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To enter and exit the relative measurement mode: 

1)

 

With the Meter in the desired function, touch the test leads to the circuit on which you want 

future measurement to be based.  

2)

 

Press 

REL

 key to store the measured value and activate the relative measurement mode.  

The difference between the reference value and subsequent reading is displayed. 

3)

 

Press 

REL

 key for more than 2 seconds to return the Meter to normal operation. 

 

3.2 Measurement Functions 

3.2.1 AC and DC Voltage measurement 

 

To avoid electrical shock and/or damage to the instrument, do not attempt to 

take any voltage measurement that might exceeds 1000Vdc or 1000Vac rms.  

To avoid electrical shock and/or damage to the instrument, do not apply more 

than 1000Vdc or 1000Vac rms between the common terminal and the earth 

ground.

 

 

The Meter's voltage ranges are 600.0mV, 6.000V, 60.00V, 600.0V and 1000V. (AC 600.0mV range 

only exists in manual ranging mode).  

To measure ac or dc voltage: 

1)

 

Set rotary switch to the DCV, ACV or DCmV range. 

2)

 

Connect the black and red test leads to the COM and V terminals respectively. 

3)

 

Connect the test leads to the circuit being measured  

4)

 

Read the displayed value. The polarity of red test lead connection will be indicated when 

making a DCV measurement. 

 

NOTE:  

Unstable display may occur especially at 600mV range, even though you do not put test leads into 

input terminals, in this case, if an erroneous reading is suspected, short the V terminal and the 

COM terminal, and make sure the zero display. 

For better accuracy when measuring the dc offset of an ac voltage, measure the ac voltage first. 

Note the ac voltage range, then manually select a dc voltage range equal to or higher than the ac 

range. This improves the accuracy of the dc measurement by ensuring that the input protection 

circuits are not activated. 

 

3.2.2 Resistance measurement 

 

To avoid electrical shock and/or damage to the instrument, disconnect circuit 

power and discharge all high-voltage capacitors before measuring resistance.

 

 

Summary of Contents for AX-18B

Page 1: ...AX 18B INSTRUCTION...

Page 2: ...amiliarization 6 2 2 LCD Display 6 2 3 Keypad 7 3 Function description 8 3 1 General Functions 8 3 2 Measurement Functions 8 4 Technical specifications 14 4 1 General specifications 14 4 2 Measurement...

Page 3: ...ehold appliances portable tools and similar equipment Measurement category I is for measurements performed on circuits not directly connected to MAINS NOTE Examples are measurements on circuits not de...

Page 4: ...e risk of shock due to possible improper reading verify the presence of any ac voltages by first using the ac function Then select a dc voltage range equal to or greater than the ac range Disconnect c...

Page 5: ...ces When the instrument is opened up remember that some internal capacitors can retain a dangerous potential even after the instrument is switched off If any faults or abnormalities are observed take...

Page 6: ...dicator for AC voltage or current 2 Indicates negative readings 3 Indicator for DC voltage or current 4 The meter is in the Autorange mode in which the meter automatically selects the range with the b...

Page 7: ...ess it to enter and exit the Data Hold mode Press it and hold 2 seconds backlight on if press it and hold for seconds again backlight off 2 3 3 RANGE At V V A mA and A 1 Press RANGE to enter the manua...

Page 8: ...e autorange and lock the meter in a specific range The Meter defaults to the autorange mode in measurement functions that have more than one range When the Meter is in the autorange mode AUTO is displ...

Page 9: ...in manual ranging mode To measure ac or dc voltage 1 Set rotary switch to the DCV ACV or DCmV range 2 Connect the black and red test leads to the COM and V terminals respectively 3 Connect the test le...

Page 10: ...void this do not use the 60M range for in circuit resistance measurements On 60M range the meter may take a few seconds to stabilize reading This is normal for high resistance measuring When the input...

Page 11: ...voltage function to confirm that the capacitor is discharged The Meter s capacitance ranges are 60 00nF 600 0nF 6 000 F 60 00 F and 300 0 F To measure capacitance 1 Set the rotary switch to range 2 C...

Page 12: ...0Vdc 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...

Page 13: ...serial data output function It can be connected with PC by USB interface so the measured data can be recorded analyzed processed and printed by PC Before use this function you need install the PC Lin...

Page 14: ...perating temperature 0 40 C 32 122 F 80 RH 10 non condensing Storage temperature 10 60 C 14 140 F 70 RH battery removed Temperature Coefficient 0 1 specified accuracy C 18 C or 28 C MAX Voltage betwee...

Page 15: ...r ACV 40Hz 400Hz 2 Response for ACV Average calibrated in rms of sine wave 3 Overload Protection 1000V dc or 700V ac rms 4 Input Impedance Nominal DC voltage 10M AC voltage 10M 5 Common Mode Rejection...

Page 16: ...tion 250V dc or 250V ac rms 4 2 5 Continuity Check Range Resolution Test Condition 600 0 1 Open circuit voltage approx 0 5V Description Continuity beeper 50 Overload Protection 250V dc or 250V ac rms...

Page 17: ...t 600mA dc or 600mA ac rms for A and mA ranges 10A dc or 10A ac rms for 10A ranges For measurements 6A 4 minutes maximum ON to measure 10 minutes OFF Above 10A unspecified 5 Maintenance This section p...

Page 18: ...emove the fuse by gently prying one end loose then sliding the fuse out of its bracket 6 Install the replacement fuses only with specified ratings F 10A 600V 6 3 32 and F 750mA 600V 5 20 7 Rejoin the...

Page 19: ...19 6 Accessories Delivered with the multimeter User s manual One piece Test leads One piece K type Thermocouple One piece Capacitor test lead One piece PC Link software CD One piece...

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