Tektronix 5T1A Instrument Reference Book page 9

TYPE 4S2 DUAL-TRACE UNIT
O.1-nsec Risetime
2mv/cm to 200 mv/cm Calibrated Sensitivity
+1 volt Dynamic Range
+1 volt DC Offset
Amy noise (unsmoothed, 2 mv smoothed)
The Type 482 Dual-Trace Sampling Unit is a special-
purpose sampling plug-in unit which makes possible a new
degree of time resolution. This latest vertical plug-in unit
retains most features of the general-purpose Type 4S], ex-
cept for delay lines and internal triggering.
Capabilities include those for display of --A only, +B
only, algebraic addition, dual-trace, and an X-Y type dis-
play, of A-vertically and B-horizontally — for observing
hysteresis loops, phase shift, similar displays.
661/5T1A/4S2 CAPABILITIES
DISPLAY 0.1% system discontinuities as retlectometer with
centimeter separation capability (limited by external pulse
generators, delay lines, attenuators).
DISPLAY millivolts of information on top of signals hundreds
of millivolts in amplitude (not limited by the usual amplifier
overload problem).
DISPLAY fastest present switching transistor risetimes, includ-
ing commercially available avalanche types (usually limited
by the transistor or the transistor case).
DISPLAY most tunnel diode switching times. (Only diodes
with better than 3 ma/pf are faster).
DISPLAY stored charge in switching diodes to the 0.01 pico-
coulomb/milliampere region (generally limited by diode ca-
pacity and turn-on capability).
DISPLAY fractions of a degree of relative phase shift to
over 3 gigacycle frequency with lissajous-mode operation
(usually limited by harmonic content or residual reflections
to a few degrees absolute). Over 500Mc, use Type 280
Trigger Count-Down Unit.
INPUT CHANNELS can be viewed in single-trace, dual-
trace, algebraic addition, or X-Y operation. Independent
terminations and controls for each channel permit position-
ing and inverting input signals as desired.
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SMOOTHING CONTROL reduce system time jitter and
amplitude noises, if needed when there is sufficient dot
density.
RISETIME is 0.1 nsec or less, measured from 10% to 90%
amplitude points on an input step. Transient abberations
are within +5%.
FREQUENCY RESPONSE is equivalent to dc-to-3500 Mc.
DEFLECTION FACTOR is in 7 calibrated steps from 2
mv/cm to 200 mv/cm, 1-2-5 sequence, accuracy within 3%.
A variable control permits continuous adjustment uncali-
brated from 200 mv/cm to 0.67 mv/cm.
NOISE LEVEL is less than 4mv_ (tangential noise) un-
smoothed or 2mv smoothed. (Tangential noise is approxi-
mately 3 times the RMS amplitude and is the level "seen"
on sampling oscilloscopes. Only 10% of the random noise
dots are outside this level).
DC-OFFSET through -£1 volt, for signal levels exceeding
"on screen" sensitivity settings, allows utilization of full
sensitivity to display and accurately measure small order
signal discontinuities.
DYNAMIC RANGE is =&1 volt. Full sensitivity can be
used with overloads up to -E1 volt in amplitude. Safe over-
load is +10 volts de (higher with reduced duty factor).
TRIGGERING is external (required 50-nsec prior to signal).
No internal delay lines included. Please refer to Timing
Plug-In Unit specifications.
INPUT IMPEDANCE is 50 ohms. Input connectors are GR
874. Termination is 50-ohm -E1% resistor and approxi-
mately 3 pf.
PROBE POWER is available at the front panel for cathode-
follower probes. See accessory list.
MECHANICAL FEATURES include an aluminum-alloy chas-
sis and anodized front panel. Net weight is 9 pounds.
Shipping weight is 21 pounds, approx.
TYPE 4S2 DUAL-TRACE SAMPLING UNIT .......... $1600
Each instrument includes: 2— 10X 50-{2 attenuators, 2 —
5-nsec 50-2 cables, 2 — instruction manuals.