TRIPLETT Model 310-TEL Type 3 Hand-Sized VOM Instruction Manual TRIPLETT
TABLE OF CONTENTS SAFETY RULES ............................................... 3 INTRODUCTION .............................................. 9 SPECIFICATIONS ........................................... 10 GENERAL INSTRUCTIONS ................................ 12 Test Leads ............................................. 12 Range Selection ...................................... 12 Scale Selection ....................................... 13 Polarity Selection ....................................
SAFETY RULES • WARNING This tester has been designed with your safety in mind. However, no design can completely protect against incorrect use. Electrical circuits can be dangerous and/ or lethal when lack of caution or poor safety practices are used. WARNING This meter is NOT to be used to measure High Energy circuits (power circuitry fused at greater than 4KW, such as distribution circuits, power entrance circuits, etc.) or circuits classified by CE as CATEGORY III (CAT III).
• Do not use this meter with its battery cover open, its rear case open, or with parts removed. • Do not open this meter for maintenance without first disconnecting the test leads from all external circuitry. • Repairs and maintenance must only be carried out by qualified service personnel or qualified electricians / technicians who know the dangers of, and the safety rules applicable to this type of equipment. • Use caution when measuring circuits containing capacitors.
• Make sure both test leads are fully inserted into their respective input jacks (Black lead into COM and Red lead into V•O•M). A loose test lead may cause the user to misinterpret the dangers present (the meter may read Zero when dangerous voltage is present) or the loose lead may accidentally short to other circuitry or shock the user. • Do not use the meter if either the meter or the test leads are wet, either from exposure to the weather, or after cleaning the case of the meter.
• Do not use the meter if it does not appear to work correctly on all ranges and in all modes. • Do not use the meter if it has undergone long-term storage under unfavorable conditions. • Do not use the meter if it may have been damaged in transport. • Do not attempt immediate use of the meter when bringing if from a cold environment to a warm environment. Condensation of water, inside and outside of the meter, may produce dangerous measuring conditions.
• Do not mistake a downscale reading as an indication that no potential is present. Dangerous potentials may be present that may result in user injury. • When replacing the battery, dispose of the depleted battery in accordance with any prevailing safety or environmental regulations. • A static charge on the face of the meter may cause the meter to produce inaccurate readings, which could lead to user injury.
DO NOT TOUCH Do not touch exposed wiring, connections or other “live” parts of an electrical circuit. If in doubt, check the circuit first for voltage before touching it. Turn off the power to a circuit before connecting test probes to it. Be sure there is no voltage present before you touch the circuit. Do not use cracked or broken test leads. HIGH VOLTAGE IS DANGEROUS Always start with the power off. Be sure there is no voltage present before making connections to the circuit.
INTRODUCTION The Triplett Model 310-TEL is a handy hand-sized VOM with all the versatility and performance of larger, more expensive bench-size models. It offers diode overload protection against damage to the meter movement caused by accidental overloads. A fuse is used to protect the RX1 range. The fuse and batteries can be easily replaced by removing the back cover.
SPECIFICATIONS DC Volts Ranges: Accuracy: 0-3, 15, 60, 300 (20,000 ohms per volt) ±3% of full scale value AC Volts Ranges: Accuracy: 0-3, 15, 60, 300 (5,000 ohms per volt) ±4% of full scale value (on 60Hz sine wave at 77° F) Ohms Ranges: Accuracy: 0-20K, 200K, 2 Meg, 20 Meg (200, 2K, 20K, 200K @ center scale) ±3% of DC scale length (with fully charged battery) Ohmmeter Specifications: X1 Max Voltage (Volts) 1.6 Max Current (mA) 8.0 Max. Power (mW) 3.2 X10 Range X100 X1K 1.6 1.6 14.0 0.8 .08 .
Meter 50 µA - 250 mV (Pivot and Jewel) Overload Protection Meter movement protected by diodes. RX1 range protected by fuse. Voltage ranges protected by high impedance. Polarity Reversal The Polarity Switch reverses the polarity of the jacks on all ranges. Test Lead Polarity DC Voltage: Lead connected to V•O•M jack is positive with polarity reversal switch in + position. DC Current: Lead connected to V•O•M jack is positive with polarity reversal switch in + position.
GENERAL INSTRUCTIONS Control Locations For a diagram of the Model 310-TEL, please refer to page 15. Test Leads Check the test leads periodically. Leads that are worn, have damaged insulation, damaged plugs, damaged probes or loose parts should be replaced. The following section should be read carefully. It contains instructions and precautions to be observed in making measurements with the tester. The alligator clips provided with the tester fit over the end of the test probes.
Scale Selection Readings are taken on the scale having the appropriate significant figures (both 3 and 300 volts are read on the 0-300 scale) by multiplying or dividing by a factor of 10 or 100 as indicated by the range/scale ratio (i.e., on the 3 volt range, divide the scale readings by 100). See Operation Chart on page 26. Polarity Selection The Polarity Reversing Switch allows the user to electrically reverse the test lead connections.
Other Considerations Readings on the sensitive voltage, current and resistance ranges may sometimes be different than calculated values. Thermo-electric or electro-chemical reactions can sometimes generate voltage (and current) in a circuit due to elevated temperatures, contact of dissimilar metals, chemical fumes or moisture. Also, the user’s fingers should never touch the metal parts of the test probes since body resistance can cause erroneous readings - particularly on the high ohmmeter ranges.
CONTROL LOCATION DIAGRAM DIAL SCALE INDICATOR NEEDLE POLARITY REVERSING SWITCH O ∞ ZERO ADJUSTMENT SCREW BLACK TEST LEAD INPUT JACK RED TEST LEAD INPUT JACK COM V 300 AC V 60 15 DC 300 OHMS ADJUST CONTROL V-O-M OHM S X 3 1 1 X K 0 1 X 0 0 1 60 15 MA X 6 .
DC VOLTAGE MEASUREMENTS 0-3 through 0-300 Volts: 1. Insert the test leads into the appropriate jacks. (Red to V•O•M, Black to COM) 2. Set Range Switch to appropriate DCV range. 3. Set the Polarity Switch to desired polarity. 4. Connect probes across circuit to be measured. 5. Energize circuit. 6. Read voltage on the black AC-DC scale.
DC VOLTAGE MEASUREMENTS POLARITY REVERSING SWITCH ∞ O COM V-O-M OHMS ADJUST CONTROL V DC 300 60 15 3 + SAFETY FIRST! 17
AC VOLTAGE MEASUREMENTS 0-3 through 0-300 Volts: 1. Insert the test leads into the appropriate jacks. (Red to V•O•M, Black to COM) 2. Set Range Switch to appropriate ACV range. 3. Connect probes across circuit to be measured. 4. Energize circuit. 5. Read voltages above 3 Volts on the Black AC-DC Scale. Read voltages below 3 Volts on the Red 3AC Scale (with the VOM set to 3ACV).
AC VOLTAGE MEASUREMENTS POLARITY REVERSING SWITCH ∞ O COM V-O-M V OHMS ADJUST CONTROL AC 300 60 15 3 Set Range to 300 ACV SAFETY FIRST! 19
RESISTANCE MEASUREMENTS X1 through X1K Ohms: 1. Insert the test leads into the appropriate jacks. (Red to V•O•M, Black to COM) 2. Set Range Switch to appropriate OHMS range. 3. Short test probes together. 4. Adjust OHMS ADJUST CONTROL until meter reads zero ohms. 5. Connect probes to the circuit or component to be measured. 6. Read ohms on OHMS scale (multiply value read by multiplier indicated by the switch). 7.
RESISTANCE MEASUREMENTS POLARITY REVERSING SWITCH ∞ O COM V-O-M OHMS ADJUST CONTROL K 1 OHM S X 1 0 X 0 1 X 0 1 X SAFETY FIRST! 21
DC CURRENT MEASUREMENTS 0-.6 through 0-600 Milliamperes: 1. Insert the test leads into the appropriate jacks. (Red to V•O•M, Black to COM) 2. Set Range Switch to appropriate mA range. 3. Connect the probes in series with the circuit to be measured (use alligator clips). 4. Set the Polarity Switch to desired polarity. 5. Turn circuit on. 6. Read current on appropriate black AC-DC scale. The approximate voltage drop (burden voltage) across the Model 310-TEL is shown in the specifications.
DC CURRENT MEASUREMENTS POLARITY REVERSING SWITCH ∞ O COM V-O-M OHMS ADJUST CONTROL MA 6 .
MEASURING OUTPUT VOLTS (dB) POLARITY REVERSING SWITCH ∞ O COM V-O-M V OHMS ADJUST CONTROL AC 300 60 15 3 AUDIO AMPLIFIER 600Ω SAFETY FIRST! To read Output Voltage use the same procedure as shown on page 18 for AC Voltage and convert readings to dB using the chart on page 25.
10 1 .1 20 2 .2 30 3 .3 40 4 .4 50 5 .5 60 6 .6 70 7 .7 –26 –6 +14 V O L T S –24 –4 +16 –22 –2 +18 –20 0 +20 1.89 –18 +2 +22 1.73 –16 +4 +24 0Ω 0Ω 60 –14 +6 +26 –12 +8 +28 DB 50 W 80 8 .8 6M W 6M 90 9 .9 –10 +10 +30 1M 0Ω –8 +12 +32 60 W 100 10 1 –6 +14 +34 –4 +16 +36 –2 +18 +38 .
ACV 3 ACV 15 ACV 60 ACV 300 OHMS X1 OHMS X10 OHMS X100 OHMS X1K 0-3 0 - 15 0 - 60 0 - 300 0 - 20,000 0 - 200,000 0 - 2 Meg 0 - 20 Meg 0 - .6 0-6 0 - 60 0 - 600 AC Volts Ohms DC mA 60 ÷ 100 60 ÷ 10 60 60 x 10 0 - 20K 0 - 20K x 10 0 - 20K x 100 0 - 20K x 1000 3AC 15 60 300 300 ÷ 100 15 60 300 Read On Scale .01 mA .1 mA 1 mA 10 mA .05 Volt .25 Volt 1 Vo lt 5 Volt .05 Volt .25 Volt 1 Volt 5 Volt Each Scale Div.
ACCESSORIES Carrying Cases: Model 369: Cat. No. 10-1258 Model 369-S: Cat. No. 10-1791 Model 369-T: Cat. No. 10-1608 Case w/ Belt Loop: Cat. No. 10-1269 Model 369-V: Cat. No.
Test Leads: 79-153: 79-206: 79-695: 79-722: 42” Test leads w/Screw-on Alligator Clips 48” Test leads with Alligator Clips (no probes) Test leads with Pin Cushion Clips Test leads with Spike Clips MAINTENANCE FOR MODEL 310-TEL Battery Replacement If the pointer cannot be adjusted to full scale on the X1, X10, or X100 OHMS ranges, replace the 1.5V battery. Replace the 12V battery if the X1K OHMS range cannot be adjusted for full scale. 1.
Calibration With normal use, readjustment of this VOM should not be necessary. An occasional check of the VOM against a known reference voltage or another VOM is good practice. If there is a question about the accuracy of the VOM, it should be returned to the factory or an authorized service center for a calibration check. TRIPLETT PRODUCT RETURN INSTRUCTIONS In the unlikely event that you must return your Triplett equipment for repair, the following steps must be taken.
TRIPLETT LIMITED WARRANTY The Triplett Corporation warrants instruments and test equipment manufactured by it to be free from defective material or workmanship and agrees to repair or replace such products which, under normal use and service, disclose the defect to be the fault of our manufacturing, with no charge within three years of the date of original purchase for parts and labor. If we are unable to repair or replace the product, we will make a refund of the purchase price.
Triplett Corporation One Triplett Drive 800-TRIPLETT FAX: 419-358-7956 © Triplett Corporation Bluffton, OH 45817 www.triplett.
