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HEWLETT PACKARD (HP) 240A
Manual de Usuario


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Precio: $4.99

Descripción del HEWLETT PACKARD (HP) 240A Manual de Usuario

Manual del propietario completo en formato digital. El manual estará disponible para descarga como archivo PDF después de que lo compre.

El Manual del Propietario (a veces llamado Manual del Usuario o Guía del Usuario) contiene información sobre cómo utilizar su dispositivo. Después de colocar la orden le enviaremos las instrucciones de descarga a su dirección de e-mail.

The manual is available in languages: English

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Section III Paragraphs 3-18 t o 3-35 3-18. Set the SWEEP WIDTH control about half way t o maximum, turn the CRYSTAL MARKER switch on, and advance the CRYSTAL MARKER AMPLITUDE. Birdie-type m a r k e r s should appear on the oscilloscope. The number of m a r k e r s depends on the m a r k e r separation and the SWEEP WIDTH setting. 3-19. TEST SIGNAL AMPLIFIER.
TYPE 240-A

Model 240A

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R F OUTPUT-

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1 5 0 1 - 8 CABLE

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OSClLLoSCOPE
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3-20. An audio frequency signal of approximately 1/2 volt applied t o the TEST SIGNAL IN jack should appear at the COMPOSITE SIGNAL OUT jack as approximately 4 volts with the TEST SIGNALAMPLITUDE control turned full on. 3-21. AMPLITUDE MODULATION.

Figure 3-3.

Test Setup Using 501B Output Cable

3-22. Connect a diode detector circuit a c r o s s the terminals of the 501B Output Cable and connect the rectified output to the vertical input of the oscilloscope. Turn the R F LEVEL controls for full output, the function selector knob to CW, and the AM knob to ON. Adjust the internal linear sweep of the oscilloscope f o r about 1 0 0 cps. The rectified 1000 cps amplitude modulation should appear on the oscilloscope. 3-23. R F BLANKING AND FLATNESS.

Figure 3-4. Test Setup Using 501B Output Cable and 509B Output Cable

3-29.

R F OUTPUT.

Use 3-24. the diode detector and oscilloscope connections of paragraph 3-22 with the oscilloscope set t o 20 cps. Turn the CW-SWEEP sweep rate selector knob t o SWEEP and turn the SWEEP WIDTH control up about half way.
3-25. The oscilloscope waveform is shown in Fig. 3-2. The top line (demodulated R F ) and bottom line (base line) should be parallel and flat.

3-30. The R F output is obtained from the terminals of the 501B cable, which presents a source impedance of 25 ohms. The open-circuit voltage, acting in series with 25 ohms, is indicated by the combination of the meter and the RF LEVEL FULL SCALE dial. An additional 25-ohm series r e s i s t o r must be placed between t h e high terminal of the 501B cable and the input to a 50-ohm receiver. 3-31. 3-32. TEST SIGNAL IN. The detected output voltage of the circuit under

test is fed to t h e TEST SIGNAL IN jack.
3-33. SWEEP OUT

3-34. The SWEEP OUT and GND terminals are connected to the horizontal input of the oscilloscope. 3-35. The SWEEP WIDTH control determines the frequency deviation about the indicated center frequency. (See Sweep Range in Table 1-1.) NOTE: The system used for deviating an R F signal about a center frequency depends upon changing magnetic flux acting upon ferrite c o r e s in the R F oscillator coils. The center frequency, as indicated by the frequency dial, is determined by the current in a coil which is magnetically coupled to the ferrite core. Residual magnetism in the f e r r i t e and iron c o r e s can cause the center frequency calibration to be slightly off. Rotating the SWEEP WIDTH control fully clockwise and then counter-clockwise will effect the degaussing of the c o r e s and return the instrument t o proper calibration.

Figure 3-2.

R F Sweep Flatness

3-26. U S I N G THE SWEEP SIGNAL
GENERATOR.
3-27. For use as a conventional CW o r Amplitude Modulated Signal Generator, the only connection required is the 501B R F Output Cable. 3-28. Figures 3-3 and 3-4 show typical arrangements of t e s t equipment for measuring the pass-band of a radio frequency amplifier having its own detector. 3 -4

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