Global Specialties 4005 - Manual - Manual (Page 21)

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Additional information on programmed frequency selection is given in the “APPLICATIONS” chapter
of this manual.
3-9. Use as a Sweep Generator
1) Procedure
A. Set up the Model 4005 for function generator operation.
B. Select the highest frequency to be swept with the RANGE switch and the lowest frequency to
be swept with the FREQ. dial.
C. Adjust amount of sweep with the sweep rate control.
D. Adjust repetition rate of sweep with the sweep rate control.
2) Considerations
The sweep generator will sweep upward from that point. However, it will sweep upward only to the
set range limit (highest frequency to which the dial can tune on the selected range). Therefore, a
low dial setting is required to obtain a sweep covering a wide frequency range. The 0.05 setting
must be used to obtain the maximum sweep width of 100:1(highest frequency sweep is 100 times
that of lowest frequency swept).If a high dial setting and high SWEEP WIDTH setting are used
simultaneously, the generator will sweep to the range limit and ceases operation for a portion of the
sweep cycle, effectively clipping the sweep. Of course, if only a small frequency band is to be swept,
a low dial setting is not important. In fact, it may be easier to set to the desired frequencies if the
dial setting is 0.5 or higher.
3-10. Use as an Externally Controlled Sweep Generator
A ramp voltage, or any other type waveform desired, can be used for externally controlled sweep
generator operations. 0 to 10 volt swing will sweep frequencies over a 100:1 ratio (with dial set to
0.05). Set the Model 4005 as described for internally controlled sweep generator operation,
however turn the SWEEP WIDTH control to OFF. Apply the sweep voltage with no DC component
at the VCF Input BNC. Set the FREQ. dial to the highest frequency to be swept and apply a
negative-going ramp voltage.
3-11. Use as an External Frequency Counter
This instrument can be used as a counter by pushing in the INT/EXT selection switch.
A. EXT COUNT IN BNC: Accepts external frequency input.
B. COUNTER DISPLAY: Input frequency is displayed with high resolution
on the 6 Digit 7 Segment display.
D. mHz, Hz, KHz, MHz INDICATOR: mHz, Hz, KHz, MHz indicators & decimal points display a
maximum 50 MHz of external frequency.
E. FREQUENCY RANGES: W X 1.