BLACK STAR METEOR 100 User Manual

'100MHz'
selects the 100MHz
range.
Any
signal of sufficient strength
may be
read from
(typically)
lMHz to 100MHz on this
range, but see'Low Frequency
Filter'below.
The signal must be applied to
Input
A
(7).
'Prescaler
-
10'
(Meteor
100
only). This behaves exactly
the same as
100MHz
input, but the decimal
point
is displaced to
the
left
allowing
direct reading
when a decade
prescaler
is
used.
'600MHz'(Meteor
600 only).
This selects the 600MHz
range.
Any
signal
of
sufficient strength
may be read from
40MHz
to
600MHz
on
this
range.
The
signal must be applied to Input B
(6).
This range
may
display
a reading
in
the
absence of an
input
signal. This
is due to exceptional sensitivity, and does
not
affect operation
or
accuracy .
'1GHz'(Meteor
1000 only). This selects
the lGHz
range.
Any signal
of
suf-
ficient
strength
may be
read from
40MHz to lGHz on this range. The signal
must
be
applied
to
Input
B
(6).
This
range
may
also
display readings
in the
ab-
sence of
an
input
signal, which can be disregarded.
GATETIME
Switch
(3)
. This
switch has three
positions.
Note there
is
an
interval,
between
successive measurements. of 200ms.
'0.1s'
selects a
measurement interval of 100ms. Maximum
resolution
10H2.
'1s'
selects
a measurement
interval of
1 second.
Maximum
resolution
1Hz.
'10s'selects
a
measurement
interval of 10 seconds.
Maximum
resolution
0.1H2.
Measurement
is in
progress
while
gate
time LED
(4)
is lit.
LOW
FREOUENCY FITTER
Switch
(8).
This
has two
positions:-
'Out'
by-passes the
filter
circuitry
and
allows
full frequency spectrum on the
5Hz
to
100MHz
input.
'ln'
introduces
a low
pass
single
pole
filter into the 5Hz
to
100MHz
input. This
filter has
a
-3dB
point
of nominally
50kHz
when fed from a low impedance
source
giving
normal sensitivity to audio frequencies, with sensitivity
falling
off
rapidly
above
this.
lt's
purpose
is
to
filter
out
R. F. signals.
When a
wide band-
width instrument
is
connected to
a
high impedance
low-frequency
circuit,
it is
quite
common
for
parts
of
the circuit under
test
to
act as
aerials
for
any
stray
sources
of R.F.
radiation.
Because of the
high
sensitivity of
the
instrument,
these
signals
can
be counted causing errors in the wanted measurement, and
f
iltering
is
the most satisfactory solution.
r,

BLACK STAR METEOR 100 Specifications

General

Brand	BLACK STAR
Model	METEOR 100
Category	Measuring Instruments
Language	English