7000 Series plug-in interface: Difference between revisions
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'''[[7000-series scopes|Tektronix 7000 series oscilloscope mainframes]]''' have one ([[7912]]) or two vertical plug-in slots, and zero ([[7612D]]), one (7xx3, 7912) or two (7xx4) horizontal plug-in slots. | '''[[7000-series scopes|Tektronix 7000 series oscilloscope mainframes]]''' have one ([[7912]]) or two vertical plug-in slots, and zero ([[7612D]]), one (7xx3, 7912) or two (7xx4) horizontal plug-in slots. | ||
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===Pin group function legend=== | ===Pin group function legend=== | ||
{| cellpadding="4" | |||
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| bgcolor="Pink" | Plugin power | | bgcolor="Pink" | Plugin power | ||
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| bgcolor="LightGreen" | [[7000 series readout system|Readout system]] signals | | bgcolor="LightGreen" | [[7000 series readout system|Readout system]] signals | ||
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| bgcolor="LightBlue" | IEEE-488 bus used in [[7A16P]], [[7A29P]], [[7B90P]], digitizer mainframes; | | bgcolor="LightBlue" | IEEE-488 bus<br /> (used in [[7A16P]], [[7A29P]], [[7B90P]], digitizer mainframes;<br /> data bus bits 1-8 = TS2-TS9 lines) | ||
|} | |} | ||
[[Image:7000 slot pinout.jpg|thumb|400px|left]] | |||
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===Description of signals=== | ===Description of signals=== | ||
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* ''Plugin Mode'' − 5-level signal providing the mainframe with information about the operating mode of a dual-trace or dual-sweep plugin. | * ''Plugin Mode'' − 5-level signal providing the mainframe with information about the operating mode of a dual-trace or dual-sweep plugin. | ||
* ''Ch1/2 Row/Col'' − Analog current inputs to the readout system. Ch1 refers to the first channel within the plugin slot in question and is associated with the readout field on top of the screen. Ch2 is the 2nd channel displayed at the bottom. Row/Current signals accept negative currents in 100 μA steps; typically, plugins contain resistors from time slot signal lines to row/current lines. | * ''Ch1/2 Row/Col'' − Analog current inputs to the readout system. Ch1 refers to the first channel within the plugin slot in question and is associated with the readout field on top of the screen. Ch2 is the 2nd channel displayed at the bottom. Row/Current signals accept negative currents in 100 μA steps; typically, plugins contain resistors from time slot signal lines to row/current lines. | ||
===Notes=== | ===Notes=== | ||
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| Chop || 0-47 Ω || 0 V | | Chop || 0-47 Ω || 0 V | ||
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===Power Supply Load Limits=== | |||
According to the [[7A17]] manual, the total allowed DC power consumption for each plugin is 16.5 W, with individual current limits as shown below. | |||
:{| class="wikitable" | |||
|- | |||
|- | |||
! Supply Rail | |||
! Pin | |||
! Maximum Current | |||
|- | |||
| +5 V || A8 || 500 mA | |||
|- | |||
| +15 V || A18 || 500 mA | |||
|- | |||
| −15 V || B18 || 500 mA | |||
|- | |||
| +50 V || A19 || 100 mA | |||
|- | |||
| −50 V || B19 || 100 mA | |||
|} | |||
|} | |} | ||
Revision as of 10:22, 16 November 2021
Tektronix 7000 series oscilloscope mainframes have one (7912) or two vertical plug-in slots, and zero (7612D), one (7xx3, 7912) or two (7xx4) horizontal plug-in slots.
According to Barrie Gilbert in The Gears of Genius, the 7000 series backplane was largely developed by Les Larson.
The interconnect on either slot type is a 76-pin, 0.1" pitch PCB edge connector. The pinout on vertical and horizontal slots is not identical but compatible to the point that vertical plugins can be installed in horizontal slots and vice versa. However, in that case, some functions may be unavailable − for example, trigger signals are only routed to H slots so a timebase in a V slot must be externally triggered.
Looking into the mainframe from the front panel, "A" pins are left of the connector centerline (on the plug-in PCB's component side) and "B" are on the right (on the plug-in PCB's solder side). Pins are numbered from 1 at the bottom to 38 on the top. In the following table, (H) indicates signals available in horizontal slots only, (H-A) is horizontal slot A, (H-B) is horizontal slot B, and (V) denotes signals available in vertical slots only.
Pin group function legend
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Description of signals
Notes[note 1] Output from H plugins, input on V plugins [note 2] Output from V plugins, unused and terminated 50 Ω to ground in mainframe H slots [note 3] In programmable mainframes, A24 is clamped to not exceed +3 V, indicating to programmable plug-ins to use TS2-TS9 as GPIB lines and a modified readout logic using only TS1 and TS10, with TS1 being active in time slot 1 as in other mainframes, and TS10 being active in each time slot. Programmable plug-ins source at least 100 μA into TS10 (A29) indicating to a programmable mainframe that the alternative time-slot scheme is to be used. [note 4] Not provided by most mainframes (digitizers only?). 7A16P connects B27 to A9, requires −5.2 V on A27. [note 5] According to the 11000-series interface manual, many 7k plug-in units ground pin B21 or connect it to pin A21, and The 7D10, 7D11, 7D14, 7S14, and possibly some others have pin A21 grounded. [note 6] A22 = Busy output from 7D12, 7D15; A22 = Delayed Sweep Gate output for 7B53A with mod. 769G, routed to real panel on 7403 or 7603 scopes with 769H mod. [note 7] B22 = /Hold input to 7D12, 7D15. Mainframe connection or use unclear. [note 8] The plug-in mode is supplied to the mainframe either as a resistor connected to ground (with 5% tolerance), or by supplying a DC voltage (with 0.25 V tolerance):
Power Supply Load LimitsAccording to the 7A17 manual, the total allowed DC power consumption for each plugin is 16.5 W, with individual current limits as shown below.
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Links
- Tektronix 7000-Series Plug-in to Mainframe Interface Manual (PDF)
- Introduction to the 7000 Series Switching and Logic Circuits (Ken Parker, 1970) (PDF,OCR,1MB)
- Kahrs, Interfacing to the Tektronix 7000 series
- 067-0589-00 rigid extender
- 067-0616-00 flexible extender
- John Griessen's flex extender kit / Photo