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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
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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 will 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. Higher voltages pose
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Instruction Manual for Model 4040A 20 MHz SWEEP/FUNCTION GENERATOR with FREQUENCY COUNTER 22820 Savi Ranch Parkway • Yorba Linda, CA 92887 3
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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 ................................ 8 Ou
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SPECIFICATIONS FREQUENCY CHARACTERISTICS Waveforms: Sine, Square, Triangle, ± Pulse, ± Ramp Square Wave Range: 0.2Hz to 20MHZ in 8 ranges Symmetry: ≤2% 0.2Hz to 100kHz Resolution: Rise Time: ≤30ns (Typical) Tuning Range: Coarse: 10:1, Fine: ± 5% of Coarse Overshoot & Setting Undershoot ≤5% Variable Duty Cycle 15:85:15 Continuously Variable Operating Modes Normal, Sweep, VCG, AM, FM, Burst TRIANGLE WAVE Frequency Stability: The output will change less tha
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SPECIFICATIONS Repetition Rate: 0.5Hz to 50Hz, internal or DC to SWEEP OPERATION 500kHz, external Mode: LIN / LOG Burst Frequency: Determined by the main generator Width: 100:1, Continuously variable frequency setting. Tone burst is in Rate: 20mS to 2 sec, continuously integral cycles of frequency being variable gated. Sweep Output: 0 to 2V FREQUENCY COUNTER Start/Stop Accuracy: Time Base Accuracy ±1 Frequencies: Adjustable count AM MODULATION CHARACTERISTICS T
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Figure 1. Model 4040A Front Panel. 19 BURST OFF/ON Switch. Selects external or 17. BURST WIDTH Control. Adjusts the duty internal burst gate. Continuous output is obtained cycle of the internal burst gate. with switch in the OFF position and no external 18. % MODULATION Control. Adjusts the burst gate is applied. percentage of AM or FM modulation. 9
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CONTROLS AND INDICATORS 27. SWEEP STOP Control. Adjusts the ending sweep 20. .START/STOP Switch. Enables adjustment of the starting frequency. and stopping sweep frequencies. The actual adjustment is 28. COARSE FREQUENCY Control. Coarse adjustment performed by the SWEEP START and SWEEP STOP of the output frequency from 0.1 to 1 times the selected controls (29 and 27). START/STOP selection is enabled range. only when the SET/RUN switch (21) is set to SET. 29. SWEEP START
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OPERATING INSTRUCTIONS The B&K Precision Model 4040A Sweep/Function Generator is a 5. Rotate the COARSE (28) frequency control to quickly set the versatile instrument, capable of producing a variety of output output frequency to the approximate desired value. The FINE waveforms over a broad range of frequencies. To gain a working (26) frequency control can then be used to easily set the output familiarity with the unit, it is recommended that it be connected to the specific desired
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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 50 Ω). 7. A DC component can be added to the output signal by pushing in the DC OFFSET switch (4) to enabl
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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 50 Ω to minimize ringing. Also, keep cables as short
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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. 5 illu
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OPERATING INSTRUCTIONS 3. With BURST ON/OFF switch in OFF position, apply a AM OPERATION TTL gating signal of the proper width to the front panel The output of Model 4040A can be amplitude-modulated, BURST INPUT jack. 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. The visible portion of the 1. Set the
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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 cont
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OPERATING INSTRUCTIONS 4. Connect a suitable modulation signal to the VCG/MOD will vary the frequency which is pre-selected by the range INPUT jack on the front panel. switches and the frequency controls. Applying 5. Adjust the amplitude and frequency of the external approximately +l0 V with the COARSE control at full signal as required. Typically, a signal less than 10V p- clockwise decreases the output frequency by about 100 p will provide 10% modulation of the carrier.
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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 The frequency counter display in the Model 4040 is SWEEP LIN/LOG switch. normally used to monitor the internally generated output. 2. Rotate COARSE FREQUENCY Control to minimum (CCW). However, it can also be used as a stand-alone frequency 3. Engage t
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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. The Model 4040 is overload protect
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MAINTENANCE INSTRUMENT REPAIR SERVICE WARNING The following instructions are for use by qualified service personnel Because of the specialized skills and test equipment required for only. To avoid electrical shock, do not perform servicing other than instrument repair and calibration, many customers prefer to rely contain ed in the operating instructions unless you are qualified to upon B+K PRECISION for this service. We maintain a network do so. of B+K PRECISION au
