7A18: Difference between revisions
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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 [[7000 series readout system|readout circuits]]. | 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 [[7000 series readout system|readout circuits]]. | ||
Option 06 (first offered in 1975 catalog) adds offset voltage controls giving ±200 Div offset range. | 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 200 MHz [[7A26]] and 400 MHz [[7A24]] share the same front panel layout and operation. | The 200 MHz [[7A26]] and 400 MHz [[7A24]] share the same front panel layout and operation. | ||
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{{Spec | Bandwidth | 0 – 75 MHz (DC), 10 Hz – 75 MHz (AC) }} | {{Spec | Bandwidth | 0 – 75 MHz (DC), 10 Hz – 75 MHz (AC) }} | ||
{{Spec | Noise | < 300 μV in 5 mV/Div }} | {{Spec | Noise | < 300 μV in 5 mV/Div }} | ||
{{Spec | Option 06 offset range | ±200 Div equiv. from ±1 V in 5 mV/Div range up to ±200 V in 1 V/Div range | {{Spec | 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) }} | ||
{{Spec | Features | | {{Spec | Features | | ||
* Mode: CH1 only, CH2 only, Add CH1+CH2, Alternating, Chopped. CH2 can be inverted. | * Mode: CH1 only, CH2 only, Add CH1+CH2, Alternating, Chopped. CH2 can be inverted. | ||
Revision as of 01:00, 3 May 2015
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. This option replaces the IDENTIFY buttons with DC offset controls and adds a fourth "DC offset" position to the input coupling switch.
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) |
| 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
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7A18A Front
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7A18A left side. The step attenuators can be seen on the left, the amplifier board on the right.
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7A18A right side. The circuit boards on top carry the readout circuitry.
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7A18 attenuator opened. One of the attenuation R/C modules has been unplugged to reveal the switch contacts.
Option 06
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7A18A Opt.06 Front. AC/GND/DC switches have an extra rightmost "DC Offset" position enabling the offset controls.
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7A18A Opt.06 left side (rear). Note the two blue 10T-potentiometers for offset voltage adjustment.
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7A18A Opt.06 - offset controls take the place of the Identify buttons on the standard model.
