Extech Instruments EX540-NIST User manual

User Manual
Wireless TRMS Multimeter
Model EX540

AdditionalUserManualTranslationsavailableatwww.extech.com

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Introduction
This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency
(electrical & electronic), Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. It
can store and recall data. It features a waterproof, rugged design for heavy duty use. This meter can
transmit data wirelessly when linked to a PC. Proper use and care of this meter will provide many
years of reliable service.
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.
This WARNING symbol indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
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) 1000 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
WARNING
CAUTION
MAX
1000V

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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
Function Maximum Input
V DC or V AC 1000VDC/AC rms
mA AC/DC 500mA 1000V fast acting fuse
A AC/DC 10A 1000V fast acting fuse (20A for 30 seconds max
every 15 minutes)
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity 1000VDC/AC rms
Temperature 1000VDC/AC rms
Surge Protection: 8kV peak per IEC 61010
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 1000V 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.

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Controls and Jacks
1. 40,000 count LCD display
2. STORE(<RECALL) button
3. MAX/MIN (-) button
4. MODE button
5. RANGE(SETUP) button
6. Function switch
7. mA, µA and 10A input jacks
8. COM input jack
9. Positive input jack
10. Backlight button
11. EXIT(AC+DC) button
12. HOLD(PEAKHOLD>) button
13. REL (+) button
Note: Tilt stand and battery compartment are on rear of unit.
Symbols and Annunciators
•))) Continuity
Diode test
Battery status
n nano (10-9) (capacitance) 
µ micro (10-6) (amps, cap)
m milli (10-3) (volts, amps)
A Amps
k kilo (103) (ohms)
F Farads (capacitance)
M mega (106) (ohms) RF transmitter active
 Ohms PEAK Peak Hold
Hz Hertz (frequency) V Volts
% Percent (duty ratio) Relative
AC Alternating current AUTO Autoranging
DC Direct current HOLD Display hold
ºF Degrees Fahrenheit ºC Degrees Centigrade
MAX Maximum MIN Minimum
N0. Serial number S second
SET Set up parameter AC+DC Alternating current + Direct current
TRMS True RMS STO Store
RCL Recall AUTO Auto Range
Auto Power off enabled Backlight
1
2
3
4
5
6
7
13
12
11
10
9
8

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Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very 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.
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. Set the function switch to the VDC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
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 VOLTAGE (FREQUENCY, DUTY CYCLE) MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts
inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As
a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the
probe tips are touching the metal contacts inside the outlet before assuming that no voltage is
present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
1. Set the function switch to the VAC/Hz/% position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert red test lead banana plug into the positive Vjack.
3. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
4. Read the voltage in the main display and the frequency in the right
auxiliary display
5. Press the MODE button to indicate “Hz”.
6. Read the frequency in the main display.
7. Press the MODE button again to indicate “%”.
8. Read the % of duty cycle in the main display.
9. With ACV in the main display, press EXIT for 2 seconds to measure AC+DC.

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mV VOLTAGE MEASUREMENTS
CAUTION: Do not measure mV voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
1. Set the function switch to the mV position.
2. Press the MODE button to indicate “DC” or “AC”, or in AC range press EXIT for
two seconds and chose ”AC+DC”
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
4. 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.
5. Read the mV voltage in the main display.
6. With AC mV in the main display, press EXIT for 2 seconds to measure AC+DC.
DC CURRENT MEASUREMENTS
CAUTION: Do not make 20A current measurements for longer than 30 seconds. Exceeding 30
seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA DC, set the function switch to the µA
position and insert the red test lead banana plug into the µA/mA jack.
3. For current measurements up to 400mA DC, set the function switch to the mA
position and insert the red test lead banana plug into the µA/mA jack.
4. For current measurements up to 20A DC, set the function switch to the 10A/HZ/%
position and insert the red test lead banana plug into the 10A jack.
5. Press the MODE button to indicate “DC” on the display.
6. Remove power from the circuit under test, then open up the circuit at the point
where you wish to measure current.
7. 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.
8. Apply power to the circuit.
9. Read the current in the display.

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AC CURRENT (FREQUENCY, DUTY CYCLE) MEASUREMENTS
CAUTION: Do not make 20A current measurements for longer than 30 seconds. Exceeding 30
seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA AC, set the function switch to the µA
position and insert the red test lead banana plug into the µA/mA jack.
3. For current measurements up to 400mA AC, set the function switch to the mA
position and insert the red test lead banana plug into the µA/mA jack.
4. For current measurements up to 20A AC, set the function switch to the 10A/HZ/%
position and insert the red test lead banana plug into the 10A jack.
5. Press the MODE button to indicate “AC” on the display.
6. Remove power from the circuit under test, then open up the circuit at the point
where you wish to measure current.
7. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display. In the 10AAC range, right auxiliary display frequency.
10. Press and hold the MODE button to indicate “Hz”.
11. Read the frequency in the display.
12. Momentarily press the MODE button again to indicate “%”.
13. Read the % duty cycle in the display.
14. Press and hold the MODE button to return to current measurement.
10. With ACA in the main display, press EXIT for 2 seconds to measure AC+DC.
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. Set the function switch to the ΩCAP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. Press the MODE button to indicate “”on the display.
4. Touch the test probe tips across the circuit or part under test. It is best to
disconnect one side of the part under test so the rest of the circuit will not
interfere with the resistance reading.
5. Read the resistance in the display.

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CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits or wires that have
voltage on them.
1. Set the function switch to the ΩCAP 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“ "and “Ω”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 approximately 35, the audible signal will sound. If
the circuit is open, the display will indicate “OL”.
DIODE TEST
1. Set the function switch to the ΩCAP position.
2. Insert the black test lead banana plug into the negative COM jack and the red
test lead banana plug into the positive Vjack.
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.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all
capacitors before taking any capacitance measurements. Remove the batteries and unplug the
line cords.
1. Set the rotary function switch to the ΩCAP position.
2. Insert the black test lead banana plug into the negative COM jack.
3. Insert the red test lead banana plug into the positive Vjack.
4. Press the MODE button to indicate “F”
5. Touch the test leads to the capacitor to be tested.
6. Read the capacitance value in the display

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TEMPERATURE MEASUREMENTS
1. Set the function switch to the Temp position.
2. Insert the Temperature Probe into the input jacks, making sure to observe the
correct polarity.
3. Press the MODE button to indicate “ºF” or “ºC”
4. Touch the Temperature Probe head to the part whose temperature you wish
to measure. Keep the probe touching the part under test until the reading
stabilizes (about 30 seconds).
5. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini connector. A mini connector to banana
connector adaptor is supplied for connection to the input banana jacks.
FREQUENCY (DUTY CYCLE) MEASUREMENTS (ELECTRONIC)
1. Set the rotary function switch to the Hz/% position.
2. Insert the black lead banana plug into the negative COM jack and the red test lead banana
plug into the positive Hz jack.
3. Touch the test probe tips to the circuit under test.
4. Read the frequency on the display.
5. Press the MODE button to indicate “%”.
6. Read the % duty cycle in the display.
% 4 – 20mA MEASUREMENTS
1. Set up and connect as described for DC mA measurements.
2. Set the rotary function switch to the 4-20mA% position.
3. The meter will display loop current as a % with 0mA=-25%, 4mA=0%, 20mA=100%, and
24mA=125%.
AUTORANGING/MANUAL RANGE SELECTION
When the meter is first turned on, it automatically goes into AutoRanging. 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 key. The “AUTO” display indicator will turn off.
2. Press the RANGE key to step through the available ranges until you select the range you want.
3. To exit the Manual Ranging mode and return to Autoranging, press EXIT
Note: Manual ranging does not apply for the Temperature functions.
MAX/MIN
1. Press the MAX/MIN key to activate the MAX/MIN recording mode. The display icon "MAX" will
appear. The meter left auxiliary display will display and hold the maximum reading and will
update only when a new “max” occurs. The display icon "MIN" will appear. The right auxiliary
display meter will display and hold the minimum reading and will update only when a new “min”
occurs.
2. To exit MAX/MIN mode press EXIT

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RELATIVE MODE
The relative measurement feature allows you to make measurements relative to a stored reference
value. A reference voltage, current, etc. can be stored and measurements made in comparison to
that value. The displayed value is the difference between the reference value and the measured
value.
1. Perform the measurement as described in the operating instructions.
2. Press the REL button to store the reading in the display and the "▲" indicator will appear on
the display.
3. The Right auxiliary display displays the initial reading (the stored value)
4. The Left auxiliary display displays the actual currently measured value.
5. Main display displays the Relative value (currently measured value minus the stored value).
DISPLAY BACKLIGHT
Press the key to turn the backlight on. The backlight will automatically turn off after SET time.
Press the EXIT button to exit the backlight on mode.
HOLD
The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or
to exit the HOLD function.
PEAK HOLD
The Peak Hold function captures the peak AC or DC voltage or current. The meter can capture
negative or positive peaks as fast as 1 millisecond in duration.
Set the rotary dial to your preferred setting. Press and Hold the HOLD button for 3 seconds and
release. Now momentarily press the HOLD button, “PEAK” will appear along with “MAX” that will
display in left auxiliary display and MIN” will display in right auxiliary display. Momentarily press
the HOLD button again and “PEAK Hold” will appear. The meter will update the dispay each time a
higher or lower peak occurs. Press the EXIT button to exit the PEAK mode. Auto Power Off
feature will be disabled automatically in this mode.
DATA STORAGE
1. Set the function switch to the measurement function desired.
2. Press the STORE button to enter the STORE function. The left upper aux display indicates the
current storage location (0000 to 9999). New measurements will begin storing into the next
location.
3. Press the PEAKHOLD button to change into the initial storage number 0000. (Press it again to
change back). On the right upper aux display shows XXXX which states how many current
storage locations are used.
4. Press STORE button again to enter into recording interval time set up function.
5. The left upper aux display indicates 0000 S, which is the recording sample rate; use the + & -
buttons to select the sample rate desired (0 to 255 sec)
6. Set the sample rate to 0000 S for manual recording. In this mode, each press of the STORE
button will save one measurement reading.
7. Set the sample rate to 1 to 255 S for automatic recording. In this mode, pressing the STORE
button will start data recording at the set sample rate.
8. Press the EXIT button to end the recording session.

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DATA STORAGE RECALL
1. Press STORE button for two seconds to enter into RECALL function.
2. On the left upper aux display will show XXXX, which is the current storage location. The right
aux display will show XXXX, which is the number of storage locations currently used.
3. Press the + or — button to select the storage location. The value in that location will be
indicated in the main display.
4. Press the PEAKHOLD button once to continuously scan data from 0000 to XXXX. Press again
then scan again.
5. Press the EXIT button to end the recall session.
CLEARING MEMORY
To clear the memory of all stored data, from the OFF position, hold the EXIT button and switch the
function switch to any position. Release the EXIT button and the LCD will flash 3 times and a buzzer
will beep three times. Memory is now clear.
PC WIRELESS COMMUNICATION:
1. Install and launch the pc software
2. Press and Hold the backlight button for two seconds to enter RF wireless transmit mode.
3. The RF icon will appear on the display.
4. When communication is established, the RF icon on the display will blink and the led indicator
on the receiver will also blink.
5. Once per second, the data will be displayed on the pc screen, plotted and inserted into a list.
6. Hold the backlight button for two seconds to exit the RF wireless transmit mode
SENDING STORED DATA TO THE PC
1. Launch the pc software
2. Press the STORE button for two seconds to enter into data RECALL function.
3. Press the HOLD button for two seconds. The RF transmit icon will flash while the stored data is
sent to the pc
SETUP
1. Press and Hold the RANGE/SETUP button for two seconds to enter the SET function. The first
of five settable functions will appear.
2. Press the RANGE button to step through the functions
A: Upper limit buzzer alarm OFF or Value
B: Lower limit buzzer alarm OFF or Value
C: Auto power off time OFF, 10 to 30 sec
D: Button beeper ON/OFF
E: Back light time OFF, 10 to 30 sec
Use the +, - ◄, and ◄buttons to select and change conditions and digits.
3. Press the RANGE/SETUP button until the meter returns to the normal display to exit this mode.
AC+DC
In the measuring modes VAC, mV(AC), 10A(AC), mA(AC) and uA(AC), press the EXIT button for 2
seconds to enter into AC+DC testing. The precision is the same as in the AC measure modes. The
LCD shows AC+DC icon. Press the EXIT button to exit the mode.
LOW BATTERY INDICATION
When the icon appears in the display, the battery should be replaced

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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 your 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 performed:
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.

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BATTERY INSTALLATION
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. Open the rear battery cover by removing two screws (B) using a Phillips head screwdriver.
3. Insert the battery into battery holder, observing the correct polarity.
4. Put the battery cover back in place. Secure with the screws.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection
sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to
take end-of-life devices to a designated collection point for the disposal of electrical and
electronic equipment.
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and
fastened securely.
NOTE: If your meter does not work properly, check the fuses and batteries to make sure that they are
still good and that they are properly inserted.
AA
A
B
B
F1 F2

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REPLACING THE FUSES
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before
removing the meter cover.
1. Disconnect the test leads from the meter.
2. Remove the protective rubber holster.
3. Remove the battery cover (two “B” screws) and the battery.
4. Remove the six “A” screws securing the rear cover.
5. Gently remove the old fuse and install the new fuse into the holder.
6. Always use a fuse of the proper size and value 0.5A/1000V fast blow for the 400mA range [SIBA
70-172-40.0,5] (6.3x32mm), 10A/1000V fast blow for the 20A range [SIBA 50-199-06.10]
(10x38mm).
7. Replace and secure the rear cover, battery and battery cover.
WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in place and
fastened securely.
FCC Part 15
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
—Consult the dealer or an experienced radio/TV technician for help.
Warning: Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.

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Specifications
Function Range Resolution Accuracy
DC Voltage 400mV 0.01mV
(0.06% reading + 2 digits)
4V 0.0001V
40V 0.001V
400V 0.01V
1000V 0.1V (0.1% reading + 2 digits)
AC Voltage
(AC+DC)
50 to 1000Hz
400mV 0.01mV (1.0% reading + 4digits)
4V 0.0001V
(1.0% reading + 3digits)
40V 0.001V
400V 0.01V
1000V 0.1V
All AC voltage ranges are specified from 5% of range to 100% of range
DC Current 400A 0.01A
(1.0% reading + 3 digits)
4000A 0.1A
40mA 0.001mA
400mA 0.01mA
10A 0.001A
(20A: 30 sec max with reduced accuracy)
AC Current
(AC+DC)
50 to 1000Hz
400A 0.01A
(1.5% reading + 3 digits)
4000A 0.1A
40mA 0.001mA
400mA 0.01mA
10A 0.001A
(20A: 30 sec max with reduced accuracy)
All AC voltage ranges are specified from 5% of range to 100% of range
NOTE: Accuracy is stated at 18oC to 28oC (65oF to 83oF) and less than 75% RH.

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Function Range Resolution Accuracy
Resistance 4000.01(0.3% reading + 9 digits)
4k0.0001k
(0.3% reading + 4 digits)
40k0.001k
400k0.01k
4M0.001M
40M0.001M(2.0% reading + 10 digits)
Capacitance 40nF 0.001nF (3.5% reading + 40 digits)
400nF 0.01nF
4F 0.0001F
(3.5% reading + 10 digits)
40F 0.001F
400F 0.01F
4000µF 0.1µF (5% reading + 10 digits)
40mF 0.001mF
Frequency
(electronic)
40Hz 0.001Hz
(0.1% reading + 1 digits)
400Hz 0.01Hz
4kHz 0.0001kHz
40kHz 0.001kHz
400kHz 0.01kHz
4MHz 0.0001MHz
40MHz 0.001MHz
100MHz 0.01MHz Not specified
Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle and <100kHz; 5Vrms min @
20% to 80% duty cycle and > 100kHz.
Frequency
(electrical)
40.00HZ-4KHz 0.01HZ to
0.001KHz
(0.5% reading)
Sensitivity:5Vrms
Duty Cycle 0.1 to 99.90% 0.01% (1.2% reading + 2 digits)
Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz
Temp
(type-K)
-58 to 1382F 0.1F (1.0% reading + 4.5°F)
(1.0% reading + 2.5°C)
(probe accuracy not included)
-50 to 750C 0.1C
4-20mA% -25 to 125% 0.01% ±50 digits
0mA=-25%, 4mA=0%, 20mA=100%, 24mA=125%
Note: Accuracy specifications consist of two elements:
(% reading) – This is the accuracy of the measurement circuit.
(+ digits) – This is the accuracy of the analog to digital converter.

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Enclosure Double molded, waterproof (IP67)
Shock (Drop Test) 2 meters (6.5 feet)
Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical
Storage capacity 9999 records
RF transmit distance 10 meters (approx)
Transmitter Frequency 915MHz
Continuity Check Audible signal will sound if the resistance is less than 35(approx.), test
current <0.35mA
Peak Captures peaks >1ms
Temperature Sensor Requires Type K thermocouple
Input Impedance >10MΩVDC & >9MΩVAC
AC Response True rms
ACV Bandwidth 50Hz to 1000Hz
Crest Factor ≤3 at full scale up to 500V, decreasing linearly to ≤1.5 at 1000V
Display 40,000 count, backlit, liquid crystal with bargraph
Overrange indication “OL” is displayed
Auto Power Off 15 minutes (approximately) with disable feature
Polarity Automatic (no indication for positive); Minus (-) sign for negative
Measurement Rate 2 times per second, nominal
Low Battery Indication “ ” is displayed if battery voltage drops below operating voltage
Battery One 9 volt (NEDA 1604) battery
Fuses mA, µA ranges; 0.5A/1000V ceramic fast blow (6.3x32mm)
A range; 10A/1000V ceramic fast blow (10x38mm)
Operating Temperature 5ºC to 40ºC (41ºF to 104ºF)
Storage Temperature -20oC to 60oC (-4oF to 140oF)
Operating Humidity Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC (104ºF)
Storage Humidity <80%
Operating Altitude 2000meters (7000ft) maximum.
Weight 342g (0.753lb) (includes holster).
Size 187 x 81 x 50mm (7.36” x 3.2” x 2.0”) (includes holster)
Safety This meter is intended for origin of installation use and protected, against
the users, by double insulation per EN61010-1 and IEC61010-1 2nd Edition
(2001) to Category IV 600V and Category III 1000V; Pollution Degree 2.
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