2.3 Deactivating Auto Power Off
In order to ext end t he li fe of t he ba tter ies , the devic e swi tche s its elf off aut omat ica lly
approxi mately 15 minutes after it is switched on if no key or change of function has
been activated. The devi ce warns that it i s about t o switc h off by e mitting 3 s eries o f 2
audible be eps and, i f no actio n is take n, then emits a long beep and s witche s itself of f.
When the multimeter switches itself off automatically, it can be restarted in the same
configur a t io n by pr e s si ng the " HOL D" ke y t wi c e. Any o the r ac t io n r es ta r ts t he de vi ce ,
but changes its configurati on.
Automati c swi tching o ff ca n be deac tivat ed by ho lding down t he "Hz", "REL", "MAX
MIN", "R ANGE " or "B a c kli ght " ke y w hi le s w i tc hi ng o n. Reminder : a ut o matic s wi tc hi ng
off is de activate d when the instrument is in the "MAX MI N" mode.
To elimina te the sli ght re si dual drai n of the ba tte ri es i n the s lee p mode , i t i s alw ays
best to s witch the device "OF F ".
2.4 DC current measurement (A
)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he pos s i ble
overvo ltage leve ls are known t o be less t han those o f category III.
The current senso r must not be used at the s a me time as the test pro bes.
The instrument has 2 measurement ranges, selected using the rotary switch (60A and
120A).
Remove the current sensor from its compartment on the back of the device (the test
probes a re stowed i n their ow n compartment.
Switch the instrument on in the 60A or 120A setting.
Let the va lue dis playe d stabi lize and brief ly pre ss the "REL (Z ERO)" ke y to set the
value displayed to zero. It is often necessary to repeat this operation after measuring
strong c urrents .
Place t he se ns o r on t he ca ble as i ndic at e d by the locati ng mar ks (t he s e nso r must be
perpendic ular to the cable on which it is placed), see the figure below.
Read the measurement result (after stabilization).
Display of the "-" s i gn in front of the nu me r ical va lue indicates tha t the value me a sured
is nega tive: the cur rent is f lowing i n the dire ct ion o ppos it e the po lar itie s indi ca ted o n
the sensor.
Note: best result s are obta ined when t he cable i s carefully c entred a nd any near by cables
are held away from it.
- 8 -
2.5 AC current measurement (A
)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he po s s i ble
overvoltage levels are known to be less than those of category III. The c urre nt s ens or
must not be used at the same time as the test probes. The instrument has 2
measurement ranges, selected using the rotary switch (60A and 120A).
Remove the current sensor from its compartment on the back of the device (the test
probes are stowed in their own compartment.
Switch the instrument on in the 60A or 120A setting.
Press the "SEL" key briefly to switch to AC current measurement; the "
" symbol is
displayed instead of "
";
Place t he se ns o r on t he ca ble as indi c at e d by t he loc at i ng mar ks (t he s e nso r mus t be
perpendic ular to the cable on which it is placed), se e the figur e above.
Read the measurement result (after stabilization).
Note: be s t results are obta ined when the cable i s carefully c entred a nd any near by cables
are held away from it.
2.6 DC voltage me asurement (V
)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he po s s i ble
overvoltage levels are known to be less than those of category III. The ins t rument ha s 4
measurement ranges: 660mV, 6,6V, 66V, 600V. The 600 mV ra nge c an be use d only in
the manual range change mode, by repeated presses on the "RANGE" key. The other
ranges can be used in either the manual or the automatic range change mode.
Withdraw the test probes and le ads fro m the ir compart ment.
Switc h t he instrument on in the " V" sett ing.
Apply the meta llic part of the bla ck t est pr obe on t he (ass umed) ne ga ti ve pa rt of the
circuit to be teste d.
Apply the metallic part of the red test pr obe on the (assumed) pos itive part of the
circuit to be teste d.
Read the measurement result (after stabilization).
Display of the "-" s i gn in front of the nu me r ical va lue indicates tha t the value me a sured
is negative (the test probes are reversed with respect to the polarity of the voltage).
2.7 AC voltage me asurement (V
)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he po s s i ble
overvoltage levels are known to be less than those of cat. III. The DMM16 has 4
measurement ranges: 660mV, 6,6V, 66V, 600V.
The 600mV ra nge ca n be used only in the manua l range cha nge mode, by repe ated
presses on the "RANGE" key. The other ranges can be used in either the manual or the
automatic range change mode.
Withdraw the test probes and le ads fro m the ir compart ment.
Switc h t he instrument on in the " V" setti ng.
Press the "SEL" key briefly to switch to AC voltage measurement (the "
" symbol is
displayed instead of "
")
Apply the metallic part of the black test probe on the part of the circuit to be tested
(assumed) closest to the earth potential.
Apply the metallic part of the red test probe on the part of the circuit to be tested
(assumed) farthest from the earth potential.
Read the measurement result (after stab il ization).
- 9 -
2.8 Frequency measurement (Hz)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he po s s i ble
overvoltage le vels are kno wn to be le ss than tho se of cate gory III.
The instrument has 3 measurement ranges: 660,0Hz, 6,600kHz and 66,00kHz.
Measurement of t he frequency of the voltage measured: start the AC voltage
measurement method, then press the "Hz" key (display of the "Hz" symbo l instea d of "V").
Measure ment of the f requenc y of the curr ent be ing mea sured: star t the AC c urre nt
measureme nt met ho d, t hen pre s s the " H z" ke y ( the " H z" s y mbo l i s dis pla y e d i ns t e ad
of "A";
Read the measurement result after stabilization.
2.9 Duty cycle measurement (%)
For optimum safety, current measurements on circuits at voltages between 300V and
600V must be made only on category III installa t i ons o r on c i rcui t s of whi c h t he po s s i ble
overvoltage level s are known to be less tha n t hose of cat egory III.
The measurement range is from 10% to 94.9% (50-60Hz). If there is no usable signal or if
the duty c ycle is less tha n 10%, the display i ndicates "UL", and if the duty cycle is great e r
than 94. 9%, the dis play indicates "OL".
For volt age duty cycle meas urements , the de vice swi tches its elf to t he manual ran ge
change mode.
Measurement of the duty cycle of the voltage being measured: start the AC voltage
measureme nt method, then pre ss the " Hz" key twi ce (the "%" symbol is displaye d
instea d of "V" and "MANU" instead of "AUTO") ;
Measure ment of the dut y cycle of the c urrent being mea sured: star t the AC c urre nt
measureme nt method, then pres s "Hz" twic e ("%" is di splayed instead of "A");
Read the measurement result after stabilization.
2.10 Resi stance measureme nt (Ω)
Resista nce, co ntinuit y, diode test, and capac itance measure ments must be made
only on circuits completely disconnected from any power supply, and after any capacitors
have be e n discharge d.
The instrument has 6 measurement ranges: 660,0Ω, 6,600kΩ, 66,00kΩ, 660,0kΩ,
6,600MΩ and 66,00MΩ.
All of the ranges can be used wi t h either automatic or manual range change.
Withdraw the test probes and le ads fro m the ir compart ment.
Switc h t he instrument on in the "Ω " setting.
Apply the metallic tips of the test probes to the terminals of the resistance or of the
circuit to be teste d
Read the measurement result (after stabilization).
NB: Touching the elements or circuit during the measurement may lead to erroneous
results . For res istance measurements on nonlinear circuits, it may be necessary to select
the measurement mode and the range to be used manually.
- 10 -
2.11 Continuity measurement (Ω)
Resista nce, co ntinuit y, diode test, and capac itance measure ments must be made
only on circuits completely disconnected from any power supply, and after any capacitors
have be e n discharge d.
The instr ument in dicates continuity by emitt ing a ste ady sound w hen the r esista nce
measured is less tha n 50Ω.
The value di splayed is the va lue measure d in ohms.
Withdraw the test probes and le ads fro m the ir compart ment.
Switch the instrument on in the "Ω" setting.
Press t he "SEL" key briefly unt il "
" appears.
Apply the metallic tips of the test probes to the terminals of the resistance or of the
circuit to be teste d.
Read (if necessary) the measurement result (after stabilization).
2.12 Diode measurement (Ω)
Resistance, continuity, di ode tes t, and ca pacitanc e meas urements must be ma de
only on circuits completely disconnected from any power supply, and after any capacitors
have be e n discharge d.
The instr ument indi cates the voltage ac ross the t erminals o f the semico nducting ju nction.
Take out t he test pr o bes and lea ds .
Switc h t he instrument on in the "Ω" setting.
Press t he "SEL" key briefly until the "
" symbol appears
Apply the metallic tips of the test probes to the terminals of the diode or of the junction
to be tes ted, accor ding to the following po lariti e s;
1) for wa rd directi on (conduct ing): apply the blac k probe to the catho de and the red
probe to the anode. Read the measurement result (after stabilization), see figure A
(the thre shold voltage of a s i licon dio de is betwee n 0.5V and 0.7 V; it is be tween 0.2
and 0.3V for a germanium diode. High-voltage diodes, some Zener diodes, and LEDs
cannot be tested by t his metho d) .
2) reverse direction (non-conduct ing): apply the black probe to t he anode and t he red
probe to the cathode. Read the measurement result (after stabilization), see figure B
(a diode or junction in good c onditio n causes t he display of "OL").
With some t ypes of di ode , a meas ured v alue o uts ide t he sta ted v olta ge ra nges does
not neces sarily me a n that the diode or junc tion is de fective .
3. CHARACTER ISTICS
3.1 General conditions