Tektronix 3B2 TIME-BASE Instruction Manual page 5

SECTION I
CHARACTERISTICS
General Information
The Type 3B2 Time Base Unit is used to generate sweeps
for the Type 560-Series oscilloscopes. The sweeps may be
initiated immediately by the trigger pulses or they may be
delayed a selected time (from 5 psec to 10.5 sec) after the
trigger pulses. The unit provides outputs for digital unit
displays as well as the usual analog displays. The unit can
be used with any of the Type 560-Series oscilloscopes except
the Types 560, 565, and RM565.
Sweep Rates
Sweeps from 2 psec/div to 1 sec/div in 18 calibrated
steps. Accurate to —-3%.
Delay Time
A 6-position delay-time switch and precision dial multi-
plier provide sweep delay from 5 usec to 10.5 sec. Ac-
Triggering Modes
Ac slow, ac fast, or de coupled: + or — slope, internal,
line, or external source.
Trigger Signal Requirements
Internal Triggering: Minimum signal amplitude of 2 minor
divisions on the ert.
External Triggering: 0.5-volt minimum signal.
De to 30 me. (Internal trigger frequency limited to 500 kc
when used with Type 3A2 Dual-Trace Amplifier plug-in
Internal Clock
Clock pulses for the digital readout unit are supplied
from a l1-mc crystal-controlled oscillator. Frequency toler-
ance is -+0.01%.
Sweep Gate Out: +15-volt signal.
Delayed Trigger Out: +6-volt pulse = 0.5-ysec width.
Jitter: Less than 1:20,000.
Mechanical
Construction: Aluminum-alloy chassis.
Finish: Photo-etched, anodized panel.
Weight: 5 lbs.
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