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Tektronix 7D11
digital delay
7D11 front view

Compatible with 7000-series scopes

Produced from 1972 to 1986

Manuals – Specifications – Links – Pictures

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.

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)



Year 1973 1980 1986
Price $1,475 $2,100 $3,400
In 2022 Dollars $9,300 $7,200 $8,700


Custom ICs used in the 7D11

Page Model Part nos Description Designers Used in
155-0022-00 M036 155-0022-00 155-0022-01 analog multiplexer Gene Andrews 147 148 149 335 468 1430 1441 1461 1900 1910 2220 2221 2230 5223 5403 5440 5441 5443 5444 5A38 7313 7403N 7503 7504 7514 7603 AN/USM-281C 7613 7623 7623A 7633 7704 R7704 7704A 7834 7844 7854 R7912 7912AD 7912HB 7904 R7903 7904A 7934 7A12 7A18 7A18A 7A18N 7B52 7B53N 7D10 7D11 7D12 NT-7000 P7001