Related Manuals for BK Precision 4051
Summary of Contents for BK Precision 4051
- Page 1 99 Washington Street Melrose, MA 02176 Fax 781-665-0780 TestEquipmentDepot.com Operating Manual B+K PRECISION 4051 Multi-Function Generator...
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Page 2: Table Of Contents
2.2.13 - “ADJUST” KEY 2.2.14 - “FUNCTION” KEY 2.3 - CONTROL KNOB BK PRECISION MODEL 4051 2.3.1 - DIGITAL ENCODER Operating Manual 2.3.2 - AMPLITUDE POT Table of Contents 2.4 - BNC OUTPUT AND INPUT JACK 2.4.1 - 50 OHM OUTPUT 2.4.2 - TTL/CMOS OUTPUT Warranty: Inside Front Cover 2.4.3 - EXT. COUNTER INPUT 2.4.4 - VCG/MOD INPUT Section One: GENERAL INFORMATION 2.4.5 - BURST INPUT 2.5 - LOGIC/DVM PROBE JACK 1.1 - INTRODUCTION 2.6 - TRIPLE OUTPUT DC POWER SUPPLY JACK 1.2 - FEATURES 2.6.1 - +Vs JACK 1.3 - UNPACKING AND INSPECTION 2.6.2 - -Vs JACK 1.4 - INSTRUMENT IDENTIFICATION 2.6.3 - +5 V/3.3 V (VCC) JACK 1.5 - INSTRUMENT POWER AND CARE 2.6.4 - GND JACK 2.7 - RESET SWITCH Section Two: FUNCTIONS 2.8 - POWER ON/OFF SWITCH 2.9 - LCD 2.1 - INTRODUCTION 2.10 - RS-232C SERIAL PORT 2.2 - FUNCTION KEY SWITCH 2.11 - VCG OUTPUT 2.2.1 - “CAL” KEY 2.12 - HEAT ACTIVATED COOLING FAN 2.2.2 - “SOURCE” KEY 2.2.3 - “SWEEP” KEY Section Three: OPERATION 2.2.4 - “BURST” KEY... - Page 3 3.2.6 - DUTY CYCLE (SYMMETRY) CONTROL Section Four: OPERATING STEPS & TROUBLESHOOTING 3.2.7 - DC OFFSET CONTROL 3.2.8 - OUTPUT LEVEL AMPLITUDE CONTROL 4.1 - INTRODUCTION 3.3 - SWEEP OPERATION 4.2 - BASIC FUNCTION GENERATOR MODE 3.4 - BURST OPERATION 4.3 - FREQUENCY SWEEPING OPERATION 3.5 - MODULATION OPERATION 4.4 - OUTPUT SIGNAL BURST OPERATION 3.6 - MULTIPLE FUNCTION OPERATION 4.5 - OUTPUT SIGNAL MODULATION OPERATION 3.6.1 - AUTORANGING FREQUENCY (EXT. CNTR) 4.6 - FREQUENCY COUNTER, LOW FREQUENCY COUNTER OPERATION COUNTER, AND TOTALIZE COUNTER OPERATION 3.6.2 - LOW FREQUENCY COUNTER OPERATION 4.7 - MULTI-FUNCTION SIMULTANEOUS OPERATION 3.6.3 - TOTALIZE COUNTER (TOTAL) OPERATION 4.8 - POSITIVE AND NEGATIVE (+Vs & -Vs) POWER 3.6.4 - DIGITAL VOLTMETER (DVM) OPERATION SUPPLY ADJUSTMENT 3.6.5 - CMOS LOGIC OUTPUT LEVEL (C-LEVEL) 4.9 - CMOS OUTPUT LEVEL (C-LEVEL) AND ADJUSTMENT ADJUSTMENT 4.10 - PROGRAM MEMORY OPERATION 3.6.6 - POSITIVE POWER SUPPLY (+Vs) ADJUSTMENT 4.11 - RS-232C COMPUTER INTERFACE EXAMPLE 3.6.7 - NEGATIVE POWER SUPPLY (-Vs) ADJUSTMENT 4.12 - TROUBLESHOOTING GUIDE 3.6.8 - LOGIC POWER SUPPLY (Vcc) CONTROL 3.7 - TTL/CMOS LOGIC CONTROL OPERATION Section Five: SPECIFICATIONS 3.8 - PROGRAM MEMORY OPERATION 3.8.1 - PROGRAM MEMORY STORAGE OPERATION Section Six: PANEL DIAGRAMS 3.8.2 - PROGRAM MEMORY RETRIEVAL 3.9 - COMPUTER REMOTE CONTROL OPERATION 3.10 - RESTORE FACTORY DEFAULT SETTINGS 3.11 - INPUT AND OUTPUT PROTECTION 3.11.1 - BNC OUTPUT JACK 3.11.2 - BNC INPUT JACK...
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Page 4: Introduction
GENERAL INFORMATION SECTION ONE: GENERAL INFO • Totalize counter counts up to 999999 counts. • 35 MHz universal logic probe for TTL logic and 1.1 INTRODUCTION CMOS logic (from 3 V to 16 V), display all the logic states with six different unique formats. The MODEL 4051 programmable multifunction generator is an exceptionally versatile and economical • 4-digit auto-ranging DC Voltmeter covers the instrument for applications in R&D, Manufacturing range ± 0 ~ 250 V. Tests, Service Repair, and Training. Featuring an adjustable triple output power supply and waveform • Triple outputs Power Supply: generator, it has the ability to provide power and signal sources for a circuit while the universal logic 1) 5 V/3.3 V logic supply, with 5 A output current. probe, auto-ranging frequency counter, and digital voltmeter allow users to simultaneously analyze 2) +Vs variable 0 to +24 V, with 1.5 A output current. and measure circuit activity. This compact device 3) –Vs variable 0 to –24 V, with 1.5 A output current. combines the functionality of fi ve standard laboratory instruments into one integrated unit, making the task +Vs and –Vs supply can be separated or dual of switching instruments as easy as pressing a button. tracking adjusted, and each supply has short circuit, over current, and over temperature 1.2 FEATURES: protection. Digital display monitors each supply... - Page 5 The digital encoder can adjust and memorize up to 18 active quantities, allow users to switch • LCD Back-light display—high brightness, uniform between functions without losing already made cold cathode fl uorescent lamp back-lighting adjustments. provides a high contrast display easily readable from multiple angles even from a distance. • Auto frequency locking capability—unlike conventional function generators, the output • Sweep function generator covering the frequency frequency of the MODEL 4051 can be range of 0.14 Hz to 20 MHz with large 6-digit automatically locked within ±0.2% range display, Coarse and Fine adjustments, DC offset at the tuned frequency, without drift caused and Duty cycle controls, Wave form provided by temperature, moisture or component with Sine, Triangle, Square, Saw-tooth, ±Ramp, degeneration. ±Pulse. With operating modes of Normal, Sweep(linear or logarithm), Burst(single or • One time set up program memory—provides data multiple), Modulation (FM or AM), VCG. Output memory which can store up to ten different fi les amplitude range of 20mV to 20 Vp-p. TTL/CMOS and can be retrieved with a single keystroke. logic output: CMOS output level can be adjusted from 3.0 V to 16.0 V. The TTL signal can be...
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Page 6: Unpacking And Inspection
GENERAL INFORMATION 1.3 UNPACKING AND INSPECTION identify year of manufacturing, the second two digits identify the month, and the last four digits refer to the manufactured run quantity. The MODEL 4051 multi-task lab instrument was carefully tested and inspected both mechanically as well as electronically prior to shipment. Upon receiving the 1.5 INSTRUMENT POWER AND CARE instrument, carefully unpack all items from the shipping cartons and inspect them for any obvious signs of The AC power is internally set for 120 V or 220 VAC physical damage that may have occurred during delivery. by a jumper. The power setting is marked clearly Report any such damage to transit agent immediately. on the back panel. Be sure to check the back panel Save both the packing box and foam blocks for future before connecting the line voltage. The line voltage use in case re-shipment is required. After unpacking the must be within ±10% of the setting voltage. Line system, check for the following included items. frequency must be within a range of 46 Hz to 68 Hz. • One programmable multifunction generator The instrument should not be turned on and off quickly and repeatedly as loss of data saved in system • One logic probe memory may result. • One BNC cable Replacement fuses must be 2 A for the 120 VAC or 1 • One Power Cord A for the 220 VAC. The fuse holder is inside the AC • One Operating Manual power receptacle. 1.4 INSTRUMENT IDENTIFICATION If the MODEL 4051 needs cleaning, the rubber boot can be easily removed for cleaning purposes. To... -
Page 7: Section Two: Functions
Positive(+VS) or Negative (-VS) power supply adjustment memorize the active quantity of each accessed function, mode, this key enables or inhibits the “Tracking” allowing the user to switch between functions without adjustment mode for both power supplies. The “CAL” key also restores saved settings from program memory. 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 2.2.2 “SOURCE” KEY the triple output power supply. The control signal for Sweep, Burst, and Modulation Note: BK Precision also offers the MODEL 4050, a specially operations of the function generator can be selected confi gured MODEL 4051 without a triple output power supply. either from an Internal (INT) or External (EXT) source. The SOURCE key toggles between sources for the 2.2 FUNCTION KEY SWITCH control signal when pressed. By default, functions are set to (INT) mode. The Source key also serves as the There are fourteen key switches around the LCD display. entry key to Program memory, either for memory storage Each key cap is printed with the name of a dedicated or memory recall operations. In SINGLE BURST mode, function or a general control name. When a function the SOURCE key is used to fi re a single pulse manually key is pressed, on-screen messages appear to indicate when TIME is set to the maximum quantity. the active operation. Page 9... -
Page 8: Sweep" Key
FUNCTIONS 2.2.3. “SWEEP” KEY 2.2.6 “SET” KEY The frequency sweeping function can be selected either Under normal operation, the SET key turns the in Linear (LIN) or Logarithm (LOG) mode. Pressing the back light of the LCD display on or off. When the SWEEP key can toggle between these two operations. function generator is set to perform a Sweep, Burst, By default the Sweep function is set to LIN mode. or Modulation operation, this key allows the user to strobe each step and adjust quantity during set up. 2.2.4 “BURST” KEY This key also allows the user to store current settings to program memory. The output signal from the 50 OHM BNC Jack can be controlled as a single (SINGLE PULSE) Burst or a 2.2.7 “RNG UP” KEY multiple (MULTP) Burst of a pulse train. Pressing this key can toggle between these two types of operations. Pressing this key can increase the output frequency by By default the Burst function is set to SINGLE mode. a decade until the range reaches 20 MHz. The current range is displayed by the side of this key in a total of 2.2.5 “MOD” KEY eight different ranges. The main generator output can be modulated by an 2.2.8 “RNG DN” KEY internal signal (a standard 1 KHz sine wave) or an external signal from the VCG/MOD BNC Jack. Pressing Pressing this key can decrease the frequency range by a this key selects between frequency modulation (FM) decade, until the range reaches 2 Hz. or Amplitude modulation (AM). By default, the modulation function is set to FM. Page 10 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com... -
Page 9: Waveform" Key
FUNCTIONS 2.2.9 “WAVEFORM” KEY 2.2.12 “LOGIC” KEY Selects the waveform of the output signal Sine, Square, Selects the logic signal for TTL 5 V, TTL 3.3 V or CMOS or Triangle waveform. The displayed waveform by the Logic at the TTL/CMOS output Jack, the logic threshold side of this key is the current output waveform. levels of the logic probe, the triggering levels of the counters, and the logic power supply (Vcc) outputs. 2.2.10 “SYM” KEY 2.2.13 “ADJUST” KEY This key enables the duty cycle function, which adjusts the symmetry of the main output signal and TTL/CMOS Pressing this key at any time will abort other functions signal. The arrow signs on the display ( or ) or or and enter into function generator coarse frequency indicates the adjusted direction. For a signal with a adjustment mode. This key can then toggle between duty cycle other than 50%, one of the arrows will be coarse and fi ne frequency adjustments. The type of displayed constantly. quantity being adjusted is indicated by the blinking sign displayed above the “ADJUST” key. 2.2.11 “OFFSET” KEY 2.2.14 “FUNCTION” KEY This key enables DC offset adjustment of the main output signal. The positive and negative (+),(-) signs on Controls functions and displays for operations the display indicates the direction of the DC offset. As outside of the function generator. Press to start the long as an offset exists, a sign will be displayed. multifunction sequence mode. Upon entering this Secondary function: In multifunction sequence mode, multifunction sequence, each additional press of the this key serves as the backward key. “FUNCTION” key advances forward one step in the sequence, the “OFFSET” key steps backward, and the “ADJUST” key aborts the sequence. -
Page 10: Control Knob
FUNCTIONS On the MODEL 4051, the function sequence advances 2.3.2 AMPLITUDE POT in the following order: Controls the amplitude of the signal at the output jack Function Generator->Freq. Counter(EXT CNTR)->Low Freq. with 20Vp-p into the open circuit, 10Vp-p into the Counter(EXT CNTR TOTAL)->TOTALIZE Counter(TOTAL)-> Digital Voltmeter (DVM)->CMOS level(C-LEVEL)->Positive 50 OHM. Attenuation factors can be a total of –40 dB Supply (+Vs)->Negative Supply (-Vs)->Logic Supply (Vcc) from the maximum. Note: On the specially confi gured MODEL 4050 unit, the sequence 2.4 BNC OUTPUT AND INPUT JACKS loops to the beginning after the CMOS Level function since it lacks the MODEL 4051’s triple output power supply. There are fi ve BNC jacks located on the right side of the front panel, two for output signals and three for 2.3 CONTROL KNOB input signals. There are two control knobs on the front panel, one is • 2.4.1 50 OHM MAIN OUTPUT dedicated to the signal output level control, and the Used for main function generator output with superimposed DC other is multiplexed for all other adjustments. offset and Duty cycle adjustment. • 2.4.2 TTL/CMOS OUTPUT 2.3.1 DIGITAL ENCODER 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 The digital encoder can adjust and memorize up to independent of output level control from the Amplitude Pot and 18 active quantities, allowing users to switch between DC offset controls. -
Page 11: Vcg/Mod Input
Input. A higher positive voltage will decrease the generator 2.6.2 -Vs JACK output frequency. In Modulation operations, this jack is used for Variable negative supply output from 0 to –24 V with typical modulation input source. output current 1.5 A. The negative supply can be adjusted independently, or tracked with +Vs (positive) supply. • 2.4.5 BURST INPUT Used to input an external gating signal for Burst operations. The 2.6.3 +5 V/3.3 V (VCC) JACK user is able to apply a TTL logic signal with proper width through Logic supply output 5 V or 3.3 V depending on selected mode this port when connected to an external (EXT) source. with typical output current of 5 A. 2.6.4 GND JACK 2.5 LOGIC/DVM PROBE JACK Ground terminal for power supply and system inputs/outputs. Used to connect the furnished logic probe for voltage 2.7 RESET SWITCH and frequency measurement (0.04 Hz to 35 MHz) and logic circuit activity analysis. The reset switch is located through a pin hole on the front panel. When activated, it resets the MODEL 4051 2.6 TRIPLE OUTPUT DC POWER SUPPLY JACK to its factory default state. You should only reset your machine if any of the following conditions occurs: On the MODEL 4051, a triple output power supply is provided through four banana sockets located on the • The voltage of the golden capacitor has dropped below left lower side of the front panel. On the MODEL 4050 1.8V due to the unit being in non-operation state for a long special confi guration, there is no triple output power period of time and all display and key switches are stuck supply and the four banana sockets are not available. after the power is turned on. Page 13... -
Page 12: Power On/Off Switch
FUNCTIONS • Any part of the display and key switches are not functioning System messages are displayed around the four normally due to static charge or improper operation. edges of the LCD near its corresponding function key. Displayed system messages identify the current • All previous settings in the memory fi le need to be erased. operation and settings. When adjustments are made using the Digital Encoder, blinking signs indicate the To reset, the machine, the power must be turned on. settings being affected. Insert a paper clip or pin through the RESET pin-hole and push down until the display resets. 2.10 RS-232C SERIAL PORT 2.8 POWER ON/OFF SWITCH A DB9 sub female connector is located on the back The power switch is located on the lower left corner of panel to allow the user to connect the unit to a the panel, with a red LED as the power indicator. computer for: 2.9 LCD • remote monitoring 5”x1.5” Liquid Crystal Display with CCFL back light. • control of sensors or activators in corrective or analytical In the display center, there is a 6-digit indicator used to applications show: This connector connects pin 2 to TXD, pin 3 to RXD, pin5 to ground, and is set at 9600bps 1 stop, 8-bit no • output signal for the function generator parity mode. • incoming signal for the counter • voltage measurement displays for the Digital Voltmeter (DVM) •... -
Page 13: Vcg Output
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 reaches 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 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com... -
Page 14: Section Three: Operation
OPERATION SECTION THREE: OPERATION ramp or sawtooth waves, and slewed sine waves. The sweep generator can digitize start and stop 3.1 THEORY OF OPERATION frequencies with variable sweep time displayed in linear or logarithmic mode. Burst operation enables The MODEL 4051 programmable multifunction the generator output to be controlled by an internal or Generator is a versatile signal source, combining external signal with a single burst or multiple bursts of four common lab instruments into one low cost, a pulse train at a variable width and timing. The output user friendly, and highly portable unit. The heart of can also be amplitude or frequency modulated by a the function generator is a VCG (Voltage-Controlled 1 KHz sine wave internally or by an external applied Generator) that produces precision sine, square or signal. triangle waves over the 0.2 Hz to 20 MHz range. A built in auto ranging frequency counter displays the Digital adjustments of active quantities is performed output frequency of the generator, or external signals by the digital encoder on up to 18 different quantities. from the counter input or logic probe. The active adjustment displays on the bar graph, expanding to the right with increasing quantities and Coarse and fi ne frequency tuning controls permit shrinking to the left with decreasing quantities. Some precision setting of the output frequency which is then digital values may be converted into analog quantities locked within ± 0.2% by the auto frequency locking by a digital to analog (D/A) converter for analog circuit function to eliminate drift caused by temperature, controls. moisture or component degeneration. A continuously variable DC offset allows the output to be injected Electrical power for the system is delivered through directly into circuits at the correct bias level, and the a switching AC to DC converter. The MODEL 4051... -
Page 15: Basic Function Generator Operation
OPERATION supply can be monitored by the DVM while being 3.2 BASIC FUNCTION GENERATOR OPERATION adjusted. The auto-ranging DVM can also measure the DC voltage inputted from the logic probe. The Pressing the “ADJUST” key at any time during universal logic probe is able to display all logic states function operation will abort from other functions in six unique formats. and enter the Basic Function Generator mode. In this mode, frequency and frequency range will be A memory backup feature saves settings and allows displayed on the LCD screen. As the digital encoder the MODEL 4051 to work similar to a conventional is turned, the active quantity being adjusted will be mechanical switch operated instrument, restoring identifi ed by a blinking sign. 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 3.2.1 COARSE FREQUENCY ADJUSTMENT different testing specifi cations for different testing needs. A built-in RS232C serial port to the computer Pressing the “ADJUST” key at any time will abort any enables the user to perform remote monitoring, control active operations and enter into the Basic Function of sensors, or control of actuators in corrective or Generator in Coarse Frequency Adjustment mode and analytical applications. the COARSE FREQ sign will blink on the LCD screen to indicate the current mode. Turning the digital encoder The MODEL 4051 is a versatile instrument, capable clockwise will increase the frequency and turning it of providing a variety of output waveform and counter clockwise will decrease the frequency by large functions. To gain a working familiarity with the unit, units. The bar graph will also grow or shrink to indicate... -
Page 16: Fine Frequency Adjustment
OPERATION auto-frequency locking feature may not function 3.2.2 FINE FREQUENCY ADJUSTMENT properly due to inadequate adjusting range. 3.2.4 RANGING SELECTION When the “ADJUST” key is pressed, the default adjustment mode is coarse frequency. Pressing the “ADJUST” key a second time will change the Pressing the “RNG UP” or the “RNG DN” keys can adjustment mode to fi ne frequency. Fine frequency instantly change the frequency by a decade. Eight mode is indicated by a blinking FINE FREQ sign on available ranges can be selected from 2 Hz to 20 MHz. To use this function, select the range and then adjust the LCD screen. When the digital encoder is turned during fi ne frequency mode, quantity adjustments will the frequency by using the coarse and/or fi ne increase or decrease by smaller units. To return to frequency adjustments. Output frequencies from coarse frequency mode, press the “ADJUST” key again. 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. 3.2.3 FREQUENCY LOCKING After a desired frequency is tuned by coarse or fi ne 3.2.5 WAVEFORM SELECTION frequency adjustment, the frequency locking function is automatically activated, holding the variation of the At any time except in frequency counter mode, tuned frequency within ±0.2%. This function is only pressing the “WAVEFORM” key can change the available when the “COARSE FREQ” or “FINE FREQ” is output waveform—sine, square, and triangle. The displayed above the “ADJUST” key. -
Page 17: Duty Cycle (Symmetry) Control
TRIANGLE 0V will be displayed. If the duty cycle is at exactly 50%, no arrows will be displayed as long as the generator outputs the signal. TTL 0V Pressing the “CAL” key will bring the signal back to symmetry again and the duty cycle arrows will disappear. As the main generator output waveform is a CMOS 0V 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 FIGURE 3.1 Output Waveform and Phase Relationship 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 Page 20 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com... -
Page 18: Dc Offset Control
OPERATION rate when the waveform key is set for a square wave. 3.2.7 DC OFFSET CONTROL Varying the duty cycle will result in a slight change in frequency, which can be corrected by adjusting the A DC component can be added to the output signal coarse or fi ne frequency controls. by pushing the OFFSET key. When DC Offset Control is activated, the message DC OFFSET is fl ashed on the screen. The offset component is adjusted using the digital encoder. Positive adjustments are made by turning the encoder counterclockwise, resulting Pulse (Square) in a “+” 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 Ramp introduced can be varied by ±10 V as output in an (Triangle) open circuit or ± 5 V to a 50 OHM load termination when the amplitude 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. Slewed (Sine) FIGURE 3.2 Effect of Symmetry Variation Page 21... -
Page 19: Output Level Amplitude Control
The amplitude level of the output signal is adjusted using the “Amplitude” control knob. Rotating this knob 1. Zero DC Offset 1. Zero DC Offset with Maximum with Maximum clockwise varies the output amplitude from minimum Signal 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 2. Offset Limits jacks is independent of the Output Level Amplitude Without Clipping Control knob. Positive Negative 3.3 SWEEP OPERATION DC Offset DC Offset The Sweep function of the MODEL 4051 provides automatic variation of the output frequency. From 3. Excessive Offset 3. Excessive Offset 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 Positive Negative DC Offset DC Offset operation, select the waveform and make adjustments to the frequency, amplitude, duty cycle, and DC FIGURE 3.3 Use of DC OFFSET Control 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 Page 22... - Page 20 • To toggle between Internal (INT) or External (EXT) control signal source, press the SOURCE key. • When the “STOP” sign fl ashes, turn the encoder to select the ending frequency. Note: During the Sweep operation or after Sweep mode is selected, some key switches are disabled. To abort the function and return to • Press the “SET” key to strobe the selection. Basic Function Generator mode, press the SWEEP or ADJUST key. • The Sweep Operation starts and the display fl ashes start frequency The frequency variation pace is determined by the and stop frequency and blinks the “TIME” sign. initial selection of LINEAR or LOGARITHMIC. If the sweep mode frequency range or frequency points • Turn the encoder to adjust the sweeping time from “START” to “STOP”. While the digital encoder is being turned, the sweep need adjustment, press the SET key to stop the sweep operation will temporarily stop. operation and return to the original set up procedure to modify the operation as desired. If the start frequency To perform a Sweep operation using external control signal source: selected is lower than the stop frequency, the frequency sweep is increased from low to high, otherwise, the • Make sure that the signal source is set to EXT. Press the SOURCE frequency sweep is decreased from high to low. button to toggle. • Press the SET key. “EXT” and “COARSE FREQ” will fl ash on the To perform a Sweep operation using internal control signal source: display to indicate that the 4051 is ready for an external signal. • Make sure the signal source is set to INT. Press the SOURCE • Use the encoder to adjust the starting frequency. button to toggle. • Plug in an external control voltage source to the VCG/MOD BNC Page 23...
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Page 21: Burst Operation
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: • 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. • To operate the function generator as a sweep generator, apply a Figure 3.4 Sweep Operation positive ramp signal to the VCG/MOD input jack. As the ramp voltage increases, the frequency decreases. The rate of sweep 3.4 BURST OPERATION can be adjusted by varying the frequency of the ramp signal. • A specifi c frequency can be selected by applying a fi xed DC The burst function of the 4051 allows for the gating voltage to the input jack, or the output frequencies can be capability of the generator output signal to be switched stepped by applying a stepping DC voltage. on and off either by an internally generated signal or by an externally applied signal. The gating operation can Note: Linear (LIN) and Logarithmic(LOG) modes are not available when using an external source since the Sweep mode and timing are be selected as “Single” shot or a “Multiple” pulse train. fully controlled by the external source. 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. Page 24... - Page 22 • Turn the Digital Encoder to adjust the number of pulses in each To perform Burst operation using an Internal(INT) trigger source in burst. The burst width can be continuously variable from 5% to Single Burst mode: 90% of internal gating frequency. • Make sure an Internal(INT) source is selected. • Press the “SET” key to stop the burst operation and return to set- up and make any modifi cations as needed. • Press the BURST key to select SINGLE burst mode operation. To perform Burst operations using an External(EXT) trigger source: • Press the SET key. The “TIME” message will blink and a single shot of pulse is present at the output jack. The output signal in • Make sure an External(EXT) trigger source is selected. Press the burst operation is triggered at the middle point of the rising edge, SOURCE key to toggle. regardless of whether the MODEL 4051 is operating in single or multiple burst mode. The output signal burst is always a full • Connect an external logic control signal to the BURST BNC cycle increment or decrement. input jack. The output signal will be triggered at the negative going edge of the external signal in a single or multiple bursts, • To adjust the time in between each single burst, turn the digital depending on the Burst setting. encoder. When the TIME bar graph is set all the way to the right at max., automatic single burst generation is disabled, and each Note: Width and Time settings are not available when using an single shot must be fi red manually by pressing the SOURCE key. external source since the Burst width and time intervals are fully controlled by the external source. Page 25 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176...
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Page 23: Modulation Operation
OPERATION Figure 3.6 Multiple Burst Figure 3.5 Single Burst/Key Pulse 3.5 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... - Page 24 OPERATION the Modulation operation and the LCD will show • Push the “SET” key to strobe the selection. The “%” sign will “FM” under the MOD key and “INT” under the fl ash, and the output signal will be amplitude modulated by the SOURCE key to indicate the default modes of the internal 1 KHz signal, reducing the output signal’s amplitude. Modulation operation. Press the MOD key to toggle between frequency modulation(FM) and amplitude • Turn the encoder clockwise to increase the percent of modulation, counterclockwise to decrease it. modulation(AM). Press the SOURCE key to toggle between an Internal(INT) or External(EXT) output signal To perform the Modulation operation using an External Source: source. Before entering the modulation operation, select the waveform and adjust the frequency, • Make sure an External(EXT) modulating signal is selected. Press amplitude, duty cycle, and DC offset of the output the SOURCE key to toggle. signal as described above. • Make sure a suitable external modulating signal is connected to the VCG/MOD input jack. To perform the Modulation operation using an Internal Source: • The output signal will be frequency modulated or amplitude • Make sure an Internal(INT) output signal source is selected. Press modulated by this input signal depending on the selection of the SOURCE key to toggle. the “MOD” key in “FM” or “AM”. The encoder can adjust the degree of the modulation as described above. • Press the SET key. The “∆F” sign will fl ash, indicating that the output signal is being frequency modulated by the internal 1 KHz During the Modulation operation or after Modulation sine wave signal. mode is selected, some key switches are disabled. To abort the function and return to Basic Function • Turning the encoder will vary the amount of deviation. Generator mode, press the MOD key or ADJUST key.
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Page 25: Multiple Function Operation
OPERATION 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 fi rst 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. Figure 3.7 Example of AM Modulation Page 28... -
Page 26: Counter Operation
OPERATION or a variable triggering level. To measure a logic signal or signal with a large swing in amplitude: • For frequencies less than 3 Hz, the display will fl ash with 0.00 Hz indicating that the under range is detected and the user • Plug in the logic probe and select the appropriate logic threshold must change to low frequency counter for lower frequency for TTL or CMOS by pushing the “LOGIC” key. TTL 5 V and TTL measurement. Upon entering frequency counter mode, all the 3.3 V have the same logic threshold. The CMOS threshold is waveform generator functions of the MODEL 4051 are disabled, controlled by the C-LEVEL. (Refer to 3.6.5. C-LEVEL control). but the functions of the triple output power supply and logic probe are still available. • Adjust the “C-LEVEL” until the voltage is equal to the V of the circuit to be measured. For measuring the frequency with a large • The logic probe will be disabled once variable voltage setting swing in amplitude, the TTL or CMOS logic threshold can also be mode is selected. selected as the triggering level. 3.6.2 LOW FREQUENCY COUNTER OPERATION To measuring an AC signal with a DC bias or a signal with small amplitude swing: When the MODEL 4051 is set to frequency counter (EXT CNTR) mode, pressing the FUNCTION key • Make sure the signal is connected to the EXT COUNTER input jack on the front panel. produces the “EXT CNTR TOTAL” message and “0.00 Hz” on the LCD. The low frequency counter acts like • Press “LOGIC” key until “VOLTAGE SETTING” displays. a timer and is able to measure slower events from 0.04 Hz to 3 Hz. • Turn the digital encoder clockwise until the bar graph is at max. • Adjust the encoder in a counterclockwise direction to reduce Input to the low frequency counter must be made the triggering level until the fi rst reading is shown. For a stable through the logic probe and not from the “EXT... -
Page 27: Totalize Counter (Total) Operation
OPERATION over 3 Hz, the display will fl ash with “3.00 Hz”, will show the message “TOTAL” and “0”, indicating a indicating an over-range detection. It will be necessary step through into the Totalize Counter Operation. The to shift back to frequency counter (EXT CNTR) mode totalize counter counts the number of transitions in for measurement of higher frequencies by pressing a series of pulse trains with random frequencies and the OFFSET key. Since the low frequency counter is sequences and aggregates the counts. The counter is designed to measure slow events, it will take longer triggered at the positive going edge of the input clock before its readings are displayed on the LCD. Signals and will count up to 999,999 with a bandwidth of DC below 0.04 Hz are not measured and the display will to 5.0 KHz. To select the appropriate logic threshold, remain unchanged at 0.00 Hz. triggering level, and signal input port, follow the procedure outlined in section 3.6.1. To initiate the During low frequency counter operations, the previous Totalize Counter to perform a new reading, press the measurement reading will be cleared only as the CAL key to reset the counter to 0. next event cycle is detected. The reading will not Note: Upon entering the Totalize Counter mode, the function of the automatically reset to 0.00 Hz like it does during waveform generator is disabled. Only the power supply and logic the frequency counter operation. The display can be probe are still available. All the conditions and applications remain manually reset to 0.00 Hz by pressing the CAL key. unchanged as in the Low Frequency Counter mode. Note: Upon entering the low frequency counter mode, the function 3.6.4 DIGITAL VOLTMETER (DVM) OPERATION of the waveform generator is disabled. Only the power supply and logic probe are still available. All the conditions and applications The next step in the multi-function sequence after the remain unchanged as in frequency counter mode. Totalize Counter is the Digital Voltmeter operation. - Page 28 OPERATION from the tip of the logic probe. While performing DVM Note that the voltage being displayed and adjusted is operations, the waveform generator is able to make actually the V voltage that is being applied to the changes in the frequency range, waveform, and coarse CMOS Output Driver and not the actual CMOS output frequency. The DC offset and duty cycle will be disabled signal level. Under normal conditions, the CMOS but both settings can be adjusted prior to entering into output signal level is slightly less than its V supply multi-function mode. voltage. Since the LOGIC key controls the logic probe’s voltage The user can also view the change from an externally threshold and the power supply maintains the preset connected scope by connecting the scope input to the output voltages, setting the multi-function sequence TTL/CMOS output jack and then setting the LOGIC key in “DVM” mode allows for the most convenience in setting to CMOS. The C-LEVEL Adjustment function performing multiple testing operations simultaneously. controls the CMOS output level swing and also the threshold of the CMOS logic probe. C-LEVEL voltage 3.6.5 CMOS LOGIC OUTPUT LEVEL ADJUSTMENT levels must be adjusted to be equal or close to the voltage of the circuit under test. Once the C-LEVEL Pressing the FUNCTION key from the DVM Operation voltage value is set, stepping forward or backward in will advance into the CMOS Logic Output Level the multifunction sequence will not affect its value. Adjustment Operation which is indicated by the To change the C-LEVEL voltage value, the C-LEVEL message “C-LEVEL” and the previous adjusted V Operation must be accessed again by stepping forward supply voltage for CMOS logic displayed on the (FUNCTION) or backward (OFFSET) into it from LCD. The V supply voltage may be changed using multifunction mode operation.
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Page 29: Positive Power Supply (+Vs) Adjustment
OPERATION 3.6.6 POSITIVE POWER SUPPLY (+Vs) ADJUSTMENT 3.6.7 NEGATIVE POWER SUPPLY (-Vs) ADJUSTMENT Pressing the FUNCTION key from the C-LEVEL Pressing the FUNCTION key from the Positive Power Operation steps the MODEL 4051 into the Positive Supply Adjustment Operation will step into the Power Supply Adjustment Operation, indicated by the Negative Power Supply (-Vs) Adjustment Operation, message “+Vs” and the previously adjusted voltage on which is indicated with the message “-Vs” and the the LCD. Adjustments can be made to the voltage using previous adjusted voltage value on the LCD. The the digital encoder. Clockwise turns of the encoder will value can be adjusted using the digital encoder with increment the voltage up to 24 V and counterclockwise clockwise turns increasing voltage up to -24 V and turns will decrease the voltage down to 0 V. counterclockwise turns decreasing voltage down to 0 V. During this operation, the CAL key will turn on or off During this operation, the CAL key will turn on or off TRACKING functionality. After the CAL key is pressed TRACKING functionality. After the CAL key is pressed and the message “TRACKING” is shown on the display, and the message “TRACKING” is shown on the display, the negative power supply (-Vs) will be adjusted to the negative power supply (-Vs) will be automatically mirror the positive power supply (+Vs) voltage value adjusted to mirror the positive power supply (+Vs) in the opposite polarity. Once TRACKING mode is voltage value in the opposite polarity. Once TRACKING deactivated, the positive and negative power supply mode is deactivated, the positive and negative power voltages can be adjusted separately again. supply voltages can be adjusted separately again. Once the Positive Power Supply adjustment is set, it Once the Negative Power Supply adjustment is set in will remain set while other functions are accessed. this operation, it will remain set while other functions To change the +Vs value, the Positive Power Supply are accessed. To change the -Vs value, the Negative... -
Page 30: Logic Power Supply (Vcc) Control
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 - For injecting the signal, connect the logic power supply to the external the LCD. The 5.0 V value is selected when the LOGIC TTL circuit and then press the “LOGIC” key to select TTL mode of 5.0 V key is set to TTL 5 V mode or when CMOS is selected. or 3.3 V (depending on external circuit). 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 fi xed logic threshold. Setting the TTL mode to the correct level (5 V or 3.3 V) will allow the logic probe to function properly for either type of circuit. Note: Changing the logic power supply mode while power is being applied to the circuit under test may result in permanent damage to - The threshold of the CMOS logic varies as its supply voltage changes. the circuit. Do not change the logic power supply mode while the To address this, adjust the CMOS logic voltage equal or close to the circuit is being powered by the MODEL 4051. 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 fi rst step of the sequence, and return to Basic be selected for the desired triggering level. Function Generator mode. Page 33... -
Page 31: Program Memory Operation
OPERATION 3.8 PROGRAM MEMORY OPERATION increments up to “P-10”. These are storage slots for data fi les. Slots that are already used will be marked The memory backup feature allows the MODEL 4051 with a “CAL” sign when its number is displayed. Unused slots do not show the “CAL” sign. The user can to work similar to a conventional mechanical switch operated instrument. All previous modes, settings save current values to any slot by pressing the SET key. and quantity adjustments are restored immediately Saving data sets to an occupied data slot will result after power up. The MODEL 4051 also features data in the loss of the data in the slot as the current data memory which stores up to ten different fi les that can overwrites the previously stored data. be retrieved with the press of a key. Memory storage or retrieval operations can only be performed from the 3.8.2 PROGRAM MEMORY RETRIEVAL Basic Function Generator mode which can be accessed at any time by pressing the ADJUST key. Files stored using the Program Memory Storage Operation can be retrieved from the Basic Function 3.8.1 PROGRAM MEMORY STORAGE OPERATION Generator mode by pressing the SOURCE key until the desired data set is reached. To retrieve the data All adjustments and values used in the MODEL 4051’s set, press the CAL key. The stored values and settings many operations can be saved to memory and retrieved will be loaded into active memory and all subsequent for future use. The MODEL 4051 has room for eleven adjustments in operations will be performed from the stored fi les, one for storage of active data from current retrieved values and modes. To terminate a memory... -
Page 32: Computer Remote Control Operation
OPERATION 3.9 COMPUTER REMOTE CONTROL OPERATION Button Button RNG UP RNG DN OFFSET The RS-232C serial port on the back panel of the SOURCE MODEL 4051 provides a communication interface ADJUST FUNCTION to a computer for remote controlled operation. SWEEP BURST The interface cable has DB9 sub female-to-male connectors. The connections between these two LOGIC WAVEFORM connectors are pin-to-pin straight connections. The Each function key is represented by a key on the computer keyboard settings of the RS232 protocols have a baud rate of 9600 bps in 8-bit, one stop, no parity mode. After the Pressing the corresponding key on the computer inputs and outputs of the MODEL 4051 are connected performs the same purpose as pushing the actual key to the external devices, which may be either sensors on the MODEL 4051’s front panel. Press the ENTER or activators, remote monitoring and control of these key to view changes or responses from the 4051. devices can be performed for correctional or analytical applications through the connected computer or a The Digital Encoder can be adjusted either by steps or networked computer. by the minimum amount. The numerical keys on the computer keyboard represent the percentage of bar All functions can be controlled remotely by a computer graph adjustments within the whole range. except for the amplitude control potential for the output signal. On Windows operating systems, no 0—0%, 1—10%, 2—20%, 3—30%, 4—40%, 5—50%, 6—60%,... -
Page 33: Input And Output Protection
OPERATION to view the response. Highly specifi c numbers can 3.11 INPUT AND OUTPUT PROTECTION also be obtained by pressing the + or – keys on the keyboard to increment or decrease by the minimum Excessive voltage present at the input or output of the adjustment. MODEL 4051 may cause internal circuit damage. The user should be aware of the maximum limitations of 3.10 FACTORY DEFAULT SETTINGS each port. When the reset key is pressed and held down, the ten 3.11.1 BNC OUTPUT JACK storage slots are cleared and the active settings default back to the original factory settings (listed below). The 50 OHM main generator output is continuously protected up to ± 25 V and from short circuits to the Frequency Range: 20K ground, while providing a 20 Vp-p output signal into Waveform: Sine Wave the open circuit and 10 Vp-p into the 50 OHM load. Coarse or Fine Frequency Adjust: Bar graph in the Mid Range DC Offset: 0 (mid range) The TTL/CMOS logic signal output is also continuously Duty Cycle: 50% (mid range) protected up to ±25 V and from short circuits to the Logic: TTL 5 V (controls logic probe threshold. Logic signal and power supply Vcc outputs) ground. Counter Triggering Voltage: Mid Range +Vs: 12 V (Mid Range) 3.11.2 BNC INPUT JACK TRACKING: Off -Vs: -12 V (Mid Range) C-LEVEL: 5 V The “Ext Counter” protects up to the maximum Source: INT (Internal) SWEEP: LIN (Linear) measurement range of ± 260 V DC/AC continuously. -
Page 34: Logic/Dvm Probe Input
OPERATION 3.11.3 LOGIC/DVM PROBE INPUT output power of 120 W. If the total power exceeds this limit, the switching power supply will be turned The logic probe tip protects up to the maximum off automatically. To restore power turn off the power switch, wait for a few seconds, and then turn the power measurement range of ± 260 V DC/AC continuously. switch back on again. 3.11.4 POWER SUPPLY 3.12 ONE-STEP OUTPUT AMPLITUDE CONTROL All the triple output power supplies on the MODEL In addition to the output amplitude control available 4051 are equipped with short circuit, over-current, over-temperature and over-voltage protection. through the Amplitude Potential knob, the 4051 also Although the MODEL 4051 has been carefully features a one-step output amplitude control that will designed with appropriate protective circuitry, decrease or increase the output amplitude by 20 dB. exceeding the limitations may still cause damage. When the 4051 is not in multifunction sequence The following protective measures and considerations mode, one-step 20 dB output amplitude control can be are highly recommended: accessed by pressing the “CAL” key. Pressing the “CAL” key the fi rst time will decrease the output signal by • Verify that all signal inputs are connected to valid input sources. 20 dB and the “CAL” sign will appear on the LCD screen to indicate that the one-step output amplitude • Verify the polarity of connections plugged into the power supply control function is active. Pressing the “CAL” key again ports. will increase the output signal by 20 dB. • For continuous operation of the triple output supplies, limit total maximum output power to under 80 W. While in function generator mode, pressing the “CAL” key will fi rst reset the duty cycle to 50% and The switching AC to DC converter, which supplies the DC offset to zero if they are not already neutral. -
Page 35: Logic Probe Operation
OPERATION Subsequent key presses of the “CAL” key will adjust the for testing TTL circuits and CMOS mode for CMOS output signal down or up by 20 dB. Adjustments made circuits. In CMOS mode the “C-LEVEL” voltage using the one-step amplitude control function can be level must be adjusted to be equal or come close fi ne tuned by turning the amplitude potential knob. to the Vdd of the circuit under test. 3.13 LOGIC PROBE OPERATION 3.14 LIMITATIONS OF THE NEGATIVE POWER SUPPLY The furnished logic probe allows the user to analyze For continuous operation, the 4051’s negative output the circuit activities on the circuit board. The frequency power supply has output current limitations. When the or DC Voltage with the logic state of the signals can be output voltage is -24V, the maximum available current measured and displayed simultaneously. Logic signal is 1.5A. data is displayed through the red and green LED lights on the logic probe. As the output voltage decreases, the voltage between the input and output of the regulator increases and LOGIC LOGIC SQUARE (+) GOING (-) GOING TRI-STATE excess heat is generated. If output current were HIGH WAVE PULSE PULSE maintained at maxium levels, thermal shut-down of the linear regulator could occur. With lower output voltages, output loading must be reduced. As the FLASH*... -
Page 36: Section Four: Operating Steps & Troubleshooting
OPERATING STEPS & TROUBLESHOOTING SECTION FOUR: OPERATING STEPS make adjustments to the output signal duty cycle. AND TROUBLESHOOTING 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 4.1 INTRODUCTION back to neutral. In the previous chapter, all operations of the MODEL 7. Press the LOGIC key to select the TTL/CMOS logic output 4051 were described in detail. For improved ease signal for TTL 5 V, TTL 3.3 V, or CMOS. of use, this chapter provides step-by-step operating 8. Press the SET key to turn ON/OFF the LCD back light. instructions for each of the 4051’s applications. 4.3 FREQUENCY SWEEPING OPERATION 4.2 BASIC FUNCTION GENERATOR MODE Press the ADJUST key to return to basic function Pressing the ADJUST key at any time will abort any generator mode. active functions and return the user to the Basic Function Generator in coarse frequency adjustment (A) Linear (LIN) Sweeping with Internal (INT) Control Source mode. 1. Press the SWEEP key. 1. Press the ADJUST key again to toggle into fi ne frequency adjustment mode if desired. 2. Press the SET key. 2. Press RNG UP or RNG DN to select the frequency range. 3. Turn the encoder to adjust the starting frequency. 3. Press WAVEFORM to select the output signal waveform in 4. Press the SET key. sine, square or triangle. 5. Turn the encoder to adjust the stop frequency. 4. Press the SYM key and turn the digital encoder knob to Page 39... -
Page 37: Output Signal Burst Operation
OPERATING STEPS & TROUBLESHOOTING 6. Press SET key. - the output frequency decreases as the voltage rises over +10.2 V and the output signal will stop oscillating or will 7. The Sweeping operation is present at the output. Turn the generate an invalid signal. encoder to adjust the sweeping speed. - the frequency variation speed depends on the frequency of 8. Press SET key to stop the operation and return to step (2). the input signal. Press SWEEP key or ADJUST key to abort the sweeping operation. 5. Press the “SET” key to stop the operation, and return to step (2). Press the “SWEEP” key or the “ADJUST” key to abort the operation. (B) Logarithm (LOG) Sweeping with Internal (INT) Control Source 1. Press the SWEEP key twice. 4.4 OUTPUT SIGNAL BURST OPERATION 2. Remaining steps are identical to the steps given for linear Press the “ADJUST” key to return to basic function sweeping, from step (2) to step (8). generator mode. (C) Frequency Sweeping with External (EXT) Control Source (A) SINGLE burst with Internal (INT) Control Source 1. Press SWEEP key. 1. Press the “BURST” key. 2. Press SOURCE key to switch to external control source. Sweep mode options (LIN) or (LOG) will become disabled. 2. Press the “SET” key 3. Press SET key. When “EXT” and “COARSE FREQ” fl ashes - A single burst signal will be present at the output. on the display, turn the encoder to adjust the max. starting frequency. - Turn the encoder and adjust the burst “TIME” to maxium. Each pulse can be generated manually by pressing the 4. Apply positive stepping or ramping signals to the VCG/ “SOURCE” key. MOD input jack. At the starting max. frequency, the applied signal must be 10.0 V or lower. As the frequency 3. Press “SET” key to stop the operation and return to step 2. -
Page 38: Output Signal Modulation Operation
OPERATING STEPS & TROUBLESHOOTING (B) Multiple (MULTP) Burst with Internal (INT) Control Signal (D) Multiple (MULTP) Burst with External Control Source 1. Press the BURST” key twice. 1. Press the “BURST” key. 2. Press the “SET” key 2. Press the “SOURCE” key. - multiple bursts of the signal will be present at the output 3. Press the “SET” key. - turn the encoder to adjust the number of pulses in a burst 4. A multiple signal burst will be fi red, triggering on the negative going edge of the control signal connected to (burst width). the “BURST” BNC input jack. The burst width and timing 3. Press the “SET” key to stop the operation and return to step depends on the control signal’s duty cycle and frequency. (2). Press the “BURST” key or the “ADJUST” key at any time to abort the operation. 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. (C) SINGLE Burst with External (EXT) Control Signal Source 1. Press the “BURST” key. 4.5 OUTPUT SIGNAL MODULATION OPERATION 2. Press the “SOURCE” key. Press the “ADJUST” key to return to basic function generator mode. 3. Press the “SET” key. - A single signal burst will be fi red, triggering on the (A) Frequency Modulate (FM) the Output Signal with Internal (INT) negative going edge of the control signal connected to the 1 KHz Sine Wave “BURST” BNC input jack. 1. Press the “MOD” key. 4. Press the “SET” key to stop the operation and return to step (3). Press the “BURST” key or “ADJUST” key to abort the 2. Press the “SET” key. - Page 39 OPERATING STEPS & TROUBLESHOOTING 3. The output signal is frequency modulated by the internal 3. Press the “SET” key. 1KHz sine signal. Turn the encoder to adjust the degree of the frequency deviation. 4. The output signal is frequency modulated by the external signal connected to the VCG/MOD BNC input jack. Turn 4. Press the “SET” key to stop the operation, and return to step the encoder to adjust the degree of frequency deviation. (2). Press the “MOD” key or “ADJUST” key to abort the operation. 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. (B) Amplitude Modulate (AM) the Output Signal with Internal (INT) 1KHz Sine Wave (D) Amplitude Modulate (AM) the Output Signal with External 1. Press the “MOD” key twice. (EXT) Signal Source 2. Press the “SET” key. 1. Press the “MOD” key twice. 3. The output signal is amplitude modulated by the internal 2. Press the “SOURCE” key. 1KHz sine signal. Turn the encoder to adjust the percentage of the amplitude modulation. 3. Press the “SET” key. 4. Press the “SET” key to stop the operation, and return to step 4. The output signal is amplitude modulated by the external (2). Press the “MOD” key or “ADJUST” key to abort the signal connected to the VCG/MOD BNC input jack. operation at any time. Turn the encoder to adjust the percentage of amplitude modulation. (C) Frequency Modulate (FM) the Output Signal with External (EXT) 5. Press the “SET” key to stop the operation, and return to Signal Source step (3). Press the “MOD” or “ADJUST” key to abort the operation at any time. 1. Press the “MOD” key. 2. Press the “SOURCE” key.
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Page 40: Frequency Counter, Low Frequency
OPERATING STEPS & TROUBLESHOOTING 4.6 FREQUENCY COUNTER, LOW FREQUENCY will be cleared at the triggering edge of the next event or manually by pressing the “CAL” key. COUNTER, AND TOTALIZE COUNTER OPERATION 6. When operating the Totalize Counter, the “CAL” key The frequency counter measures signal from 3 Hz to 35 needs to be pressed to clear the display before the next MHz. The low frequency counter measures signal from measurement can be taken. 0.04 Hz to 3 Hz, and the Totalize counter counts the (B) Measure the AC signal with a DC bias or a Signal with small transition of the signal. During the operation of these Amplitude swing. three counters, the function generator is disabled as a result of having no output signal at the TTL/CMOS and 1. Connect the signal to the “EXT COUNTER” BNC input jack. main generator output due to circuit sharing. 2. Press the “FUNCTION” key to select one of the Counter functions. (A) Measuring the logic signal or a signal with large swing in amplitude. 3. Press the “LOGIC” key until the display shows “VOLTAGE SETTING”. 1. Plug the logic probe into the LOGIC/DVM socket 4. Turn the encoder to adjust the triggering voltage level of the 2. Press the “FUNCTION” key once for the frequency counter counter until a stable reading is reached. (EXT CNTR). Press twice for the low frequency counter (EXT CNTR TOTAL). Press three times for the Totalize counter 4.7 MULTI-FUNCTION SIMULTANEOUS OPERATION (TOTAL). 3. Press “LOGIC” key to select the appropriate logic threshold 1. Adjust the Duty Cycle and DC Offset of the generator as for the triggering voltage of the counter. needed. 4. Probe the signal source with the tip of the logic probe, the 2. Press the “FUNCTION” key to adjust the voltage of the measurement result will display on the LCD screen. power supply (+Vs and –Vs) for the circuit being tested. 5. The low frequency counter measures slower events and 3. Press the “LOGIC” key to select the appropriate logic family needs more time to complete a cycle. The previous result... -
Page 41: Positive And Negative (+Vs & -Vs) Power Supply Adjustment
OPERATING STEPS & TROUBLESHOOTING for the circuit and the logic probe. 4. Adjust the negative voltage using the digital encoder as in step 2. 4. Press the “OFFSET” key to back step to “DVM” mode. (B) Synchronized Positive and Negative Adjustments (Dual Tracking) 5. The logic probe can now analyze circuit activity. 1. Press the “FUNCTION” key until the display shows either - The LCD screen shows the voltage reading of the test “+Vs” or “-Vs” and the previously set voltage. probe being probed. 2. Press the “CAL” key. - The triple output power supply maintains the preset output voltage. 3. The “TRACKING” sign will be displayed and the negative polarity will instantly track to the positive polarity. When - The waveform generator is still available to the user for “TRACKING” mode is activated, any adjustments made to making changes to the frequency range, waveform, and the positive (+Vs) or negative (-Vs) polarity will change the coarse frequency. positive (+Vs) polarity and track the negative (-Vs) polarity to match it. 4.8 POSITIVE AND NEGATIVE (+Vs & -Vs) POWER SUPPLY ADJUSTMENT 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 (A) Separate Positive and Negative Adjustments. will be restored to its pre-tracking value. If any voltage value adjustments were made during “TRACKING” mode 1. Press the “FUNCTION” key until display shows “+Vs” by turning the digital encoder, both the positive (+Vs) and negative (-Vs) polarity values will remain at their adjusted 2. Adjust the positive voltage by turning the encoder clockwise tracked values. to increase the voltage and turning it counterclockwise to decrease the voltage until the desired output voltage is 4.9 CMOS OUTPUT LEVEL (C-LEVEL) AND ADJUSTMENT displayed on the LCD. 3. Press the “FUNCTION” key again. The display should show The default C-level output value is set to 5 V. For a “-Vs” to indicate negative voltage adjustment mode. -
Page 42: Program Memory Operation
2. Stop on the desired program number. The slot should be marked with the “CAL” sign, indicating that the slot is being 1. Press the “FUNCTION” key until the display shows used for data storage. “C-LEVEL” with the previous setting voltage. 3. Press the “CAL” key and the settings saved to the memory 2. Turn the encoder clockwise to increase the voltage and slot will be retrieved and loaded for immediate use. counterclockwise to decrease the voltage until the desired Vdd is reached. 4.11 RS-232C COMPUTER INTERFACE EXAMPLE Note: The the actual CMOS output signal level is slightly less than the displayed “C-LEVEL” Voltage. Most PCs running the Windows operating systems are able to support the RS-232C interface used by the 4.10 PROGRAM MEMORY OPERATION MODEL 4051 to connect to a computer for remote testing operations. No additional software is required. Press the “ADJUST” key to return to basic function The following set-up instructions for the remote generator mode. interface are written specifi cally for the Windows 98 operating system. Set-up for other Windows operating (A) To Save Current Settings to Memory systems should be similar. 1. Press the “SOURCE” key to scroll through the ten storage slots. Occupied slots are denoted with the “CAL” sign. 1. Use the DB9 Male to Female Serial Cable for straight through connections. 2. Press the “SET” key to save active settings to the numbered storage slot shown on the display. If the slot is occupied, 2. Connect the male side of the DB9 cable to the MODEL the data saved in it will be overwritten with the current 4051 and the female side to the COM1 port of the PC. If active settings. - Page 43 FUNCTION->F, SWEEP->P, BURST->B, MOD->M, SYM->Y, LOGIC->L, WAVEFORM->W 4. Change the Hyperterminal program’s settings to connect ENCODER=>+=up,-=down,0=0%,1=10%,2=20%,3=30%,4=40%,5=50%,6=60%,7=70 %,8=80%,9=90%, directly to the COM port the cable was plugged into. *=100% ---------->PRESS ENTER TO UPDATE CURRENT READOUT!<---------- 5. Connect using the following parameters: ==========>CURRENT_READOUT: 12.106KHz<========== FUNCTION: GENERAL DUTY_CYCLE: NEUTRAL Bits per second: 9600 DC_OFFSET: NEUTRAL Data bits: 8 RANGE: 20KHz Parity: None LOGIC: TTL_5 V Stop bit: 1 WAVE_FORM: SINE Flow control: Xon/Xoff SOURCE: INT TRACKING_STATUS: NON-TRACKING SETTING: COARSE Click “ OK” to exit to the next window. The chosen ICON ENCODER_SETTING(%)= 50 name will show on the screen. (Once the ICON name > has been set up, just double click it on the communication window. 6. Make sure all cable connections are secure to the computer and the MODEL 4051, then turn on the 4051. Figure 4.1 Initial Output on PC Screen 7. Press the “ENTER” key on the computer keyboard. If the remote interface set-up was successful, you should the information in fi gure 4.1 on the computer monitor screen. 8. To operate the 4051 through the remote interface, please see section 3.8 for detailed instructions. Page 46...
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Page 44: Troubleshooting Guide
OPERATING STEPS & TROUBLESHOOTING 4.12 TROUBLESHOOTING GUIDE PROBLEM: The LCD Screen and the LED Power light fails to light up when the power switch is fl ipped to the “ON” position. If you experience problems operating your MODEL - Check the AC power cord and make sure that it is securely 4051, please review the troubleshooting tips in this connected to the AC power plug on the MODEL 4051. section for solutions to common problems before - Check the fuse in the compartment of the AC receptacle. contacting your dealer. PROBLEM: There is no output signal from the main and TTL/CMOS PROBLEM: As the power is turned “ON” some of the key switches output ports are disabled or the LCD display acts erratically. - Check the MODEL 4051 to see if it is in Low Frequency - Static charges, prolonged non-operation, and improper Counter, Frequency Counter, or Totalize Counter mode. user operation of the MODEL 4051 may cause the When the 4051 is in one of the counter modes, the output switches or LCD screen to malfunction. To correct this signal to the TTL/CMOS and main output is disabled as a problem press the ADJUST key. If the machine still does result of circuit sharing. not respond, reset the machine by using a pin to hold down the Reset button on the front of the 4051. PROBLEM: The power supply voltage drops as loading is added to it. PROBLEM: The logic probe functions improperly or with only the - Each power supply has a maximum output current limit. green LED (logic low) fl ashing If loading exceeding it’s maximum output is added to it, the supplied voltage will drop. Please see the technical - For the logic probe to function properly, the correct type specifi cations for maximum output current values. - Page 45 OPERATING STEPS & TROUBLESHOOTING in “DUTY CYCLE”, “DC OFFSET” or Voltage Adjustment PROBLEM: The mode is stuck on Low Frequency Counter Mode mode frequency drift may occur. (EXT CNTR TOTAL) after the FUNCTION Key is pressed and all the keys are disabled. PROBLEM: Adjustments to the “C-LEVEL” voltage fails to change the - There may be an external signal connected to the EXT. amplitude of the CMOS output signal in an external scope. COUNTER Input Jack or the Logic Probe tip, causing a continuous interrupt to the machine. Disconnect both of - Make sure that “CMOS” mode is selected. If TTL 5 V or these inputs and press the FUNCTION key again. TTL 3.3 V mode is selected, press the “LOGIC” key until “CMOS” mode is displayed. PROBLEM: When adjusting the frequency using the digital encoder, the frequency changes in incremental values. PROBLEM: When the power is turned “ON” the display lights up - This is normal behavior. The MODEL 4051 employs an for a very short time then turns off. 8-bit digital to analog converter to control the “COARSE FREQ” and “FINE FREQ” adjustments, dividing each range - Turn off the machine and remove all loads that are into 256 steps of incremental values. Each adjustment to connected to the triple output supply. Turn the power the frequency will increase or decrease the frequency by the back on. If the problem still exists, there may be a short value of one step instead of a continuous numerical value. 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...
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Page 46: Section Five: Specifications
SPECIFICATIONS SECTION FIVE: SPECIFICATIONS Square Wave Symmetry: < 2% 0.15 Hz to 100 KHz Rise Time: ≤ 20 ns FUNCTION GENERATOR: Overshoot & Undershoot: ≤ 6% FREQUENCY CHARACTERISTICS Triangle Wave Linearity: 98% up to 100 KHz Wave forms: Sine, Square, Triangle, ±Pulse, ±Ramp Range: 0.15 Hz to 20 MHz in 8 ranges TTL OUTPUT (Open - Circuit Condition for Frequencies ≤ 2 MHz) Resolution: 0.01, 0.1, 1, 10, 100 Hz Display Max. Logic Low Level Voltage: ≤0.4 V Tuning Range: Coarse: 10:1, Fine: ±3% of Coarse Setting Min. Logic High Level Voltage: ≥2.6 V Variable Duty Cycle: 15:85:15 Continuously variable Rise Time: ≤ 15 ns Operating Modes: Normal, Sweep, VCG, AM, FM, Single Duty Cycle: 50% typical Burst, Multiple Burst Frequency Stability: ±0.2% of the tuning frequency CMOS OUTPUT (Open - Circuit Condition for Frequencies ≤ 2 MHz) Level: Output from 3.0 V to 15.0 V ±0.5 Vp-p OUTPUT CHARACTERISTICS Rise Time: ≤120 ns Impedance: 50 ohm ±10% VCG (Voltage Controlled Generator) INPUT Level: 200 mV to 20V p-p Open-circuit, 10V p-p into 50 ohm Input Voltage: 0-10V ±0.5 V causes a 10:1 frequency change to 10 MHz Impedance: 10K ohm ±5% Amplitude Control: Variable, 20 dB range typical DC Offset: Preset: ±0.10 V typical, Variable: ±10V open- SWEEP OPERATION circuit, ±5 V into 50 ohm Mode: LIN/LOG Source: Internal, External Sine Wave Width: 10:1, continuously variable Rate: 10 ms to 1 sec, continuously variable Distortion: <... - Page 47 SPECIFICATIONS AM MODULATION CHARACTERISTICS AUTO-RANGING COUNTER Source: Internal, External Input Characteristics: Modulation Ratio: 5% to 100% Impedance: 1 M OHM / 100 pf INT. Modulation: 1 KHz Coupling: AC (Ext. counter BNC input)/DC (logic probe input) EXT. Modulation: DC to 500 KHz Max. Overload Protection: ±260 V AC/DC EXT. Sensitivity: Less than 10Vp-p for 100% modulation Sensitivity: ≤ 0.45 Vrms Accuracy: Time base accuracy ±1 count ±trigger Triggering Threshold: Selectable for TTL, CMOS, logic threshold FM MODULATION CHARACTERISTICS or 0-3.5 V continuously adjustable triggering level. Source: Internal, External Deviation: 0 to 5% LOW FREQUENCY COUNTER (Display shown “EXT. CNTR TOTAL”) INT. Modulation: 1 KHz Range: 0.04 Hz to 3 Hz EXT. Modulation: DC to 500 KHz Resolution: 0.01, 0.001 Hz EXT. Sensitivity: Less than 10 Vp-p for 100% modulation Max. Display: 4 digits Input Port: Logic Probe only BURST CHARACTERISTICS Mode: Multiple, Single, or Key controlled one shot TRANSITION (TOTALIZE) COUNTER ( Display shown “TOTAL”) Source: Internal, External Frequency Range: up to 5.0 KHz Burst Width: Continuously variable from 5% to 90% of Max. Display: 6 digits internal gating frequency Reset Key: “CAL” Repetition Rate: 0.5 Hz to 50 Hz, internal or DC to 500 KHz Input Port: Logic Probe for DC coupling or EXT. CNTR BNC Jack external when frequency is greater than 3Hz.
- Page 48 1.5 A* High Threshold 2.0V ± 10% 70% Vdd* ±15% DVM display 3-digit 4-digit 4-digit Low Threshold 0.8V ± 10% 30% Vdd* ±15% Short Circuit, Over-current, Over-voltage, Overload Protection *Vdd is controled by C-Level Reverse Polarity, Over-temperature Ripple & Noise 10 mVrms 10 mVrms 10 mVrms MAX. Repetitive Frequency Response: 35 MHz (With probe Dual Tracking** miniature clip to GND) * For continuous operation, the output current of -Vs supply reduces Min. Single Pulse Detection: 15 ns (With probe miniature clip as output voltage drops. (see 3.14 for limitations of the -Vs supply) to GND) ** -Vs tracks +Vs or independent adjustment Display Format: Logic High, Logic Low, Square clock, Positive PHYSICAL PROPERTIES: Going Pulse, Negative Going Pulse, Tri-state. 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 49 PANEL DIAGRAMS PANEL DIAGRAMS: MODEL 4051 MULTIFUNCTION GENERATOR...
- Page 50 LOGIC/DVM PROBE: The furnished logic probe is connected here for convenient voltage, frequency measurement, and logic circuit analysis. RNG DN Key: Decreases output frequency by a decade. 50 OHM Output: Main function generator output with superimposed DC Offset and Duty WAVEFORM Key: Selects output signal (Sine, Square, or Triangle.) Cycle adjustment. Digital Encoder: Adjusts up to 18 different quantities (displayed by bar graphic) for each TTL/CMOS Output: Provides logic signal output with same frequency and Duty Cycle as the desired function. 50 OHM Output. Amplitude Pot: Adjusts the amplitude of the output signal. Ext. Counter: Input for external frequency measurement with AC coupling only. SYM Key: Enables the Duty Cycle adjustment function. Burst Input: Input external gating signal for Burst operation. OFFSET Key: Enables the DC Offset adjustment function. Also steps backwards while in VCG/MOD Input: Input external control signal for Sweep or Modulation operation. multi-function sequence mode. RS-232C Serial Port: Connects to computer for remote operation. 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. GCV Output: Generator Control Voltage output. Voltage proportional to generator frequency. +Vs: Variable positive supply output from 0 to +24V. (Note: Not Available on MODEL 4050) 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. Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com...
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