OPERATING INSTRUCTIONS MODEL 2704C DIGITAL MULTIMETER
Contents
1. 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 mA or 10A jack and the black test lead to the COM jack 2 Set the Function Range 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 and Continuity Measurements 1 Set the Function Range switch to the desired resistance range or continuity position 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 CON jack 4 Touch the probes to the test points In ohms the value indicated in the display is the measured value of resistance In continuity test the beeper sounds continuously if the resistance is less than 1000 Note when using 2000MQ Range The 2000MQ range has a fixed 10 count offset in the reading When the test leads are shorted together in this range the meter will display 010 This residual reading must be subtracted from the reading For example when measuring 1100MQ on the 2000MA range the display will read 1100 from which the 10 residual is subtracted to obtain the actual resistance of 1100MQ Diode Tests 1 Connect the red t2. SPECIFICATIONS Display 3 digit liquid crystal display LCD with a maximum reading of 1999 Polarity Automatic positive implied negative polarity indication Overrange OL or OL is displayed Zero Automatic Low battery indication The E is displayed when the battery voltage drops below the operating level Measurement rate 2 5 times per second nominal Operating environment 0 C to 50 C at 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 6562 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 0 02 285g including holster Accessories One set test leads one spare fuse 9V battery installed and Operating Instructions DC VOLTS Ranges 200mV 2V 20V 200V 1000V Resolution 0 1mV Accuracy 0 8 rdg 1 dat Input impedance 10MO Overload protection 1000VDC or 750VAC rms 600VDC AC rms 15 seconds on 200mV range AC VOLTS 50Hz 500Hz Ranges 200mV 2V 20V 200V 750V Resolution 0 1mV Accuracy 1 5 rdg 5 dgts on 200mV to 20V ranges 2 0 rdg 5 dgts on 200V 750V ranges Input impedance 10MQ Overload protection 1000VDC o
3. ATII 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 E Equipment protected throughout by Double insulation Class I Alternating current Direct current ik Ground
4. OPERATING INSTRUCTIONS MODEL 2704C DIGITAL MULTIMETER MAX MIN HOLD L noo O add e kHz MHz FUSED i 200m COM A HzVQ 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
5. est lead to the VQ jack and the black test lead to the COM jack 2 Set the Function Range switch to the p position 3 Turn off power to the circuit under test 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 Capacitance Measurements 1 Set the Function Range switch to the desired F capacitance range 2 Never apply an external voltage to the Cx sockets Damage to the meter rnay result 3 Insert the capacitor directly into the Cx sockets 4 Read the capacitance directly from the display Transistor hFE Measurements 1 Set the Function Range switch to the desired hFE range PNP or NPN type transistor 2 Never apply an external voltage to the hFE sockets Damage to the meter may result 3 Plug the transistor directly into the hFE sockets The sockets are labeled E B and C for emitter base and collector 4 Read the transistor hFE directly from the display Frequency Measurements 1 Set the Function Range switch to the Hz position 2 Connect the red test lead to the VQ jack and the black test lead to the COM jack 3 Connect the test leads to the point of measurement and read the frequency from the display Logic Measurements 1 Set the Function Range s
6. r 750VAC rms 600VDC AC rms 15 seconds on 200mV range CURRENT DC Ranges 20mA 200mA 10A DC Resolution 10uA DC Accuracy 1 0 rdg 1 dgts on 20mA to 200mA ranges 3 0 rdg 3 dgts on 10A range DC Input protection 0 5A 500V fast blow ceramic fuse 10A 600V fast blow ceramic fuse AC Ranges 20mA 200mA 10A 50Hz 500Hz AC Resolution 10uA AC Accuracy 2 0 rdg 5dgts on 20mA to 200mA ranges 3 5 rdg 5 dgts on 10A range AC Input protection 0 5A 500V fast blow ceramic fuse 10A 600V fast blow ceramic fuse 10A AC amp DC Input 10A for 60 seconds maximum followed by a 10 minute cooling period RESISTANCE Ranges 2000 2kQ 200kQ 20MQ 2000MQ Resolution 0 10 Accuracy 1 0 rdg 4 dgts on 2000 to 200kQ ranges 2 0 rdg 4 dgts on 20MQ range 5 0 rdg 10 dgts 10dgts on 2000MO range Open circuit volts 0 3Vdc 3 0Vdc on 2000 2000MA ranges Overload protection 500VDC or AC rms CONTINUITY Audible indication Less than 1000 Response time 100ms Overload protection 500VDC or AC rms DIODE TEST Test current Approx 1 0mA Accuracy 1 5 rdg 3dgts Open circuit volts 3 0Vdc typical Overload protection 500VDC or AC rms CAPACITANCE Ranges 2nF 20nF 200nF 2uF 20uF Resolution 1PF Accuracy 4 rdg 10 dgts Discharge capacitor before connecting TRANSISTOR hFE Range 0 1000 Base current 10uAdc approx Vdc 3 0Vdc FREQUENCY Autoranging Ranges 2kHz 20kH
7. witch to the LOGIC position 2 Connect the red test lead to V Q jack and the black test lead to the COM jack 3 Connect the red test lead to the test point and the black lead to the common buss of the logic circuit 4 A A on the display indicates TTL logic high and a Y indicates a TTL logic low Both indicators are on when the point of measurement is toggling high and low 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 EJ 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 CATII 1000V CATIII 600V Class 11 Pollution degree 2 Indoor use C
8. z 200KHz 2MHz 20MHz Resolution 1Hz Accuracy 0 1 rdg 3 dgts Sensitivity 2 0V RMS min Minimum pulse width 25ns Duty cycle limits gt 30 and lt 70 Overload protection 500VDC or AC rms LOGIC TEST Threshold Logic Hi 2 8 0 8V Logic Lo 0 8 0 5V Indication 40 msec beep at logic low 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 and 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 MAX MIN Press MAX MIN once begins recording MIN and MAX Press MAX MIN to select current reading MIN or MAX Hold down for 2 seconds to exit MAX MIN function 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
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