Zico ZI-6940 DMM with Mechanical Protection Instruction Manual

: June 6, 2024
: ZICO

Table of Contents

SAFETY INFORMATION
SAFETY SYMBOLS
SPECIFICATIONS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

OPERATING INSTRUCTION
ZI-6940
www.zicotech.com
DMM with Mechanical Protection

SAFETY INFORMATION

The following safety information must be observed to ensure 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 the 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 acres. such voltages pose a shock hazard.
When using the probes, keep your fingers behind the finger guards on the probes.
Measuring voltage that 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:

Input Limits

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.
WARNING
This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.
CAUTION
This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result in damage to the product.
MAX
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 the 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.
CONTROLS AND JACKS

Large 4000 count Liquid Crystal Display with symbolic signs.
Function switch
COM (negative) input jack.
Positive input jack for DC/AC Voltage, Hz, Ohms, Diode, Continuity, Capacitance, Temperature (℃ or ℉) measurements
uA, mA, current (A) clamp positive input jack for DC or AC measurements.
20A (positive) input jack for 20A DC or AC measurements.
Data Hold and Backlight pushbutton
Relative pushbutton Mode pushbutton.
Mode pushbutton
Power pushbutton.

SYMBOLS AND ANNUNCIATORS

BAT

DATA HOL
AUTO
AC
DC| Continuity
Low Battery
Diode
Data Hold
autoranging
Alternating Current or Voltage
Direct Current or Voltage
---|---

SPECIFICATIONS

The instrument complies with: EN61010-1.
Insulation : Class2, Double insulation.
Overvoltage category: CATII 1000V.
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 o C to 50oC (32oF to 122oF) at < 70 % relative humidity.
Storage temperature: -20o C to 60 o C (-4 o F to 140 o F) at < 80 % relative humidity.
For inside use, max-height: 2000m
Pollution degree : 2
Power: One 9V battery , NEDA 1604, IEC 6F22.
Dimensions: 146 (H) x 66.2 (W) x 41.5 (D) mm
Weight : Approx.: 200g.
Accuracy is given at 18o C to 28o C (65o F to 83o 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
1000V| 1V| +1.5% of rdg + 2 dgts

Input Impedance: 10MΩ.
Maximum Input: 1000V dc or 700V ac rms.
AC Voltage (Auto-ranging)

Range

| Resoluti on|

Accuracy

---|---|---
4.000V| 1mV| +1.2% of rdg + 3 dgts
40.00V| 10mV| + 1.5% of rdg + 3 dgts
400.0V| 100mV
700V| 1V| +2.0% of rdg + 4 dgts

Input Impedance: 10MΩ.
Frequency Range:50 to 400Hz
Maximum Input: 1000V dc or 700V ac rms.
DC Current (Auto-ranging for us, mA, A)

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
4A| 1mA| + 2.5% of rdg + 5 dgts
20A| 10mA

Overload Protection: 0.5A / 250V and 20A / 250V Fuse.
Maximum Input: 400mA dc or 400mA ac RMS on uA /mA ranges, 20A dc or ac rms on 4A, 20A range.
AC Current (Auto-ranging for us , mA, A)

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
4A| 1mA| + 3.0% of rdg + 7 dgts
20A| 10mA

Overload Protection: 0.5A / 250V and 20A / 250V Fuse.
Frequency Range: 50 to 400 Hz
Maximum Input: 400mA dc or 400mA ac RMS on uA / mA ranges, 20A dc or ac rms on 4A, 20A range.
Resistance (Auto-ranging)

Range

| Resolution|

Accuracy

---|---|---
400.0W| 0.1Ω| + 1.2% of rdg + 4 dgts
4.000kW| 1Ω| + 1.0% of rdg + 2 dgts
40.00kW| 10Ω| + 1.2% of rdg + 2 dgts
400.0kW| 100Ω
4.000MW| 1kΩ
40.00MW| 10kΩ| + 2.0% of rdg + 3 dgts

Input Protection: 250V dc or 250V ac rms.
Capacitance (Auto-ranging)

Range

| Resolution|

Accuracy

---|---|---
40.00nF| 10pF| +5.0% of rdg + 7 dgts
400.0nF| 0.1nF|
4.000uF| 1nF| + 3.0% of rdg + 5 dgts

+ 3.0% of rdg + 5 dgts

---|---|---
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

---|---|---
9.999Hz| 0.001Hz| + 1.5% of rdg + 5 dgts
99.99Hz| 0.01Hz
999.9Hz| 0.1Hz| + 1.2% of rdg + 3 dgts
9.999kHz| 1Hz
99.99kHz| 10Hz
999.9kHz| 100Hz
9.999MHz| 1kHz| +1.5% of rdg + 4 dgts

Sensitivity: 0.5V RMS min. while ≤1MHz ;
Sensitivity: >3V RMS while >1MHz ;
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: >0.5V RMS
Overload protection: 250V dc or ac rms.
Clamp DC Current

Range

| Resolution|

Accuracy

---|---|---
400A| 0.1A| + 1.0% of rdg + 3dgts (meter only, Clamp-on Adaptor accuracy not included)

Sensor: Clamp-on Adaptor (Note: not provide)
Overload protection: 250V dc or ac rms..
Clamp AC Current

Range

| Resolution|

Accuracy

---|---|---
400A| 0.1A| + 1.5% of rdg + 3dgts (meter only, Clamp-on
Adaptor accuracy not included)

Sensor: Clamp-on Adaptor (Note: not provided)
Frequency Range: 50 to 400 Hz
Overload protection: 250V dc or ac rms..
9V Battery test

Range

| Resolution|

Accuracy

---|---|---
9V| 10mV| + 1.0% of rdg + 3dgts

Test current: 6mA
Overload protection: 250V dc or ac rms..
Temperature

Range

| Resolution|

Accuracy

---|---|---
-20oC~+760oC| 1 oC| + 3% of rdg + 3dgts
-4 oF~+1400 oF| 1oF

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 digits

Open circuit voltage: 1.5V dc typical
Overload protection: 250V dc or ac rms.
Audible continuity
Audible threshold: Less than50Ω,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.

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 15 minutes elapse between uses.
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 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 elect DC/AC Voltage, Resistance/ Diode/Continuity or DC/AC current
DATA HOLD AND BACKLIGHT BUTTON
The Data Hold function allows the meter to “freeze” a measurement for later reference.

Press the DATA HOLD button to “freeze” the reading on the indicator. The indicator “HOLD” will appear in the display.
Press the DATA HOLD button to return to normal operation. 3. Press the HOLD button for 2 seconds to BACKLIGHT button it will turn on or off)

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.

Perform any measurement as described in the operating instructions.
Press the RELATIVE button to store the reading in the display and the “REL” indicator will appear on the display.
The display will now indicate the difference between the stored value and the measured value.
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.

Set the function switch to the V DC position (“mV” will appear in the display).
Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into the positive (V) jack.
Touch the test probe tips to the circuit under test. Be sure to observe the correct polarity (red leads to positive, black leads to negative).
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.
Press the MODE button until “DC” appears in the display.

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.

Set the function switch to the V AC position.
Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into the positive (V) jack.
Touch the test probe tips to the circuit under test.
Read the voltage in the display. The display will indicate the proper decimal point, value and symbol (AC, V, etc.).
Press the MODE button until “AC” appears in the display.

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.

Insert the black test lead banana plug into the negative (COM) jack.
For current measurements up to 4000ΩA DC, set the function switch to the ΩA position and insert the red test lead banana plug into the (ΩA) jack.
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.
For current measurements up to 20A DC, set the function switch to the A position and insert the red test lead banana plug into the 10A jack.
Press the MODE button until “DC” appears in the display.
Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.
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.
Apply power to the circuit.
Read the current in the display. The display will indicate the proper decimal point, value and symbol.

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.

Insert the black test lead banana plug into the negative (COM) jack.
For current measurements, up to 4000µA AC set the function switch to the µA position and insert the red test lead banana plug into the (µ A) jack.
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.
For current measurements up to 20A AC, set the function switch to the A position and insert the red test lead banana plug into the 10A jack.
Press the MODE button until “AC” appears in the display.
Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.
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.
Apply power to the circuit.
Read the current in the display. The display will indicate the proper decimal point, value and symbol.

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.

Set the function switch to the position.
Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into the positive  jack.
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 nterfere with the resistance reading.
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.

Set the function switch to the position.
Insert the black lead banana plug into the negative (-) jack (COM) and the red test lead banana plug into the positive (+) jack (Ω).
Press the button until the symbol appears in the display.
Touch the test probe tips to the circuit or wire you wish to check.
If the resistance is less than approximately 30Ω, the audible signal will sound. The display will also show the actual resistance.

DIODE TEST
WARNING: To avoid electric shock, do not test any diode that has voltage on it.

Set the function switch to position.
Press the button until the symbol appears on the display.
Insert the black test lead banana plug into the negative (-) jack (COM) and the red test lead banana plug into the positive (+) jack ().
Touch the test probe tips to the diode or semiconductor junction you wish to test. Note the meter reading
Reverse the probe polarity by switching the probe position. Note this reading.
The diode or junction can be evaluated as follows:
A. If the one reading shows 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

Set the function switch to the FREQ position.
Insert the black test lead banana plug into the negative (-) jack (COM) and the red test lead banana plug into the positive (+) jack (F).
Touch the test probe tips to the circuit under test.
Read the frequency in the display. The digital reading will indicate the proper decimal point, symbols (Hz, kHz) and 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.

Set the function switch to the CAP position. (“nF” and a small value will appear in the display).
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.

If you wish to measure temperature in F, set the function switch to the oF rance. If you wish to measure temperature in the oC range.
Insert the Temperature Probe into the negative (-) jack (COM) and the positive (+) jack (Temperature), making sure to observe the correct polarity.
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).
Read the temperature in the display. The digital reading will indicate the proper decimal point and value.

WARNING: To avoid electric shock, be sure the thermocouple has been removed before changing to another measurement function.
BATTERY TEST

Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive V jack.
Select the 9V BAT position using the function select switch.
Connecting the red test lead to the positive side of the 9V battery and the black test lead to the negative side of the 9V battery.
Read the voltage in the display.

| Good| Weak| Bad
---|---|---|---
9V battery:| >8.2V| 7.2 to 8.2V| <7.2V

CLAMP CURRENT TEST

Insert the clamp–on adaptor black banana plug into the negative COM jack and the clamp–on adaptor red banana plug into the positive uA, mA. A jack.
Select the clamp current DC or AC position using the function select switch.
Press the trigger to open the jaw. Fully enclose one conductor to be measured.
The meter LCD will display the reading.

REPLACING THE BATTERY
WARNING : To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery door.

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.
Follow instructions for installing the battery. See the Battery Installation section of this manual.
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.

Disconnect the test leads from the meter.
Open the battery door by loosening the screw using a Phillips head screwdriver.
Insert the battery into the battery holder, observing the correct polarity.
Put the battery door back in place. Secure with the two screws.

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.

Disconnect the test leads from the meter and any item under test.
Open the meter cover by loosening the screw on the cover using a Phillips head screwdriver.
Remove the old fuse from its holder by gently pulling it out.
Install the new fuse into the holder.
Always use a fuse of the proper size and value (0.5A/250V fast blow for the 400mA range, 20A/250V fast blow for the 10A range).
Put the cover. Insert the screw and tighten it securely.

WARNING: To avoid electric shock, do not operate your meter until the meter cover is in place and fastened securely.