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Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   
Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   


An internal switch allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel.  The upper beam is positioned off screen in this mode.
A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel.  The upper beam is positioned off screen in this mode.


==Specifications==
{{BeginSpecs}}
When set for maximum sensitivity, the 502A is 100 μV/cm and has a vertical bandwidth of 50 kHz.
{{Spec | Deflection | 100 μV/cm to 20 V/cm, 1−2−5, ±3% }}
At lower sensitivity settings the bandwidth increases - at 200 mV/cm the bandwidth is 1 MHz.
{{Spec | Bandwidth | 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm }}
At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.
{{Spec | CMRR | 502A: 40,000:1 @ 100 mV/cm and 1 kHz }}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{Spec | Sweep | 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20 }}
{{Spec | CRT | Type [[T60P2]] (P1, P7 or P11 were available as options); 3 kV acceleration }}
{{Spec | Dimensions | 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H }}
{{spec | Weight | 23.6 kg (52lb) }}
{{EndSpecs}}


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:[[Category:Specifications needed]]''please add''

Revision as of 08:56, 7 May 2019

{{{manufacturer}}} 
1 MHz dual beam differential scope
Tek 502 front

Produced from 1958 to 1973

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 502 is a dual-beam oscilloscope introduced in 1958, followed by the 502A in 1963.

Both beams have differential inputs. The horizontal deflection plates are common to both beams.

A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel. The upper beam is positioned off screen in this mode.

Key Specifications

Deflection 100 μV/cm to 20 V/cm, 1−2−5, ±3%
Bandwidth 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm
CMRR 502A: 40,000:1 @ 100 mV/cm and 1 kHz
Input impedance 1 MΩ // 47 pF
Sweep 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20
CRT Type T60P2 (P1, P7 or P11 were available as options); 3 kV acceleration
Dimensions 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H
Weight 23.6 kg (52lb)
please add

Models

There is a 502, a 502A, and a rack-mount model, the RM502A. The A models have beam finder switches for each channel.

Prices

Year 1959 1961 1963 (A) 1971 (A)
Catalog price $825 $825 $1,050 $1,265
2018 value $7,070 $6,890 $8,560 $7,790

Internals

There is a transistor-regulated 6.2 VDC 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

Pictures

502

502A

RM502A

Third version 502A, serial number greater than 31,000

Diagrams