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Tektronix 7B90
Programmable Timebase
Tektronix 7B90P front

Compatible with 7000-series scopes

Produced from 1978 to 1989

Manuals – Specifications – Links – Pictures

The Tektronix 7B90P is a digitally programmable 400 MHz time-base plug-in for the digitizing mainframes of the 7000 series. Except for the sweep calibration screwdriver adjustment and the external trigger input terminator switch all other controls are programmable. The local/remote state of the 7B90P is slaved to the local/remote state of the mainframe.


Sweep 10 ns/Div to 500 ms/Div (1-2-5), ×10 magnifier (down to 500 ps/Div), no variable sweep, adjustable and programmable holdoff
Excluded sweep First 10 ns in 79XX programmable mainframes
Trigger Sensitivity PP Auto Mode AC or DC 125 mV or 0.5 Div up to 50 MHz, 375 mV or 1.5 Div up to 400 MHz
Trigger Sensitivity Norm or Single Sweep AC 100 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz
Jitter <100 ps at 400 MHz
Ext. Trigger 1 MΩ // 20 pF Max. 250 V DC+peak AC
Ext. Trigger 50 Ω Max. 1 W
Sweep/Trigger Modes Peak-Peak Auto, Auto, Norm, Single Sweep


The 7B90P is controlled by a Motorola 6800 microprocessor.