Tektronix 5A20N Instruction Manual page 7

5A20N
OPERATING INSTRUCTIONS
Change information, if any, affecting this section will be found at the rear of this manual.
Introduction
The 5A20N Differential Amplifier Plug-In operates with
a Tektronix 5100N-series oscilloscope system. An under-
standing of the 5A20N operation and capabilities is essen-
tial for obtaining best results. This section of the manual
gives a brief functional description of the front-panel con-
trols and connectors, a familiarization procedure and gen-
eral operating information.
PLUG-IN INSERTION AND REMOVAL
The 5A20N is calibrated and ready for use as it is
received, It can be installed in any compartment of the
5100N-series Power Supply/Amplifier module, but it is
intended for primary use in vertical compartments (the
center and left compartments}. For X-Y operation, the
5A20N may aiso be installed in the horizontal (right} com-
partment (refer to the Oscilloscope System instruction
manual for information on X-Y operation}.
NOTE
The Power Supply/Amplifier module is designed so
that in the absence of DISPLAY ON logic levels from
the vertical plug-ins, it will display the output of the
unit in the left compartment.
To install, align the upper and lower rails of the 5A20N
with the plug-in compartment tracks and fully insert it (the
plug-in panel must be flush with the oscilloscope panel). To
remove, pull the release latch to disengage the SA20N from
the oscilloscope.
CONTROLS AND CONNECTORS
This is a brief description of the function or operation of
the front-panel controls and connectors. More detailed
information is given under General Operating information.
DISPLAY ON Applies and removes logic levels to
the oscilloscope system to enable or
disable plug-in operation. Switch is
functional only when plug-in is
operated in one of the vertical plug-
in compartments.
POSITION Positions display.
BANDWIDTH LIMIT Allows reduction of the upper
bandwidth limit to increase the
signal-to-noise ratio for low-
upper bandwidth limit at either 1
MHz {butten out) or 10 KHz
{button in}.
VOLTS/DIV Volts per major graticule division.
Selects calibrated deflection factors
from 50 UV/Div to 5 V/Div; 16
steps in a 1-2-5 sequence, Knob
skirt is illuminated to indicate
deflection factor, and X10 scaling
of readout is provided automat-
ically when a 10X coded probe is
used.
Variable Voits/Div Provides uncalibrated, continuously
variable deflection factor between
calibrated steps; extends range to
12.5 V/Div.
STEP ATTEN BAL Balances the input amplifier for
minimum trace shift throughout
the VOLTS/DIV gain-switching
range.
AC-DC: Button pushed in selects
capacitive coupling of signal applied
to associated input connector;
button out selects direct coupling
Input Coupling
GND: Disconnects the input signal
and provides ground reference to
the amplifier input stage.
PRE CHG: Both AC-DC and GND
buttons pushed in permits pre-
charging of the coupling capacitor
to the input signal DC level. Release
GND button for measurement.
+ and — Input
Connectors
BNC connectors for application of
external voltage signals. Connector
labeled + indicates that a positive-
going signal will cause upward
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