Zico ZI-6921 User manual

ZI-6921
OPERATING INSTRUCTION
AUTORANGING MULTIMETER
www.zicotech.com

1
SAFETY INFORMATION
The following safety information must be observed to insure
maximum personal safety during the operation at this meter:
Do not use the meter if the meter or test leads look
damaged, or if you suspect that the meter is not
operating properly.
Never ground yourself when taking electrical
measurements. Do not touch exposed metal pipes,
outlets, fixtures, etc., which might be at ground potential.
Keep your body isolated from ground by using dry
clothing, rubber shoes, rubber mats, or any approved
insulating material.
Turn off power to the circuit under test before cutting,
unsoldering, or breaking the circuit. Small amounts of
current can be dangerous.
Use caution when working above 60V dc or 30V ac rms.
such voltages pose a shock hazard.
When using the probes, keep your fingers behind the
finger guards on the probes.
Measuring voltage which exceeds the limits of the
multimeter may damage the meter and expose the
operator to a shock hazard. Always recognize the meter
voltage limits as stated on the front of the meter.
Never apply voltage or current to the meter that
exceeds the specified maximum:

2
SAFETY SYMBOLS
This symbol adjacent to another symbol,
terminal or operating device indicates that
the operator must refer to an explanation
in the Operating Instructions to avoid
personal injury or damage to the meter.
This WARNING symbol indicates a
potentially hazardous situation, which if
not avoided, could result in death or
serious injury.
This CAUTION symbol indicates a
potentially hazardous situation, which if
not avoided, may result damage to the
product.
This symbol advises the user that the
terminal(s) so marked must not be
connected to a circuit point at which the
voltage with respect to earth ground
exceeds (in this case) 500 VAC or VDC.
This symbol adjacent to one or more
terminals identifies them as being
associated with ranges that may, in
normal use, be subjected to particularly
hazardous voltages. For maximum safety,
the meter and its test leads should not be
handled when these terminals are
energized.
Input Limits
Function
Maximum Input
V DC or V AC
600VDC,
600V AC
mA DC/AC
400mA DC/AC
A DC/AC
10A DC/AC (30
seconds max
every 15
minutes)
Frequency,
Resistance,
Capacitance, Duty
Cycle, Diode test,
Continuity
250V DC/AC
Temperature
250V DC/AC
WARNING
CAUTION
MAX
500
V

3
CONTROLS AND JACKS
1. 4000 count Liquid Crystal Display with symbolic signs
2. Function switch
3. 10A (positive) input jack for 10ADC or AC
measurements
4. COM (negative) input jack
5. Positive input jack
6. MODE pushbutton
7. Range pushbutton
8. Data Hold/Back Light pushbutton
9. Relative pushbutton
10. Battery Cover

4
SYMBOLS AND ANNUNCIATORS
Continuity
BAT Low Battery
Diode
DATA HOLD Data Hold
AUTO AutoRanging
AC Alternating Current or Voltage
DC Direct Current or Voltage
SPECIFICATIONS
The instrument
complies with: EN61010-1.
Insulation: Class2, Double insulation.
Overvoltage category: CATIII 600V.
Display: 4000 counts LCD display with
function indication.
Polarity: Automatic, (-) negative polarity
indication.
Overrange: “OL” mark indication.
Low battery indication: The “BAT” is displayed when the
battery voltage drops below the
operating level.
Measurement rate: 2 times per second, nominal.
Auto power off: Meter automatically shuts down
after approx. 30 minutes of
inactivity.
Operating environment: 0 oCto 50 oC(32
o
Fto 122
o
F) at <
70 % relative humidity.
Storage temperature: -20 oCto 60 oC(-4
o
Fto 140
o
F) at
< 80 % relative humidity.
For inside use,
max height: 2000m

5
Pollution degree: 2
Power: One 9V battery , NEDA 1604, IEC
6F22.
Dimensions: 138 (H) x 68 (W) x 37 (D) mm
Weight: Approx.: 210g.
Accuracy is given at 18 oCto 28 oC(65
o
F to 83
o
F), less than
70 % RH
DC Voltage (Auto-ranging)
Range
Resolution
Accuracy
400.0mV
0.1mV
+0.5% of rdg + 2 dgts
4.000V
1mV
+1.2% of rdg + 2 dgts
40.00V
10mV
400.0V
100mV
600V
1V
+1.5% of rdg + 2 dgts
Input Impedance: 7.8M
Maximum Input: 600V dc or 600V ac rms.
AC Voltage (Auto-ranging except 400mV)
Range
Resoluti
on
Accuracy
400.0mV
0.1mV
+1.5%of rdg + 70 dgts
4.000V
1mV
+1.2% of rdg + 3 dgts
40.00V
10mV
+1.5% of rdg + 3 dgts
400.0V
100mV
600V
1V
+2.0% of rdg + 4 dgts
Frequency Range:50 to 400Hz
Maximum Input: 600V dc or 600V ac rms.

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DC Current (Auto-ranging for uA and mA)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.0% of rdg + 3 dgts
4000uA
1uA
+1.5% of rdg + 3 dgts
40.00mA
10uA
400.0mA
100uA
10A
10mA
+2.5% of rdg + 5 dgts
Overload Protection: 0.5A / 250V and 10A / 250V Fuse.
Maximum Input: 400mA dc or 400mA ac rms on uA / mA
ranges, 10A dc or ac rms on 10A range.
AC Current (Auto-ranging for uA and mA)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.5% of rdg + 5 dgts
4000uA
1uA
+1.8% of rdg + 5 dgts
40.00mA
10uA
400.0mA
100uA
10A
10mA
+3.0% of rdg + 7 dgts
Overload Protection: 0.5A / 250V and 10A / 250V Fuse.
Frequency Range: 50 to 400 Hz
Maximum Input: 400mA dc or 400mA ac rms on uA / mA
ranges, 10A dc or ac rms on 10A range.
Resistance (Auto-ranging)
Range
Resolution
Accuracy
+1.2% of rdg + 4 dgts
+1.0% of rdg + 2 dgts
+1.2% of rdg + 2 dgts
+2.0% of rdg + 3 dgts
Input Protection: 250V dc or 250V ac rms.

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Capacitance (Auto-ranging)
Range
Resolution
Accuracy
40.00nF
10pF
+5.0% of rdg + 7 dgts
400.0nF
0.1nF
+3.0% of rdg + 5 dgts
4.000uF
1nF
40.00uF
10nF
100.0uF
0.1uF
+5.0% of rdg + 5 dgts
Input Protection: 250V dc or 250V ac rms.
Frequency (Auto-ranging)
Range
Resolution
Accuracy
5.000Hz
0.001Hz
+1.5% of rdg + 5 dgts
50.00Hz
0.01Hz
500.0Hz
0.1Hz
+1.2% of rdg + 3 dgts
5.000kHz
1Hz
50.00kHz
10Hz
500.0kHz
100Hz
5.000MHz
1kHz
+1.5% of rdg + 4 dgts
10MHz
10kHz
Sensitivity: >8V RMS
Overload protection: 250V dc or ac rms.
Duty Cycle
Range
Resolution
Accuracy
0.1%~99.9%
0.1%
+1.2% of rdg + 2 dgts
Pulse width: >100us, <100ms;
Frequency width: 5Hz –150kHz
Sensitivity: >8V RMS
Overload protection: 250V dc or ac rms.

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Temperature
Range
Resolution
Accuracy
-20
o
C~+760
o
C
1
o
C
+3% of rdg
+5
o
C/9
o
F
-4
o
F~+1400
o
F
1
o
F
Sensor: Type K Thermocouple
Overload protection: 250V dc or ac rms..
Diode Test
Test current
Resolution
Accuracy
0.3mA
typical
1 mV
+10% of rdg + 5 dgts
Open circuit voltage: 1.5V dc typical
Overload protection: 250V dc or ac rms.
Audible continuity
Audible threshold:
Test current: <0.3mA
Overload protection: 250V dc or ac rms.
OPERATION
WARNING: Risk of electrocution. High-voltage circuits,
both AC and DC, are very dangerous and should be
measured with great care.
1.ALWAYS turn the function switch to the OFF position
when the meter is not in use. This meter has Auto OFF
that automatically shuts the meter OFF if 30minutes
elapse between uses.
2.If “OL” appears in the display during a measurement, the
value exceeds the range you have selected. Change to a
higher range.
NOTE: On some low AC and DC voltage ranges, with the

9
test leads not connected to a device, the display may show
a random, changing reading. This is normal and is caused
by the high-input sensitivity. The reading will stabilize and
give a proper measurement when connected to a circuit.
MODE BUTTON
To select Ohm/Diode/Continuity/Cap , DC/AC, Hz/%Duty
RANGE BUTTON
When the meter is first turned on, it automatically goes into
AutoRanging. This automatically selects the best range for
the measurements being made and is generally the best
mode for most measurements. For measurement situations
requiring that a range be manually selected, perform the
following:
1.Press the RANGE button. The “AUTO” display indicator
will turn off.
2.Press the RANGE button to step through the available
ranges until you select the range you want.
3.Press and hold the RANGE button for 2 seconds to exit
the ManualRanging mode and return to AutoRanging.
DATA HOLD BUTTON
The Data Hold function allows the meter to "freeze" a
measurement for later reference.
1. Press the DATA HOLD button to “freeze” the reading on
the indicator. The indicator “HOLD” will be appear in the
display.
2. Press the DATA HOLD button to return to normal
operation.

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Backlight
Press and hold the HOLD key for >1 second to turn on
or off the display backlight function.
Note: The HOLD feature will activate when the Backlight is
turned on. Press the HOLD key again to exit Hold.
RELATIVE BUTTON
The relative measurement feature allows you to make
measurements relative to a stored reference value. A
reference voltage, current, etc. can be stored and
measurements made in comparison to that value. The
displayed value is the difference between the reference
value and the measured value.
1. Perform any measurement as described in the operating
instructions.
2. Press the RELATIVE button to store the reading in the
display and the "REL" indicator will appear on the
display.
3. The display will now indicate the difference between the
stored value and the measured value.
4. Press the RELATIVE button to return to normal
operation.
DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on
the circuit is being switched ON or OFF. Large voltage
surges may occur that can damage the meter.
1. Set the function switch to the V DC position .
2. Insert the black test lead banana plug into the negative
(COM) jack and the red test lead banana plug into the
positive (V) jack.

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3. Touch the test probe tips to the circuit under test. Be sure
to observe the correct polarity (red lead to positive, black
lead to negative).
4. Read the voltage in the display. The display will indicate
the proper decimal point and value. If the polarity is
reversed, the display will show (-) minus before the
value.
AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may
not be long enough to contact the live parts inside some
240V outlets for appliances because the contacts are
recessed deep in the outlets. As a result, the reading
may show 0 volts when the outlet actually has voltage on
it. Make sure the probe tips are touching the metal
contacts inside the outlet before assuming that no
voltage is present.
CAUTION: Do not measure AC voltages if a motor on
the circuit is being switched ON or OFF. Large voltage
surges may occur that can damage the meter.
1. Set the function switch to the V AC position.
2. Insert the black test lead banana plug into the negative
(COM) jack and the red test lead banana plug into the
positive (V) jack.
3. Touch the test probe tips to the circuit under test.
4. Read the voltage in the display. The display will indicate
the proper decimal point, value and symbol (AC, V, etc.).

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DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements on the
10A scale for longer than 30 seconds. Exceeding 30
seconds may cause damage to the meter and/or the test
leads.
1. Insert the black test lead banana plug into the negative
(COM) jack.
2. For current measurements up to 4000
function switch to theA position and insert the red test
lead banana plug into the (A) jack.
3. For current measurements up to 400mA DC, set the
function switch to the mA range and insert the red test
lead banana plug into the (mA) jack.
4. For current measurements up to 10A DC, set the
function switch to the A position and insert the red test
lead banana plug into the 10Ajack.
5. Press the AC/DC button until “DC” appears in the
display.
6. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
7. Touch the black test probe tip to the negative side of the
circuit. Touch the red test probe tip to the positive side of
the circuit.
8. Apply power to the circuit.
9. Read the current in the display. The display will
indicate the proper decimal point, value and symbol.

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AC CURRENT MEASUREMENTS
WARNING: To avoid electric shock, do not measure AC
current on any circuit whose voltage exceeds 250V AC.
CAUTION: Do not make current measurements on the
10A scale for longer than 30 seconds. Exceeding 30
seconds may cause damage to the meter and/or the test
leads.
1. Insert the black test lead banana plug into the negative
(COM) jack.
2. For current measurements up to 4000
3. For current measurements up to 400mA AC, set the
function switch to the mA range and insert the red test
lead banana plug into the (mA) jack.
4. For current measurements up to 10A AC, set the function
switch to the A position and insert the red test lead
banana plug into the 10A jack.
5. Press the AC/DC button until “AC” appears in the display.
6. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
7. Touch the black test probe tip to the negative side of the
circuit. And touch the red test probe tip to the positive
side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display. The display will indicate
the proper decimal point, value and symbol.

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RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to
the unit under test and discharge all capacitors before
taking any resistance measurements. Remove the
batteries and unplug the line cords.
1. Set the function switch to the
cap position.
2. Insert the black test lead banana plug into the negative
(COM) jack and the red test lead banana plug into the
positive jack.
3. Touch the test probe tips across the circuit or part under
test. It is best to disconnect one side of the part under
test so the rest of the circuit will not interfere with the
resistance reading.
4. Read the resistance in the display. The display will
indicate the proper decimal point, value and symbol.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure
continuity on circuits or wires that have voltage on them.
1. Set the function switch to the  cap position.
2. Insert the black lead banana plug into the negative (-)
jack (COM) and the red test lead banana plug into the
positive (+) jack ().
3. Press the MODE button until the symbol appears in
the display.
4. Touch the test probe tips to the circuit or wire you wish to
check.
5. audible signal will sound. The display will also show the
actual resistance.

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DIODE TEST
WARNING: To avoid electric shock, do not test any
diode that has voltage on it.
1. Set the function switch to cap position.
2. Press the MODE button until the symbol appears in
the display.
3. Insert the black test lead banana plug into the negative (-)
jack (COM) and the red test lead banana plug into the
positive (+) jack ().
4. Touch the test probe tips to the diode or semiconductor
junction you wish to test. Note the meter reading
5. Reverse the probe polarity by switching probe position.
Note this reading.
6. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading
shows OL, the diode is good.
B. If both readings show OL, the device is open.
C. If both readings are very small or 0, the device is
shorted.
NOTE: The value indicated in the display during the diode
check is the forward voltage.
FREQUENCY MEASUREMENT
1. Set the function switch to the FREQ position.
2. Insert the black test lead banana plug into the negative (-)
jack (COM) and the red test lead banana plug into the
positive (+) jack (F).
3. Touch the test probe tips to the circuit under test.
4. Read the frequency in the display. The digital reading will
indicate the proper decimal point, symbols (Hz, kHz) and

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value.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to
the unit under test and discharge all capacitors before
taking any capacitance measurements. Remove the
batteries and unplug the line cords.
1.Set the function switch to the  CAP position. (“nF”
and a small value will appear in the display).
2.Insert the black test lead banana plug into the negative (-)
jack (COM) and the red test lead banana plug into the
positive (+) jack (CAP).
Touch the test leads to the capacitor to be tested. The
display will indicate the proper decimal point, value and
symbol.
TEMPERATURE MEASUREMENTS
WARNING: To avoid electric shock, disconnect both test
probes from any source of voltage before making a
temperature measurement.
1. Set the function switch to TEMP.
2. Insert the type K thermocouple probe black test lead
banana plug into the negative COM jack and the red test
lead banana plug into the positive Temp jack..
3. Touch the Temperature Probe head to the part whose
temperature you wish to measure. Keep the probe
touching the part under test until the reading stabilizes
(about 30 seconds).
4. Read the temperature in the display. The digital reading
will indicate the proper decimal point and value.
5. When setting "Celsius" or "Fahrenheit" into initial
state, please remove the battery cover and slip the

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" ℃/℉" switch to the corresponding position.
WARNING: To avoid electric shock, be sure the
thermocouple has been removed before changing to
another measurement function.
REPLACING THE BATTERY
WARNING: To avoid electric shock, disconnect the test
leads from any source of voltage before removing the
battery door.
1. When the batteries become exhausted or drop below the
operating voltage, “BAT” will appear in the right-hand side
of the LCD display. The battery should be replaced.
2. Follow instructions for installing battery. See the Battery
Installation section of this manual.
3. Dispose of the old battery properly.
WARNING: To avoid electric shock, do not operate your
meter until the battery door is in place and fastened
securely.
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test
leads from any source of voltage before removing the
battery door.
1. Disconnect the test leads from the meter.
2. Open the battery door by loosening the screw using a
Phillips head screwdriver.
3. Insert the battery into battery holder, observing the
correct polarity.
4. Put the battery door back in place. Secure with the two
screws.

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WARNING: To avoid electric shock, do not operate the
meter until the battery door is in place and fastened
securely.
NOTE: If your meter does not work properly, check the fuses
and battery to make sure that they are still good and that
they are properly inserted.
REPLACING THE FUSES
WARNING: To avoid electric shock, disconnect the test
leads from any source of voltage before removing the
fuse door.
1. Disconnect the test leads from the meter and any item
under test.
2. Open the fuse door by loosening the screw on the door
using a Phillips head screwdriver.
3. Remove the old fuse from its holder by gently pulling it
out.
4. Install the new fuse into the holder.
5. Always use a fuse of the proper size and value
(0.5A/250V fast blow for the 400mA range, 10A/250V
fast blow for the 10A range).
6. Put the fuse door back in place. Insert the screw and
tighten it securely.
WARNING: To avoid electric shock, do not operate your
meter until the fuse door is in place and fastened securely.