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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 MHzThe 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 frequencyIf 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 inputThis 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  
The 190 is useful for measuring the frequency response of a device whose input impedance varies with frequency. 
by a rotary variable capacitor.
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. 
The variable capacitor rotates together with a drum  
This interaction between is input impedance and gain measurements is often undesirable.  Having a constant-amplitude source simplifies the measurement.
that serves as the frequency readout dial.
 
The drum is made of cream colored plastic  
The oscillation frequency of the 190B is controlled by a rotary variable capacitor.
and has a diameter of 5" (12.5cm) and a height of 4" (10cm).
The variable capacitor rotates together with a drum that serves as the frequency readout dial.
The frequency knob on the front panel of the 190B  
The drum is made of cream colored plastic and has a diameter of 5" (12.5 cm) and a height of 4" (10 cm).
turns a rubber wheel which, by friction, turns the drum.
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  
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.
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.
The [[067-0041-00]] modification kit extends the low-frequency range of the 190A.
* [http://bama.edebris.com/download/tek/190/190.djvu Tektronix 190 Manual (DjVu)]
* [http://w140.com/tek_190ab.pdf Tektronix 190 Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_190_a_b_factory_cal_proc.pdf Tektronix 190 Factory Calibration Procedure (PDF)]
* [[Media:Tek 190 distortion meter.pdf|Distortion Measurement Fixture for Tektronix 190 (PDF, needs OCR)]]


==Pictures==
<gallery>
<gallery>
Tek 190b front.jpg|190B
Tek 190b front.jpg|190B
Line 52: Line 50:
Tek 190b on1.jpg
Tek 190b on1.jpg
</gallery>
</gallery>
==Components==
{{Parts|190}}




[[Category:Signal generators]]
[[Category:Signal generators]]

Latest revision as of 23:00, 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

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