Section
1
—
DC
502
SECTION
1
OPERATING
INSTRUCTIONS
INTRODUCTION
Description
The
DC
502 550 MHz Frequency Counter measures
frequencies
from 10 Hz to 550
MHz or totalizes events to
10
7 at
a maximum rate of
550
MHz. The DC 502 operates
in
a TEKTRONIX TM 500 Power Module only.
Frequency
measurements are
accomplished using one of
two
BNC
inputs on the front panel. The
DIRECT INPUT
has
a
frequency range of 10 Hz to 110 MHz with a 300 mV
peak-to-peak
sensitivity, selectable attenuators, and an
adjustable
trigger
level
range. The ÷10 PRE-SCALE INPUT
has
a frequency range of 50 MHz to 550 MHz with a
500
mV peak-to-peak sensitivity and a 50 Ω input
impedance.
The same four measurement interval times
are
selectable for each
input.
Front
panel controls reset
the
Counter and provide
Start/Stop
commands
for the
manual totalizing mode of
each
input.
Measurement
display is accomplished with seven-segment
LED's in
a 7-digit
readout.
The decimal point is
automatically
positioned by the MEASUREMENT
INTERVAL
selected,
and leading zeros (to the left of the
most significant
digit or the decimal
point) are blanked.
LED's
indicate when
the
GATE is open,
when the kHz or
MHz
units are displayed, and
when OVERFLOW occurs.
Installation
The
DC
502 is calibrated and ready to use as received.
Referring
to Fig. 1-1, install
the DC 502 into the
Power
Module
and turn on the
power.
Fig.
1-1.
Plug-in
module installation/removal.
1-1
@1
REV. MAY
1974
Summary of Contents for DC 502
Page 4: ...DC 502...
Page 24: ...39 39 Relocated on back of board SN B070000 REV MAY 1974...
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