Tektronix 7A22

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The Tektronix 7A22 vertical plug-in is a DC coupled differential amplifier with excellent common-mode rejection characteristics and high gain for low level applications. It is designed for use in Tektronix 7000 Series oscilloscopes.

The DC offset capability of the 7A22 allows the display of very small low-frequency signals containing a large DC component, at deflection factors not possible with AC coupling. The vertical deflection range of the 7A22 is from 10 µV to 10 V. The high and low frequency -3 dB points can be selected at the front panel to set the bandwidth of the instrument. This means that for low frequency applications, the signal-to-noise ratio can be improved by restricting the bandwidth of the 7A22. The bandwidth selection and excellent drift-with-time characteristics are ideal for applications that require stable, low deflection factor, and low noise measurements.

• Minimum deflection factor: 10 µV/div
• Gain ratio accuracy: Within 2% with Gain adjusted at 1 mV/div
• Gain: Permits adjustment of deflection factor at 1 mV/div
• Differential signal range (no DC offset)
  • 10 µV/div to 10 mV/div: At least ±1 V
  • 20 mV/div to 0.1 V/div: At least ±10 V
  • 0.2 V/div to 1 V/div: At least ±100 V
  • 2 V/div to 10 V/div: At least ±1000 V
• DC offset coarse range from electrical zero
  • 10 µV/div to 10 mV/div: At least +1 V to -1 V
  • 20 mV/div to 0.1 V/div: At least +10 V to -10 V
  • 0.2 V/div to 1 V/div: At least +100 V to -100 V
  • 2 V/div to 10 V/div: At least +1000 V to -1000 V
• Frequency response (8 div reference)
  • Overall frequency response DC coupled input: DC to within 10% of 1 MHz at -3 dB
  • AC coupled input lower bandwidth frequency: 2 Hz or less
• Maximum input voltage, DC coupled, DC + Peak AC, AC component ≤1 MHz
  • 10 µV/div to 10 mV/div: ±15 V
  • 20 mV/div to 0.1 V/div: ±200 V
  • 0.2 V/div to 10 V/div: ±500 V
• Maximum input voltage (AC coupled input DC voltage): ±500 V
• Input R and C
  • Resistance: 1 MΩ ±1%
  • Capacitance: ~47.0 pF
• Maximum input gate current
  • 10 µV/div to 10 mV/div: ±20 pA ±100 pA each input, ±40 pA ±200 pA differentially
  • 20 mV/div to 10 V/div: ±10 pA ±20 pA
  • Display shift at 10 µV/div (AC coupled): ±4 div ±20 div
• Displayed noise: 16 µV or 0.1 div, whichever is greater (1 MHz HF -3 dB point, source resistance 25 Ω or less 
• DC drift with time
  • Short term: 5 µVp-p or 0.1 div, whichever is greater, in any minute after 1 hour warmup
  • Long term:  10 µVp-p or 0.1 div, whichever is greater, in any hour after 1 hour warmup
• DC drift with ambient termperature: 50 µV/°C or less
• Isolation between + and - inputs: At least 200:1, DC to 1 MHz