4S2

Tektronix 4S2
Dual channel sampling plugin 4S2 Compatible with 661 Produced from 1962 to (?) Manuals Tektronix 4S2 Manual Tektronix 4S2A Manual Calibration Tektronix 4S2 Calibration Outline (OCR) Tektronix 4S2 Field Recalibration Procedure Tektronix 4S2 Factory Calibration Procedure Tektronix 4S2A Engineering Spec (OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 4S2 is a two-channel sampling vertical plug-in for the 661. Signals enter the 4S2 through GR-874 connectors on the front panel.

Unlike the 4S1, the 4S2's signal path does not contain a delay line between the input connector and the sampler. This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth, but the disadvantage of making it impossible to see the leading edge of the triggering event unless a pre-trigger is used.

The 4S2, which was designed in 1962, uses a four-diode sampling bridge. The 4S2A, designed in 1965, uses a two-diode sampling bridge. This design change is discussed in the 4S2A Engineering Spec document linked below. The 4S2 does not provide trigger pick-off. The 4S2A provides trigger pick-off for channel A.

The 4S2 and 4S2A front panels look the same, but they use different GR-874 input connectors. The 4S2 uses a short airline unique to the 4S2. The 4S2A uses the connector-to-board system described in US Patent 3,426,311 and has some parts in common with the 3T7. The 4S2A uses a 152-0252-00 snap-off diode to generate the sampling pulse.

Key Specifications

Bandwidth	DC to 3.9 GHz
Rise time	90 ps
Deflection	2 mV/Div to 200 mV/Div, 1−2−5

Pictures

4S2

4S2
4S2
4S2
4S2
4S2
4S2 Pulse Generator
4S2 Pulse Generator
4S2 Pulse Generator
4S2 Pulse Generator
4S2 Sampler
4S2 Sampler
AC Amplifier
AC Amplifier
Memory
Memory
Inverter
Inverter
Dual Trace
Dual Trace
4S2
4S2
4S2
4S2
4S2
4S2
4S2 Samplers
4S2 Top
4S2 Top Front
4S2 Top
Pulse Generator Card Removed, Var Gain Pots
4S2 Rear

4S2A

4S2A Front
42SA sampler schematic
42SA pulse generator schematic
4S2A Pulse Generator Front
4S2A Pulse Generator Rear
4S2A Gate (Sampler) Board
4S2A step response driven by S-52. 100 ps/div.

Components

Some Parts Used in the 4S2

Part	Part Number(s)	Class	Description	Used in
120-0304-00	120-0304-00	Discrete component	inductor	4S1 • 4S2
152-112	152-112 • 152-0112-00	Discrete component	step recovery diode	4S2
6922	154-0195-00	Vacuum Tube (Dual Triode)	dual triode	3S76 • 4S2
6DJ8	154-0187-00 • 154-0305-00	Vacuum Tube (Dual Triode)	dual triode	067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
7586	154-0306-00	Vacuum Tube (Triode)	Nuvistor triode	M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311

Some Parts Used in the 4S2A

Part	Part Number(s)	Class	Description	Used in
152-0252-00	152-0252-00	Discrete component	Tek-made step recovery diode	4S2A
6688	154-0215-00	Vacuum Tube (Pentode)	miniature high-slope VHF/UHF pentode	P80 • 3T77 • 3T77A • 4S2A • 526 • TR-4602
7308	154-0371-00	Vacuum Tube (Dual Triode)	dual triode	3S76 • 3S3 • 4S1 • 4S2A • 4S3 • S-311

4S2