12
1)
With the meter in the desired function (AC Voltage or AC Current), press the
Hz/DUTY
key.
2)
Read the frequency of the AC signal on the display.
3)
To make a duty cycle measurement, press the
Hz/DUTY
key again.
4)
Read the percent of duty cycle on the display..
5)
Set the rotary switch to the Hz range.
6)
Insert the black and red test leads into the COM and Hz input terminals.
7)
Connect the test leads tip in parallel with the circuit to be measured. And don’t touch any
electrical conductors.
8)
At frequency measuring status, press
Hz/DUTY
one time then meter enters duty cycle measuring
status, press it again then return to frequency measuring status.
9)
Read the result directly from the display.
Note:
In noisy environment, it is preferable to use shield cable for measuring small signal
3.2.7 Temperature measurement
To avoid electrical shock and/or damage to the instrument, do not apply more
than 250Vdc or 250Vac rms between the °C terminal and the COM terminal.
To avoid electrical shock, do not use this instrument when voltages at the
measurement surface exceed 60v dc or 24v rms. Ac.
To avoid damage or burns. Do not make temperature measurement in microwave
ovens.
To measure temperature:
1)
Set the rotary switch to
°
C
range and the LCD will show the current environment temperature.
2)
Insert ‘K’ type thermocouples into the COM terminal and
°
C
terminal (or you can insert it by
using Multi Function Socket)Takings care to observe the correct polarity.
3)
Touch the object with the thermocouple probe for measurement.
4)
Read the stable reading from LCD.
3.2.8 Current measurement
To avoid damage to the Meter or injury if the fuse blows, never attempt an in-
circuit current measurement where the open-circuit potential to earth is greater
than 250V.
To avoid damage to the meter, check the meter's fuse before proceeding. Use the
proper terminals, function, and range for your measurement. Never place the
probes in parallel with a circuit or component when the leads are plugged into the
current terminals.
Summary of Contents for AX-18B
Page 1: ...AX 18B INSTRUCTION...