502: Difference between revisions

Revision as of 07:41, 15 October 2017

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1 MHz dual beam differential scope Tek 502 front Produced from 1958 to 1973 Manuals Tektronix 502 Manual (PDF) Tektronix 502A Manual (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 502 is a dual-beam oscilloscope introduced in 1958, followed by the 502A in the early 1960s.

Both beams have differential inputs.

Specifications

When set for maximum sensitivity, the 502A is 100 μV/cm and has a vertical bandwidth of 50 kHz. At lower sensitivity settings the bandwidth increases - at 200 mV/cm the bandwidth is 1 MHz. At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.

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Models

There is a 502, a 502A, and a rack-mount model, the RM502A. The price of the 502 in July 1959 was $825.

Internals

There is a transistor-regulated 6.2 V_DC heater supply for the tubes in the first stage differential amplifier. This heater supply uses the -150 V supply as its reference. The -150 V supply uses a 5651 voltage reference tube as its reference. There is no post-deflection acceleration. The CRT cathode voltage is -2900 V.

Mod 104 on a 502 provides single sweep lockout.

Later 502A have solid state (include nuvistor) input stage, a 6DJ8 as the deflection amplifier and transistors as amplifiers and cathode followers (only in the newest version).

The 502 uses a single supply for the upper beam and lower beam CRT cathodes. The 502A has separate supplies for the two CRT cathodes. This improvement in the 502A allows slight differences in horizontal CRT sensitivity between the two beams to be canceled out in step 8 of the calibration procedure.

Links

Tektronix 502A @ amplifier.cd (many internal pictures)

Pictures

502 front view
Image magnified from a flyer
502A block diagram
502A vertical amplifier
502 CRT circuit
502A CRT circuit
Cartoon in schematic: Mountain Climber
RM 502A
RM 502A display
RM 502A bottom
RM 502A transformer wiring
RM 502A top
RM 502A vibration-isolated vertical amp
502 left
502 right
502 bottom
Solid-state input stage with two 6DJ*
502A
RM502A
RM502A rear
502A right internal

@@ Line 70: / Line 70: @@
 Tek rm502a 2 1.jpg | RM502A
 Tek rm502a 2 2.jpg | RM502A rear
+Tek 502a right internal.jpg|502A right internal
 </gallery>
 [[Category:Dual beam scopes]]
 [[Category:Monolithic tube scopes]]