7D11

The Tektronix 7D11 Digital Delay can be used to delay a 7B timebase by a given time up to 1 second in 100 ns increments, or by a number of events (1 to 10⁷ at up to 50 MHz). The selected delay is displayed in the on-screen readout (7 digits). An analog fine delay control can add from 0 to 100 ns in delay mode. The 7D11 has an internal reference oscillator or can accept an external 1 MHz input. The 7D10 is essentially the same but without this oscillator and time delay mode.

Manuals – Specifications – Links – Pictures

For internal triggering, the 7D11 must be operated in the A Horizontal compartment (of a four-bay mainframe) to control the delay mode of a timebase in the B Horizontal compartment. If installed in a vertical compartment, it can display the "delay interval pedestal" as its Y output signal (centered on screen, no position control) and can supply a trigger signal to a timebase in either horizontal compartment. However, since mainframes do not route internal trigger signals to vertical bays, the 7D11 itself must be triggered externally in this case (which is the only possibility to use it in a three-bay mainframe).

Two switches internal to the 7D11 allow the user to enable Z axis modulation and "echo mode" to double the indicated delay, respectively. The latter is provided for radar or TDR applications where the delay time of the reflected pulse is twice the cable delay.

Carlo Infante was project manager, Bob Beville design leader, Bruce Hofer design engineer.

Key Specifications

Delay time	100 ns to 1 s in 100 ns increments (0-100 ns analog fine control)
Events mode	1 to 107 counts controlled by separate Events Start input
Event count or trigger input	max. 50 MHz
Trigger	150 mV to 10 MHz, 500 mV to 50 MHz (0.3 Div / 1 Div respectively for internal triggering); LF REJ 30 kHz, HF REJ 50 kHz
Internal reference	5 MHz +/- 0.5 ppm, drift < 10-7 per month
Jitter	< 2.2 ns or delay * 10-7 (whichever is greater)

Links

• Bruce Hofer, My Years at Tektronix
• Bob Beville, A Chameleon Oscilloscope Career

Documents Referencing 7D11

Document	Class	Title	Authors	Year	Links
Aug 11 1972 7d11 7d15 marketing sales release.pdf	Article	7D11+7D15 Marketing Sales Release		1972	7D11 • 7D15
Tekscope 1972 V4 N6 Nov 1972.pdf	Article	Delaying Sweep Goes Digital	Bob Beville	1972	7D11
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 1974 V6 N1.pdf	Article	Flexible Disc Measurements Simplified by Digital Delay		1974	7D11
Tekscope 1975 V7 N1.pdf	Article	Sweep Delay Today	Dave Dunlap	1975	DD501 • 7D11
7000 Series Digital Plug-In Applications.pdf	Application Note	7000 Series Digital Plug-In Applications		1977	7D10 • 7D11 • 7D12 • 7D13 • 7D14 • 7D15
FastTransitionSlowSweep 7D11 7834.pdf	Application Note	Viewing Fast Transitions at Slow Sweep Speeds		1978	7834 • 7D11
42W-5588.pdf	Application Note	Advanced Triggering Techniques	Roger Ensrud	1984	7A42 • 7D11 • 7D15

Patents that may apply to 7D11

Prices

Year	1973	1980	1986
Catalog Price	$1,475	$2,100	$3,400
In 2023 Dollars	$10,200	$7,800	$9,500

Pictures

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  front

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  left

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  right

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  According to Bob Beville, Garve Beckham did the 7D11 cartoon, a snail sitting on the bits 01011, signifying ‘delay’ and ‘eleven’.

Components