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

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.

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