Tektronix 323, Instruction Manual

Page: 13 / 170

SECTION 2
OPERATING INSTRUCTIONS
Type 323
Change information, if any, affecting this section will be found at the
rear of the manual.
NOTE
Read the precautions contained in the First-Time
Operation Procedure before operating the Type
323 Oscilloscope.
Introduction:
The following information is contained in this section:
Explanation of exterior controls, connectors and in­
dicators
Accessories
Power Pack Operating Procedure
First-Time Operation
Operator's Check and Adjustment Procedure
Signal Transporting Methods
Probe Adjustment
Miscellaneous Operating Hints
Glossary of Terms
Abreviations and symbols used in this manual are ex­
plained at the beginning of Section 7, Electrical Parts List.
EXPLANATION OF EXTERIOR CONTROLS,
CONNECTORS A N D INDICATORS
continued. If the batteries become suf-
ficently low, the Oscilloscope will stop
operating and the lamp will stop flashing.
Leaving the POWER switch ON after the
batteries have reached this low state may
damage the rechargeable cells. This "low
charge" condition can be differentiated
from equipment failure by applying AC
power for a few minutes with the Power
Pack switch at FULL CHG. Then disconnect
the AC power and check for Oscilloscope
and LOW BATT lamp operation. Flashing
during EXT DC operation indicates that the
power input is below 6.25 V. (Satisfactory
operation can be obtained from external
DC sources which are as low as
6 V.)
Vertical
Controls
VOLTS/DIV Rotary Switch. Selects calibrated vertical
deflection factors from .01 VOLTS/DIV
to 20 VOLTS/DIV. Value indicated ap­
plies only when VARIABLE (VOLTS/DIV)
is at CAL position and X 10 VERT GAIN
is pushed in. When rotated counterclock­
wise to 5 DIV CAL, it selects a 5 division
reference square wave signal for calibration
purposes.
The following controls, connectors and indicators are
contained on, or are accessible through the exterior surfaces
of the Type 323 Oscilloscope, and are intended to be used
during routine oscilloscope operation. All other controls are
contained inside the covers and should be moved only dur­
ing instrument calibration. The names of all Type 323 con­
trols, connectors and indicators are written in capital letters
wherever they appear in the manual. Specifications regard­
ing the controls can be found in Section 1, Specification.
Handle 320° rotation. Detents hold the handle in
any one of the numerous positions through­
out travel arc. Detents automatically un­
lock in response to rotary piessure on
handle.
Front Panel
POWER 2 position slide switch. Interrupts or com­
pletes power circuit between Power Pack
and remaining oscilloscope circuitry. Does
not affect battery charging circuitry.
LOW BATT Indicator lamp. During "battery only"
operation, flashes to indicate that batteries
must be recharged before operation is
VARIABLE Potentiometer. Normally set to CAL posi­
tion. Can be varied to select any deflection
factor between the value selected by the
VOLTS/DIV switch-XlO VERT GAIN com­
bination and at least 2.5 times that
value. Any deflection factor between .001
VOLTS/DIV and 50 VOLTS/DIV can thus
be selected.
INPUT 3-position lever switch. Selects the ver­
tical signal input coupling method as fol­
lows:
AC AC signals; 2 Hz to 4 MHz at
—3 dB limits
GND Grounds the amplifier input
DC
DC to 4 MHz at —3 dB limits
(Upper limit decreases to 2.75
MHz when X 10 VERT GAIN is
employed.)
In addition, the INPUT control provides a
precharge-discharge circuit for the coupling
capacitor. The input coupling capacitor
charges to the DC level of the input sig­
nal in the GND position, and discharges
in the DC position.
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