Major tech MT785 Manuale utente
MT785
1000 A AC/DC TRMS
POWER CLAMP METER
2
Contents Page no
3
1. Safety
1.1. International 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 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
1.2. Safety Notes
Ÿ Do not exceed the maximum allowable input range of any function.
Ÿ Do not apply voltage to meter when resistance function is selected.
Ÿ Set the function switch OFF when the meter is not in use.
Ÿ Remove the battery if meter is to be stored for longer than 60 days.
1.3. Warnings
Ÿ Set function switch to the appropriate position before measuring.
Ÿ When measuring volts do not switch to current/resistance modes.
Ÿ Do not measure current on a circuit whose voltage exceeds 600V.
Ÿ When changing ranges always disconnect the test leads from the
circuit under test.
1.4. Cautions
Ÿ Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
Ÿ Always remove the test leads before replacing the battery or fuses.
Ÿ Inspect the condition of the test leads and the meter itself for any
damage before operating the meter. Repair or replace any damage
before use.
Ÿ Use great care when making measurements if the voltages are
greater than 25VAC RMS or 35VDC. These voltages are considered a
shock hazard.
Ÿ Always discharge capacitors and remove power from the device under
test before performing Diode, Resistance or Continuity tests.
4
Cautions cont.
Ÿ Voltage checks on electrical outlets can be difficult and misleading because
of the uncertainty of connection to the recessed electrical contacts. Other
means should be used to ensure that the terminals are not "live".
Ÿ If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
A AC, A DC 1000A AC
Maximum
Input
Function
1000V DC/AC
600V DC/AC
600V DC/ AC
V DC, V AC
Resistance, Capacitance, Frequency,
Diode Test
Temperature
2. Description
2.1. Meter Description
1. Current clamp
2. Flash light LED
3. Non-contact AC voltage
indicator light
4. Flash light button
5. Clamp trigger
6. Rotary Function switch
7. Data Hold and Backlight button
8. MODE select button
9. PEAK and INRUSH button
10. Max/Min button
11. RANGING button
12. LCD display
13. COM input jack
14. V ΩCAP TEMP Hz jack
15. Battery Cover
5
_______
1
__________2
__
_____
5
________
7
________
8
________
12
_________
13
__________
10
__
___________15
__
_________14
_______9
__________11
__
________6
______4
__________3
2.2 Display icons Description
HOLD Data Hold
- Negative Reading Display
0 to 3999 Measurement display digits
MAX/MIN Maximum/Minimum
REL/DCA Zero
Auto Power Off
AUTO Auto Range Mode
DC/AC Direct Current / Alternating
Current
Low Battery
mV or V Milli-volts or Volts (Voltage)
Ohms (Resistance)
A Amperes (Current)
F Farad (Capacitance)
Hz/% Hertz (Frequency)/
Percent (duty ratio)
C° and F° Celsius and Fahrenheit units
(Temperature)
n, m, μ, M, k Unit of measure prefixes: nano, milli, micro
Continuity Test
Diode Test
THD THD Test
Individual Harmonic mode
Select Mode
6
3. SPECIFICATIONS
Voltage
Function Range Resolution Accuracy
(% of reading + digits)
DC Voltage
6.000V
60.00V
600.0V
1000V
1mV
10mV
100mV
1V
+1.0% of rdg + 3digits
+1.2% of rdg + 3digits
+1.2% of rdg + 3digits
+1.5% of rdg + 3digits
Function Range Resolution Accuracy
(% of reading + digits)
AC True RMS Voltage
6.000V
60.00V
600.0V
1000V
1mV
10mV
100mV
1V
+1.2% of rdg + 5digits
+1.2% of rdg + 5digits
+1.5% of rdg + 5digits
+3% of rdg + 8digits
Maximum Input: 1000V DC
AC Response: 50 Hz to 400Hz
Not sinusoidal waveform Accuracy:(60Hz to 400Hz) : (10%rdg + 10dgt)
Maximum Input: 1000V ac rms.
Function Range Resolution Accuracy
(% of reading + digits)
AC +DC
6.000V
60.00V
600.0V
1000V
1mV
10mV
100mV
1V
+1.5% of rdg + 5digits
+1.5% of rdg + 5digits
+1.5% of rdg + 5digits
+3% of rdg + 8digits
7
Function Range Resolution Accuracy
(% of reading + digits)
DC A
60A
1000A
60A
1000A
10mA
100mA
10mA
100mA
±(2.5% of reading + 0.2A)
±(2.5% of reading + 5digits)
50-60Hz ±(2.5% of reading + 8digits)
AC A
Current
Function Range Resolution Accuracy
Frequency 20Hz-10kHz 0.1Hz ±(0.5% of reading + 3digits)
Frequency
Function Range Resolution Accuracy
AC A/AC V 99.9% 0.1% ±(3% of reading + 10digits)
Total Harmonic Distortion
Harmonic distortion measurement
Function Range Resolution Accuracy
H01-H12 99.9% 0.1% ±(5% of reading + 10digits)
±(10% of reading + 10digits)
Active Power
Function Range Accuracy
AC W 599.9KW
ACA Sensitivity: >10A RMS
DCV Sensitivity : >5V MAX 600V
A.error x v.reading+
V.error x A.reading
H13-H25
8
Power Factor
Function Range Accuracy
PF -1.0-0.0-1.0 ±(3% of reading + 1digits)
Function Range Resolution Accuracy
Resistance
Resistance & Continuity & Diode
600.0Ω
6.000kΩ
60.00kΩ
600.0kΩ
6.000MΩ
60.00MΩ
0.1Ω
1Ω
10Ω
100Ω
1kΩ
10kΩ
±(1.0% of reading + 5digits)
±(1.5% of reading + 3digits)
±(1.5% of reading + 3digits)
±(1.5% of reading + 3digits)
±(2.0% of reading + 5digits)
±(3% of reading + 8digits)
Function Range Resolution Accuracy
Capacitance
Capacitance
9.999uF
99.99uF
999.9uF
9999uF
1nF
10nF
0.1uF
1uF
±(3% of reading + 5digits)
±(3% of reading + 5digits)
±(4% of reading + 10digits)
±(4.5% of reading + 10digits)
Function Range Resolution Accuracy
Temperature
Temperature
-50°C ----
+599.9°C
600°C ----
+1000°C
-58°F ----
+599.9°F
600°F ----
+1832°F
0.1°C
1°C
0.1°F
1°F
±(3% of reading + 5°C)
±(3% of reading + 5°C)
±(3% of reading + 9°F)
±(3% of reading + 9°F)
9
Function Testing Condition Reading
Diode
Diode and Continuity
Forward DCA is approx.1mA,
open circuit Voltage MAX . 3V
Test current MAX. 1.5mA
Forward voltage drop of Diode
Buzzer makes a long sound,
While resistance is less than(50)
Continuity
4. General Specifications
Clamp jaw opening 1.9" (48mm) approx.
Flexible coil φ140*180mm
Display 3-6/7 digits (6000 counts) backlit LCD
Threshold 50Ω; Test current <0.5mA
Continuity check
Low Battery indication is displayed
Over-range indication 'OL' display
Measurement rate 3 readings per second, nominal
PEAK Captures peaks >1ms
INRUSH 100MS
Temperature sensor Type K thermocouple
Input Impedance 10MΩ (VDC and VAC)
AC response True RMS (A AC and V AC)
Operating Temperature 5°C to 40°C (41°F to 104°F)
Storage Temperature -20°C to 60°C (-4°F to 140°F)
Operating Humidity Max 80% up to 31°C (87°F) decreasing
linearly to 50% at 40°C (104°F)
Storage Humidity <80%
Operating Altitude 2000meters (7000ft.) maximum.
Battery One (1) 9V Battery
Auto power OFF After approx. 30 minutes
Dimensions & Weight 230 x 76 x 40mm; 315g
Safety For indoor use and in accordance with the
requirements for double insulation to
IEC1010-1 (2001): EN61010-1 (2001)
Overvoltage Category III 1000V and
Category IV 600V, Pollution Degree 2
10
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