7S14

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Tektronix 7S14
1 GHz dual-trace, delayed-sweep sampler
7S14 front

Compatible with 7000-series scopes

Produced from 1974 to 1988

Manuals


Manuals – Specifications – Links – Pictures

The Tektronix 7S14 is a 1 GHz dual-trace delayed sweep sampler plug-in. It is almost identical to the 5S14 plugin for the 5000 series.

It is a complete sampling system unlike, for example, the 7S11, which requires a separate timing plug-in to provide triggering and sampling pulse generation.

Specifications

Rise time 350 ps (1 GHz bandwidth)
Trigger bandwidth 100 MHz (Norm/Auto trigger), 1 GHz (HF sync)
Vertical deflection 2 mV/Div to 0.5 V/Div in 1−2−5 sequence
Sweep rate 100 µs/Div to 100 ps/Div in 1−2−5 sequence
Input impedance 50 Ω
Maximum input voltage 5 V peak
Features
  • Dual channel, CH1 / CH2 / Dual / Add / X−Y modes
  • Delayed timebase
  • DC Offset controls

Internals

The 7S14 contains two samplers, trigger and sweep circuitry, and circuitry to interface it with the 7000-series mainframe in which it operates. The mainframe provides the 7S14 with power. The 7S14 sends the mainframe horizontal, vertical and readout signals.

The 7S14 has an integrated delay measurement function.

The 7S14 has two triggering modes: triggered and HF-sync. In triggered mode, the signal passes through two stages of MC1672 ECL logic gate, and then into the 155-0109 trigger chip. In HF-sync mode, the 7S14 uses a BD4 back diode (0.1 mA, 3 pF), and inductor, and a 152-0177-00 tunnel diode (10 mA, 4 pF) to form an oscillator that oscillates somewhere between 16.5 MHz and 25 MHz.

The sampler used by the 7S14 is a two-diode design. Each of the two input channels has its own sampler. The sampling diodes are in CR1A and CR1B of dual diode 152-0572-00.

Most boards in the 7S14 and 5S14N are common. However, since 5000-series plug-ins are shorter than 7000 series and the mainframe interface is different, the 7S14 contains two 7000-specific interface boards (horizontal/vertical) that plug into the 7000 series mainframe. The common main horizontal board has the 5000-series interface connector fingers at the rear, these remain hidden within the 7S14 (see photo).

Repair issues

There are two 1.35 V mercury button cells, BT1 and BT2, in each of the sampler circuits. They act as floating bias sources, so if a 7S14 stops working it may be not defective, just the batteries are likely to be dead. First check the voltage on the cells. The original mercury cells can be replaced with other (less toxic) methods of bias voltage generation. Two obvious solutions are photovoltaic cells or modern batteries. The issue has been discussed extensively on the groups.io (formerly Yahoo) TekScopes forum, so search the archives there for more information. Notably, Ed Breya posted detailed notes on the 7S14 bias cell issue.

Links

Prices

Year 1974 1980 1988
Catalog price $1,850 $3,200 $6,490
2017 value $9,200 $9,520 $13,450

Pictures

Custom ICs used in the 7S14

Page Class Manufacturer Model Part nos Description Designers Used in
155-0028-00 Monolithic integrated circuit Tektronix M018 155-0028-00 155-0028-01 Miller integrator and delay pickoff 26G2 5B42 7S14 7L14
155-0042-02 Monolithic integrated circuit Tektronix M018 155-0042-00 155-0042-01 155-0042-02 155-0042-03 Miller integrator 5B42 7B53A 7S14 7L12 7L13 RG501 Telequipment D63 Telequipment DM63
155-0056-00 Monolithic integrated circuit Tektronix M042E 155-0056-00 sweep control Val Garuts 26G1 26G2 26G3 314 4701 5B10N 5B12N 7L5 7L12 7L13 7L14 7L18 7S14 5S14N RG501 Telequipment D63 Telequipment DM63
155-0109-00 Monolithic integrated circuit Tektronix M120B 155-0109-00 trigger Gary Vance 5B25N 5B31 5B40 5B42 5B44 7B50A 7B80 7B85 7B87 7B81P 7B90P 7S14 5S14N SC502 SC504