True RMS Multimeter
Extech EX205T
User Guide
Introduction
Thank you for selecting the Extech EX205T True RMS Auto-ranging Multimeter. This meter measures
AC/DC Voltage, AC/DC Current, Resistance, Diode Test, and Continuity. Proper use and care of this meter will provide many years of reliable service. Please visit the Extech Instruments website
( www.extech.com
) to check for the latest version of this User Guide. Extech Instruments is an ISO-
9001 certified company.
Safety
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 injury or damage to the meter.
WARNING
This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.
CAUTION
MAX
600V
This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product.
This symbol advises the user that the terminal(s) so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds (in this case) 600 VAC or VDC.
This symbol adjacent to one or more terminals identifies them as being associated with ranges that may, in normal use, be subjected to particularly hazardous voltages. For maximum safety, the meter and its test leads should not be handled when these terminals are energized.
This symbol indicates that a device is protected throughout by double insulation or reinforced insulation.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
2 EX205T-en-GB_v1.2 09/15
CAUTIONS
Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter.
Always remove the test leads before replacing the battery or fuses.
Inspect the condition of the test leads and the meter itself for any damage before operating the meter.
Use great care when making measurements if the voltages are greater than 25 VAC rms or 35
VDC. These voltages are considered a shock hazard.
Warning! This is a Class A device. This device can cause interference in residential areas.
Always discharge capacitors and remove power from the device under test before performing
Diode, Resistance or Continuity tests.
Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts. Other means should be used to ensure that the terminals are not "live".
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
This device must not be used by children. It contains hazardous objects as well as small parts that the children could swallow.
Do not leave batteries and packing material lying around unattended; they can be dangerous to children.
In the event that this device will be stored for an extended period of time, remove the batteries.
Expired or damaged batteries can be hazardous to skin. Use suitable hand gloves in such cases.
Do not short-circuit the battery.
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
3 EX205T-en-GB_v1.2 09/15
SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated with caution. The rules listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Input Protection Limits
V AC/DC, Resistance, Diode Test, Continuity
μA or mA AC/DC
A AC/DC
2. USE EXTREME CAUTION when working with high voltages.
600 VDC/AC rms
200mA fused
10A fused
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in the current, resistance, or diode mode. Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before opening the covers to replace the fuse or batteries.
7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely.
8. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
4 EX205T-en-GB_v1.2 09/15
Controls and Jacks
1. 2000 count LCD
5. mA, µA and 10A input jacks
6. Backlight button
10. COM input jack
Note: Tilt stand, test lead holders, and battery compartment are on rear of unit.
Symbols and Enunciators
Continuity
A Amps
Ohms
V Volts
MAX Maximum
AUTO Auto-ranging
5 EX205T-en-GB_v1.2 09/15
Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are extremely dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is not in use.
2. If “OL” appears in the display during a measurement, the value exceeds the range you have selected. Change to a higher range.
AC/DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
1. Rotate the function switch to the V AC or V DC position.
2. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
4. Read the voltage in the display.
AC/DC CURRENT MEASUREMENTS
1. Insert the black test lead banana plug into the negative COM jack.
2. Press the MODE button to indicate “DC” or “AC” on the display.
3. For current measurements up to 2000µA, set the function switch to the µA position and insert the red test lead banana plug into the µA/mA jack.
4. For current measurements up to 200 mA DC, set the function switch to the mA position and insert the red test lead banana plug into the µA/mA jack.
5. For current measurements up to 10A DC, set the function switch to the 10A position and insert the red test lead banana plug into the 10A jack.
6. Connect the test leads in series with the circuit under test.
7. Apply power to the circuit.
8. Read the current in the display.
6 EX205T-en-GB_v1.2 09/15
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords.
1. Rotate the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
3. Touch the test probe tips across the device under test.
4. Read the resistance in the display.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits or wires that have a voltage potential.
1. Rotate the function switch to the position.
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
3. Press the MODE button to indicate“ " on the display
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than the continuity threshold, the audible signal will sound.
DIODE TEST
1. Rotate the function switch to the green position.
2. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive jack.
3. Press the MODE button to indicate “ “and “V” on the display.
4. Touch the test probes to the diode under test. Forward voltage will typically indicate
0.400 to 0.700V. Reverse voltage will indicate “OL”. Shorted devices will indicate near 0V and an open device will indicate “OL” in both polarities.
7 EX205T-en-GB_v1.2 09/15
AUTORANGING/MANUAL RANGE SELECTION
When the meter is first switched on, it automatically enters the Auto-Ranging mode. This automatically selects the best range for the measurements being made and is generally the best mode for most measurements. For measurement situations requiring that a range be manually selected, perform the following:
1. Press the RANGE button. The “AUTO” display indicator will turn off.
2. Press the RANGE key to step through the available ranges until the range desired is selected.
3. Press and hold the RANGE button for 2 seconds to exit manual ranging.
Note: Manual ranging does not apply to the Diode and Continuity functions.
MAX (MAXIMUM READING) MODE
1. Press the MAX button to activate the MAX mode. The display icon "MAX" will appear. The meter will display and hold the maximum reading and will update only when a new maximum value is detected.
2. Press the MAX button again to exit the mode.
Note: Max does not apply to the Resistance, Diode and Continuity functions.
DISPLAY BACKLIGHT
Press and hold the button for 2 second to turn the backlight on. The backlight will automatically turn off after approximately 10 seconds or press and hold the button again for 2 seconds to manually turn it off.
HOLD
The HOLD function freezes the reading in the display. Press the HOLD button momentarily to activate or to exit the HOLD function.
Note: The HOLD button does not function in the IR measurement mode.
AUTO SLEEP
If no button is pressed the auto sleep feature will place the meter in sleep mode after approximately
15 minutes of operation. If this happens, press any button to wake the meter or switch the meter to
OFF if it no longer in use.
8 EX205T-en-GB_v1.2 09/15
Maintenance
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the back cover or the battery or fuse covers.
WARNING: To avoid electric shock, do not operate the meter until the battery and fuse covers are in place and fastened securely.
This MultiMeter is designed to provide years of dependable service, if the following care instructions are followed:
1. KEEP THE METER DRY. If it gets wet, wipe it off.
2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the electronic parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT use chemicals, cleaning solvents, or detergents.
5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove old or weak batteries so they do not leak and damage the unit.
6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the batteries should be removed to prevent damage to the unit.
BATTERY and FUSE Replacement
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover.
1. Turn power off and disconnect the test leads from the meter.
2. Lift the meter stand to expose the battery cover.
3. Open the rear battery/fuse compartment by removing the Phillips head screw on the lower rear of the meter.
4. Carefully pull down on the cover just enough to release the latch and then lift it off. The cover will not pull down all the way.
5. Remove the old battery or fuse and install a new one of the correct rating.
6. Place the battery/fuse cover back in place. Secure with the screw.
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely.
NOTE: If the meter does not work properly, check the fuses and replace the battery to make sure that they are still good and that they are properly inserted.
9 EX205T-en-GB_v1.2 09/15
Specifications
Function Range
DC Voltage 200 mV
Resolution
0.1 mV
Accuracy
(0.8% reading + 6 digits)
2V 0.001V
20V 0.01V
(0.5% reading + 2 digits)
AC Voltage
50/60Hz
200V 0.1V
600V 1V
200 mV 0.1 mV
2V 0.001V
(0.8% reading + 2 digits)
DC Current
20V 0.01V
200V 0.1V
(1.5% reading + 6 digits)
600V 1V
All AC voltage ranges are specified from 5% of range to 100% of range
200 A 0.1
2000 A 1
20 mA
200 mA
0.01 mA
0.1 mA
(1.5% reading + 5 digits)
AC Current
(50/60Hz)
10 A 0.01 A
Note:10A for 30 sec max
200 A 0.1
2000 A 1
20 mA
200 mA
0.01 mA
0.1 mA
(2.5% reading + 5 digits)
(1.5% reading + 8 digits)
(3.0% reading + 5 digits)
10 A 0.01 A
Resistance
Note: 10A for 30 sec max
200 0.1
2 k 0.001
20 k 0.01
(0.8% reading + 5 digits)
(0.8% reading + 2 digits)
200 k 0.1
2 M 0.001
(2.5% reading + 8 digits)
20 M 0.01
NOTE: Accuracy is stated at 18 o C to 28 o C (65 o F to 83 o F) and less than 75% RH.
10 EX205T-en-GB_v1.2 09/15
Enclosure
Diode Test
Double molded
Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical
Continuity Threshold 20 to 50 , test current <1.5mA
Input Impedance 10MΩ VDC/VAC
AC Response
ACV Bandwidth
True rms
40Hz to 1000Hz
Display 2,000 count backlit liquid crystal display
Over-range indication “OL” is displayed
Auto Power Off
Polarity
Measurement Rate
Battery
15 minutes (approximately)
Automatic (no indication for positive); Minus (-) sign for negative
2 times per second, nominal
One 9 volt (NEDA 1604) battery
Fuses mA, µA ranges; 200mA 250V ceramic fast blow
A range; 10A 600V ceramic fast blow
Operating Temperature -10ºC to 40ºC (14ºF to 122ºF)
Storage Temperature -10 o C to 60 o C (14 o F to 140 o F)
Operating Humidity
Storage Humidity
Operating Altitude
Weight
Size
Safety
Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC (104ºF)
<80%
2000 meters (7000 ft) maximum
260 g (9.17 oz.)
147x76x42 mm (5.8x2.9x1.6”)
This meter is intended for origin of installation use and protected, against the users, by double insulation per IEC/EN 61010-1:2001 and IEC/EN
61010-031:2002 to Category III 600V; Pollution Degree 2.
CE Approvals
Copyright © 2013‐2015 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
www.extech.com
11 EX205T-en-GB_v1.2 09/15
