Option 06 (first offered in 1975 catalog) adds offset voltage controls giving ±200 Div offset range. This option replaces the IDENTIFY buttons with DC offset controls and adds a fourth "DC offset" position to the input coupling switch.
The 7A18 uses a discrete front-end followed by M36 channel switch ICs for the vertical and trigger signals.
|Input impedance||1 MΩ // 20 pF|
|Deflection||5 mV/div to 5 V/div in 1–2–5 sequence, 2%|
|Bandwidth||0 – 75 MHz (DC), 10 Hz – 75 MHz (AC)|
|Noise||< 300 μV in 5 mV/Div|
|Option 06 offset range||±200 Div equiv. from ±1 V in 5 mV/Div range up to ±200 V in 1 V/Div range (above that limited by maximum input voltage)|
The pins of the attenuator modules are connected to conductive traces on the ceramic substrate inside by low-temperature soldering, which can go bad. Re-seating the module can temporarily restore the internal contact but will usually not fix the problem permanently. Repair is possible by opening the click-locked lid and carefully resoldering.