Operating Instructions; Introduction; Installation - Tektronix 7B92A Maintenance Manual

INTRODUCTION

The 7B92A Dual Time Base unit provides
normal, delayed, intensified, and alternate sweep
operation for TEKTRONIX 7000-Series Oscilloscopes.
Calibrated sweep rates from 0.2 second to 0.5
nanosecond and triggering to 500 megahertz are
provided. The 7B92A is intended for use with high-
frequency 7000-Series Oscilloscope systems; however,
most 7B92A functions are compatible with all 7000-
Series Oscilloscopes.
Other features
switches, compatibility with
having an alphanumeric readout system, and 0 to 9.8
times continuous sweep delay.
allows continuously variable sweep rates between
calibrated steps. Also, when operating in the AUTO
MAIN TRIGGERING Mode, a bright base line is
displayed in the absence of a trigger signal.
This section describes the operation of the front-
panel controls and connectors, and provides a functional
check and general operating information for this
instrument.
The ALT OFF position, which allows
the Intensified mode of operation, is
applicable to
B060000-above.
REV B, JUN 1978

OPERATING INSTRUCTIONS

include lighted pushbutton
indicator oscilloscopes
A VARIABLE control
NOTE
instruments SN
Fig. 1-1. Location of Variable and Mainframe Selector multi-pin conectors.
The 7B92A is designed to operate in the
horizontal plug-in compartment of the oscilloscope. This
instrument can also be installed in a vertical plug-in
compartment to provide a vertical sweep on the crt.
However, when used in this manner, there are no
internal triggering or retrace blanking provisions, and the
unit may not meet the specifications given in the
Specification section of this manual.
Before proceeding with installation, check the
settings of the Time/Div Variable Selector multi-pin
connector and
connector (see Fig.
Selector determines whether the front-panel Time/Div
VARIABLE control operates in conjunction with the
delaying or delayed sweeps. The Mainframe Selector
adapts the 7B92A to the oscillsocope mainframe being
used. The two mainframe selections are:
1. 7800 and 7900-Series Oscilloscopes.
2. All other 7000-Series Oscilloscopes.
The 7B71 will not delay the 7B92A for
displaying alternating Delaying and
Delayed sweeps. Instead, it causes a
sweep lock-up to occur under the
following conditions; with the 7B71 in
the A
1-1
Section 1-7B92A

INSTALLATION

the Mainframe Selector
1-1). The Time/Div Variable
NOTE
horizontal compartment
multi-pin