7D12
The Tektronix 7D12 is an A/D converter (digital meter) plug-in for 7000-series scopes. The A/D converter can be triggered internally (when installed in a horizontal bay), manually by a front panel switch, or externally from a trigger source. The 7D12 will trigger automatically at approximately 4 Hz if set to Auto. It contains a vertical display amplifier that displays the signal being applied to the module and a gate display amplifier that displays a representation of the 7D12 internal gate signal.
The 7D12 accepts plug-in modules M1, M2, or M3.
- M1 is a digital multimeter module with DC voltage, resistance and temperature (with P6058) ranges. It does not produce an analog output signal.
- M2 is a sample and hold module that can measure voltage from ground to a selected point, or the difference voltage between two points defined by a trigger signal. When triggered by the delayed gate signal from a time base, this allows cursor-like measurements to be made. The module has an aperture time of only 10 ns. With repetitive signals, the period between the sampled points can be as short as 30 ns, in single shot mode it must be at least 150 μs.
Input sensitivity is selectable between ±2 V (100/200/500 mV/Div) and ±20 V (1/2/5 V/Div) ranges. The input has a ring to detect a ×10 probe with readout pin (P6055 recommended) and adjusts the display accordingly. Signal bandwidth is 25 MHz. - M3 is a True RMS module with floating inputs. It produces an analog output signal with a 3 dB bandwidth of 700 kHz and vertical sensitivities between 100 mV/Div to 500 V/Div in a 1−2−5 sequence. The RMS converter is implemented with opamps, a dual transistor, and transistors from a CA3046 array.
- 067-0700-00 is a calibration fixture.
Links
Documents Referencing 7D12
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1973 V5 N6 Nov 1973.pdf | Article | A fast A/D plug-in for the oscilloscope | Hideki Iwata • Ken Sternes | 1973 | 7D12 • M1 • M2 • M3 |
| 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 |
Patents that may apply to 7D12
Pictures
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7D12 with M2 Sample and Hold Module
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7D12 with M1, M2 and M3
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7D12 without plug-in, left side
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7D12 without plug-in, right side
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7D12 with M2 plug-in, left side
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7D12 with M2 plug-in, right side
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067-0700-00 calibration plug-in
M1
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M1 plug-in, front
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M1 plug-in, rear
M2
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M2 front
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M2 plug-in, left side
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M2 plug-in, right side
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"Master Sampler" cartoon in schematic
M3
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M3 plug-in, front
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M3 plug-in, rear
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"Least Significant Digit Blanking" cartoon in schematic
Components
Some Parts Used in the 7D12
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 155-0022-00 | 155-0022-00 • 155-0022-01 | Monolithic integrated circuit | analog multiplexer | 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 |
| 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 |
| CA3046 | 156-0048-00 | Monolithic integrated circuit | transistor array | 4601 • 7104 • 7403N • 7503 • 7B53A • 7D12 • DM502 • FG504 • S-52 • Telequipment D34 • 7603 • 7613 • 7623 • 7633 • FG507 • Keithley 227 |