OPERATING INSTRUCTIONS MODEL 2708B DIGITAL MULTIMETER
Contents
1. 34V ranges 2 0 rdg 8 dgts 50 500Hz on 340V 600V ranges Input impedance 3 4V gt 10MQ 34V 750V 9 1MO Overload protection 1000VDC or 750VAC rms CURRENT Ranges 340uA 3400uA 34mA 340mA 10A Resolution 0 1uA DC accuracy 2 0 rdg 2 dgts on 340uA to 340mA ranges 3 0 rdg 3 dgts on 10A range AC accuracy TRUE RMS 50Hz 500Hz 2 5 rdg 10 dgts on 340uA to 340mA ranges 3 5 rdg 10 dgts on 10A range Voltage burden 0 2V on 340uA 34mA 10A ranges 2V on 3400uUA 340mA ranges Input protection 0 5A 500V fast blow ceramic fuse 10A 600V fast blow ceramic fuse 10A Input 10A for 60 seconds maximum followed by a 10 minute cooling period RESISTANCE Ranges 3400 3 4kO 34kO 340kQ 3 4MQ 34MQ Resolution 0 10 Accuracy 1 5 rdg 4 dgts on 3400 to 340kQ ranges 2 5 rdg 4 dgts on 3 4MQ range 5 0 rdg 5 dgts on 34MQ range Open circuit volts 0 45Vdc 1 2Vdc on 3400 range Overload protection 500VDC or AC rms DIODE TEST Test current 1 0mA approximate Accuracy 3 0 rdg 3 dgts Resolution 10mV Audible indication lt 0 25V Open circuit volts 3 0Vdc typical Overload protection 500VDC or AC rms CONTINUITY Audible indication Less than 350 Response time 500ms Overload protection 500VDC or AC rms OPERATION Before taking any measurements read the Safety Information Section Always examine the instrument for damage contamination excessive dirt grease etc and2. defects Examine the test leads for cracked or frayed insulation If any abnormal conditions exist do not attempt to make any measurements Input Warning Beeper The meter has a beeper that warns the user when the test lead is in the current jack while the meter is switched to make a voltage measurement Another safety feature to protect the meter and you Data Hold Press HOLD button to lock the reading on display and release it by pressing the button again Manually Selecting Range The meter also has a manual range mode In manual range you select and lock the meter in a range To manually select a range Press RANGE button to hold the selected range Subsequently pressing the RANGE button will select each range in sequence from the lowest to highest range Hold the button for 2 seconds to return to the Autorange Mode Voltage Measurements 1 Connect the red test lead to VQ jack and the black test lead to the COM jack 2 Set the Function Range switch to the desired voltage type AC or DC and range If magnitude of voltage is not known set switch to the highest range and reduce until a satisfactory reading is obtained 3 Connect the test leads to the device or circuit being measured 4 For dc a sign is displayed for negative polarity positive polarity is implied Current Measurements 1 Connect the red test lead to the uA mA or 10A jack and the black test lead to the COM jack 2 Set the Function Range
3. the resistance is less than approximately 350 Auto Power Off 1 Auto power off approx 10 minutes 2 After auto power off press any button to restart the meter and the reading of measurement will be maintained in the display Cancellation of Auto Power Off Feature Press and hold the RANGE button while rotating function switch from off to any position to turn the meter on The auto power off feature is disabled Note APO annunciator is missing from the LCD MAINTENANCE WARNING Remove test leads before changing battery or fuse or performing any servicing Battery Replacement Power is supplied by a 9 volt battery NEDA 1604 IEC 6F22 The E I appears on the LCD display when replacement is needed To replace the battery remove the three screws from the back of the meter and lift off the front case Remove the battery from case bottom Fuse Replacement If no current measurements are possible Check for a blown overload protection fuse For access to fuses remove the three screws from the back of the meter and lift off the front case Replace F1 only with the original type 0 5A 500V fast acting ceramic fuse 6 35x32mm Replace F2 only with the original type 10A 600V fast acting ceramic fuse 6 35x25 4mm Cleaning Wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Dirt or moisture in the terminals can affect readings CE Safety Conforms to IEC61010 1 EN61010 1 C
4. ATII 1000V CATIII 600V Class Il Pollution degree 2 Indoor use CATII Is for measurements performed on circuits directly connected to the low voltage installation CAT Ill Is for measurements performed in the building installation EMC Conforms to EN61326 The symbols used on this instrument are A Caution refer to accompanying documents Equipment protected throughout by Double insulation Class I Alternating current Direct current Ground
5. ONS Display 3 digit liquid crystal display LCD with a maximum reading of 3400 Analog bar graph 34 segments with measurements 12 times per second Polarity Automatic positive implied negative polarity indication Overrange OL or OL is displayed Zero Automatic Low battery indication The is displayed when the battery voltage drops below the operating level Measurement rate 2 times per second nominal Auto power off Approx 10 minutes Operating environment 0 C to 50 Cat lt 70 relative humidity Storage temperature 20 C to 60 C 0 to 80 relative humidity Accuracy Stated accuracy at 23 C 5 C lt 75 relative humidity Temperature Coefficient 0 1 x specified accuracy per C C to 18 C 28 C to 50 C Altitude 6561 5 feet 2000m Power Single standard 9 volt battery NEDA 1604 JIS 006P IEC 6F22 Battery life 150 hours typical with carbon zinc Dimensions 165mm H x78mm W x42 5mm D Weight Approx 10 00z 285g including holster Accessories One set test leads one spare fuse 9V battery installed and Operating Instructions DC VOLTS Ranges 340mV 3 4V 34V 340V 1000V Resolution 0 1mV Accuracy 1 0 rdg 2dgts Input impedance 340mV gt 100MOQ 3 4V 10MQ 34V 1000V 9 1MO Overload protection 1000VDC or 750VAC rms AC VOLTS TRUE RMS 50Hz 1kHz Ranges 3 4V 34V 340V 750V Resolution 1mV Accuracy 2 0 rdg 8 dgts 50 1kHz on 3 4V
6. OPERATING INSTRUCTIONS MODEL 2708B DIGITAL MULTIMETER APO HOLD RANGE gt e f dB 0 10 20 30 h hnne TRUE RMS AUTO POWER OFF SAFETY INFORMATION The following safety information must be observed to ensure maximum personal safety during the operation at this meter Use the meter only as specified in this manual or the protection provided by the meter might be impaired Test the meter on a known voltage before using it to determine if hazardous voltage is present Do not use the meter if the meter or test leads look damaged or if you suspect that the meter is not operating properly Never ground yourself when taking electrical measurements Do not touch exposed metal pipes outlets fixtures etc which might be at ground potential Keep your body isolated from ground by using dry clothing rubber shoes rubber mats or any approved insulating material Turn off power to the circuit under test before cutting unsoldering or breaking the circuit Small amounts of current can be dangerous Use caution when working above 60V dc or 30V ac rms Such voltages pose a shock hazard When using the probes keep your fingers behind the finger guards on the probes Measuring voltage which exceeds the limits of the multimeter may damage the meter and expose the operator to a shock hazard Always recognize the meter voltage limits as stated on the front of the meter SPECIFICATI
7. switch to the DC or AC ranges 3 Remove power from the circuit under test and open the normal circuit path where the measurement is to be taken Connect the meter in series with the circuit 4 Apply power and read the value from the display Resistance Measurements 1 Set the Function Range switch to the desired resistance range 2 Remove power from the equipment under test 3 Connect the red test lead to the VQ jack and the black test lead to the COM jack 4 Connect the test leads to the points of measurements and read the value from the display Diode Tests 1 Connect the red test lead to the VQ jack and the black test lead to the COM jack 2 Set the Function Range switch to the position 3 Turn off power to the circuit under test External voltage across the components causes invalid readings 4 Touch probes to the diode A forward voltage drop is about 0 6V typical for a silicon diode 5 Reverse probes If the diode is good OL is displayed If the diode is shorted 000 or another number is displayed 6 If the diode is open OL is displayed in both directions 7 Audible Indication Less than 0 25V Continuity Measurements 1 Set the Function switch to the s position 2 Turn off power to the circuit under test External Voltage across the components causes invalid reading 3 Connect the test leads to the two points at which continuity is to be tested The buzzer will sound if
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