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Tektronix 7D12
Digital meter plugin
7D12 with M2 Sample and Hold Module

Compatible with 7000-series scopes

Produced from 1974 to 1986

Manuals – Specifications – Links – Pictures

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.







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 7B85 7D01 7D12 7D15 7J20
155-0171-00 155-0171-00 Monolithic integrated circuit 4-decade counter, latch and D/A converter 7B85 7D01 7D12 7D15 7J20
CA3046 156-0048-00 Monolithic integrated circuit transistor array 7104 7403N 7503 7B53A 7D12 S-52 Telequipment D34 7603 7613 7623 7633