Major tech MT957 User manual

INSTRUCTION MANUAL
LCR Meter
MT957

SAFETY INFORMATION
The following safety information must be observed to insure maximum
personal safety during the operation of this meter:
Ÿ Do not use the meter if the meter or test leads look damaged, or if
you suspect that the meter is not operating properly.
Ÿ 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.
Ÿ Turn off power to the circuit under test before cutting, unsoldering,
or breaking the circuit. Small amounts of current can be dangerous.
Ÿ Use caution when working above 60V DC or 30V AC RMS, such
voltages pose a shock hazard.
Ÿ When using the probes, keep your fingers behind the finger guards
on the probes
Ÿ 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.
Ÿ Never apply voltage or current to the meter that exceeds the
specified maximum:
Function Maximum Input
Resistance, Capacitance, Diode test,
Continuity
Inductance
600V DC/AC
600V DC/AC
Input Limits

Safety
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 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.
Equipment is protected by double or reinforced
insulation
MAX
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.
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.

Controls and jacks
1. 11000 count Liquid Crystal Display
2. Function switch
3. Positive input jack for inductance
measurements
4. Negative input jack for inductance
measurements
5. Positive input jack
6. COM (Negative) input jack.
7. Diode pushbutton
8. RANGE pushbutton
9. HOLD pushbutton
10. MAX/MIN pushbutton
11. Relative Zero pushbutton
12. Backlight pushbutton

Symbols and Annunciators
Continuity
Low Battery
Diode
HOLD Data Hold
AUTO Auto Ranging
MANUAL Manual Ranging
SPECIFICATIONS
The instrument
complies with: EN61010-1
Insulation: Class 2, Double insulation
Overvoltage
category: CATIII 600V
Display: 11000 counts LCD display with function indication.
Polarity: Automatic, (-) negative polarity indication.
Overrange: “OL” mark indication.
Low battery
indication: The “ ” is displayed when the battery
voltage drops below the operating level.
Measurement
rate: 4 times per second, nominal.
Auto power off: Meter automatically shuts down after
approx. 15 minutes of inactivity.
Operating
environment: 0 °C to 50 °C (32 °F to 122 °F) at < 70 % relative
humidity.
Storage
temperature: -20 °C to 60 °C (-4 °F to 140 °F) at < 80 %
relative humidity.

For inside use,
max height: 2000m
Power: One 9V battery , NEDA 1604, IEC 6F22.
Dimensions: 150 (H) x 70 (W) x 48 (D) mm
Weight: Approx.: 255g.
Accuracy is given at 18 °C to 28 °C (65 °F to 83 °F), less than 70 % RH
Resistance
AccuracyRange
110.0Ω
1.1000kΩ
11.00kΩ
1100.0kΩ
1.1000MΩ
11.000MΩ
40.00MΩ
Resolution
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
1kΩ
10 kΩ
±1.2% of rdg ± 0.5Ω
±1.2% of rdg ± 10 dgts
±2.5% of rdg ± 10 dgts
Maximum Input: 600V DC or 600V AC RMS
Capacitance (Auto-ranging)
AccuracyRange
11.000nF
110.00nF
1.1000uF
Resolution
1pF
10pF
100pF
±5.0% of rdg ±0.7nF
±5.0% of rdg ± 15 dgts
11.000uF
110.00uF
1.1000mF
1nF
10nF
0.1uF
11.000mF 1uF
±3.0% of rdg ± 10 dgts
110.00mF 10uF ±10.0% of rdg ± 10 dgts
Maximum Input: 600V DC or 600V AC RMS.

Inductance (Manual-ranging)
AccuracyRange
11.000mH
110.00mH
11.000H
Resolution
1uH
10uH
1mH
±2.0% of rdg ±0.05mH
±5.0% of rdg ± 0.05H
20.00H 10mH ±5.0% of rdg ± 0.2H
Maximum Input: 600V DC or 600V AC RMS
Diode Test
AccuracyTest current
0.3mA typical
Resolution
1 mV ±10% of rdg ± 5 dgts
Open circuit voltage: 1.1V DC typical
Overload protection: 600V DC or AC RMS.
Audible continuity
Audible threshold: Less than 30Ω; Test current: <0.3mA
Overload protection: 600V DC or AC RMS.
OPERATION
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 15 minutes 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.

AUTO RANGING/MANUAL RANGE SELECTION
When the meter is first turned on, it automatically goes into Auto
ranging. 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 key. The “AUTO” display indicator will turn off or
select diode /beeper, AC/DC Clamp
2. Press the RANGE key to step through the available ranges until you
select the range you want.
3. To exit the Manual Ranging mode and return to Auto ranging, press
and hold the RANGE key for 2 seconds.
MAX/MIN
Note: When using the MAX/MIN function in Autoranging mode, the
meter will “lock” into the range that is displayed on the LCD when
MAX/MIN is activated. If a MAX/MIN reading exceeds that range, an
“OL” will be displayed. Select the desired range BEFORE entering
MAX/MIN mode.
1. Press the MAX/MIN key to activate the MAX/MIN recording
mode. The display icon "MAX" will appear. The meter will display
and hold the maximum reading and will update only when a new
“MAX” occurs.
2. Press the MAX/MIN key again and the display icon "MIN" will
appear. The meter will display and hold the minimum reading and
will update only when a new “MIN” occurs.
3. To exit MAX/MIN mode press and hold the MAX/MIN key for 2
seconds

DISPLAY BACKLIGHT
The BACK LIGHT BUTTON is used to turn the back light ON. Push the
BACK LIGHT BUTTON again to turn the back light OFF.
HOLD: The hold function freezes the reading in the display.
Press the HOLD key momentarily to activate or to exit
the HOLD function.
RELATIVE
ZERO BUTTON: For convenient readings comparison & offset
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 Ω position.
2. Insert the black test lead banana plug into the negative (COM) jack
and the red test lead banana plug into the positive Ω 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 position.
2. Insert the black lead banana plug into the negative (-) jack (COM)
and the red test lead banana plug into the positive (+) jack (Ω).
3. Press the button until the symbol appears in the display.
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than approximately 100Ω, 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.
1. Set the function switch to position.
2. Press the 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
(Ω).
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.
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 (COM) jack
and the red test lead banana plug into the positive Ω jack.
3. Touch the test leads to the capacitor to be tested. The display will
indicate the proper decimal point, value and symbol.
NOTE: The value indicated in the display during the diode check is
the forward voltage.

INDUCTANCE MEASUREMENT
WARNING: To avoid electric shock, disconnect both test probes from
any source of voltage before making a inductance measurement.
1. If you wish to measure inductance, set the function switch to the
10mH.
2. Insert the black test lead banana plug into Negative input jack for
inductance measurements and the red test lead banana plug into
Negative input jack for inductance measurements.
3. Touch the inductance Probe head to the part which inductance you
wish to measure. Keep the probe touching the part under test until
the reading stabilizes (about 10 seconds).
4. 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 inductance 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, “ ” 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.
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 (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.

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