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7D15 - TekWiki

  • ️Mon Oct 07 1968

The Tektronix 7D15 is a 225 MHz frequency counter plug-in for 7000-series scopes, introduced in November 1972.

The 7D15 is optimized for timing measurements, having a 100 MHz oscillator and interval measurement averaging capability. It has two inputs and can measure frequency, period or time difference.

The front panel uses SMB connectors for arming, clock in/out and reset signals. The arming input for channel A is active-high whereas that for channel B is active-low. When one or both are connected to the scope's delayed gate output, the delayed timebase can be used to select the part of the signal to be counted, e.g. for burst or A-B interval measurements. With this connection, the arming interval is directly visible as the intensified trace in the "A intensified by B" display mode.

When installed in a horizontal plug-in bay, the 7D15 can use the mainframe's trigger signal as its input. In a vertical bay, it can display the gate signal. In "true gate" mode, this is the actual counter gate, however, this has a low repeat rate due to the counter's dead time. The "pseudo gate" mode improves this by showing the gate whenever the arming and trigger conditions are met, whether the counter is active or not. A third mode shows channel B's gate. The gate display signal is also available on a dedicated BNC output that can be routed to a scope input when the 7D15 is installed in a H slot.

Key Specifications

     — Frequency Mode —
Input frequency DC to 225 MHz
Resolution 0.1 Hz min.
     — Period Mode —
Range 10 ns to 105 s, Averaging ×1, ×10, ×100 or ×1000
Resolution 10 ps max.
     — Time Interval Mode —
Range 6 ns to 105 s, Averaging ×1, ×10, ×100 or ×1000
Resolution 0.1 ns usable
     — Frequency Ratio Mode —
Range 10-7 to 104
     — Totalize Mode —
Range 0 to 108 counts
     — Manual Stopwatch Mode —
Range 0 to 105 seconds
     — Inputs CH A + CH B —
Frequency Range DC (AC coupled: 5 Hz) to 225 MHz
Sensitivity 100 mVp-p (from TRIG SOURCE: 0.5 Div)
Max. input 200 V DC linearly derated to 20 V at 200 MHz
Min. pulse width 5 ns
Input impedance 1 MΩ // 22 pF

Links

Documents Referencing 7D15

Document Class Title Year Links
Aug 11 1972 7d11 7d15 marketing sales release.pdf Article 7D11+7D15 Marketing Sales Release 1972 7D11 • 7D15
Tekscope 1972 V4 N5 Sep 1972.pdf Article The Oscilloscope-controlled Counter Neil A. Robin 1972 7D15
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973 7A11 • 7A12 • 7A13 • 7A14 • 7A15A • 7A16A • 7A17 • 7A18 • 7A19 • 7A21N • 7A22 • 7B50 • 7B53A • 7B70 • 7B71 • 7B92 • 7CT1N • 7D11 • 7D13 • 7D14 • 7D15 • 7M11 • 7L12 • 7S11 • 7S12 • 7T11 • 7704A • R7704 • 7904 • R7903 • 7603 • R7603 • 7403N • R7403N • 7313 • R7313 • 7613 • R7613 • 7623 • R7623 • P7001
Tekscope 1975 V7 N5.pdf Article Delayed Gate Aids Oscilloscope Digital Measurements Dave McCullough 1975 7D12 • 7D14 • 7D15 • 7B53A
7000 Series Digital Plug-In Applications.pdf Application Note 7000 Series Digital Plug-In Applications 1977 7D10 • 7D11 • 7D12 • 7D13 • 7D14 • 7D15
AX-3957.pdf Application Note X-Y Displays with Interval Timing for Measuring SOA 1979 7D15 • 7A17
42W-5017.pdf Application Note Increased Measurement Accuracy Using a 7D15 Universal Counter/Timer in any 7000 Series Oscilloscope 1982 7D15
42W-5588.pdf Application Note Advanced Triggering Techniques Roger Ensrud 1984 7A42 • 7D11 • 7D15

Patents that may apply to 7D15

Page Title Inventors Filing date Grant date Links
Patent US 3562464A Cam actuated switch having movable and fixed contacts on circuit board Howard Vollum • Willem H Verhoef • Tony Sprando 1968-10-07 1971-02-09 Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504
Patent US 3584174A Push-button switch apparatus having cam actuated switch contacts and selective illumination means Tony Sprando • Peter S Winkelmann 1969-06-09 1971-06-08 Back-lit switches • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A16P • 7A22 • 7A42 • 7B42N • 7B50 • 7B51 • 7B52 • 7B53A • 7B70 • 7B71 • 7B92 • 7B92A • 7D10 • 7D11 • 7D12 • 7D114 • 7D15 • 7D20 • 7F10 • 7L5 • 7L12 • 7L13 • 7L14 • 7L18 • 7M13 • 7S11 • 7S12 • 7T11 • 067-0587-00 • 067-0587-01 • 067-0587-02 • 067-0587-10
Patent US 3719788A Switch having ganged contacts mounted on opposite sides of circuit board Ken Holland • Tony Sprando 1971-02-04 1973-03-06 465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7D15 • PG506
Patent US 3900711A Electrical contactor assembly for high frequency applications Ken Holland 1974-02-04 1975-08-19 465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7D15 • AM503

Internals

The 7D15 uses a number of Tek-made custom chips. The 155-0086-00, 155-0087-00 and 155-0088-00 legend generators are specific to this plug-in. The 155-0090-00 or 155-0171-00 four decade counter/latch/DAC chips implement the lower six counter digits. For the topmost two digits, the 7D15 employs ECL counters. ECL logic requires a −5 V supply, which a switching regulator (board A8) generates from the −15 V rail.

The 5 MHz signal from the (non-ovenized) internal reference crystal oscillator is divided down to a 1 MHz master clock. Optionally, the 1 MHz can be supplied externally as well. An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements.

Prices

Year 1973 1976 1980 1984 1990
Catalog Price $1,475 $1,600 $2,200 $3,200 $4,400
In 2023 dollars $10,000 $8,500 $8,100 $9,300 $10,200

Pictures

  • 7D15 front

    7D15 front

  • 7D15 left side. Note -5 V switching regulator (board A8) on the far left.

    7D15 left side. Note -5 V switching regulator (board A8) on the far left.

  • 7D15 right side

    7D15 right side

  • Cam switch with contacts on both sides of the PCB

    Cam switch with contacts on both sides of the PCB

  • double-sided switch

    double-sided switch

  • double-sided switch

    double-sided switch

  • double-sided switch, bottom-side contacts

    double-sided switch, bottom-side contacts

  • double-sided switch, through-board pins

    double-sided switch, through-board pins

  • 7D15 powered on

    7D15 powered on

Components

Some Parts Used in the 7D15

Part Part Number(s) Class Description Used in
155-0086-00 155-0086-00 Monolithic integrated circuit custom legend generator 7D15
155-0087-00 155-0087-00 Monolithic integrated circuit custom legend generator 7D15
155-0088-00 155-0088-00 Monolithic integrated circuit custom legend generator 7D15 • 7L13 • 7L14
155-0090-00 155-0090-00 • 155-0090-01 • 155-0090-02 Monolithic integrated circuit four-decade counter, latch and D/A converter 7B85 • 7D01 • 7D12 • 7D15 • 7J20
155-0171-00 155-0171-00 Monolithic integrated circuit four-decade counter, latch and D/A converter 7B85 • 7D01 • 7D12 • 7D15 • 7J20
2N3958 151-1054-00 • 151-1054-01 • 151-1054-02 Discrete component dual n-channel JFET FG503 • MR501 • M3 • PG505 • SC501 • SC502 • SC503 • SG502 • 1450 • 1501 • 1502 • 1503 • 221 • 5A23N • 5CT1N • 577 • 603 • 603A • 604 • 604A • 605 • 606 • 606A • 606B • 607 • 607A • 620 • 624 • 7CT1N • 7D15 • 7D20 • 851