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— 14 —

[14]  MEASURING OF AC CURRENT (fixed range)

Measurement of 0 

〜

300mA(0 

〜

3A)

To prevent damage to the tester and personal injury, do not
measure current when the voltage exceeds 

±

600V.

After preparation described in [8]  PREPARATION FOR
MEASUREMENT has been completed, measure current as follows.

1. Connect the plugs of the test leads to the measurement

terminals (-COM) and (     ).

(For AC current measurement, the red and black plugs need not

be distinguished.)

2. Turn the function switch to

mA/3A

〜

.

3. Apply the test pins to an object.
4. Read the value as indicated on the range display. This is the

current you have measured.

5. After measurement, release the test pins from the object.
6. Return the function switch to

POWER OFF

.

Protection circuit

:

As a safety measure against misoperation in measurement of
resistance and current, a fuse is set in the input section (but no
fuse in the measurement terminal for 3A   ). If the tester is
operated erroneously, this fuse is blown. Although this fuse can
protect the tester, the best practice is, of course, to operate the
tester as instructed in this manual.

Summary of Contents for AU-31

Page 1: ...AU 31 MULTITESTER INSTRUCTION MANUAL ...

Page 2: ... 8 PREPARATION FOR MEASUREMENT 008 9 MEASURING OF DC VOLTAGE 008 10 MEASURING OF AC VOLTAGE 010 11 MEASURING OF LOW FREQUENCY OUTPUT dB 011 12 MEASURING OF RESISTANCE auto range 011 13 MEASURING OF DC CURRENT fixed range 013 14 MEASURING OF AC CURRENT fixed range 014 15 MAINTENANCE 015 15 1 Replacement of dry cells Refer to Fig 6 015 15 2 Replacement of fuses Refer to Fig 6 015 15 3 Cleaning and S...

Page 3: ...to range A fully automatic range selector type eliminates a need for selection of ranges for voltage or resistance measurement The suitable range is automatically set according to application 2 Auto polarity Both positive and negative polarities of DC voltage and current can be automatically measured 3 High input resistance An input resistance as high as 10MΩ for measurement of both DC and AC volt...

Page 4: ...ever make a short circuit of the fuse 18 Always keep your fingers behind the finger guards on the probe when making measurements 19 Be sure to disconnect the test pins from the circuit when changing the function or range 10 Before starting measurement make sure that the function and range are properly set in accordance with the measurement 11 Never use the meter with wet hands or in a damp environ...

Page 5: ...0 1k 20kΩ 2MΩ x1k 200kΩ 20MΩ x10k 2MΩ 200MΩ 3 of max scale 3 of max scale 4 for 1000V 10 of max scale 3 of max scale Frequency characteristic 40Hz 10kHz 5 3 of max scale 4 for 1000V 3 of max scale length 4 for 62 dB 3 of max scale 3 of max scale 3 of scale length Input resistance approx 1MΩ Input resistance 10MΩ min Probe resistance 1000MΩ Input resistance approx 1MΩ Full wave rectification Input ...

Page 6: ... of test leads TL 61G type Fuse 5Φ x 20mm 250V 0 5A Battery R03 IEC or UM 4 4 pieces Life of dry cell Approx 100 hours when used 8 hours a day Factory preinstalled built in battery A battery for monitoring is preinstalled before shipping therefore it may run down sooner than the battery life specified in the instruction manual The battery for monitoring is a battery to inspect the functions and sp...

Page 7: ...point setter of indicator Polarity display LED Function switch Measurement terminal Pointer Range display Manual range select switch Range hold switch Measurement terminal for 3A Measurement terminal COM Test pins Cords Red plug Black plug Fig 1 Tester Fig 2 Test Leads ...

Page 8: ...t Then read a value indicated by the pointer as follows Table 2 Fig 3 Scale Plate Column Indicated by LED Scale of Scale Plate to Read Magnification of Value Read Value to Read V 3 12 60 300 1000 Ω x l0k x 1k x 0 1k x 10 x 1 mV mA 300 V scale 0 13 0 12 0 60 0 13 0 1000 Ω scale 0 0 0 0 0 A scale 0 3 x 1 x 1 x 1 x 100 x 1 x 10k x 1k x 100 x 10 x 1 x 100 0 13V 0 12V 0 60V 0 300V 0 1000V Center 2MΩ Ce...

Page 9: ...s in Fig 3 How to read A value to read is 0 300V scale as show in Table 2 and the voltage is 250 VDC 6 HOW TO FIX RANGE A range can be fixed with the range hold switch This function is used for measurement of DCV ACV and Ω 7 HOW TO SELECT RANGE MANUALLY A range can be changed over by pressing the manual range select switch This function is used for measurement of DCV ACV and Ω Range is fixed Range...

Page 10: ...en by four dry cells R03 Before starting measurement check the remaining capacity Turn the function switch to INTERNAL BATT CHECK a range to check the battery Then the pointer deflects toward the right The capacity is sufficient when the pointer comes within the range of INTERNAL BATT GOOD at the lowest scale of the scale plate If the pointer stops on the left of this range the dry cells have been...

Page 11: ...splay LED lights it indicates that the potential is applied to the measurement terminal COM and potential to the 6 After measurement release the test pins from the object 7 Return the function switch to POWER OFF Measurement of 300mV fixed range Measurement of DC voltage below 300mV max Never apply an excessive voltage over 100VAC or DC The measuring procedure is the same as for the above steps 1 ...

Page 12: ...erminals COM and For AC voltage measurement the red and black plugs need not be distinguished 2 Turn the function switch to V 3 Set the range hold switch at AUTO 4 Apply the test pins to an object 5 Read the value as indicated on the range display This is the voltage you have measured 6 After measurement release the test pins from the object 7 Return the function switch to POWER OFF Measurement of...

Page 13: ... sure to turn off the power source switch of measured circuit when the resistance in the circuit is measured Make sure that no voltage is applied to a resistor to measure After preparation described in 8 PREPARATION FOR MEASUREMENT has been completed measure resistance as follows 1 Connect the plugs of the test leads to the measurement terminals COM and 2 Turn the function switch to Ω 3 Set the ra...

Page 14: ...ith the test pins shorted CW or CCW to the 0Ω line at the right end of the Ω scale Also if the 0Ω point has moved over a long period of use make 0Ω adjustment in the same manner Applicable voltage and current in measurement of resistance Measurement of resistance is conducted with the internal power source About 1 2V is output as follows to the COM terminal and to the terminal When this voltage is...

Page 15: ...l measurement terminal for 3A 2 Turn the function switch to mA 3A 3 Apply the test pins to an object 4 Read the value as indicated on the range display This is the current you have measured If the polarity display LED lights it indicates that the potential is applied to the measurement terminal COM and potential to the 5 After measurement release the test pins from the object 6 Return the function...

Page 16: ...uished 2 Turn the function switch to mA 3A 3 Apply the test pins to an object 4 Read the value as indicated on the range display This is the current you have measured 5 After measurement release the test pins from the object 6 Return the function switch to POWER OFF Protection circuit As a safety measure against misoperation in measurement of resistance and current a fuse is set in the input secti...

Page 17: ...ld dry cells R03 and set new ones UM 4SG Pay attention to the polarity 3 Remount the battery case Fig 6 Layout of Dry Cells and Fuses 15 2 Replacement of fuses Refer to Fig 6 1 Remove the battery case lid and replace fuses 2 Use a mini fuse of 5φ x 20mm of rating of 250V AC 0 5A Spare fuse Dry cell Fuse 0Ω setter Battery case lid Before removing the battery case lid be sure to disconnect the test ...

Page 18: ...t resellers Under Sanwa s general warranty policy each instrument is warranted to be free from defects in workmanship or material under normal use for the period of one 1 year from the date of purchase This warranty policy is valid within the country of purchase only and applied only to the product purchased from Sanwa authorized agent or distributor Sanwa reserves the right to inspect all warrant...

Page 19: ...nty period has expired In some cases repair and transportation cost may become higher than the price of the product Please contact Sanwa authorized agent service provider in advance The minimum retention period of service functional parts is 6 years after the discontinuation of manufacture This retention period is the repair warranty period Please note however if such functional parts become unava...

Page 20: ...SANWA ELECTRIC INSTRUMENT CO LTD Dempa Bldg 4 4 Sotokanda2 Chome Chiyoda ku Tokyo Japan 05 11 猯 ...

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