INSTRUCTION MANUAL Model 4040A MANUAL DE INSTRUCCIÓN MODELO 4040A 20 MHz SWEEP/FUNCTION GENERATOR with FREQUENCY COUNTER 20 MHz GENERADOR DE BARRIDO/FUNCIONES CON CONTADOR DE FRECUENCIA
TEST INSTRUMENT SAFETY WARNING Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be performed where exposed voltage is present. An electrical shock causing 10 milliamps of current to pass through the heart wil l stop most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions.
Instruction Manual for Model 4040A 20 MHz SWEEP/FUNCTION GENERATOR with FREQUENCY COUNTER 22820 Savi Ranch Parkway • Yorba Linda, CA 92887 3
TABLE OF CONTENTS TEST INSTRUMENT SAFETY .......... inside front cover Voltage Controlled Frequency Operation ....................... 17 INTRODUCTION ....................................................... 5 Sweep Operation .......................................................... 18 SPECIFICATIONS ..................................................... 6 Use of Frequency Counter with External Signals ............ 18 CONTROLS AND INDICATORS ...............................
INTRODUCTION The B&K Precision Model 4040A Sweep/Function Generator is a versatile signal source which combines several functions into one unit - waveform generation, pulse generation (through variable symmetry), and frequency sweep. Additionally, the instrument provides the added convenience of a built-in frequency counter. This permits more accurate determination of output frequency than is possible with a simple calibrated dial.
SPECIFICATIONS FREQUENCY CHARACTERISTICS Waveforms: Sine, Square, Triangle, ± Pulse, ± Ramp Range: 0.2Hz to 20MHZ in 8 ranges Resolution: Tuning Range: Coarse: 10:1, Fine: ± 5% of Coarse Setting Variable Duty Cycle 15:85:15 Continuously Variable Operating Modes Normal, Sweep, VCG, AM, FM, Burst Frequency Stability: The output will change less than 0.09% over 15 minutes after 1 hour warmup.
SPECIFICATIONS SWEEP OPERATION Mode: Width: Rate: Repetition Rate: LIN / LOG 100:1, Continuously variable 20mS to 2 sec, continuously variable 0 to 2V Sweep Output: Start/Stop Frequencies: Adjustable AM MODULATION CHARACTERISTICS Source: Internal, External Modulation Ratio: 0 To 100% INT. Modulation: 1kHz EXT. Modulation: DC to 500KHz EXT. Sensitivity: Less than 10V p-p for 100% modulation FM MODULATION CHARACTERISTICS Source: Internal, External Deviation: 0 to 5% INT. Modulation: 1kHz EXT.
CONTROLS AND INDICATORS FRONT PANEL (Refer to Fig. 1) 1. POWER Switch. Turns power on and off. 2. DUTY CYCLE Switch. When engaged, enables operation of DUTY CYCLE control (7). 3. CMOS LEVEL Switch. When engaged, changes the TTL signal to CMOS signal at the TTL/CMOS jack, and enables operation of CMOS LEVEL Control (8). 4. DC OFFSET Switch. When engaged, enables operation of the DC OFFSET control (11). 5. -20dB Switch. When engaged, the signal at the OUTPUT jack is attenuated by 20dB. 6. RANGE Switch.
Figure 1. Model 4040A Front Panel. 19 BURST OFF/ON Switch. Selects external or internal burst gate. Continuous output is obtained with switch in the OFF position and no external burst gate is applied. . 17. BURST WIDTH Control. Adjusts the duty cycle of the internal burst gate. 18. % MODULATION Control. Adjusts the percentage of AM or FM modulation.
CONTROLS AND INDICATORS 20. .START/STOP Switch. Enables adjustment of the starting and stopping sweep frequencies. The actual adjustment is performed by the SWEEP START and SWEEP STOP controls (29 and 27). START/STOP selection is enabled only when the SET/RUN switch (21) is set to SET. 21. RUN/SET Switch. Selects sweep set or sweep run operation. In the SET position, the starting or ending sweep frequency is continuously present at the output.
OPERATING INSTRUCTIONS The B&K Precision Model 4040A Sweep/Function Generator is a versatile instrument, capable of producing a variety of output waveforms over a broad range of frequencies. 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 waveforms can be observed. Use this manual as required for reference until becoming accustomed to the operating procedures. 5.
OPERATING INSTRUCTIONS 6. Adjust the amplitude of the output as desired using the OUTPUT LEVEL control (10). Rotation of this control varies the amplitude from maximum to 20dB below maximum. An additional attenuation of -20dB is available by pushing in the -20dB switch (5). The attenuation factors can be combined for a total of -40dB. The maximum signal level is 10V p-p (into 50Ω). 7.
OPERATING INSTRUCTIONS 4. When the 2 Hz range is selected, the gate time is 10 seconds and the display is updated once every 10 seconds. The result of a frequency change will not be displayed until 10 seconds later. Adjust the frequency in progressively smaller steps, waiting for the display to update until the desired frequency is obtained. 5. When outputting square waves or when using the TTL output, terminate the cable into 50Ω to minimize ringing. Also, keep cables as short as possible. 6.
OPERATING INSTRUCTIONS 3. Varying the duty cycle setting results in a slight change in frequency. Adjust the COARSE and FINE frequency controls as required. BURST OPERATION In gated burst mode of operation, the generator output is switched on and off (gated), either by an internally generated signal or by an externally applied signal. Both the repetition rate and the duty cycle are variable. Fig.
OPERATING INSTRUCTIONS 3. With BURST ON/OFF switch in OFF position, apply a TTL gating signal of the proper width to the front panel BURST INPUT jack. AM OPERATION The output of Model 4040A can be amplitude-modulated, either by the internal 1 kHz signal, or by an external signal applied to the VCG/MOD INPUT jack. Considerations Internal l. Make sure the tone burst and entire off period is viewed when setting the repetition rate.
OPERATING INSTRUCTIONS 3. Place the EXT MODULATION switch in the released position. 4. Connect a suitable modulating signal to the VCG/MOD INPUT jack on the front panel. 5. Adjust the modulation level as described previously. FM OPERATION The output of the Model 4040 can be frequency-modulated, either by the internal 1 kHz internal signal or by an external signal applied to the front panel VCG/MOD INPUT jack. Internal 1. Set the carrier frequency using the main FREQUENCY controls and RANGE switches. 2.
OPERATING INSTRUCTIONS 4. Connect a suitable modulation signal to the VCG/MOD INPUT jack on the front panel. 5. Adjust the amplitude and frequency of the external signal as required. Typically, a signal less than 10V pp will provide 10% modulation of the carrier. will vary the frequency which is pre-selected by the range switches and the frequency controls. Applying approximately +l0 V with the COARSE control at full clockwise decreases the output frequency by about 100 times (a 100:1 ratio).
OPERATING INSTRUCTIONS SWEEP OPERATION USE OF FREQUENCY COUNTER WITH EXTERNAL SIGNALS 1. Select LINEAR sweep by leaving the SWEEP LIN/LOG switch (23) in the released position or select LOG sweep by engaging the SWEEP LIN/LOG switch. The frequency counter display in the Model 4040 is normally used to monitor the internally generated output. However, it can also be used as a stand-alone frequency counter up to 30 MHz. 2. Rotate COARSE FREQUENCY Control to minimum (CCW) to obtain maximum sweep width. 3.
OPERATING INSTRUCTIONS OUTPUT PROTECTION CONSIDERATIONS Use care when connecting the function generator output to a signal injection point. Excessive voltage at the point of signal injection of the function generator can cause internal damage. Under normal operation, the generator output should never be connected to an external voltage other than low dc values that can be matched with the DC OFFSET control.
MAINTENANCE WARNING The following instructions are for use by qualified service personnel only. To avoid electrical shock, do not perform servicing other than contained in the operating instructions unless you are qualified to do so. Remember that ac line voltage is present on line voltage input circuits any time the instrument is plugged into an ac outlet, even if turned off. Always unplug the function generator before performing service procedures.
CUSTOMER SUPPORT 1-800-462-9832 B+K Precision offers courteous, professional technical support before and after the sale of their test instruments. The following services are typical of those available from our toll-free telephone number: Technical advice on the use of your instrument. Technical advice on special applications of your instrument. Technical advice on selecting the best instrument for a given task. Information on optional accessories for your instrument.
Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the address below. Clearly state in writing the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the address below. Clearly state in writing the performance problem and return any leads, probes, connectors and accessories that you are using with the device.
Limited Two-Year Warranty B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of two years from date of purchase. B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the form of a sales receipt. To obtain warranty coverage in the U.S.A.
TEST INSTRUMENT SAFETY (continued from inside front cover) 6. Some equipment with a two-wire ac power cord, including some with polarized power plugs, is the “hot chassis” type. This includes most recent television receivers and audio equipment. A plastic or wooden cabinet insulates the chassis to protect t he customer. When the cabinet is removed for servicing, a serious shock hazard exists if the chassis is touched.
22820 Savi Ranch Parkway Yorba Linda, CA 92887 © 2005 B&K Precision Printed in U.S.A.
