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Tektronix 7A18A Dual-trace plug-in amplifier for the 7800, 7900 and 7100 Series mainframes. Bandwidth - Dc Coupled: 75 MHz (5 mV/div to 5 V/div). Ac Coupled: 10 Hz or less to 75 MHz (5 mV/div to 5 V/div). Deflection Factor - Calibrated: 5 mV/div to 5 V/div in ten steps (1 -2-5 sequence). Accuracy is within 2% with gain adjusted to 10 mV/div. Uncalibrated: Variable continuously between steps to a maximum of at least 12.5 V/div. Input R and C: 1 M-ohm within 2%; 20 pF. Maximum Input Voltage - Dc Coupled: 250 V (dc + peak ac), ac component 500 V p-p maximum, 1 kHz or less. Ac Coupled: 500 V (dc + peak ac), ac component 500 V p-p maximum, 1 kHz or less. Dc Stability - Drift with Ambient Temperature (Line Voltage Constant): 0.01 div/C. Drift with Time (Ambient Temperature and Line Voltage Constant): 0.02 div in anyone minute after one hour warm-up. Displayed Noise - 0.06 div or less. Common-Mode Rejection Ratio (Add, CH 2 Invert) - At least 10:1, dc to 50 MHz. Option 06, Dc Offset - Allows small signals riding on larger signals, such as power supply ripple, to be analyzed. Separate Channel 1 and Channel 2 variable offset controls are concentric with the position controls replacing the identify push-buttons of the standard 7A18A. The ac-dc ground switch of each channel is expanded to accommodate a fourth position for dc offset.
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