Ur's Guide
Extech AM300
300A AC Analog Clamp Meterntr是什么的简称
Introduction
Congratulations on your purcha of the Extech AM300 Analog Clamp Meter. This device measure
AC Voltage and Current, DC Voltage, and Resistance. This meter is shipped fully tested and
calibrated and, with proper u, will provide years of reliable rvice.英文翻译字典
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the ur must refer to the
manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal u, hazardous voltages
jink
may be prent
英文单词
Double insulation
SAFETY NOTES
•Do not exceed the maximum allowable input range of any function.
Input Function Maximum
A AC 300A AC
V DC, V AC 600V DC/AC
•Do not apply voltage to meter when resistance function is lected.
•Remove the battery if meter is to be stored for longer than 60 days.
WARNINGS
•Set function switch to the appropriate position before measuring.
•When measuring volts do not switch to current/resistance modes.
•Do not measure current on a circuit who voltage exceeds 600V.
•When changing ranges always disconnect the test leads from the circuit under test.
CAUTIONS
•Improper u of this meter can cau damage, shock, injury or death. Read and understand
this ur manual before operating the meter.
•Always remove the test leads before replacing the battery or fus.
•Inspect the condition of the test leads and the meter itlf for any damage before operating the meter. Repair or replace any damage before u.
•U great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. The voltages are considered a shock hazard.
•Always discharge capacitors and remove power from the device under test before performing
Resistance tests.
•Voltage checks on electrical outlets can be difficult and misleading becau of the uncertainty
of connection to the recesd electrical contacts. Other means should be ud to ensure that
ingredientthe terminals are not "live".
•If the equipment is ud in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
STANDARDS
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
一般现在时练习题及答案
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation.
Note – Examples include houhold, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial u with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for u at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
Meter Description
1. Current
clamp
2. Clamp opening trigger
3. Function Selector Switch
4. Scale
Display
5. POINTER LOCK switch
6. Meter zero adjust
7. Zero ohms adjust
8. COM negative input jack for black test lead
9. OHMS positive input jack for red lead
10. VOLT positive input jack for red lead
2 5 6
7 10
NOTES:Read and understand all Warning and Caution statements in this operation manual prior to using this meter. AC Current Measurements
WARNING:Ensure that the test leads are disconnected from the meter before making current clamp measurements.翻译证
1. Set the scale to the highest range using the function thumbwheel switch. Step down to the
lower ranges as necessary in order to keep the reading in the upper half of the scale.
2. Ensure that the Pointer Lock switch is t to the right-most position so that the pointer may
freely move.
3. Turn the Zero Adjust screw to zero the
meter display.
4. Press the trigger to open jaw. Fully enclo
only one conductor. For optimum results,
center the conductor in the jaw.
5. The analog display pointer will indicate theworkmate
current reading.
AC/DC Voltage Measurements
1. Inrt the black test lead into the negative COM terminal and the red
test lead into the positive V terminal.
2. Set the display to the highest AC or DC Voltage range using the
thumbwheel switch. Step down to the lower ranges as necessary in
order to keep the reading in the upper half of the scale.
3. Ensure that the Pointer Lock switch is t to the right-most position so
用发展的眼光看中国that the pointer may freely move.
4. Turn the Zero Adjust screw to zero the meter display.
5. Connect the test leads in parallel to the circuit under test.
6. The analog display pointer will indicate the voltage reading.
日常英语口语900句
