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Tektronix 5B25N
20 MHz digitizer time base
Tektronix 5B25N front

Compatible with 5000-series scopes

Produced from 1981 to 1988


Manuals – Specifications – Links – Pictures

The Tektronix 5B25N is a "digitizer time base" for the 5223 scope, i.e. a time base that also contains a sample clock generator. It will also operate in 5400-series mainframes as a generic time base. The 5B25N/5223 system uses real-time sampling at sweep rates of 0.1 ms/div or slower. At sweep rates of 50 us/div or faster, equivalent-time sampling is used. The 5B25N uses the 155-0109-01 trigger chip (U95).

Key Specifications

Sweep 200 ns/Div to 5 s/Div, 1—2—5
Triggering > 0.4 Div or 50 mV to 1 MHz, > 0.6 Div or 200 mV to 20 MHz
X-Y mode 50 mV/Div, 180 ns rise time, 2 MHz bandwidth, 1 MΩ // 24 pF input
  • × 10 magnifier
  • Pretrigger adjustment 0-100%


Custom ICs used in the 5B25N

Page Class Manufacturer Model Part nos Description Designers Used in
155-0109-00 Monolithic integrated circuit Tektronix M120B 155-0109-00 155-0109-01 trigger Gary Vance 5B25N 5B31 5B40 5B42 5B44 5S14N 7B50A 7B53A 7B80 7B85 7B87 7B81P 7B90P 7S14 7612D SC502 SC503 SC504