GW INSTEK GDM-357 [2/2] Gwiostek
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GW INSTEK GDM-357 [2/2] Gwiostek

GW INSTEK GDM-357 [2/2] Gwiostek

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GWIOSTEK P N 82DM 35700M01 V OPERATING METHOD 2 Set the rotary switch to A range Connect test leads to the tested circuit in series Precautions before operation Notice 1 Press the POWER switch to check 9v battery In case of lower battery voltage level S will be shown on the display In this case you need to replace the battery 2 A symbol near the input terminals means that input voltage or current shall not exceed the indicated value so that the internal circuits can be protected from damage 3 Prior to the testing the functional switch shall be placed at the needed range 4 Multimeter Description 1 Refer to Notice 1 2 and 3 in the Direct Current Measurement Power switch LCD display Data hold Rotary switch Input Terminals Measuring Resistance 1 Insert test leads into input terminals Red to Q and black to COM 2 Set the rotary switch to O range Connect test leads to tested resistor in parallel A Notice 1 If the resistance to be tested is more than the maximum value of the range selected over range 1 will be shown You shall select higher range For resistance more than 1MO and above the reading can become stable after several seconds this is normal for high resistance reading 2 When input is not made such as open circuit conditions the instrument shows 1 3 When you check the impendence of internal circuits power supply to the circuit to be tested must be cut off and all capacitors must be totally discharged Measuring Capacitance Prior to connection to the capacitance to be tested note that time for zero reset is needed for each change of range Existing drift reading cannot influence the testing precision Notice 1 Although the capacitance ranges have been protected internally you still need to discharge all tested capacitors so as io avoid any damage to the instrument or any measurement error 2 In measuring capacitance connect the capacitor to the capacitance testing terminals 3 In measuring large capacitance it will take a certain time period to get stable reading 4 Unit 1pF 10 pF 1nF 10 3pF VII ACCESSORIES 1 Operating Manual 1 pc 2 Test Leads 1 pair 3 Cross point type thin line K thermocouple sensor 1 pc Measuring Temperature Measuring DC Voltage 1 Insert test leads into Input terminals Red to V and black to COM 2 Set the rotan switch to V range Connect test leads to the power or load under test and the positive poianty of the test end will indicate 1 In measuring the temperature insert the cold end free end of thermocouple sensor into the temperature terminals and at the same time note the polarity Place the working end temperature measuring end on or inside the object to be tested You read the temperature directly from the display which is expressed in C or T The content of this manual is subject to changes without notice Testing Diodes and Continuity Notice 1 If the scope of voltage to be tested is not known the functional switch shall be placed at the maximum range which will be gradually lowered for testing 2 If the display only shows 1 it indicates over range In this case the functional switch shall be placed at higher range 3 A indicates that you must not input a voltage more than 600V It is possible to show a higher voltage but it has a nsk of damaging the internal circuits 4 Special attention shall be given to measurement of high voltage to avoid electric shock Measuring AC Voltage 1 Insert test leads into input terminals Red to V and black to COM 2 Set the rotary switch to V range Connect test leads to the power or load under test Notice 1 Refer to Notice 1 2 and 4 in the DC Voltage Measurement 2 A indicates that you must not input a voltage more than 600V It is possible to show a higher voltage but it has a risk of damaging the internal circuits Measuring DC current 1 Insert the black test lead into COM terminal For currents200mA insert the red test lead into mA terminal If current goes up to 10A insert red test lead into 10A terminal 2 Set the rotary switch to A range Connect test leads to the tested circuit in series The polarity of red test lead will show Notice 1 If the scope of current to be tested is not known the functional switch shall be placed at the maximum range which will be gradually lowered for testing 2 If the display only shows 1 it indicates over range In this case the functional switch shall be placed at higher range 3 A indicates that the maximum input current is 200mA The built in fuse of 200mA 600V t 5 x 20 mm can effectively protect the circuit from bum out 10A range use fuse of 10A 600V 6 x 25 mm for protection 1 Insert test leads into input terminals Red to VO and black to C0M for the red test lead Then set the rotary switch to Connect test leads to tested diode The displayed reading is the approximate value of forward voltage drop of diode 2 Connect test leads to the circuit under test if the resistance between two tested ends is 10 Q the built in buzzer sounds Auto Power Off 1 Auto Power Off circuit is set for the instrument When working time of the instrument is about 15min the power is automatically cut off Then the instrument goes into sleeping state In this case the instrument consumes about 7pA current 2 If you want to restart the power after power off press the power switch twice VI MAINTENANCE This digital universal meter is an electronic precision instrument Do not change circuits randomly and note the following aspects 1 Do not connect to voltages higher than 600V DC or 600VC RMS 2 Do not connect to the voltage source when the function switch is at current ranges Q and L ij 3 Do not use this instrument when the battery is not well connected or its back cover is not tightly installed 4 You can only change the battery or fuse when the test leads are removed and power is cut off Battery installation or replacement This product adopts 9V battery Refer to Fig 2 install or replace the battery as per the following sequence a Shut down this product and remove the test leads from input terminals b Place the product to make its panel face down unscrew screws on the battery box cover remove the cover and take the battery out c After the new battery is installed install the battery cover and tighten the screws This manual contains proprietary information which is protected by copyright All lights are reserved No part of this manual may be photocopied reproduced or translated to another language without prior written consent of Good Will company The information in this manual was correct at the time of pnnung However Gcod Will i ontinues to improve products and reserves the rights to change specification equipment and maintenance procedures at any time without notice Measuring AC Current 1 Insert the black test lead into COM terminal For currents200mA insert the red test lead into mA terminal If the current goes up to 10A insert red test lead into 10A terminal Good Will Instrument Co Ltd No 7 1 Jhongsing Rd Tucheng Dist New Taipei City 236 Taiwan

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