TM 11-6625-2795-14-1
Section 1—475 Service
GENERAL INFORMATION
AND INSTALLATION
Introduction
The 475 Oscilloscope is a 200 megahertz bandwidth
portable instrument designed to operate in a wide range of
environmental conditions. The lightweight, compact
design combines accurate high-frequency measurement
capability and ease of transportation.
The dual-channel, DC-to-200 megahertz vertical
deflection system provides calibrated deflection factors
from 2 millivolts to 5 volts/division. A BW/TRIG VIEW
switch permits limiting the bandwidth of the vertical
system to reduce interference from high-frequency
signals when viewing lower-frequency, low-level signals.
The switch also permits displaying of the signal applied to
the ‘A’ Trigger Generator on the CRT.
sweep to trigger in a stable manner on aperiodic signals or
complex digital words. The horizontal deflection system
has calibrated sweep rates from 0.5 second to 0.01
microsecond/division. A X10 magnifier increases each
sweep rate by a factor of 10 to provide a maximum sweep
rate of one nanosecond per division in the .01 position.
The delayed and mixed sweep features allow the start of B
sweep to be delayed a selected amount from the start of A
sweep to provide accurate relative-time measurements.
Calibrated X-Y measurements can be made with Channel
2 providing the vertical deflection and Channel 1 providing
the horizontal deflection (TIME/DIV switch fully
counterclockwise and VERT MODE switch to CH 2).
Regulated DC power supplies provide stable instrument
performance over a wide range of line voltages and
frequencies. Maximum power consumption of the instru-
ment is approximately 100 watts.
Characteristics
The trigger circuits provide stable sweep triggering to The following instrument specifications apply over an
beyond the 200 megahertz bandwidth of the vertical ambient temperature range of –15°C to +55°C unless
deflection system. Separate controls are provided to otherwise specified.
Warmup time for specified ac-
select the desired mode of triggering for the A and B curacies is 20 minutes. The calibration procedure given in
sweeps. The A sweep can be operated in one of three
Section 6, if performed completely, will ensure the instru-
modes; automatic triggering, normal triggering, or single
ment meets the electrical characteristics listed in this
sweep. A variable trigger holdoff control permits the A
section.
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