Tektronix 2225, Руководство оператора

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The 2225 Oscilloscope
THE 2225 OSCILLOSCOPE
The TEKTRONIX 2225 Oscilloscope is a rugged, lightweight,
dual-channel, 50-MHz instrument that features a bright, sharply
defined trace on an 80 by 100 mm cathode-ray tube (crt).
Its low-noise vertical system supplies calibrated deflection factors
from 5 mV to 5 V per division at full bandwidth. Using the vertical
magnification feature extends sensitivity to 500 jxV per division—
four times the maximum sensitivity of previous 2200-Series Oscil­
loscopes. This same magnification function permits independent
bandwidth limiting for each channel. With it, a user can limit one
channel’s bandwidth to 5 MHz without affecting the bandwidth of
the other channel.
Stable triggering is achieved over the full bandwidth of the vertical
system. The flexibility and high sensitivity of the trigger system
provide a range of conveniences such as hands-free triggering
with the peak-to-peak automatic mode, independent selection of
TV line and TV field triggering at any sweep speed, single-sweep
triggering, and a variable holdoff control to facilitate triggering on
complex waveforms. Besides having standard AC and DC signal
coupling methods, the 2225 also gives the user the ability to filter
out high-frequency and low-frequency components of the trigger­
ing signal. An external triggering signal or an external Z-axis
modulation signal can be applied via a front-panel connector and
the source-selector switches.
The horizontal system provides calibrated sweep speeds from
0.5 s to 50 ns per division. For greater measurement accuracy, a
magnifier circuit extends the maximum sweep speed to 5 ns per
division. Magnification is selected in three levels— X5, X10, and
X50— and the magnified trace can be displayed either alone or
together with the unmagnified trace. Displaying both the magni­
fied and the unmagnified traces together— called Alternate Mag­
nification mode— lets the user perform types of timing
measurements that previously were only possible on oscillo­
scopes having dual time bases.
VI
2225 Operators