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{{Oscilloscope Sidebar |manufacturer=Tektronix | | {{Oscilloscope Sidebar | ||
series=400-series scopes | | |manufacturer=Tektronix | ||
model=434 | | |series=400-series scopes | ||
summary=24 MHz analog storage scope | | |model=434 | ||
image=434 Tek 4.jpg | | |summary=24 MHz analog storage scope | ||
caption=Tek 434 | | |image=434 Tek 4.jpg | ||
introduced=1971 | | |caption=Tek 434 | ||
discontinued=1984 | | |introduced=1971 | ||
manuals= | |discontinued=1984 | ||
|manuals= | |||
* [[Media:070-1915-00.pdf|Tektronix 434 Instruction Manual SN 500,000+]] (complete, OCR) | * [[Media:070-1915-00.pdf|Tektronix 434 Instruction Manual SN 500,000+]] (complete, OCR) | ||
* [[Media:070-1131-00.pdf|Tektronix 434 Instruction Manual, SN <500,000]] (complete, OCR) | * [[Media:070-1131-00.pdf|Tektronix 434 Instruction Manual, SN <500,000]] (complete, OCR) | ||
* ''[[Media:070-1142-00.pdf|Tektronix 434 Operators Manual]] needed'' | |||
* [[Media:070-1142-01.pdf|Tektronix 434 Operators Manual (March 1984 Revision)]] | * [[Media:070-1142-01.pdf|Tektronix 434 Operators Manual (March 1984 Revision)]] | ||
* [[Media:Tek 432 and 434 fcp april 1972.pdf|Tektronix 432 and 434 Factory Calibration Procedure, April 1972]] (PDF) | * [[Media:Tek 432 and 434 fcp april 1972.pdf|Tektronix 432 and 434 Factory Calibration Procedure, April 1972]] (PDF) | ||
}} | }} | ||
The '''Tektronix 434''' is an analog [[CRT storage scope]] with two independent storage areas on the screen. | The '''Tektronix 434''' is an analog [[CRT storage scope]] with two independent storage areas on the screen. | ||
Revision as of 03:07, 14 October 2022
The Tektronix 434 is an analog CRT storage scope with two independent storage areas on the screen.
It has a bandwidth of 24 MHz and uses a tunnel diode in its trigger circuit. The storage is done in the CRT itself, by trapping charge on a special fine grid of isolated pads behind the phosphor where the electron beam is then blocked or released.
There is a chopped two channel system and the fastest sweep time is 20 ns/div. An option for a tube with higher sensitivity at high writing speeds was available (OPT. 01).
Key Specifications
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Internals
The signal passes through rotary cam-operated input attenuators, then passes through an input amplifier that is on a separate small board. The input amplifier contains a JFET source-follower buffer that uses a 2N5911A (Tektronix part number 151-1032-00) biased with a drain current of 12.5 mA and Vgs of –0.26 V. The input amplifier has unity gain, high input impedance, and an output impedance of about 120 Ω. The input amplifier drives a Tek-made differential amplifier chip, part number 155-0050-01.
The original instrument design utilized an all-discrete switching power supply, making this an incredibly light portable scope. Unfortunately, this power supply was extremely difficult to troubleshoot when it went belly-up. At serial number B500000 and later, the design of the supply was simplified to use the same basic circuitry as found in the 7704A using a Tek-manufactured controller chip.
Repair Issues
See → Repairs page.
Links
- Ken Matheson, Servicing the 432/434 Oscilloscopes. In Tekscope Vol. 4 No. 5, 1972
- Handle Replacement Modification Kit
Pictures
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side connections
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CRTs used in the 434
| Page | Part nos | Description | Designers | Used in |
|---|---|---|---|---|
| T4340 | 154-0666-10 • 154-0666-12 | storage CRT | 434 |
Custom ICs used in the 434
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0028-00 | M018 | 155-0028-00 • 155-0028-01 • 155-0042-00 • 155-0042-01 • 155-0042-02 • 155-0042-03 | Miller integrator and delay pickoff | Joe Burger | 5030 • R5030 • 5031 • R5031 • 1401 • 1401A • 1480 • 1481 • 1482 • 1485 • 26G1 • 26G2 • 26G3 • 314 • 335 • 432 • 434 • 4701 • 5B10N • 5B12N • 5B31 • 5B40 • 5B42 • 5S14N • 7B52 • 7B53A • 7B53N • 7L12 • 7L13 • 7L14 • 7L18 • 7S14 • AN/USM-281C • RG501 • Telequipment D63 • Telequipment DM63 |
| 155-0050-01 | M065 | 155-0050-00 • 155-0050-01 | differential vertical preamplifier | Bert tenKate | 432 • 434 |
| 155-0051-00 | 155-0051-00 | 155-0051-00 | Z-axis and HV regulator | 432 • 434 | |
| 155-0067-02 | M091B | 155-0067-00 • 155-0067-02 • 155-0067-03 | SMPS controller | Joe Burger • Gene Andrews | 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001 |