Extech Instruments 381295 User Manual Download Page 31

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381295 381295-220 V1.3 5/06

Appendices

Troubleshooting guide

If you experience a problem with the meter, try the corrective actions below before
concluding that the instrument needs repair.

1. Make sure you are using a fresh NI-MH battery pack or fully charged rechargeable

battery pack. If you are using the AC/DC power adapter, make sure the adapter is
plugged into an appropriate live power source.

2. If the buttons do not respond or the contrast is set such that the display is unreadable,

remove the power source while the instrument is on. Wait 15 minutes and then
restore power and retry.

3. If you still experience difficulty, check your connections and reread this instruction

manual.

4. If the meter’s display is frozen when trying to control the trigger level:

•

In normal (NOR) mode, the trigger level must be the same level as the waveform.

The Meter does not trigger if the trigger level is set above or below the waveform
level.

•

In Auto (AT) mode, the trigger level does not have to be adjusted.

•

In rare cases, the instrument may require servicing. There are no internal user-

serviceable parts.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Summary of Contents for 381295

Page 1: ...illoscope Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at www TestEquipmentDepot com Back to the Extech 381295 Product Page ...

Page 2: ...unction 11 Digital Multimeter Functions 12 Product Description 14 LCD Area 14 Keys Area 15 Terminal Area 17 Operation 18 Powering the Meter 18 Changing Backlight 18 Making Selections in a Menu 18 Frequency measurements for CHA 19 Freezing the screen 19 Changing the Graphic Representation 20 Acquiring the Waveform 21 Triggering on a Waveform 22 Setting Trigger level on NORmal trigger mode 22 Making...

Page 3: ... Designed to comply with safety standards UL3111 and CSA C22 2 No 1010 1 Safety Attention Carefully read the following safety information before using this instrument Safety Precautions Specific warning and caution statements where they apply will be found throughout the manual A Caution identifies conditions and actions that may damage the instrument A Warning identifies conditions and actions th...

Page 4: ... Channel B For measuring two signals use Channel B with Channel A 3 Common Use the black common as signal ground for low frequency measurements and for ACV DCV Ohm and Continuity measurements 4 External trigger The EXT TRIG input accepts external trigger signals Command F1 F4 Arrow Backlight and Help key 1 Function Command keys F1 through F4 are command soft keys Their functions change with each s...

Page 5: ...unction Menu Positioning the Waveform on the Screen 1 Pressing moves the waveform up 2 Pressing moves the waveform down 3 Pressing moves the waveform left 4 Pressing moves the waveform right Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com ...

Page 6: ...5 220 V1 3 5 06 6 Quick Start Division key map 1 Pressing DIV calls up the default division menu 2 Press F2 to control the Channel B Vertical Division 3 Press F3 to change the Horizontal Division 4 Press F4 to exit ...

Page 7: ...ses CHA vertical division A div 2 Pressing decreases CHA vertical division A div 3 Pressing or will change Div from MANUAL to AUTO Changing Horizontal division 1 Pressing increases Horizontal division H div 2 Pressing decreases Horizontal division H div 3 Pressing or will change Div from MANUAL to AUTO ...

Page 8: ...Trigger key map 1 Press TRIG to display the TRIGGER default menu 2 Press F2 for Single shot mode 3 Press F3 for TRIGGER SETUP 4 Press F4 to exit Trigger level control 1 Pressing increases the Trigger level 2 Pressing decreases the Trigger level ...

Page 9: ...381295 381295 220 V1 3 5 06 9 Quick Start Function key map 1 Press FUNC to display the FUNCtion default menu 2 Press F1 for SCOPE SETUP 3 Press F2 for General SETUP Press F4 to exit ...

Page 10: ...cope Bandwidth 5 MHz MultiMeter AC Bandwidth 20 kHz Power Supply Ni MH Battery 4 8V 1 2V x 4 cell Battery Life 4 Hours with Backlight OFF 3 Hours with Backlight ON Battery Charge Time 3 Hours approx AC Adaptor Charger Class 2 transformer Input 120V AC 60Hz 381295 Input 240V AC 50Hz 381295 220 Output 9V DC 1A Display Type Super Twist 132 x 128 pixels Equipment Dimensions 3 5 90mm width x 7 7 195mm ...

Page 11: ...ll Normal Accuracy 0 01 Sweep Rate 1uS to 5S in 1 2 5 sequence Vertical Bandwidth 5MHz Resolution 8 Bit Channels Dual Coupling AC DC Input impedance 1 MΩ Accuracy 3 Max Input Volts DC or AC 600Vrms Volts Division 50 mV to 500V in 1 2 5 sequence Triggering Type CHA CHB External Coupling AC DC Slope Rising or Falling edge Internal Trigger Sensitivity 2 20 Division Waveform Memory Waveform Memory 16 ...

Page 12: ...300mV 0 1mV 500m 1 2 3V 0 001V 5 10 20 30V 0 01V 50 100 200 300V 0 1V 2 5 5 500 750V 1V 0 75 5 2 5 N A 1 MΩ OHM Range Resolution Accuracy Over Load Protection 5 kΩ 0 001 kΩ 50 kΩ 0 01 kΩ 500 kΩ 0 1 kΩ 0 5 5 5 MΩ 0 001 MΩ 0 75 10 600V DC or AC rms Continuity Buzzer Test Voltage Threshold Over Load Protection 1 7V 100 digits 600V DC or AC rms Frequency Range Resolution Accuracy Overload protection 1...

Page 13: ...381295 381295 220 V1 3 5 06 13 RPM Range Resolution Accuracy 240 60 000 1 RPM 0 05 5 Pulse Width Range 2uS 500mS Pulse Width 2uS Duty Range 25 75 ...

Page 14: ... indicator BATTERY Low battery indicator BUZZER Buzzer indicator 2 Primary Numerical Field DMM Function Displays numerical readings 3 Trigger selection Channel A B and External 3 1 Trigger level indicator 3 2 Trigger Cursor 4 Trigger Slope Rising or Falling edge 5 Trigger mode Normal or AUTO 6 Channel mode status Verticle mode CHA CHB A B Horizontal mode Normal Roll 7 Memory Address 0 to 15 8 Live...

Page 15: ...or downward This button also decreases the value of a selection Move the cursor to the left with this button Pressing this button changes Vertical division or horizontal division from MANUAL to AUTO Move the cursor to the right with this button Pressing this button changes Vertical division or horizontal division from MANUAL to AUTO 16 DIV Division key Set Channel A and B Horizontal Division A div...

Page 16: ...ON and OFF 19 i Help key Provides meter model number firmware version serial number calibration date and manufacture date 20 I O Power switch Turns the instrument ON or OFF hold for 3 seconds to turn on 21 FUNC Function Key Set Scope Auto Scope and Setup of the METER Scope Setup Exit F1 F2 F3 F4 Scope Setup FUNC F1 Scope SCOPE SETUP INPUT A INPUT B DC AC DC AC VERTICAL MODE CHA CHB A B HORIZONTAL ...

Page 17: ...t jacks CHA Channel A Use the red channel A terminal for all single input measurements COM Common Use the black COMMON terminal as signal ground for DCV ACV Ohm Continuity frequency and RPM measurements CHB Channel B When measuring two signals use channel B and channel A EXT TRIG External trigger ...

Page 18: ... Press Backlight ON 2 Press Backlight OFF Note Using the meter without the backlight increases battery life by 1 hour approximately Selecting items in a Menu Follow steps through to open a menu and choose an item Press FUNC to open the FUNCTION menu Scope SetUp Exit F1 F2 F3 F4 Press F1 to open the Scope Setup menu SCOPE SETUP INPUT A INPUT B DC AC DC AC VERTICAL MODE CHA CHB A B HORIZONTAL MODE N...

Page 19: ...C VERTICAL MODE CHA CHB A B HORIZONTAL MODE NORM ROLL MEASUREMENTS A DCV ACV OHM BZ HZ RPM P W DTY Set Exit Press to Highlight Hz Hz F3 Set F4 Exit Observe that Hz is now the main reading Holding freezing the display screen You can freeze the screen all readings and waveforms at any time Default Command Menu Display A B Mem Hold F1 F2 F3 F4 F4 freeze the screen Highlighted Hold appears at the bott...

Page 20: ...Div is changed to manual mode or Change Div from Manual mode to AUTO mode Changing the Time Base DIV Open the Command Menu A div B div H div Exit F1 F2 F3 F4 F3 Change the Horizontal division A div B div H div Exit F1 F2 F3 F4 Increase the number of periods Div is changed to manual mode Decrease the number of periods Div is changed to manual mode or Change Div from Manual mode to AUTO mode Test Eq...

Page 21: ...SUREMENTS A DCV ACV OHM BZ HZ RPM P W DTY Set Exit F1 F2 F3 F4 Recording Slow Signals over a Long Period of Time Highlight ROLL MODE F3 Set ROLL MODE F4 Exit The roll mode function supplies a visual log of waveform activity and is especially useful when measuring lower frequency waveforms Note ROLL MODE operates when the horizontal division is between 1s and 5s Selecting AC Coupling for INPUT A Hi...

Page 22: ...er parameters currently used Trigger icons on the screen indicate the trigger level and slope 1 Trigger Channel Channel A or B 2 Slope rising or falling 3 Trigger mode Trigger setting mode Auto or Normal 4 Trigger Level indicator 5 Trigger Cursor 6 Command Menu Trigger level 7 Command Menu Single shot 8 Command Menu Trigger mode Setup Setting Trigger level on NORmal trigger mode TRIG Open the Trig...

Page 23: ...RIG Open the Trigger menu Tlvl Singl Tmode Exit F1 F2 F3 F4 F2 Highlight Singl SINGLE SHOT Tlvl Singl Tmode Exit F1 F2 F3 F4 Meter performs a single shot One time screen update F2 Return to normal Trigger mode Setting Trigger mode Tmode TRIG Open the Trigger menu Tlvl Singl Tmode Exit F1 F2 F3 F4 F3 Open the Trigger Setup TRIGGER SETUP SOURCE CHA CHB EXT SLOPE TRIGGER MODE AUTO NOR Set Exit F1 F2 ...

Page 24: ...lly To optimize the trigger slope manually F3 Open the Trigger Setup TRIGGER SETUP SOURCE CHA CHB EXT SLOPE TRIGGER MODE AUTO NOR Set Exit F1 F2 F3 F4 Highlight AUTO F3 Set AUTO F4 Exit Setting Normal Trigger mode Highlight NOR F3 Set NOR F4 Exit Adjust the Trigger Level continuously Observe the horizontal trigger icon on the rightmost time division line ...

Page 25: ...F3 Open the memory Mem menu Sto Rcl Exit F1 F2 F3 F4 Memory field M 00 appears at the top right corner of the display area Select the memory address where the screen is to be stored F1 Store the actual screen Recalling Screen F3 Open the memory menu Sto Rcl Exit F1 F2 F3 F4 Memory field M 00 appears at the top right corner of the display area Select the memory address from which to recall the scre...

Page 26: ...eter to the PC using the supplied communication cable The TRS tip ring sleeve phono plug end of the cable connects to the meter top and the 9 pin end connects to the PC serial port Installing the Supplied Datalogging Software Install the software by placing the supplied diskette in the PC floppy drive Run the SETUP EXE file from the list of files on the diskette Follow the on screen instructions f...

Page 27: ...ns explained below FILE Under FILE click on EXIT to close the program SETUP Under SETUP select COMM to choose the PC COMM port and the baud rate Select PRINTER to configure the line printer Select COLOR to choose the display color configuration WINDOW Select DATALOGGER to open the Data View recording window see below ...

Page 28: ...pear in the Data View window If not check that the proper COMM PORT is selected under SETUP Once the datalogger is started and the data points are appearing in the Data View window the software program s remote control virtual pushbuttons can be used Data View Window Operation In the Data View window shown above the data points can be stored in a file using the SAVE button When the SAVE button is ...

Page 29: ... the test leads and probes before replacing the battery pack Note This instrument contains a NI MH battery pack Do not dispose of this battery pack with other solid waste Used batteries should be disposed of by a qualified recycler or hazardous materials handler To replace the battery pack 1 Disconnect the test leads and probes both at the source and at the meter 2 Loosen the screws with a screwdr...

Page 30: ...381295 381295 220 V1 3 5 06 30 Replacing the Battery ...

Page 31: ...the power source while the instrument is on Wait 15 minutes and then restore power and retry 3 If you still experience difficulty check your connections and reread this instruction manual 4 If the meter s display is frozen when trying to control the trigger level In normal NOR mode the trigger level must be the same level as the waveform The Meter does not trigger if the trigger level is set above...

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