BLACK STAR METEOR 100 User Manual

t
I
I
INPUTS
Input
signal
levels
should
always be
kept to
the minimum
practicable
as under
certain
circumstances,
especially
when using
Input
A
{7),
mismatches
can
cause
unwanted line reflections
and apparent
frequency
multiplication.
All
BNC sockets
are compatible
with
50Q
plugs.
The
use
of T5rC2plugs
may
give
unreliable
or noisy
connections.
INPUT
IMPEDANCE
The impedance
of Input
A
is nominallylMeshunted
by
30pf.When the Low
Frequency
Filter is in
circuit,
this reduces
to
a
series
combination
of
300eand
1
Onf.
The impedance
of Input
B is nominally
50
a
.
TERMINATION
AND
USE
OF
PROBES
Input
A
-
When measuring
frequencies
over lMHz
with
a
high
impedance
counter, reflections
of
the
signal
can
cause
standing
waves, miscounts
and
possible
damage
to the circuit
under test. To
prevent
this,
use
a
through
ter-
mination
to match
the
input
cable
or,
if
the circuit
under test cannot
stand the
load,
use
a short
(<
16
wavelength)
input
cable.
Use
of
Black Star Passive
Probes is
recommended
as
this
minimises
the
cap-
acitive loading.
The following
are available
as
optional
accessories:
AT-001
-
Xl
probe
for
any signal
up to
1MHz.
The low
capacitance
cable
minimises
circuit loading.
AT-010
-
X10 attenuator
probe
for higher
level signals,
where circuit loading
is
critical
(10M()
input
impedance)
or
for signals
over
1MHz.
No termination is
needed
and the
probe
will
accept
signals
up
to
the
maximum
frequency
of
Inout
A.
AT-110
-
A
switchable
probe
combining the features
of
both.
Input
B
Use 50Qcoaxial
cable
or the
Btack
star KBS
series
of
BNC
coax
Leads
(optional
accessories).
TRIGGER
LEVEL
The
operation
of this
control
(9)
is
analogous
to the Trigger
Level
control
on
an
oscilloscope.
lt only
operates
on
the
5Hz to 10MHz range
and enables
the
threshold
of the
squaring
circuit
to be
moved
to the
positive
or
negative
part
of
the
signal allowing
the
user
to
overcome
miscounts.caused
by
poor
or distorted
input
waveforms,
ringing,
overshoot, noise
etc.

BLACK STAR METEOR 100 Specifications

General

Brand	BLACK STAR
Model	METEOR 100
Category	Measuring Instruments
Language	English