7A22: Difference between revisions
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* [http://w140.com/smb/7a22_sm.pdf Tektronix 7A22 Manual (OCR, PDF)] | * [http://w140.com/smb/7a22_sm.pdf Tektronix 7A22 Manual (OCR, PDF)] | ||
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The 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, produced from about 1969 to 2000. | The 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, produced from about 1969 to 2000. Specifications and controls are similar to the [[3A9]] from the 560 series but without current probe input or front panel signal output. | ||
Remarkably, the 7A22's input sensitivity reaches down to 10 μV/div. Bandwidth is 1 MHz, the upper 3dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/div to 10 mV/div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the cost of disabling the 20mv/div and higher ranges. | Remarkably, the 7A22's input sensitivity reaches down to 10 μV/div. Bandwidth is 1 MHz, the upper 3dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/div to 10 mV/div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the cost of disabling the 20mv/div and higher ranges. | ||
Revision as of 17:45, 8 May 2014
The 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, produced from about 1969 to 2000. Specifications and controls are similar to the 3A9 from the 560 series but without current probe input or front panel signal output.
Remarkably, the 7A22's input sensitivity reaches down to 10 μV/div. Bandwidth is 1 MHz, the upper 3dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/div to 10 mV/div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the cost of disabling the 20mv/div and higher ranges.
Applications include audio, biological signals, etc.
An example application is found in Jim Williams' Application Note 124 – see Appendix D for a comparison of differential amplifiers.
Specifications
Pictures
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7A22: 1 kHz, 130 μVp-p triangle, BW=1 MHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=100 kHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=10 kHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=1 kHz
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left side
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left side (with cover)
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right side
