the SOURCE key to scroll through the ten storage slots Occupied slots are denoted with the CAL sign 2 Press the SET key to save active settings to the numbered storage slot shown on the display If the slot is occupied the data saved in it will be overwritten with the current active settings OPERATING STEPS amp TROUBLESHOOTING B To Retrieve Saved Settings from Memory 1 Press the SOURCE key to scroll through the ten storage slots 2 Stop on the desired program number The slot should be marked with the CAL sign indicating that the slot is being used for data storage 3 Press the CAL key and the settings saved to the memory slot will be retrieved and loaded for immediate use 4 11 RS 232C COMPUTER INTERFACE EXAMPLE Most PCs running the Windows operating systems are able to support the RS 232C interface used by the MODEL 4051 to connect to a computer for remote testing operations No additional software is required The following set up instructions for the remote interface are written specifically for the Windows 98 operating system Set up for other Windows op
26. d and the message TRACKING is shown on the display the negative power supply Vs will be adjusted to mirror the positive power supply Vs voltage value in the opposite polarity Once TRACKING mode is deactivated the positive and negative power supply voltages can be adjusted separately again Once the Positive Power Supply adjustment is set it will remain set while other functions are accessed To change the Vs value the Positive Power Supply Adjustment operation must be accessed again by stepping into it while in multifunction operation mode Page 32 3 6 7 NEGATIVE POWER SUPPLY ADJUSTMENT Pressing the FUNCTION key from the Positive Power Supply Adjustment Operation will step into the Negative Power Supply Vs Adjustment Operation which is indicated with the message Vs and the previous adjusted voltage value on the LCD The value can be adjusted using the digital encoder with clockwise turns increasing voltage up to 24 V and counterclockwise turns decreasing voltage down to 0 V During this operation the CAL key will turn on or off TRACKING functionality After the CAL key is pressed and the message TRACKING is shown on the display the negative power supply Vs will be automatically adjusted to mirror the positive power supply Vs voltage value in the opposite polarity Once TRACKING mode is deactivated the positive and negative power supply voltages can be adjusted separately again O
27. d from 2 Hz to 20 MHz To use this function select the range and then adjust the frequency by using the coarse and or fine frequency adjustments Output frequencies from 0 15 Hz to 20 MHz can be precisely and rapidly set The frequency display in the 2 Hz range may take extra time to respond 3 2 5 WAVEFORM SELECTION At any time except in frequency counter mode pressing the WAVEFORM key can change the output waveform sine square and triangle The corresponding waveform appears sequentially each time the key is pressed Page 19 OPERATION SQUARE OV TRIANGLE OV FIGURE 3 1 Output Waveform and Phase Relationship Page 20 3 2 6 DUTY CYCLE SYMMETRY CONTROL When the SYM key is pressed while in basic function generator mode the message DUTY CYCLE will blink above the ADJUST key to indicate activation of duty cycle controls Turning the encoder clockwise will increase the duty cycle percentage Turning it counterclockwise will adjust the duty cycle percentage downward If the duty cycle percentage is above 50 a arrow will display next to the ADJUST key and when the duty cycle percentage is below 50 a will be displayed If the duty cycle is at exactly 50 no arrows will be displayed as long as the generator outputs the signal Pressing the CAL key will bring the signal back to symmetry again and the duty cycle arrows will d
28. d logic probe allows the user to analyze the circuit activities on the circuit board The frequency or DC Voltage with the logic state of the signals can be measured and displayed simultaneously Logic signal data is displayed through the red and green LED lights on the logic probe The light intensity of the flashing Red and Green LEDs indicates the duty cycle of the clock For the logic probe to function properly the correct type and voltage threshold must be selected Make sure that TTL 3 3 V or TTL 5 0 V mode is selected Page 38 for testing TTL circuits and CMOS mode for CMOS circuits In CMOS mode the C LEVEL voltage level must be adjusted to be equal or come close to the Vdd of the circuit under test 3 14 LIMITATIONS OF THE NEGATIVE POWER SUPPLY For continuous operation the 4051 s negative output power supply has output current limitations When the output voltage is 24V the maximum available current ISLA As the output voltage decreases the voltage between the input and output of the regulator increases and excess heat is generated If output current were maintained at maxium levels thermal shut down of the linear regulator could occur With lower output voltages output loading must be reduced As the output voltage drops below 5V the current should be limited to 5A The Positive Supply Vs does not have the same limitations as the Negative Power Supply Vs because it is a switching regulator
29. de for Positive Vs and Negative Vs Power Supply Recalls data setting from program memory SOURCE Key Selects internal or external control signal for sweep burst and modulation functions Also accesses program memory SWEEP Key Selects linear or logarithm frequency sweeping modes BURST Key Selects Single or Multiple burst for the output signal MOD Key Select Frequency modulation or Amplitude modulation mode SET Key Turns ON OFF the back light of the LCD display as the function generator is set into Sweep Burst or Modulation function mode this key provides the capability to strobe each step and quantity during set up process Also stores current setting to program memory RNG UP Key Increase the output frequency by a decade RNG DN Key Decreases output frequency by a decade WAVEFORM Key Selects output signal Sine Square or Triangle Digital Encoder Adjusts up to 18 different quantities displayed by bar graphic for each desired function Amplitude Pot Adjusts the amplitude of the output signal SYM Key Enables the Duty Cycle adjustment function OFFSET Key Enables the DC Offset adjustment function Also steps backwards while in multi function sequence mode LOGIC Key Selects the Logic signal output and the threshold level of the logic probe triggering level of the counter and logic power supply into TTL 5 V 3 3 V or CMOS logic Vs Variable positive supply output
30. der the SWEEP key and INT under the SOURCE key e To toggle between linear LIN and logarithmic LOG modes press the SWEEP key e To toggle between Internal INT or External EXT control signal source press the SOURCE key Note During the Sweep operation or after Sweep mode is selected some key switches are disabled To abort the function and return to Basic Function Generator mode press the SWEEP or ADJUST key The frequency variation pace is determined by the initial selection of LINEAR or LOGARITHMIC If the sweep mode frequency range or frequency points need adjustment press the SET key to stop the sweep operation and return to the original set up procedure to modify the operation as desired If the start frequency selected is lower than the stop frequency the frequency sweep is increased from low to high otherwise the frequency sweep is decreased from high to low To perform a Sweep operation using internal control signal source e Make sure the signal source is set to INT Press the SOURCE button to toggle OPERATION e Press the SET key to strobe the selection e The START message will blink to prompt for a desired starting frequency e Adjust the encoder the ranging keys and then press the SET key again to strobe the starting point e When the STOP sign flashes turn the encoder to select the ending frequency e Press the SET key to strobe the selection e The Sweep
31. e adjusted either by steps or by the minimum amount The numerical keys on the computer keyboard represent the percentage of bar graph adjustments within the whole range 0 0 1 10 2 20 3 30 4 40 5 50 6 60 7 70 8 80 9 90 100 Full Range The user adjusts the quantity by entering the appropriate numerical number in a stepwise increasing or decreasing pattern and then presses the ENTER key Page 35 OPERATION to view the response Highly specific numbers can also be obtained by pressing the or keys on the keyboard to increment or decrease by the minimum adjustment 3 10 FACTORY DEFAULT SETTINGS When the reset key is pressed and held down the ten storage slots are cleared and the active settings default back to the original factory settings listed below Frequency Range 20K Waveform Sine Wave Coarse or Fine Frequency Adjust Bar graph in the Mid Range DC Offset O mid range Duty Cycle 50 mid range Logic TTL 5 V controls logic probe threshold Logic signal and power supply Vcc outputs Counter Triggering Voltage Mid Range Vs 12 V Mid Range TRACKING Off Vs 12 V Mid Range C LEVEL 5 V Source INT Internal SWEEP LIN Linear Start Frequency Maximum Setting Stop Frequency Minimum Setting TIME Mid Range BURST Single MOD FM FM Mid Range Page 36 3 11 INPUT AND OUTPUT PROTECTION Excessive voltage present at the input or output of
32. eaches a designated level a heat sensing cooling fan activates Fan speed will increase or decrease in response to the inside temperature Prior to the fan coming on it s normal to hear a low whistling noise coming from the machine On the MODEL 4050 machine the fan is powered by a constant DC voltage instead of a heat sensing circuit Page 15 FUNCTIONS Page 16 SECTION THREE OPERATION 3 1 THEORY OF OPERATION The MODEL 4051 programmable multifunction Generator is a versatile signal source combining four common lab instruments into one low cost user friendly and highly portable unit The heart of the function generator is a VCG Voltage Controlled Generator that produces precision sine square or triangle waves over the 0 2 Hz to 20 MHz range A built in auto ranging frequency counter displays the output frequency of the generator or external signals from the counter input or logic probe Coarse and fine frequency tuning controls permit precision setting of the output frequency which is then locked within 0 2 by the auto frequency locking function to eliminate drift caused by temperature moisture or component degeneration A continuously variable DC offset allows the output to be injected directly into circuits at the correct bias level and the variable duty cycle of the output signal converts the instrument to a pulse generator capable of generating rectangular waves or positive or negative going pulses OPERATIO
33. ed Positive and Negative Adjustments Dual Tracking 1 Press the FUNCTION key until the display shows either Vs or Vs and the previously set voltage 2 Press the CAL key 3 The TRACKING sign will be displayed and the negative polarity will instantly track to the positive polarity When TRACKING mode is activated any adjustments made to the positive Vs or negative Vs polarity will change the positive Vs polarity and track the negative Vs polarity to match it 4 Press the CAL key again to turn off TRACKING If no adjustments were made to the voltage quantity while TRACKING mode was on the negative Vs polarity will be restored to its pre tracking value If any voltage value adjustments were made during TRACKING mode by turning the digital encoder both the positive Vs and negative Vs polarity values will remain at their adjusted tracked values 4 9 CMOS OUTPUT LEVEL C LEVEL AND ADJUSTMENT The default C level output value is set to 5 V Fora CMOS circuit with Vdd supply voltage other than 5 V adjust the C LEVEL until it s equal or close to the supply voltage This will allow the CMOS output signal and the threshold of the logic probe to accommodate the circuit under test 1 Press the FUNCTION key until the display shows C LEVEL with the previous setting voltage 2 Turn the encoder clockwise to increase the voltage and counterclo
34. encoder to adjust the stop frequency Page 39 OPERATING STEPS amp TROUBLESHOOTING 6 Press SET key 7 The Sweeping operation is present at the output Turn the encoder to adjust the sweeping speed 8 Press SET key to stop the operation and return to step 2 Press SWEEP key or ADJUST key to abort the sweeping operation B Logarithm LOG Sweeping with Internal INT Control Source 1 Press the SWEEP key twice 2 Remaining steps are identical to the steps given for linear sweeping from step 2 to step 8 C Frequency Sweeping with External EXT Control Source 1 Press SWEEP key 2 Press SOURCE key to switch to external control source Sweep mode options LIN or LOG will become disabled 3 Press SET key When EXT and COARSE FREQ flashes on the display turn the encoder to adjust the max starting frequency 4 Apply positive stepping or ramping signals to the VCG MOD input jack At the starting max frequency the applied signal must be 10 0 V or lower As the frequency decreases the max allowed voltage also decreases Page 40 the output frequency decreases as the voltage rises over 10 2 V and the output signal will stop oscillating or will generate an invalid signal the frequency variation speed depends on the frequency of the input signal 5 Press the SET key to stop the operation and return to step 2 Press the SWEEP key or the ADJUST key to abort t
35. eously analyze and measure circuit activity This compact device combines the functionality of five standard laboratory instruments into one integrated unit making the task of switching instruments as easy as pressing a button FEATURES Autoranging frequency and low frequency counter covers the measurement range from 0 04 Hz to 35 MHz with fixed TTL CMOS logic threshold or variable triggering level GENERAL INFORMATION Totalize counter counts up to 999999 counts 35 MHz universal logic probe for TTL logic and CMOS logic from 3 V to 16 V display all the logic states with six different unique formats 4 digit auto ranging DC Voltmeter covers the range 0 250 Triple outputs Power Supply 1 5 V 3 3 V logic supply with 5 A output current 2 Vs variable 0 to 24 V with 1 5 A output current 3 Vs variable 0 to 24 V with 1 5 A output current Vs and Vs supply can be separated or dual tracking adjusted and each supply has short circuit over current and over temperature protection Digital display monitors each supply voltage while the supply is being adjusted Memory Backup for previous settings allowing this unit to work similar to a conventional mechanical switch operated instrument All Page 5 GENERAL INFORMATION Page 6 modes settings and quantity adjustments in use are memorized and can be restored immediately after power up LCD Back light display high brightness uniform cold cath
36. erating systems should be similar 1 Use the DB9 Male to Female Serial Cable for straight through connections 2 Connect the male side of the DB9 cable to the MODEL 4051 and the female side to the COM1 port of the PC If COM1 is in use plug it into the COM2 port Page 45 OPERATING STEPS amp TROUBLESHOOTING Ja Page 46 From a Windows PC launch the Hyperterminal program or an equivalent terminal program Change the Hyperterminal program s settings to connect directly to the COM port the cable was plugged into Connect using the following parameters Bits per second 9600 Data bits 8 Parity None Stop bit 1 Flow control Xon Xoff Click OK to exit to the next window The chosen ICON name will show on the screen Once the ICON name has been set up just double click it on the communication window Make sure all cable connections are secure to the computer and the MODEL 4051 then turn on the 4051 Press the ENTER key on the computer keyboard If the remote interface set up was successful you should the information in figure 4 1 on the computer monitor screen To operate the 4051 through the remote interface please see section 3 8 for detailed instructions FB KE K K OK K OK K K K K K K K K OK K K OK K K K OK K OK K K K K K K K K OK K K K K K K K OK K OK K K K K K K K K EK K OK K K OK K K K K K K K OK K OK K K K K K K K K K K K RNG UP gt U RNG DN gt D OFFSET gt O
37. ey TTL V and TTL 3 3 V have the same logic threshold The CMOS threshold is controlled by the C LEVEL Refer to 3 6 5 C LEVEL control e Adjust the C LEVEL until the voltage is equal to the Vpp of the circuit to be measured For measuring the frequency with a large swing in amplitude the TTL or CMOS logic threshold can also be selected as the triggering level To measuring an AC signal with a DC bias or a signal with small amplitude swing e Make sure the signal is connected to the EXT COUNTER input jack on the front panel e Press LOGIC key until VOLTAGE SETTING displays e Turn the digital encoder clockwise until the bar graph is at max e Adjust the encoder in a counterclockwise direction to reduce the triggering level until the first reading is shown For a stable measurement continue reducing the bar graph to the middle point of the remaining bar graph e This auto ranging frequency counter can measure the signal from 3 Hz to 35 MHz with a fixed logic threshold as a triggering point OPERATION or a variable triggering level e For frequencies less than 3 Hz the display will flash with 0 00 Hz indicating that the under range is detected and the user must change to low frequency counter for lower frequency measurement Upon entering frequency counter mode all the waveform generator functions of the MODEL 4051 are disabled but the functions of the triple output power supply and logic probe are sti
38. g AC to DC converter which supplies all the power to the MODEL 4051 has a maximum OPERATION output power of 120 W If the total power exceeds this limit the switching power supply will be turned off automatically To restore power turn off the power switch wait for a few seconds and then turn the power switch back on again 3 12 ONE STEP OUTPUT AMPLITUDE CONTROL In addition to the output amplitude control available through the Amplitude Potential knob the 4051 also features a one step output amplitude control that will decrease or increase the output amplitude by 20 dB When the 4051 is not in multifunction sequence mode one step 20 dB output amplitude control can be accessed by pressing the CAL key Pressing the CAL key the first time will decrease the output signal by 20 dB and the CAL sign will appear on the LED screen to indicate that the one step output amplitude control function is active Pressing the CAL key again will increase the output signal by 20 dB While in function generator mode pressing the CAL key will first reset the duty cycle to 50 and the DC offset to zero if they are not already neutral Page 37 OPERATION Subsequent key presses of the CAL key will adjust the output signal down or up by 20 dB Adjustments made using the one step amplitude control function can be fine tuned by turning the amplitude potential knob 3 13 LOGIC PROBE OPERATION The furnishe
39. he SOURCE key to toggle e Press the SET key The AF sign will flash indicating that the output signal is being frequency modulated by the internal 1 KHz sine wave signal e Turning the encoder will vary the amount of deviation e Pressing the SET key again will terminate the modulation operation and return the user to the original starting point e Pressing the MOD key will change the operation to AM amplitude modulation OPERATION e Push the SET key to strobe the selection The sign will flash and the output signal will be amplitude modulated by the internal 1 KHz signal reducing the output signal s amplitude e Turn the encoder clockwise to increase the percent of modulation counterclockwise to decrease it To perform the Modulation operation using an External Source e Make sure an External EXT modulating signal is selected Press the SOURCE key to toggle e Make sure a suitable external modulating signal is connected to the VCG MOD input jack e The output signal will be frequency modulated or amplitude modulated by this input signal depending on the selection of the MOD key in FM or AM The encoder can adjust the degree of the modulation as described above During the Modulation operation or after Modulation mode is selected some key switches are disabled To abort the function and return to Basic Function Generator mode press the MOD key or ADJUST key
40. he operation 4 4 OUTPUT SIGNAL BURST OPERATION Press the ADJUST key to return to basic function generator mode A SINGLE burst with Internal INT Control Source 1 Press the BURST key 2 Press the SET key A single burst signal will be present at the output Turn the encoder and adjust the burst TIME to maxium Each pulse can be generated manually by pressing the SOURCE key 3 Press SET key to stop the operation and return to step 2 Press BURST key or ADJUST key to abort the operation B Multiple MULTP Burst with Internal INT Control Signal 1 Zi Press the BURST key twice Press the SET key multiple bursts of the signal will be present at the output turn the encoder to adjust the number of pulses in a burst burst width Press the SET key to stop the operation and return to step 2 Press the BURST key or the ADJUST key at any time to abort the operation C SINGLE Burst with External EXT Control Signal Source a 2 3 Press the BURST key Press the SOURCE key Press the SET key A single signal burst will be fired triggering on the negative going edge of the control signal connected to the BURST BNC input jack Press the SET key to stop the operation and return to step 3 Press the BURST key or ADJUST key to abort the operation at any time OPERAT
41. ion 4 Press the SET key to stop the operation and return to step 2 Press the MOD key or ADJUST key to abort the operation at any time C Frequency Modulate FM the Output Signal with External EXT Signal Source 1 Press the MOD key 2 Press the SOURCE key Page 42 3 Press the SET key 4 The output signal is frequency modulated by the external signal connected to the VCG MOD BNC input jack Turn the encoder to adjust the degree of frequency deviation 5 Press the SET key to stop the operation and return to step 3 Press the MOD or ADJUST key to abort the operation at any time D Amplitude Modulate AM the Output Signal with External EXT Signal Source 1 2 Press the MOD key twice Press the SOURCE key Press the SET key The output signal is amplitude modulated by the external signal connected to the VCG MOD BNC input jack Turn the encoder to adjust the percentage of amplitude modulation Press the SET key to stop the operation and return to step 3 Press the MOD or ADJUST key to abort the operation at any time 4 6 FREQUENCY COUNTER LOW FREQUENCY COUNTER AND TOTALIZE COUNTER OPERATION The frequency counter measures signal from 3 Hz to 35 MHz The low frequency counter measures signal from 0 04 Hz to 3 Hz and the Totalize counter counts the transition of the signal During
42. isappear As the main generator output waveform is a square wave changing the duty cycle of the generator will convert it into rectangular waves or pulses For a triangle wave the result is a ramp or saw tooth waveform For a sine wave a distorted wave shape called a slewed sine is produced The MODEL 4051 provides for symmetry variation from 15 to 85 The TTL CMOS logic output has the same variation rate when the waveform key is set for a square wave Varying the duty cycle will result in a slight change in frequency which can be corrected by adjusting the coarse or fine frequency controls Pulse Square Ramp Triangle Slewed Sine FIGURE 3 2 Effect of Symmetry Variation OPERATION 3 2 7 DC OFFSET CONTROL A DC component can be added to the output signal by pushing the OFFSET key When DC Offset Control is activated the message DC OFFSET is flashed on the screen The offset component is adjusted using the digital encoder Positive adjustments are made by turning the encoder counterclockwise resulting ina message and negative adjustments are made by turning the encoder clockwise resulting in a message as long as the generator outputs the signal Pressing the CAL key will restore the DC Offset to zero and no sign will display The DC component introduced can be varied by 10 V as output in an open circuit or 5 V to a 50 OHM load termination when the amplitude
43. ll available e The logic probe will be disabled once variable voltage setting mode is selected 3 6 2 LOW FREQUENCY COUNTER OPERATION When the MODEL 4051 is set to frequency counter EXT CNTR mode pressing the FUNCTION key produces the EXT CNTR TOTAL message and 0 00 Hz on the LCD The low frequency counter acts like a timer and is able to measure slower events from 0 04 Hz to 3 Hz Input to the low frequency counter must be made through the logic probe and not from the EXT COUNTER input jack Selecting the appropriate triggering level and input port for the low frequency counter operation is identical to the procedure described in section 3 6 1 For a signal with frequency Page 29 OPERATION over 3 Hz the display will flash with 3 00 Hz indicating an over range detection It will be necessary to shift back to frequency counter EXT CNTR mode for measurement of higher frequencies by pressing the OFFSET key Since the low frequency counter is designed to measure slow events it will take longer before its readings are displayed on the LCD Signals below 0 04 Hz are not measured and the display will remain unchanged at 0 00 Hz During low frequency counter operations the previous measurement reading will be cleared only as the next event cycle is detected The reading will not automatically reset to 0 00 Hz like it does during the frequency counter operation The display can be manually reset to 0
44. ltage fails to change the amplitude of the CMOS output signal in an external scope Make sure that CMOS mode is selected If TTL 5 V or TTL 3 3 V mode is selected press the LOGIC key until CMOS mode is displayed PROBLEM When the power is turned ON the display lights up for a very short time then turns off Turn off the machine and remove all loads that are connected to the triple output supply Turn the power back on If the problem still exists there may be a short inside the circuit board or a connector may be improperly connected PROBLEM When the power is turned OFF and then quickly turned ON again the LED power light is on but the display remains off Turn off the machine and leave it off for a few seconds before turning it on again The switching power supply of the MODEL 4051 requires more time to discharge when no load is connected Page 48 PROBLEM The mode is stuck on Low Frequency Counter Mode EXT CNTR TOTAL after the FUNCTION Key is pressed and all the keys are disabled There may be an external signal connected to the EXT COUNTER Input Jack or the Logic Probe tip causing a continuous interrupt to the machine Disconnect both of these inputs and press the FUNCTION key again PROBLEM When adjusting the frequency using the digital encoder the frequency changes in incremental values This is normal behavior The MODEL 4051 employs an 8 bit digital to analog con
45. ltage level must be adjusted to be equal or come close to the Vdd of the circuit under test OPERATING STEPS amp TROUBLESHOOTING PROBLEM The LCD Screen and the LED Power light fails to light up when the power switch is flipped to the ON position Check the AC power cord and make sure that it is securely connected to the AC power plug on the MODEL 4051 Check the fuse in the compartment of the AC receptacle PROBLEM There is no output signal from the main and TTL CMOS output ports Check the MODEL 4051 to see if it is in Low Frequency Counter Frequency Counter or Totalize Counter mode When the 4051 is in one of the counter modes the output signal to the TTL CMOS and main output is disabled as a result of circuit sharing PROBLEM The power supply voltage drops as loading is added to it Each power supply has a maximum output current limit If loading exceeding it s maximum output is added to it the supplied voltage will drop Please see the technical specifications for maximum output current values PROBLEM The output frequency of the generator appears to drift The automatic frequency locking functionality is only active when the MODEL 4051 is set to Coarse Frequency or Fine Frequency adjustment mode During adjustments Page 47 OPERATING STEPS amp TROUBLESHOOTING in DUTY CYCLE DC OFFSET or Voltage Adjustment mode frequency drift may occur PROBLEM Adjustments to the C LEVEL vo
46. nce the Negative Power Supply adjustment is set in this operation it will remain set while other functions are accessed To change the Vs value the Negative Power Supply Adjustment operation must be accessed again by stepping into it while in multifunction mode OPERATION 3 6 8 LOGIC POWER SUPPLY Vcc CONTROL 3 7 TTL CMOS LOGIC CONTROL OPERATION Pressing the FUNCTION key from the Negative Power The LOGIC key is used to select the signal output at the Supply Vs Adjustment Operation will step into the TTL CMOS output jack the threshold level of the logic Logic Power Supply Vcc Control operation which is probe triggering level of the counter and the logic power indicated with the message Vcc and 5 0 V or 3 3 V supply depending upon the LOGIC key setting displaying on the LCD The 5 0 V value is selected when the LOGIC For injecting the signal connect the logic power supply to the external TTL circuit and then press the LOGIC key to select TTL mode of 5 0 V or 3 3 V depending on external circuit key is set to TTL 5 V mode or when CMOS is selected The 3 3 V value is selected when the LOGIC key is set to TTL 3 3 V mode The TTL 5 V and 3 3 V operations have the same fixed logic threshold Setting the TTL mode to the correct level 5 V or 3 3 V will allow the Note Changing the logic power supply mode while power is being logic probe to function properly for either type of circuit applied to the circuit u
47. nder test may result in permanent damage to l l the circuit Do not change the logic power supply mode while the The threshold of the CMOS logic varies as its supply voltage changes circuit is being powered by the MODEL 4051 To address this adjust the CMOS logic voltage equal or close to the external CMOS circuit s supply voltage and press the LOGIC key to toggle the mode to CMOS before injecting the signal or probing the The Logic Power Supply Vcc Control Operation is logic probe into the circuit the last step in the multifunction operation sequence Pressing the FUNCTION key will cycle the user back In order to use the logic probe to measure the frequency of a large amplitude signal the appropriate logic threshold TTL or CMOS must to the first step of the sequence and return to Basic ee Function Generator mode Page 33 OPERATION 3 8 PROGRAM MEMORY OPERATION The memory backup feature allows the MODEL 4051 to work similar to a conventional mechanical switch operated instrument All previous modes settings and quantity adjustments are restored immediately after power up The MODEL 4051 also features data memory which stores up to ten different files that can be retrieved with the press of a key Memory storage or retrieval operations can only be performed from the Basic Function Generator mode which can be accessed at any time by pressing the ADJUST key 3 8 1 PROGRAM MEMORY STORAGE OPERATION All adju
48. ode fluorescent lamp back lighting provides a high contrast display easily readable from multiple angles even from a distance Sweep function generator covering the frequency range of 0 14 Hz to 20 MHz with large 6 digit display Coarse and Fine adjustments DC offset and Duty cycle controls Wave form provided with Sine Triangle Square Saw tooth Ramp Pulse With operating modes of Normal Sweep linear or logarithm Burst single or multiple Modulation FM or AM VCG Output amplitude range of 20mV to 20 Vp p TTL CMOS logic output CMOS output level can be adjusted from 3 0 V to 16 0 V The TTL signal can be switched between 5 V or 3 3 V output it has the same frequency as the main generator User friendly key switch operation As function keys are pressed corresponding functions and previous settings are retrieved and the previous adjusted quantity displays on the LCD bar graph The digital encoder can adjust and memorize up to 18 active quantities allow users to switch between functions without losing already made adjustments Auto frequency locking capability unlike conventional function generators the output frequency of the MODEL 4051 can be automatically locked within 0 2 range at the tuned frequency without drift caused by temperature moisture or component degeneration One time set up program memory provides data memory which can store up to ten different files and can be retrieved with a single keys
49. on which adjusts the symmetry of the main output signal and TTL CMOS signal The arrow signs on the display 4 or gt indicates the adjusted direction For a signal with a duty cycle other than 50 one of the arrows will be displayed constantly 2 2 11 OFFSET KEY This key enables DC offset adjustment of the main output signal The positive and negative signs on the display indicates the direction of the DC offset As long as an offset exists a sign will be displayed Secondary function In multifunction sequence mode this key serves as the backward key FUNCTIONS 2 2 12 LOGIC KEY Selects the logic signal for TTL 5 V TTL 3 3 V or CMOS Logic at the TTL CMOS output Jack the logic threshold levels of the logic probe the triggering levels of the counters and the logic power supply Vcc outputs 2 2 13 ADJUST KEY Pressing this key at any time will abort other functions and enter into function generator coarse frequency adjustment mode This key can then toggle between coarse and fine frequency adjustments The type of quantity being adjusted is indicated by the blinking sign displayed above the ADJUST key 2 2 14 FUNCTION KEY Controls functions and displays for operations outside of the function generator Press to start the multifunction sequence mode Upon entering this multifunction sequence each additional press of the FUNCTION key advances forward one step in the seq
50. output signals and three for input signals e 2 4 1 50 OHM MAIN OUTPUT Used for main function generator output with superimposed DC offset and Duty cycle adjustment e 2 4 2 TTL CMOS OUTPUT Provides TTL 5 V TTL 3 3 V or CMOS square waves When the selected output waveform is the square waveform it has the same frequency and duty cycle as the main output but is independent of output level control from the Amplitude Pot and DC offset controls e 2 4 3 EXT COUNTER INPUT Used for measuring the frequency 3 Hz to 35 MHz of a small amplitude signal or a signal with DC bias This input jack accepts AC coupling only and the input signal must be greater than 3Hz e 2 4 4 VCG MOD INPUT Used for external control signal input for Sweep or modulation operations when the SOURCE key is toggled to EXT In Sweep operations this jack is used for Voltage Control Generator VCG Input A higher positive voltage will decrease the generator output frequency In Modulation operations this jack is used for modulation input source e 2 4 5 BURST INPUT Used to input an external gating signal for Burst operations The user is able to apply a TTL logic signal with proper width through this port when connected to an external EXT source 2 5 LOGIC DVM PROBE JACK Used to connect the furnished logic probe for voltage and frequency measurement 0 04 Hz to 35 MHz and logic circuit activity analysis 2 6 TRIPLE OUTPUT DC POWER SUPPLY JACK On the MODEL
51. rt a paper clip or pin through the RESET pin hole and push down until the display resets 2 8 POWER ON OFF SWITCH The power switch is located on the lower left corner of the panel with a red LED as the power indicator 2 9 LCD 5 x1 5 Liquid Crystal Display with CCFL back light In the display center there is a 6 digit indicator used to show e output signal for the function generator incoming signal for the counter e voltage measurement displays for the Digital Voltmeter DVM e settings for the triple output DC power supply Page 14 System messages are displayed around the four edges of the LCD near its corresponding function key Displayed system messages identify the current operation and settings When adjustments are made using the Digital Encoder blinking signs indicate the settings being affected 2 10 RS 232C SERIAL PORT A DB9 sub female connector is located on the back panel to allow the user to connect the unit to a computer for remote monitoring e control of sensors or activators in corrective or analytical applications This connector connects pin 2 to TXD pin 3 to RXD pin5 to ground and is set at 9600bps 1 stop 8 bit no parity mode FUNCTIONS 2 11 VCG OUTPUT The BNC Jack on the back panel is used for voltage controlled generator output The output voltage is proportional to the generator frequency 2 12 HEAT ACTIVATED COOLING FAN When the ambient temperature inside the unit r
52. rument restoring previous modes settings and quantity adjustments from previous use Up to ten different data sets can be stored to memory allowing for quick changes between different testing specifications for different testing needs A built in RS232C serial port to the computer enables the user to perform remote monitoring control of sensors or control of actuators in corrective or analytical applications The MODEL 4051 is a versatile instrument capable of providing a variety of output waveform and functions To gain a working familiarity with the unit it is recommended that it be connected initially to an oscilloscope so that the effects of the various controls on the output waveform can be observed Page 18 3 2 BASIC FUNCTION GENERATOR OPERATION Pressing the ADJUST key at any time during function operation will abort from other functions and enter the Basic Function Generator mode In this mode frequency and frequency range will be displayed on the LCD screen As the digital encoder is turned the active quantity being adjusted will be identified by a blinking sign 3 2 1 COARSE FREQUENCY ADJUSTMENT Pressing the ADJUST key at any time will abort any active operations and enter into the Basic Function Generator in Coarse Frequency Adjustment mode and the COARSE FREQ sign will blink on the LCD screen to indicate the current mode Turning the digital encoder clockwise will increase the frequency and turning it
53. s appear to indicate the active operation FUNCTIONS Function Key Buttons CAL SOURCE SWEEP BURST MOD SET RNG UP RNG DN WAVEFORM SYM OFFSET LOGIC FUNCTION ADJUST 2 2 1 CAL KEY While the MODEL 4051 is set in function generator mode the CAL key can reset the 50 OHM output signal to 50 duty and the DC offset to zero Operating in the Positive VS or Negative VS power supply adjustment mode this key enables or inhibits the Tracking adjustment mode for both power supplies The CAL key also restores saved settings from program memory 2 2 2 SOURCE KEY The control signal for Sweep Burst and Modulation operations of the function generator can be selected either from an Internal INT or External EXT source The SOURCE key toggles between sources for the control signal when pressed By default functions are set to INT mode The Source key also serves as the entry key to Program memory either for memory storage or memory recall operations In SINGLE BURST mode the SOURCE key is used to fire a single pulse manually when TIME is set to the maximum quantity Page 9 FUNCTIONS 2 2 3 SWEEP KEY The frequency sweeping function can be selected either in Linear LIN or Logarithm LOG mode Pressing the SWEEP key can toggle between these two operations By default the Sweep function is set to LIN mode 2 2 4 BURST KEY The output signal from the 50 OHM BNC Jack can be con
54. selected waveform and then adjust the frequency amplitude symmetry and the DC offset of the signal as needed e Press the SET key WIDTH will blink on the LCD Screen e Turn the Digital Encoder to adjust the number of pulses in each burst The burst width can be continuously variable from 5 to 90 of internal gating frequency To perform Burst operation using an Internal INT trigger source in Single Burst mode e Make sure an Internal INT source is selected e Press the SET key to stop the burst operation and return to set up and make any modifications as needed e Press the BURST key to select SINGLE burst mode operation e Press the SET key The TIME message will blink and a single To perform Burst operations using an External EXT trigger source shot of pulse is present at the output jack The output signal in burst operation is triggered at the middle point of the rising edge e Make sure an External EXT trigger source is selected Press the regardless of whether the MODEL 4051 is operating in single SOURCE key to toggle or multiple burst mode The output signal burst is always a full cycle increment or decrement e Connect an external logic control signal to the BURST BNC input jack The output signal will be triggered at the negative e To adjust the time in between each single burst turn the digital going edge of the external signal in a single or multiple bursts encoder When the TIME bar graph is se
55. stments and values used in the MODEL 40515 many operations can be saved to memory and retrieved for future use The MODEL 4051 has room for eleven stored files one for storage of active data from current operations and ten for permanent storage To store all current values and adjustments to a file press the SOURCE key while in Basic Function Generator mode The display will change to show P 01 and with each key press the number Page 34 increments up to P 10 These are storage slots for data files Slots that are already used will be marked with a CAL sign when its number is displayed Unused slots do not show the CAL sign The user can save current values to any slot by pressing the SET key Saving data sets to an occupied data slot will result in the loss of the data in the slot as the current data overwrites the previously stored data 3 8 2 PROGRAM MEMORY RETRIEVAL Files stored using the Program Memory Storage Operation can be retrieved from the Basic Function Generator mode by pressing the SOURCE key until the desired data set is reached To retrieve the data set press the CAL key The stored values and settings will be loaded into active memory and all subsequent adjustments in operations will be performed from the retrieved values and modes To terminate a memory program operation and return to basic function mode press the ADJUST key 3 9 COMPUTER REMOTE CONTROL OPERATION The RS 232C serial port
56. surement with AC coupling only Burst Input Input external gating signal for Burst operation VCG MOD Input Input external control signal for Sweep or Modulation operation RS 232C Serial Port Connects to computer for remote operation GCV Output Generator Control Voltage output Voltage proportional to generator frequency Cooling Fan The MODEL 4051 s temperature sensitive cooling system responds as internal heat levels rise On the 4050 the cooling fan operates continuously after the unit is turned on Page 53 Service Information Warranty Service Please return the product in the original packaging with proof of purchase to the below address Clearly state in writing the performance problem and return any leads probe and accessories that you are using with the service Non Warranty Service Please return the product in the original packaging to the below address Clearly state in writing the performance problem and return any leads probe and accessories that you are using with the device Customers not on an open account must include payment in the form of a money order or credit card For the most current repair charges contact the factory before shipping the product Return all merchandise to BK Precision with pre paid shipping The flat rate repair inclujdes return shipping to locations in North America For overnight shipments and non North America shipping fees contact BK Precision B K Precision Corporation 22820 Savi Ranch
57. t all the way to the right depending on the Burst setting at max automatic single burst generation is disabled and each single shot must be fired manually by pressing the SOURCE key Note Width and Time settings are not available when using an external source since the Burst width and time intervals are fully controlled by the external source Page 25 OPERATION Burst Burst Width Time TRIANGLE Figure 3 6 Multiple Burst Figure 3 5 Single Burst Key Pulse 3 3 MODULATION OPERATION The output signal of the MODEL 4051 can be either frequency modulated or amplitude modulated by the internal 1 KHz sine wave signal or it can be modulated by an external signal applied through the VCG MOD input jack Pressing the MOD key during Basic Function Generator mode activates Page 26 the Modulation operation and the LCD will show FM under the MOD key and INT under the SOURCE key to indicate the default modes of the Modulation operation Press the MOD key to toggle between frequency modulation FM and amplitude modulation AM Press the SOURCE key to toggle between an Internal INT or External EXT output signal source Before entering the modulation operation select the waveform and adjust the frequency amplitude duty cycle and DC offset of the output signal as described above To perform the Modulation operation using an Internal Source e Make sure an Internal INT output signal source is selected Press t
58. the operation of these three counters the function generator is disabled as a result of having no output signal at the TTL CMOS and main generator output due to circuit sharing A Measuring the logic signal or a signal with large swing in amplitude 1 Plug the logic probe into the LOGIC DVM socket 2 Press the FUNCTION key once for the frequency counter EXT CNTR Press twice for the low frequency counter EXT CNTR TOTAL Press three times for the Totalize counter TOTAL 3 Press LOGIC key to select the appropriate logic threshold for the triggering voltage of the counter 4 Probe the signal source with the tip of the logic probe the measurement result will display on the LCD screen 5 The low frequency counter measures slower events and needs more time to complete a cycle The previous result 4 7 OPERATING STEPS amp TROUBLESHOOTING will be cleared at the triggering edge of the next event or manually by pressing the CAL key 6 When operating the Totalize Counter the CAL key needs to be pressed to clear the display before the next measurement can be taken B Measure the AC signal with a DC bias or a Signal with small Amplitude swing 1 Connect the signal to the EXT COUNTER BNC input jack 2 Press the FUNCTION key to select one of the Counter functions 3 Press the LOGIC key until the display shows VOLTAGE SETTING 4 Turn the encoder to adjust the
59. triggering voltage level of the counter until a stable reading is reached MULTI FUNCTION SIMULTANEOUS OPERATION 1 Adjust the Duty Cycle and DC Offset of the generator as needed 2 Press the FUNCTION key to adjust the voltage of the power supply Vs and Vs for the circuit being tested 3 Press the LOGIC key to select the appropriate logic family Page 43 OPERATING STEPS amp TROUBLESHOOTING for the circuit and the logic probe 4 Press the OFFSET key to back step to DVM mode 5 The logic probe can now analyze circuit activity The LCD screen shows the voltage reading of the test probe being probed The triple output power supply maintains the preset output voltage The waveform generator is still available to the user for making changes to the frequency range waveform and coarse frequency 4 8 POSITIVE AND NEGATIVE Vs amp Vs POWER SUPPLY ADJUSTMENT A Separate Positive and Negative Adjustments 1 Press the FUNCTION key until display shows Vs 2 Adjust the positive voltage by turning the encoder clockwise to increase the voltage and turning it counterclockwise to decrease the voltage until the desired output voltage is displayed on the LCD 3 Press the FUNCTION key again The display should show Vs to indicate negative voltage adjustment mode Page 44 4 Adjust the negative voltage using the digital encoder as in step 2 B Synchroniz
60. troke RS232 interface port enables network connectivity by a computer to perform remote monitoring or control of sensors or actuators in corrective or analysis applications 1 3 UNPACKING AND INSPECTION The MODEL 4051 multi task lab instrument was carefully tested and inspected both mechanically as well as electronically prior to shipment Upon receiving the instrument carefully unpack all items from the shipping cartons and inspect them for any obvious signs of physical damage that may have occurred during delivery Report any such damage to transit agent immediately Save both the packing box and foam blocks for future use in case re shipment is required After unpacking the system check for the following included items e One programmable multifunction generator e One logic probe e One BNC cable e One Power Cord e One Operating Manual INSTRUMENT IDENTIFICATION Each BK Precision instrument has an eight character serial number e g 04120015 The first two digits 1 5 GENERAL INFORMATION identify year of manufacturing the second two digits identify the month and the last four digits refer to the manufactured run quantity INSTRUMENT POWER AND CARE The AC power is internally set for 120 V or 220 VAC by a jumper The power setting is marked clearly on the back panel Be sure to check the back panel before connecting the line voltage The line voltage must be within 10 of the setting voltage Line frequency m
61. trolled as a single SINGLE PULSE Burst or a multiple MULTP Burst of a pulse train Pressing this key can toggle between these two types of operations By default the Burst function is set to SINGLE mode 2 2 5 MOD KEY The main generator output can be modulated by an internal signal a standard 1 KHz sine wave or an external signal from the VCG MOD BNC Jack Pressing this key selects between frequency modulation FM or Amplitude modulation AM By default the modulation function is set to FM Page 10 2 2 6 SET KEY Under normal operation the SET key turns the back light of the LCD display on or off When the function generator is set to perform a Sweep Burst or Modulation operation this key allows the user to strobe each step and adjust quantity during set up This key also allows the user to store current settings to program memory 2 2 7 RNG UP KEY Pressing this key can increase the output frequency by a decade until the range reaches 20 MHz The current range is displayed by the side of this key in a total of eight different ranges 2 2 8 RNG DN KEY Pressing this key can decrease the frequency range by a decade until the range reaches 2 Hz 2 2 9 WAVEFORM KEY Selects the waveform of the output signal Sine Square or Triangle waveform The displayed waveform by the side of this key is the current output waveform 2 2 10 SYM KEY This key enables the duty cycle functi
62. uence the OFFSET key steps backward and the ADJUST key aborts the sequence Page 11 FUNCTIONS On the MODEL 4051 the function sequence advances in the following order Function Generator gt Freq Counter EXT CNTR gt Low Freq Counter EXT CNTR TOTAL gt TOTALIZE Counter TOTAL gt Digital Voltmeter DVM gt CMOS level C LEVEL gt Positive Supply Vs gt Negative Supply Vs gt Logic Supply Vcc Note On the specially configured MODEL 4050 unit the sequence loops to the beginning after the CMOS Level function since it lacks the MODEL 4051 s triple output power supply 2 3 CONTROL KNOB There are two control knobs on the front panel one is dedicated to the signal output level control and the other is multiplexed for all other adjustments 2 3 1 DIGITAL ENCODER The digital encoder can adjust and memorize up to 18 active quantities allowing users to switch between functions without losing already made adjustments The active item being adjusted by the encoder will blink on the LCD The full range of each adjustable quantity corresponds to the twelve sections of the bar graph Page 12 2 3 2 AMPLITUDE POT Controls the amplitude of the signal at the output jack with 20Vp p into the open circuit 10Vp p into the 50 OHM Attenuation factors can be a total of 40 dB from the maximum 2 4 BNC OUTPUT AND INPUT JACKS There are five BNC jacks located on the right side of the front panel two for
63. ust be within a range of 46 Hz to 68 Hz The instrument should not be turned on and off quickly and repeatedly as loss of data saved in system memory may result Replacement fuses must be 2 A for the 120 VAC or 1 A for the 220 VAC The fuse holder is inside the AC power receptacle If the MODEL 4051 needs cleaning the rubber boot can be easily removed for cleaning purposes To reassemble the rubber boot push the four rubber tabs back into their holes with a pin or a small screwdriver Page 7 SECTION TWO FUNCTIONS 1 1 2 2 INTRODUCTION Push button key switches access all functions of the MODEL 4051 Keys may be dedicated or multiplexed with multiple function assignments As a function key is pressed a related function status message is shown on the LCD display The digital encoder can adjust and memorize the active quantity of each accessed function allowing the user to switch between functions without losing already made adjustments Output and Input connections to the MODEL 4051 are provided through BNC jacks Four banana jacks are available for use with the triple output power supply Note BK Precision also offers the MODEL 4050 a specially configured MODEL 4051 without a triple output power supply FUNCTION KEY SWITCH There are fourteen key switches around the LCD display Each key cap is printed with the name of a dedicated function or a general control name When a function key is pressed on screen message
64. verter to control the COARSE FREQ and FINE FREQ adjustments dividing each range into 256 steps of incremental values Each adjustment to the frequency will increase or decrease the frequency by the value of one step instead of a continuous numerical value SECTION FIVE SPECIFICATIONS FUNCTION GENERATOR FREQUENCY CHARACTERISTICS Wave forms Sine Square Triangle Pulse Ramp Range 0 15 Hz to 20 MHz in 8 ranges Resolution 0 01 0 1 1 10 100 Hz Display Tuning Range Coarse 10 1 Fine 3 of Coarse Setting Variable Duty Cycle 15 85 15 Continuously variable Operating Modes Normal Sweep VCG AM FM Single Burst Multiple Burst Frequency Stability 0 2 of the tuning frequency OUTPUT CHARACTERISTICS Impedance 50 ohm 10 Level 200 mV to 20V p p Open circuit 10V p p into 50 ohm to 10 MHz Amplitude Control Variable 20 dB range typical DC Offset Preset 0 10 V typical Variable 10V open circuit 5 V into 50 ohm Sine Wave Distortion lt 1 0 THD from 10 Hz to 100 KHz Flatness 3 0 3 dB 0 15 Hz to 200 KHz 5 0 45 dB 200 KHz to 10 MHz 20 2 0 dB 10 MHz to 20 MHz SPECIFICATIONS Square Wave Symmetry lt 2 0 15 Hz to 100 KHz Rise Time lt 20 ns Overshoot amp Undershoot lt 6 Triangle Wave Linearity 98 up to 100 KHz TTL OUTPUT Open Circuit Condition for Frequencies lt 2 MHz Max Logic Low Level Voltage lt 0 4 V Min Logic High Level Voltage gt 2

Operating Manual B+K PRECISION 4051 Multi

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