7A18
The Tektronix 7A18 is a general-purpose 75 MHz dual-trace vertical plug-in for 7000-series scopes. Model 7A18N is identical except it omits the readout circuits.
Option 06 (first offered in 1975 catalog) adds offset voltage controls giving ±200 Div offset range.
The 200 MHz 7A26 and 400 MHz 7A24 share the same front panel layout and operation.
Key Specifications
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. Option replaces "IDENTIFY" buttons with DC offset controls. Option adds a fourth "DC offset" position to the input coupling switch. |
Features |
|
Weight | 1.4 kg |
Prices
Year | 1971 | 1976 | 1980 | 1984 | 1990 |
---|---|---|---|---|---|
Catalog price | $535 | $615 | $915 | $1,250 | $1,790 |
2014 value | $3,140 | $2,570 | $2,640 | $2,860 | $3,260 |
Pictures
-
7A18A Front
-
7A18A left side. The step attenuators can be seen on the left, the amplifier board on the right.
-
7A18A right side. The circuit boards on top carry the readout circuitry.
-
7A18 attenuator opened. One of the attenuation R/C modules has been unplugged to reveal the switch contacts.
Option 06
-
7A18A Opt.06 Front. AC/GND/DC switches have an extra rightmost "DC Offset" position enabling the offset controls.
-
7A18A Opt.06 left side (rear). Note the two blue 10T-potentiometers for offset voltage adjustment.
-
7A18A Opt.06 - offset controls take the place of the Identify buttons on the standard model.