Tektronix DC 502

DC 502
CONTROLS AND CONNECTORS
MHZ and kHz Units
Indicators
LED indicates that readout
displayed number should
be multiplied by 10 6
(MHz) or 103 (kHz).
Gate Indicator
Display Readout
LED readout, seven 7-
segment digits with auto 
matically placed decimal
point. The leading zeroes
are suppressed unless an
overflow is indicated.
Overflow Indicator
LED indicates overflow of f
leading digits when readout
attempts to display more
than seven digits.
DISPLAY Time Control
Variable control concentric
with MEASUREMENT IN 
TERVAL switch sets the,
length of time the reading
will be displayed after the
count is made and before
the next measurement is
taken. Display time can be
varied from 0.1 second
(MIN) to about 10
seconds. HOLD position
(clockwise) provides con 
tinuous display until reset
by pressing the RESET
button.
÷ 10 pre - scale input
Connector
Lights during the active
gating interval.
RESET Pushbutton
Manual Gate Pushbutton
ATTEN Pushbuttons
MEASUREMENT
INTERVAL Switch
Two buttons select X1,
X5, X10, or X50 attenua 
tion of the input signal.
Selects one of four gate
times from the internal
time-base clock (10 s, 1s,
.1 s, ,01s), or selects
MANual gate, for either
the DIRECT INPUT or the
÷ 10 PRE-SCALE INPUT.
Manually resets the
counter to zero, initiates a
new count when not in
manual-gate mode, and
provides a segment check
of the 7 readout digits.
Operable when MANual is
selected by the
MEASUREMENT INTER 
VAL switch. Button in
starts the measurement
interval gate; button out
terminates the gate.
DIRECT INPUT
Connector
BNC connector for signal
inputs to pre-scaling cir 
cuitry.
TRIGGER LEVEL
Control
BNC connector for signal
inputs to the attenuators
and direct-counting cir 
cuitry.
Selects the amplitude point
on the DIRECT INPUT
signal at which the trigger 
ing window is placed.
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