531

From TekWiki
Jump to navigation Jump to search
Manuals – Specifications – Links – Pictures

The Tektronix Type 531 is a 10 MHz oscilloscope that accepts letter-series and 1-series plug-ins. It is exactly like Type 535 except it does not have the Delayed Sweep (dual timebase) feature.

The 531 and 535 were the first Tektronix scopes to accept plug-ins. It was introduced in March 1954 simultaneously with the Type 535, and superseded in 1959 by the Type 531A, which has more convenient controls and a slightly faster (15 MHz) vertical amplifier.

In serial numbers 101 to 7600, the 531's L-C delay line is before the vertical amplifier. In serial numbers 7601 and up, the 531's delay line is between the vertical amplifier and the CRT. This change was the result of John Kobbe's insight that if the far end of the delay line was an open circuit (which the CRT approximates), the reflected wave could be absorbed at the source end. This "single termination" approach made it possible to do away with the output chassis. All Tek scopes using a lumped-constant delay line went to this topology.

There is also a rack-mount version, Types RM31 and RM31A. They have a sliding chassis so that the scope can be serviced without removing it from a rack.

The 532 is similar to the 531, but designed to be more reliable at the expense of slower risetime. The 541 is mostly the same as the 531, but has a distributed vertical amplifier for 30 MHz bandwidth, and a different CRT.

Key Specifications

     — 531 SN 101-7600
Bandwidth DC to 10 MHz (≤ 3 dB) with Type A plug-in
Rise time 0.035 μs
     — 531 SN 7601 up & 531A
Bandwidth DC to 15 MHz (≤ 3 dB) with Type K plug-in
Rise time 0.024 μs
     — all
Line Voltage 108/115/122/216/244 VAC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz.
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Power Consumption 475W with plug-in
Cooling AC Fan
Trigger Modes AC/DC/AC LF Reject, and HF Sync
Anode Potential 10 kV (relative to cathode)
Screen Area 6 cm × 10 cm
Construction Aluminum alloy chassis. Anodized front panel
Weight 61,5 lbs / 27,8 kg

Pictures

531

531A

RM31A


Some Parts Used in the 531

Page Class Description Used in
120-037 Discrete component power transformer 531 533
12AX7 Vacuum Tube (Dual Triode) dual triode 513 531 531A 535 536 545 545A 545B 546 547 549 555 581 581A 585 585A E Q
12BY7 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 163 531 533 535 536 541 543 535 545 545A 549 555 3A75
6197 Vacuum Tube (Pentode) sharp-cutoff pentode 516 531 533 535 535A 556 3A75
6AU5 Vacuum Tube (Pentode) 10 W beam power pentode 513 516 517 517A 531 535 541 535 545 581 581A 585 585A
6AU6 Vacuum Tube (Pentode) RF pentode 2A60 80 107 160 181 190 310 310A 316 317 360 502 502A 512 513 516 517 517A 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 575 581 581A 585 585A C CA Q
6BQ7A Vacuum Tube (Dual Triode) dual triode 107 163 310 316 360 181 315 524 531 532 535 536 541 545 T
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
T51 CRT 5" CRT 513 531 535


Some Parts Used in the 531A

Page Class Description Used in
12AX7 Vacuum Tube (Dual Triode) dual triode 513 531 531A 535 536 545 545A 545B 546 547 549 555 581 581A 585 585A E Q
6AU6 Vacuum Tube (Pentode) RF pentode 2A60 80 107 160 181 190 310 310A 316 317 360 502 502A 512 513 516 517 517A 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 575 581 581A 585 585A C CA Q
T5330 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A


Some Parts Used in the RM31A

Page Class Description Used in
T5330 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A