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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.
  • 067-0700-00 is a calibration fixture.






Custom ICs used in the 7D12

Page Class Manufacturer Model Part nos Description Designers Used in
155-0022-00 Monolithic integrated circuit Tektronix M036 155-0022-00 155-0022-01 analog multiplexer Gene Andrews 335 468 2220 2221 2230 7403 7503 7603 7613 7623 7623A 7633 7704 7704A 7834 7844 7854 7912AD 7912HB 7904 R7903 7904A 7934 7A12 7A18 7D12 NT-7000 P7001
155-0090-00 Monolithic integrated circuit Tektronix M059 155-0090-00 155-0090-01 155-0090-02 four-decade counter Mike Metcalf 7D01 7D12 7D15 7B85 7J20
155-0171-00 Monolithic integrated circuit Tektronix M150A 155-0171-00 4-decade counter, latch and D/A converter Mike Metcalf 7B85 7D01 7D12 7D15 7J20