7A14
The Tektronix 7A14 is a 120 MHz current probe amplifier vertical plug-in for 7000 series, intended to be used with passive current probes such as the P6021 and P6022.
The 7A14 is one of the original plug-in modules introduced at the start of the 7000 series in 1969.
In the 7A14, the ring around the input BNC connector that is used to identify ×10/×100 probes on voltage probes serves the purpose of detecting the difference between the P6021 and P6022 probes, and switching in appropriate gain and frequency compensation. The P6021 shorts this ring to ground, directly switching three relays connected to −15 V internally. When connecting a P6019 probe, the ring must also be grounded but the probe connector does not have the matching pin. The 131-0750-00 adapter solves this problem.
The front panel gain control screwdriver adjustment affects gain for either P6021 or P6022, i.e. swapping probes requires re-adjustment.
Key Specifications
| Deflection | 1 mA/Div to 1 A/Div in 1–2–5 sequence |
|---|---|
| Bandwidth | P6021: 25 Hz – 50 MHz (55 MHz in 79xx) |
Links
Internals
The 7A14 uses twelve Tek-made miniature relays that can be a service issue.
The amplifier is an 8-stage discrete differential design. The plug-in contains no integrated circuits.
Prices
| Year | 1969 | 1974 |
|---|---|---|
| Catalog price | $575 | $700 |
| 2021 value | $4,260 | $3,860 |
Pictures
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7A14 front panel
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7A14, left side
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7A14, right side
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