Specification; Introduction; Standard Accessories; Recommended Recalibration Schedule - Tektronix 2246 1Y Service Manual

INTRODUCTION

The 2246 1Y and 2246 Mod A are 100 MHz, fou r-
channel, dual-sweep, portable oscilloscopes for
general-purpose use.
operating system controls most of the functions in
each instrument, including a fully integrated m enu-
driven voltage and time measurement system with
SmartCursors®. A menu-driven
provides for configuring of certain menu and readout
displays, internal calibration,
diagnostics. The instruments include additional EMI
shielding. (See Table 1-2, Environmental Character­
istics, for more information.)
The vertical deflection system has four input chan­
nels. Two channels have 11 basic deflection factors
from 2 mV to 5 V per division, and two channels have
two basic deflection factors of 0.1 V and 0.5 V per
division. Basic deflection factors can be extended
with attenuator probes. VOLTS/DIV readouts are
switched to display the correct vertical scale factors
when properly coded probes are connected to the
vertical input connectors.
The horizontal deflection system provides single,
dual, or delayed sweeps from 0.5 s to 20 ns per divi­
sion (delayed sweep, 5 ms to 20 ns per division). The
trigger system provides stable triggering over the full
bandwidth of the vertical deflection system.
Alphanumeric crt readouts of the vertical and hori­
zontal scale factors are displayed at the bottom of the
screen. On-screen vertical and horizontal cursors
provide accurate voltage, time, frequency, and
phase measurements; measurement values are dis­
played at the top of the crt.
The measurement features include voltage measure­
ments for+Peak, -Peak, Peak-to-Peak, and average
DC, or positionable cursors for measuring voltage dif­
ference, time difference, frequency, and phase.
SmartCursors® that visually track voltage measure­
ments, trigger levels, and ground can be placed on
displayed waveforms. Delay-time and delta-delay
measurements for time, frequency, and phase are
available in ALT and B Horizontal Modes.
REV OCT 1991

SPECIFICATION

A microprocessor-based
service mode
and servicing
Section 1 - 2 2 4 6 1Y and 2 2 4 6 M od A Service

STANDARD ACCESSORIES

The following items are standard accessories shipped
with the 2246 1Y and 2246 Mod A instrument:
2 Probes, 10X, 2 meter, with accessories
1 Probe, IX , 2 meter, with accessories
1 Power cord
1 Power cord clamp
1 CRT implosion shield, blue plastic (installed)
1 Fuse, 2A, 250 V, slow-blow
1 Attaching accessory pouch
1 Accessory pouch, ziploc
1 Front cover
The following items are standard accessories shipped
with the 2246 1Y instrument:
2 Operators manuals
2 Service manuals
2 Reference guides
The following items are standard accessories shipped
with the 2246 Mod A instrument:
1 Operators manual
1 Reference guide
RECOMMENDED RECALIBRATION
SCHEDULE
To ensure accurate measurements, check the per­
formance of this instrument every 2000 hours of
operation, or, if used infrequently, once each year.
Replacement of components in the instrument may
also necessitate readjustment
circuits.
NOTE
The silver-oxide batteries
2246 1Y (instruments
B714999 and below) MUST BE REPLACED
AT LEAST EVERY 12 MONTHS to ensure
proper operation of the instrument.
of the affected
used in the
serial numbered
1-1