Tips for measuring capacitance
Temperature (Temp) Measurements [Model 703 only]
Tips for measuri ng frequency
In f requency, the met er is always autoranging.
When disconnecting the input terminals, 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.
15
14
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
appropriat e resistance load. Use t he dc voltage f unct ion to
confirm that the capacitor is discharged.
I n capacit ance, t he Meter is always
a u t o r a n g i n g .
I n 40 nF r ange, t he readings ar e
probably unst able due t o envir on-
mentally induced electrical noise and
f loat ing capacit y of t he t es t leads .
Therefore, directly connect t he object
to be measured to the input terminals.
The met er c omes wi th t emperat ur e
reading in eit her Centigrade or
Fahrenheit preset at the f ac tory. The
reading mode can be c hanged at t he
fact ory only.
The SE LECT function is not available
in Temperature mode.
WA RNI NG - Do not apply
thermocoupl e t o circ uit s ex ceeding
30V rms , 42. 4V peak or 60V dc .
Be sure to insert the banana plug K-t ype
temperat ure bead probe TP7 wit h correct
+ – polari ties. Y ou can als o us e a
t hermocoupl e probe adapt er T P 1 A
(O pt ional purc has e) t o adapt ot her
standard K-type temperature probes.
