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Extech Instruments 382860, Instruction Manual, Page: 10 / 16

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Extech Instruments 382860 Instruction Manual Download Page 10

10                                     382860       Ver. 1.5    2/01

 

2.  Connect the test-leads to the device under test. Ensure that all power is 

removed from devices under test. Auto Range selects the appropriate range 

automatically. 

3.  Normally the resistance of the test-leads can be disregarded (approx. 0.1 to 

0.2 Ohm). However, this small value can cause inaccuracy in the 400 Ohm 

range. To determine the error before measurement, short the test-lead tips 

and read the resistance value on the display. Subtract this value from 

readings to cancel lead resistance errors. 

4.  During resistance tests, make sure that the contact between test leads and 

circuits is optimized. Make sure the test points are free of dirt, oil or solder 

flux, etc. since these may seriously influence the measurement. 

5.  For resistance measurements >4M, the display will take several seconds to 

stabilize.  

6.  The left-most sub-LCD updates one second later than the main LCD, the 

middle sub-display 2 seconds later and the right-most sub-display 3 seconds 

later.  

6.5 Diode Test 

Attention: During diode tests, ensure that components and circuits under test are NOT 

powered. All existing capacities must be discharged. 

1.  Set the Rotary Switch to the diode symbol position. The diode icon will be 

displayed. Manual range selection is not possible during diode tests. 

2.  Connect the test-lead tips to the object under test. The RED probe-tip 

connects to the anode of the device under test and the BLACK test-lead tip 

connects to the cathode. 

3.  A diode’s forward voltage should measure approx. 0.25 V (Germanium) or 0.7 

V (Silicon), if the diode is GOOD. 

4.  Reverse the probe-tips (Red to the cathode and Black to the anode) to check 

the diode’s reverse status. 

5.  If  “OL” (overload) is displayed, the diode is open or measures above 2.0 V.  If 

a value between 0 V and approx. 2.0 is displayed, then a good forward 

voltage drop exists. 

6.  During diode tests the center sub-display indicates GOOD if the diode is o.k.  

If the diode is defective (short circuit) or low resistance short then SHORT is 

displayed. If the diode is defective due to high resistance or if the test leads 

are accidentally reversed (red to cathode and black to the anode) then 

“OPEN” for (open circuit) is displayed. 

NOTE: Checking LED components in Diode Test mode 

The meter’s test voltage in diode test mode is sufficient to “illuminate” most  

(low current) LEDs. If the LED has an operating voltage of more than 2.0 V, 

the meter will falsely indicate that the LED is defective when it actually may be 

good. 

 

6.6 Frequency Measurement 

Attention: Observe the max. input limits. Never connect voltages over 750 VDC/VAC 

rms. It is hazardous to touch the terminals or probe tips when measuring voltages > 

25VAC/35 VDC. Disconnect the test-leads from the contact points when measuring 

voltage (over 25 VAC or 35 VDC) and before changing the meter function and range  

1.  Set the rotary function switch to the “FREQ” position and insert the test leads 

to the meter 

2.  Connect the test-lead tips to the frequency source under test (generator, etc.). 

For the best accuracy, the use of BNC-Cables is strongly recommended. 

During frequency measurements, the right sub-display shows the dB-value of 

the AC voltage, the middle sub-display shows the AC voltage “V” and the 

main display: the present input value (frequency).

 

 

Summary of Contents for 382860

Page 1: ...the correct measuring range to achieve best accuracy REL Relative function allows the operator to measure a value with respect to a preset reference value CMP Comparator function allows a comparative measurement to be made the upper lower limits can be defined MEM Memory and RCL Recall functions permit 10 measurements to be stored in memory for later recall AUTO POWER OFF extends the life of the b...

Page 2: ...ons NOTES Accuracies are of reading and specified at 23o C with RH 75 for a period of 1 year after production Warm up time is 1 minute Mode Measuring Range Accuracy Resolution 400 mV 100 µV 4 V 1 mV 40 V 10 mV 400 V 0 3 1dgt 100 mV DC Voltage 1000 V 0 5 1dgt 1 V 400 µA 0 1µA 4mA 1 0 1dgt 1 µA 40mA 10 µA 400mA 0 8 1dgt 100µA 4A 1mA DC Current 20A 1 5 5dgt 10mA Accuracy Mode Measuring Range 40Hz 1KH...

Page 3: ...0 Ohm Audible tone approx 40 Ohm Mode Measuring Range Accuracy Power Measurements AC Current AC Voltage True Power True Power Phase angle cosine To 16 A 91 to 120V To 100 W To 4000 W 90 to 90 degrees 2 5dgts 3 3dgts 5 10dgts 2 5dgts Power Factor 00 00 to 1 00 2 3 Overload Protection 400mA AC DC in the mA range Resistance Measurement 40 Mohm overload Protection 250 V DC AC rms Frequency Measurement...

Page 4: ...ned voltage carrying components may be accessible Terminals can also carry voltage If it is necessary to open the unit for adjustment maintenance repairing or exchange of parts or modules the measuring unit has to be removed from all voltage sources Capacitors can still carry voltage even if the unit has been removed from all voltage sources Please make sure to use new fuses of the proper rating D...

Page 5: ...t types The supplied test leads are rated for a maximum of 1200V The maximum rating of the multimeter is 1000 VDC max or 750 VAC rms Use special caution when working with voltage above 25 V AC and above 35 V DC SAFETY SYMBOLS This symbol adjacent to another symbol terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal i...

Page 6: ...ity check modes UP DOWN Keys Used to 1 Enter reference values in the REL or CMP modes 2 Address stored values in the MEM and RCL modes 3 Manually set the measurement range in the R H function mode 4 Scroll through advanced Functions list UP forward DOWN backward BACKLIGHT ADJUST Key circular blue colored button Press this key to deepen the LCD backlight effect The backlight extinguishes after a 15...

Page 7: ...ing frequency measurement To return from this function mode press the SET RESET key Auto Hold A H In this function the meter will automatically record the MIN MAX AVG readings taken since this mode was accessed These values are continuously updated To access A H press the FUNCTION key three times Then press the SET RESET key once Use the UP and DOWN keys to select the decimal location for the MIN ...

Page 8: ...sub display the 2nd recalled value ref No 1 appears on the center sub display and the 3rd recalled value ref No 2 appears on the right side sub display and so on for the remaining locations CMP Comparison Comparison mode allows readings to be compared to user programmable High Low setpoints Press the FUNCTION key and then the DOWN key Press the SET RESET key once and the word LOW should begin flas...

Page 9: ...c and read the current on the LCD During AC current measurements the middle sub display will show the frequency of the measurement and the main display indicates the current measurement 5 During DC current measurements the left most sub display is updated one second later than the main LCD The middle sub display two seconds later and the right sub LCD three seconds later Attention Never measure cu...

Page 10: ... or 0 7 V Silicon if the diode is GOOD 4 Reverse the probe tips Red to the cathode and Black to the anode to check the diode s reverse status 5 If OL overload is displayed the diode is open or measures above 2 0 V If a value between 0 V and approx 2 0 is displayed then a good forward voltage drop exists 6 During diode tests the center sub display indicates GOOD if the diode is o k If the diode is ...

Page 11: ...isplay 2 seconds later and the right 3 seconds later Important Transistor measurement notes Observe the sequence of connections E B C for the transistor Some Darlingtons or special power transistors contain internal base to emitter resistances that could cause erroneous measuring results The hFE measuring value is not an absolute measurement It only indicates if the transistor is operating or not ...

Page 12: ...e right Always connect the correct contacts for all plug connections The labeling on the Power Adaptor matches the meter s labeled input terminals for convenience 3 Connect the appliance load under test not powered to the socket of the Power Adaptor 4 Power the load under test by inserting the three prong plug into a 117VAC outlet Readings can now be observed on the LCDS 5 The maximum AC current t...

Page 13: ...per Hour is programmed 3 Press the SET RESET key to begin editing the left most digit will flash Enter the desired value via the UP DOWN keys While programming to move to the next digit for editing use the SET RESET key Digits are selected and ready for editing when they are flashing 4 Press the SET RESET key until the digits cease flashing when finished editing the cost per hour value and then me...

Page 14: ... numbers 0 010 KHz 10Hz reference no 0 0 050 KHz 50Hz reference no 1 0 060 KHz 60Hz reference no 2 0 100 KHz 100Hz reference no 3 0 400 KHz 400Hz reference no 4 1 010 KHz 1010Hz reference no 5 2 021KHz 2021Hz reference no 6 4 042KHz 4042Hz reference no 7 8 084KHz 8084Hz reference no 8 10 24kHZ 10240Hz reference no 9 Attention Never short the output of the signal generator The output terminal and t...

Page 15: ...SCOPE VIEW icon Follow the on screen help for specific operation instruction Also refer to the README file in the diskette s SCOPE subdirectory for operation hints 10 MAINTENANCE 10 1 Fuse Replacement Remove power to the meter and removal all connected cables and probes Use a suitable Phillips screwdriver to carefully open the case Remove the defective fuse s and replace it with a new one of the s...

Page 16: ... 890 7440 for authorization A Return Authorization RA number must be issued before any product is returned to Extech Thesenderis responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair...

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