Fluke 8012A - Measuring Frequency

APPLICATIONS
Measuring
Frequency
The 1
millisecond Peak MIN MAX mode is
ideal for recording
transients, especially from
intermittant power lines orconnec-
tions.
This
mode can also be used
to measure the
+
and
-
peak
values of sinewaves up
to
about 450 Hz, for
easy
measurement
of both peak line voltage
and
line current measurements of
power supplies and electrical equipment.
The high
accuracy mode
(1
second
response
time) follows the
digital
dis
play
a
nd can be
selected as a
power-on option by
pressing
(umuax
)
while
turning the meter on. This mode has
the
full
accuracy of the
meter and is best for
recording power
supply drift,
line
(mains) voltage changes, or
circuit perfor-
mance while line voltage,
temperature, load,
or
some other
parameter is
being changed. Frequency
Counter
readings are
recorded
only
in
the
high
accuracy mode.
In the MIN MAX
Recording mode,
the true average of all read-
ings taken since
entering
MIN
MAX is
calculated. The average
value
displayed in both
the 100
millisecond and 1 second
modes
is the
mathematical
integral of the
input (within the
response time
and
accuracy specifications of
the
meter).
When
you
display the average,
the
reading rate
slows some-
what in order to
calculate the average of the
accumulated
readings.
24
The
average
reading is useful for smoothing
out unstable or
changing inputs, calculating
power
consumption
(such as
kilowatt hours), estimating
the
percent
of
time a
circuit
is
oper-
ational, or
verifying circuit
performance (or temperature with
the optional 80TK
Thermocouple
Module).
If you want to
record readings only
during
the
duration of
a
particular
test (such as
during
the
frequency response sweep
of
an audio
amplifier, for example), apply the input signal, start
the test (or
sweep
,
in this example), and let the
meter
stabilize.
Nowpress
(mw *w)
,then press
(Hotos>)
,and stop the
testThe min-
imum,
maximum,
and
average
of all readings taken during the
test are now
held in memory.
Momentarily press
(*w»Mx)
to
scroll
to
the reading of
interest. Be
careful: if
you
hold
down
the
O**""**)
for
longer than a second, you
will exit
the MIN MAX Recording
mode and erase the
memory. As
long as
the
rotary switch is
not
turned and the
other
pushbuttons (except REL) are
not
pressed, these
readings will
remain in memory until the battery
dies.
Measuring Frequency
In the Frequency Counter mode,
the frequency display auto-
ranges to one
of
five
ranges: 199.99
Hz, 1999.9 Hz,
19.999
kHz,
199.99
kHz, and
greater that 200 kHz. For frequencies below