Tips for
measuring capacitance
Temperature (Temp) Measurements [Model 703 only]
Tips for measuring frequency
In frequency, the meter is always
autoranging.
When disconnec
t
ing the input
t
erminals
,
the overload sign may be displayed or
the display may unsteadily
fluctuate. This is typical.
Duty Cycle Measurements
Duty Cycle (or Duty Factor) is the percentage of time a signal is above or below a
trigger level during one cycle.
The duty cycle mode is optimized for measuring the ON or OFF time of logic and
switching signals. Systems such as electronic fuel injection systems and switching
power supplies are controlled by pulses of varying width, which can be checked by
measuring duty cycle.
Press the Hz/Duty button to toggle between the Hz mode and the Duty Cycle mode
when the rotary selector knob is set to Hz (Duty), , , , or .
Capacitance Measurements
Capacitance is the ability of a component to store an electrical charge.
The unit of capacitance is the farad (F). Most capacitors are in the nanofarad (nF)
to microfarad (µF) range.
The available capacitance ranges are 40nF, 400 nF, 4 µF, 40 µF, and 100 µF.
1514
Caution
To avoid damaging the meter or
the equipment under test,
remove all power from the circuit and discharge all high-
voltage capacitors before measuring capacitance.
Large value capacitors should
be discharged through an
appropriate resis
t
ance load. Use the
dc voltage
function
to
confirm that the capacitor is discharged.
In capacitance,
the Meter is always
a u t o r a n g i n g .
In 40 nF r ange, the readings ar e
probably unstable due to envir on-
mentally induced elec
t
rical noise and
floating capacity of
the tes t leads.
Therefore
,
directly connect the object
to be measured
t
o the input
terminals.
The meter c omes wi th temperatur e
reading in either Cen
t
igrade or
Fahrenheit
preset at
t
he fac
t
ory. The
reading mode
can be changed a
t
the
f
actory only.
The SELECT func
t
ion is
not available
in Temperature
mode.
WARNING - Do
not apply
thermocoupl e to circ uits ex ceeding
30V rms , 42.4V peak or 60V dc .
Be
sure
to insert the banana plug K-type
temperature
bead probe TP7
with correct
+ – polari
t
ies.
You can als o us e a
thermocoupl e probe adapter T P1 A
(O ptional purc hase) to adapt other
standard K-
t
ype temperature
probes.
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