GENERAL DESCRIPTION
The EICO
Model 221
Electronic Volt-Ohm
Meter is o
high quality
VTVM that
is
especially
suited
for
use
in
television, f-m, and
a-m radio ser-
vicing.
Featuring
a
rugged and
easy
reading 4
1/2"
meter, this instrument
provides enti
rely
electronic
measurement of a-c voltage, d-c voltage,
decibels
and
resistance.
Complete overload protection
is
provided electronically on
all
a-c
voltage,
d-c voltage, andohmmeter
ranges.
To eliminate
the
need
for
revers-
ing
the
test leads
on
d-c
voltage measurement (when a negative
d-c
voltage
is
to
be
measured), positive
and negative d~c
positions
have
been
provided
on
the function
switch
.
A zero centering
position
on
the
meter
facilitates
discriminator alignment in
f-m and a-f-c circuits.
This instrument
allows
measurement
of d-c
and
a-c voltages
up
to 1000
volts in five
ranges.
The
d-c voltage range
can be extended to
30,000
volts
with
the EICO Model HVP-1 High
Voltage
Probe.
Another accessory,
the
EICO
Model
P-75
RF Probe extends
the
frequency range
of
the instrument
(20
-
200,000
cps)
to
200 Me.
The
readings on
the
d-c voltage ranges
are accurate
within
3%
and
on
the
a-c
ranges within 5%
of
ful l-scale
(the multiplier
resistors
used are
accu-
rate within
1%).
As
the
input
impedance is
25 megohms on
d-c
and
3
meg-
ohms
on a-c
voltage ranges,
the
current drawn
by the instrument is
negligible,
so
there
is
no
problem
of
error due to
circuit
loading.
A
balanced bridge
circuit maintains constant
accuracy
despite variations in line
voltage.
On the
ohmmeter
ranges,
advantage
is
taken
of the
high sensitivity
of
the
d-c amplifier to provide
resistance
measurements
up
to 1000
megohms
using
only
the
1
1/2
volt
battery.
This feature avoids any
danger
to
delicate
apparatus
that
may be
tested
with the instrument,
since
it eliminates the
high
voltage normally encountered in
high
resistance measuring
circuits.
The user
of
the
instrument
will benefit
from direct
reading
scales,
simple operation,
and the dependable
quality
that
results
from
high
grade
components, and
careful engineering
and
testing in the field.
It
will
prove
to be
an extremely valuable
tool for signal
tracing,
alignment,
for
voltage
and resistance measurements
in television
and radio
receivers,
and for testing
many types
of
electrical equipment.
-
2
-
To Next Page
Loading...
Need help?
General
