Safety Notices; Technical Datasheet - Crown CT44051 Manual Original

Safety notices:

The use of meter instruments near devices with large electromagnetic disturbances will be
unstable and may even cause large errors.
Do not use when the appearance of the meter or the test pen is broken.
If the meter is not used correctly, the safety functions provided by the meter may fail.
Care must be taken when working around bare conductors or buses.
Do not use this instrument near explosive gas vapor or dust.
The correct input function must be used to measure the range.
The input value must not exceed the limit of the input value specified for each range to
prevent damage to the instrument,
Do not touch the unused input when the instrument is connected to the circuit under test.
When the measured voltage exceeds 60 Vdc or 30 Vac, use caution to prevent electric shock.
When measuring with a test pen, place your finger behind the guard ring of the test.
Before converting the range, it must be ensured that the test pens have left the circuit under
test.
Before carrying out a resistance, diode, capacitance measurement or continuity test, the
circuit under test must be powered off and all high-voltage capacitors in the circuit under
test should be discharged.
Do not measure the resistance on a live circuit or perform buzzer test.
Before conducting the current measurement, the fuse of the meter should be checked.
Before connecting the meter to the circuit under test, the power of the circuit under test
should be turned off.
When performing TV repairs or measuring power conversion circuits, care must be taken in
the high-amplitude voltage pulses in the circuit under test to avoid damage to the meter.
The instrument uses three pieces AA 1.5V batteries to power the battery. The battery must
be properly installed in the battery compartment of the meter.
When the battery with low voltage symbol
Insufficient battery power can make the meter read incorrectly, which may result in electric
shock or personal injury.
When measuring voltages, do not exceed 600V. Do not use the instrument when the
instrument's housing or part of the housing is removed.
Maintenance:
When opening the instrument case or removing the battery cover, pull out the test pen first.
The specified replacement parts must be used to service the meter.
appears, replace the battery immediately.
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Before opening the meter, all relevant power must be disconnected. At the same time,
you must ensure that you do not have static electricity to avoid damage to the meter.
Instrument components, instrument calibration and maintenance operation
instructions are operated by professionals.
When opening the instrument housing, some capacitance in the instrument must be
noticed. Even after the instrument is turned off, dangerous voltages are kept.
If the instrument is observed Any abnormality, the table should be immediately
stopped and sent for repair, and to ensure that it can not be used before inspection
qualified.
When not in use for a long time, please remove the battery, and avoid storing in high
temperature and humidity.
Input protection measures
The limit voltage is 600V when the voltage is measuring.
The limit voltage is 250 Acv or the equivalent RMS voltage when the frequency,
resistor ,buzzer or the diode is measuring.
The fuse (F200mA/250V)will work to protect when the uA and mA is measuring.
General maintenance
In order to avoid electric shock or damage to the instrument, it cannot be the inside
of the instrument. Before opening the housing or the battery cover, the connection of the
test meter and the input signal must be removed.
Periodically use a damp cloth and a small amount of detergent to clean the meter housing. Do
not use abrasives or chemical solvents. Input sockets, if soiled or wet, may affect readings.

Technical datasheet

Comprehensive indicators
*Operating conditions:
600V CAT IV and 1000V CAT.III Pollution grade: 2
Height: under 2000m
Working temperature: 0-40℃（＜80%RH, not considered ＜10℃）
Storage temperature: -10-60℃（＜70%RH, take off battery）
*Test or calibrate ambient temperature：20°C±2°C
*The biggest voltage between measurement end and ground: 600V
*Fuse protection: mA range , fuse: FF 200mA/250V
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