Wavetek 132 Manual Download Page 14

SECTION 3

CIRCUIT DESCRIPTION

GENERAL DESCRIPTION

Refer to the block diagram of the Model 132 VCG/

Noise Generator, Figure 3-l.

Basically, a square wave is applied to the input of an

integrator composed of a wide-band differential dc

amplifier, integrating resistor and capacitor. Output

of the integrator is fed into the hysteresis switch.

The hysteresis and output switches function like a

Schmitt trigger with the limit points set at the wave-

form extremes, firing when the triangle wave reaches

+1.25 volts and -1.25 volts. When firing occurs, the

hysteresis and output switches are set, reversing the

square wave fed into the integrator. Reversal of the

square wave causes the triangle wave to reverse direc-

VCG

VCG

Cl RCUIT

+5 v

POWER

SUPPLIES

+15 v

-15 v

H Y S T E R E S I S

OUTPUT

SWITCH

ATTENUATOR

I

MODE

SINE

 CONVERTER

  S W I T C H I N G
  C I R C U I T

FUNC

 SYNC

OUT

DIGITAL

I

I

FILTER

I

I

I

23

NOISE

 

SYNC

 NOISE

CLOCK

Figure 3-l. Functional Block Diagram

11

Summary of Contents for 132

Page 1: ...INSTRUMENT OPERATION AND MAINTENANCE THE INFORMATION IN THIS DOCUMENT MAY NOT BE DUPLICATED IN ANY MANNER WITHOUT THE PRIOR APPROVAL IN WRITING OF WAVETEK SAN DIEGO 9045 Balboa Ave San Diego CA 92123...

Page 2: ...s can be used program ensures that the latest electronic developments individually or combined to provide selectable cali are incorporated into the Wavetek instruments by the brated signal to noise an...

Page 3: ...strument comply with installation instructions MAINT ENANCE may requir e power on w i th th e instrumen t cover sremoved shoul d be don eonly by qualified personne l awar eof the elect h a zards WARNI...

Page 4: ...circuitry is capable of 1000 1 deviation The VCG amplifier has a 100 kHz bandwidth and a slew rate of 0 1 The instantaneous frequency is the result of the sum of the dial setting and the externally a...

Page 5: ...he amount of fre quency deviation NOTE When noise is added to the signal output specifications apply up to 200 kHz and the square wave rise time is dera ted by a factor of 10 In the clock range of 1 6...

Page 6: ...UNC push button Connect oscilloscope to the OUT connec tor with a terminator Set frequency dial to the 1 0 mark and FREQ VERNIER to CAL position Set function selector to the position Set OUTPUT ATTEN...

Page 7: ...nd noise generators This control has no affect on the noise frequency 2 FREQ VERNIER Allows precision electronic control of the signal output frequency A full turn of the control is approximately equa...

Page 8: ...pen circuit providing 20 V peak to peak maxi mum or into a load providing a 10 V peak to peak output OUTPUT ATTEN dB Attenuates the output both signal and noise from 0 dB to 60 dB in six calibrated 10...

Page 9: ...he value to the right of the detent mark VCG IN This connector allows external volt age control of function generator frequency Up to 1000 1 frequency change may be obtained A positive voltage increas...

Page 10: ...termination Select the desired waveform by setting function 1 2 3 4 5 Terminate OUT connector with 50 ohm 2 watt termination Select the desired waveform by setting function selector to or Set FREQ HZ...

Page 11: ...rce 1 Select the desired signal waveform by setting function selector to or 2 Set frequency dial and FREQ HZ range multi plier for desired signal output frequency 3 Depress MODE S N push button 4 Sele...

Page 12: ...t output signal amplitude by setting OUT PUT ATTEN dB control to appropriate atten uation position and fine adjusting signal to de sired amplitude with OUTPUT VERNIER dB control Operation as a Digital...

Page 13: ...lt use Converting a 115 volt unit for 230 volt operation is a simple matter 2 Loosen two captive thumb screws on rear panel and remove panel 1 Remove power cord 3 4 The conversion switch is located on...

Page 14: ...hes function like a Schmitt trigger with the limit points set at the wave form extremes firing when the triangle wave reaches 1 25 volts and 1 25 volts When firing occurs the hysteresis and output swi...

Page 15: ...is considerably less in amplitude than the triangle wave input and is thus amplified to be equal to the triangle wave Either square triangle or sine waveforms can be se lected as a signal source The n...

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