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The Tektronix Type 190A and 190B Constant-Amplitude Signal Generator is a
{{Instrument Sidebar
sine wave source that uses feedback to provide a signal whose amplitude
|manufacturer=Tektronix
does not vary with frequency or with the impedance of the load, within
|model=190
stated limits.  The frequency
|class=Signal generator
range is 350 kHz to 50 MHz.  The amplitude measurement is made using a peak-to-peak
|series=
(envelope) detector in an external attenuator head that is connected to the main
|summary=Constant-Amplitude Signal Generator
unit by a special cable.  The 190A uses a 6110 double diode tube for the detector.
|image=Tek 190b front.jpg
The 190B uses two 1N87A germanium diodes for the detector.   
|caption=Tek 190B front
|introduced=1954
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-413.pdf|Tektronix 190A/190B Manual]]
* [[Media:Tek 190 distortion meter.pdf|Distortion Measurement Fixture for Tektronix 190]]
* [[Media:50MHz to 100MHz stoll march 1959.pdf|Generating 100 MHz from 50 MHz Output of 190 or TU-50]]
* [[Media:Tek_type_190_a_b_factory_cal_proc.pdf|Tektronix 190 Factory Calibration Procedure]]
}}
The '''Tektronix Type 190A and 190B Constant-Amplitude Signal Generator''' is a sine wave source that uses feedback to provide a signal whose amplitude does not vary with frequency or with the impedance of the load, within stated limits.   


The 190 is useful for measuring the frequency response of a device whose input
The frequency range is 350 kHz to 50 MHz.  The amplitude measurement is made using a peak-to-peak (envelope) detector in an external attenuator head that is connected to the main unit by a special cable.   
impedance varies with frequency.  If a standard 50-ohm signal generator is used
The 190A uses a [[6110]] double diode tube for the detector. The 190B uses two [[1N87A]] germanium diodes for the detector.
for this purpose, the frequency-domain variations of the input impedance of the device under test
will result in frequency-domain variations in the actual signal voltage that is applied
to the input.  This interaction between is input impedance and gain measurements is
often undesirable. Having a constant-amplitude source simplifies the measurement.


* [http://bama.edebris.com/download/tek/190/190.djvu Tektronix 190 Manual (DjVu)]
The 190 is useful for measuring the frequency response of a device whose input impedance varies with frequency.
* [http://manoman.sqhill.com/pdf/tek-190.pdf Tektronix 190 Manual (PDF)]
If a standard 50-ohm signal generator is used for this purpose, the frequency-domain variations of the input impedance of the device under test will result in frequency-domain variations in the actual signal voltage that is applied to the input.
This interaction between is input impedance and gain measurements is often undesirable. Having a constant-amplitude source simplifies the measurement.


The oscillation frequency of the 190B is controlled by a rotary variable capacitor.
The variable capacitor rotates together with a drum that serves as the frequency readout dial.
The drum is made of cream colored plastic and has a diameter of 5" (12.5 cm) and a height of 4" (10 cm).
The frequency knob on the front panel of the 190B turns a rubber wheel which, by friction, turns the drum.
The relatively large diameter of the drum provides for precise frequency control, long effective length of the readout dial, and ensures that the friction coupling between the frequency knob and the drum provides sufficient torque to turn the drum and rotary capacitor without any slippage.
The [[067-0041-00]] modification kit extends the low-frequency range of the 190A.
==Pictures==
<gallery>
<gallery>
Image:Tek 190b attenuator.jpg|190B attenuator
Tek 190b front.jpg|190B
Image:Tek 190b attenuator_entire.jpg|190B attenuator
Tek 190b left1.jpg|190B
Image:Tek 190b attenuator connector.jpg|190B attenuator connector
Tek 190b right2.jpg|190B
Tek_190b_right1.jpg|190B
Tek 190b left2.jpg|190B
Tek 190b drum control wheel.jpg|Rubber wheel rotating frequency drum in 190B
Tek 190b attenuator.jpg|190B attenuator
Tek 190b attenuator_entire.jpg|190B attenuator
Tek 190a attenuator internal.jpg|190A Attenuator Internal View
190 connector.jpg | attenuator connector
Tek 190b attenuator connector.jpg|190B attenuator connector
Tek 190a attenuator front.jpg|190A Attenuator Front View
Tek 190b on2.jpg
Tek 190b on1.jpg
</gallery>
</gallery>
==Components==
{{Parts|190}}
[[Category:Signal generators]]

Latest revision as of 22:00, 9 March 2024

Tektronix 190
Constant-Amplitude Signal Generator
Tek 190B front

Produced from 1954 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 190A and 190B Constant-Amplitude Signal Generator is a sine wave source that uses feedback to provide a signal whose amplitude does not vary with frequency or with the impedance of the load, within stated limits.

The frequency range is 350 kHz to 50 MHz. The amplitude measurement is made using a peak-to-peak (envelope) detector in an external attenuator head that is connected to the main unit by a special cable. The 190A uses a 6110 double diode tube for the detector. The 190B uses two 1N87A germanium diodes for the detector.

The 190 is useful for measuring the frequency response of a device whose input impedance varies with frequency. If a standard 50-ohm signal generator is used for this purpose, the frequency-domain variations of the input impedance of the device under test will result in frequency-domain variations in the actual signal voltage that is applied to the input. This interaction between is input impedance and gain measurements is often undesirable. Having a constant-amplitude source simplifies the measurement.

The oscillation frequency of the 190B is controlled by a rotary variable capacitor. The variable capacitor rotates together with a drum that serves as the frequency readout dial. The drum is made of cream colored plastic and has a diameter of 5" (12.5 cm) and a height of 4" (10 cm). The frequency knob on the front panel of the 190B turns a rubber wheel which, by friction, turns the drum. The relatively large diameter of the drum provides for precise frequency control, long effective length of the readout dial, and ensures that the friction coupling between the frequency knob and the drum provides sufficient torque to turn the drum and rotary capacitor without any slippage.

The 067-0041-00 modification kit extends the low-frequency range of the 190A.

Pictures

  • 190B

    190B

  • 190B

    190B

  • 190B

    190B

  • 190B

    190B

  • 190B

    190B

  • Rubber wheel rotating frequency drum in 190B

    Rubber wheel rotating frequency drum in 190B

  • 190B attenuator

    190B attenuator

  • 190B attenuator

    190B attenuator

  • 190A Attenuator Internal View

    190A Attenuator Internal View

  • attenuator connector

    attenuator connector

  • 190B attenuator connector

    190B attenuator connector

  • 190A Attenuator Front View

    190A Attenuator Front View

Components

Some Parts Used in the 190

Part Part Number(s) Class Description Used in
0B2 154-0075-00 Gas Discharge Tube (Voltage regulator) 105-108 V voltage reference 110 • 190 • E • Hickok 1825 • Keithley 610
12AU7 154-041 • 154-0041-00 • 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825
1N87A 152-0129-00 Discrete component small-signal germanium diode 190
5Y3 154-009 • 154-0009-00 Vacuum Tube (Diode) rectifier 190
6110 154-0240-00 Vacuum Tube (Dual Diode) small-signal dual diode 190
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D52 • Telequipment D56 • Telequipment S52
6AU6 154-0022-00 • 157-0073-00 • 157-0059-00 • 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 • 160 • 181 • 190 • 60 • 2A60 • 72 • 3A72 • 3C66 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 506 • 511 • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • 535 • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 561 • 561A • 561S • 564 • 565 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 80 • C • CA • Q
6C4 154-029 • 154-0029-00 Vacuum Tube (Triode) VHF triode 190 • 3B2 • 507 • 511 • 511A • 517 • 517A • Chemtrix 205
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