17
18
19
20
interference. Some random digits on display but have not effect
on result of measurement.
3. At millivoltage measurement mode in order to obtain DC+AC
function, the input terminal of ADC do not employed coupling
capacitor. There for please never apply more than the double dc
or ac voltage of the rated value of this range.
l
AC/DC millivoltage measurement
The measurement of millivoltage has three modes : DCmV / [ACmV+Hz] / dBm.
1.
Set the rotary switch to “ mV ” position.
2.
Press SELECT to select measurement mode.
3.
Connect the black test lead to “COM” terminal and the red test lead to “V
V
Hz” terminal.
4.
According to your need, can press REL
r
MAX / MIN and 2nd VIEW buttons obtain relevant
measurement.
5.
Touch the probes to the test points and reading display.
6.
Primary and secondary display as Table 7.
Table 7. primary and secondary display
Press
Secondary
SELECT
Primary
[ press 2nd VIEW ]
DCmV
DCmV
[ACmV + Hz ]
ACmV
Hz/
%/
%/
ms/
ms
dBm
dBm
Hz/ACmV/DCmV/[DCmV+ACmV]
Note :
1. When enter to dBm measurement, the impedance is 600
V
,
if you want change impedance, press RANGE to select impedance.
The impedance selectable is :
4/8/16/32/50/75/93/110/125/135/150/200/250/300/500/600/800/
900/1000/1200 of Ohms.
2. At millivoltage mode the input impedance more than 1000
M
V
, therefore at test leads opening state input easy caused
Figure 7. mV measurement
Warning For Current measurement
To avoid damage to meter or injury, if the fuse blows. Never attempt an in-circuit current measurement.
Where the open-circuit potential to earth is greater than 1000V. To avoid damage to the meter, check the
meter’s fuses before proceeding. Use the proper terminals, function and range for your messurement.
Never place the probes in parallel with a circuit or component when the leads are plugged into the current
terminals.Never test voltage when test lead plug in “mA” or “10A” terminal !
Warning to wrong operation when probes are plugged in to the “mA” or “10A” terminal and the rotary
switch is not at “ mA ” or “ A ” position, meter will beeper warning to wrong operation until rotary
switch at right position or probes pull out “mA” or “10A” terminals.
l
AC/DC milliampere current measurement
The measurement of milliampere has four modes : DCmA / ACmA /
[DC mA + ACmA] / [ACmA + Hz].
1.
Set the rotary switch to “ mA ” position.
2.
Press SELECT to select measurement mode.
3.
Connect the black test lead to “COM” terminal and the red test
lead to “mA” terminal.
4.
According to your need, can press REL
r
MAX / MIN buttons
obtain relevant measurement. Turn off power to the circuit, discharge
all high-voltage capacitors.
5.
Break the circuit path to be tested. Touch the black test lead
to more negative side of the break; Touch the red test lead to the
more positive side of the break.
Figure 8. mA Current
measurement
6.
Turn on power to the circuit, then read the display.
7.
Primary and secondary display as Table 8.
8.
Turn off power to the circuit and discharge all high-voltage
capacitors. Remove the meter and restore the circuit to normal
operation. Pull out the red test lead from “mA” terminal.
Table 8. primary and secondary display
Press
Secondary
SELECT
Primary
[ press 2nd VIEW ]
DCmA
DCmA
ACmA
ACmA
DCmA+ACmA
DCmA+ACmA
ACmA
ACmA+Hz
ACmA
Hz
l
AC/DC Ampere current measurement
The measurement of ampere current has four modes : DCA /
ACA / [DCA+ACA] / ACA+Hz
1.
Set the rotary switch to “ A ” position.
2.
Press SELECT to select measurement mode.
3.
Connect the black test lead to “COM” terminal and the red
test lead to “10A” terminal.
4.
According to your need, can press REL
r
MAX / MIN
buttons obtain relevant measurement.
Figure 9. Ampere current
measurement
