User’s Guide
True RMS Digital Multimeter
Model 22-816
Introduction
Congratulations on your purchase of Extech’s 22-816 true rms Digital
Multimeter. This autoranging meter measures AC/DC Voltage, AC/DC
Current, Resistance, Capacitance, Frequency, Duty Cycle, Temperature,
Diode Test and Continuity. Proper use and care of this meter will provide
many years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal,
indicates the user must refer to the manual for further
information.
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present
Double insulation
Overvoltage Catagory III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE
CATEGORY III. Cat III meters are protected against overvoltage
transients in fixed installation at the distribution level. Examples include
switches in the fixed installation and some equipment for industrial use
with permanent connection to the fixed installation.
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Safety Precautions
1. Improper use of this meter can cause damage, shock, injury or
death. Read and understand this user manual before operating the
meter.
2. Make sure any covers or battery doors are properly closed and
secured.
3. Always remove the test leads before replacing the battery or fuses.
4. Inspect the condition of the test leads and the meter itself for any
damage before operating the meter. Repair any damage before
use.
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are
greater than 25VAC rms or 35VDC. These voltages are considered
a shock hazard.
7. Always discharge capacitors and remove power from the device
under test before performing Capacitance, Diode, Resistance or
Continuity tests.
8. Remove the battery from the meter if the meter is to be stored for
long periods.
9. To avoid electric shock, do not measure AC current on any circuit
whose voltage exceeds 250V AC.
10. Voltage checks on electrical outlets can be difficult and misleading
because of the uncertainty of connection to the electrical contacts.
Other means should be used to ensure that the terminals are not
"live".
Function
V DC, VAC
Ohms, Capacitance, Diode,
Frequency, Continuity
mA DC/AC
10A DC/AC
Input Limits
Maximum Input
1000V DC/ 600V AC
250V DC/AC
400mA DC/AC
10A DC/AC (30seconds max
every 15 minutes)
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Specifications
Function
DC Voltage
AC Voltage
50/60Hz
DC Current
AC Current
50/60Hz
Resistance
Range
400mV
4V
40V
400V
600V
400mV
4V
40V
400V
600V
Resolution
0.1mV
0.001V
0.01V
0.1V
1V
0.1mV
0.001V
0.01V
0.1V
1V
400µA
4000µA
40mA
400mA
10A
400µA
4000µA
40mA
400mA
10A
400Ω
4kΩ
40kΩ
400kΩ
4MΩ
40MΩ
0.1µA
1µA
0.01mA
0.1mA
0.01A
0.1µA
1µA
0.01mA
0.1mA
0.01A
0.1Ω
0.001kΩ
0.01kΩ
0.1kΩ
0.001MΩ
0.01MΩ
4
Accuracy
±(0.5% reading + 2 digits)
±(1.0% reading + 2 digits)
±(1.5% reading + 2 digits)
±(1.0% reading + 70 digits)
±(1.0% reading + 3 digits)
±(1.2% reading + 3 digits)
±(2.0% reading + 4 digits)
±(1.5% reading + 3 digits)
±(2.5% reading + 5 digits)
±(1.8% reading + 5 digits)
±(3.0% reading + 7 digits)
±(1.0% reading + 4 digits)
±(1.0% reading + 2 digits)
±(1.2% reading + 2 digits)
±(2.0% reading + 5 digits)
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Capacitance
Frequency
Function
Duty Cycle
Temp °F
Temp °C
4nF
0.001nF
±(5.0% reading + 10digits)
40nF
0.01nF
±(5.0% reading + 7 digits)
400nF
0.1nF
±(3.0% reading + 5 digits)
4µF
0.001µF
±(3.5% reading + 5 digits)
40µF
0.01µF
200µF
0.1µF
±(5.0% reading + 5 digits)
9.999Hz
0.001Hz
±(1.5% reading + 5 digits)
99.99Hz
0.01Hz
999.9Hz
0.1Hz
9.999kHz
0.001kHz
±(1.2% reading + 2 digits)
99.99kHz
0.01kHz
999.9kHz
0.1kHz
9.999MHz
0.001MHz
±(1.5% reading + 4 digits)
Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle
and <100kHz; 5Vrms min @ 20% to 80% duty cycle
and > 100kHz.
Range
Resolution Accuracy
0.1 to 99.9% 0.1%
±(1.2% reading + 2 digits)
Pulse width: 100µs - 100ms
Frequency: 5Hz to 150kHz
±(3.0% reading + 3 digits)
-4 to 1400°F 1°F
(meter only, probe accuracy
-20 to 760°C 1°C
not included)
o
o
o
o
NOTE: Accuracy is stated at 65 F to 83 F (18 C to 28 C) and less than
70% RH.
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Diode Test
Continuity Check
Temperature sensor
Input Impedance
AC Bandwidth
Display
Overrange indication
Polarity
Measurement Rate
Auto Power Off
Low Battery Indication
Battery
Fuses
Operating Temperature
Storage Temperature
Relative Humidity
Operating Altitude
Weight
Size
Safety
Test current of 0.3mA maximum, open
circuit voltage 1.5V DC typical
Audible signal will sound if the resistance is
less than approximately 30Ω, test current
<0.7mA
Requires type K thermocouple
7.5MΩ (VDC and VAC)
40 to 400Hz
4000 count backlit Liquid Crystal
“OL” is displayed
Automatic (no indication for positive
polarity); Minus (-) sign for negative polarity.
2 times per second, nominal
Meter automatically shuts down after 15
minutes of inactivity
“BAT” is displayed if battery voltage drops
below operating voltage
One 9V battery; NEDA 1604, IEC 6F22
mA, µA and Temperature ranges;
0.5A/250V fast blow
10A range, 10A/250V fast blow
o
o
o
o
32 F to 122 F (0 C to 50 C)
o
o
o
o
-4 F to 140 F (-20 C to 60 C)
<70% operating, <80% storage
7000ft (2000 meters) maximum.
7 oz. (200g).
6” x 3” x 1.75” (15.25x 7.6x 4.45cm)
For indoor use and in accordance with the
requirements for double insulation to
IEC1010-1 (1995); EN61010-1 (1995)
Overvoltage Category III.
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Meter Description
1.
Liquid Crystal Display
2.
Range button
3.
Hz/Duty Cycle button
4.
Mode button
5.
Rotary Function switch
1
6.
COM jack
2
3
4
7.
10A Current jack
5
8.
Hold button
9.
Relative button
6
7
10. Backlite button
8
9
10
11
11. Positive input jack
Note: Tilt stand, fuse and battery compartment are on rear of unit.
Symbols
AC
DC
•)))
mV, V
Ω, KΩ, MΩ
µA, mA, A
nF, uF
Hz kHz
%
O
O
F, C
AUTO
BAT
HOLD
REL
Alternating current or voltage
Direct current or voltage
Continuity
Diode test
millivolt, volt (voltage)
ohm, kilohm, megohm (resistance)
microamp, milliamp, Amp (current)
nanofarad, microfarad (capacitance)
hertz, kilohertz (frequency)
% duty cycle
Degrees Fahrenheit, Centigrade (temperature)
Autorange
Low battery
Display hold
Relative
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Operating Instructions
AC or DC Voltage Measurements
1. Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive V jack.
2. Turn the rotary switch to the VAC or VDC
position.
3. Touch the test probes to the circuit under test
and read the voltage on the display.
Note: Pressing the Hz/% button while in the voltaget
function will switch the display to frequency or duty cycle
V
AC or DC Current Measurements
CAUTION: Do not make current measurements on the 10A scale for
longer than 30 seconds every 15 minutes. 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
and the red test lead banana plug into the;
a. Positive uA/mA jack for currents to 400mA
b. Positive 10A jack for currents to 10A
2. Turn the rotary switch to the uA, mA or A position.
3. Press the MODE button to select AC or DC current
4. Touch the test probes in series with the circuit under test and read
the current on the display.
Note: Pressing the Hz/% button while in the current function will switch
the display to frequency or duty cycle
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Resistance Measurements
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any resistance
measurements.
1.
Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive Ω jack.
2.
Turn the rotary switch to the Ω position.
3.
Touch the test probes to the circuit or device
under test and read the resistance on the display.
Ω
Capacitance Measurements
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any capacitance
measurements.
1.
Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive CAP jack.
2.
Turn the rotary switch to the CAP position.
3.
Touch the test probes to the circuit or device
under test and read the capacitance on the
display.
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Frequency or Duty Cycle Measurements
1.
Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive HZ jack.
2.
Turn the rotary switch to the FREQ % position.
3.
Press the Hz/% button to select “Hz” or “%”.
4.
Touch the test probes to the circuit or under test
and read the frequency or duty cycle on the
display.
Hz
Continuity Measurements
1.
Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive Ω jack.
2.
Turn the rotary switch to the
3.
Press the MODE button until “•)))” appears in the display.
4.
Touch the test probes to the circuit or device under test. If the
resistance is less than approximately 30Ω the buzzer will sound
and the resistance appears on the display.
•))) position.
Note: The meter automatically holds the 400Ω range when continuity is
selected
Temperature Measurements
1.
Insert the type K thermocouple probe black test
lead banana plug into the negative COM jack and
the red test lead banana plug into the positive
Temp jack..
2.
Turn the rotary switch to the C or F position.
3.
Read the temperature on the display.
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Diode Measurements
1. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive diode jack.
2.
Turn the rotary switch to the
3.
Press the MODE button until “
4.
Touch the test probes to the diode under test. Forward voltage will
indicate 0.4V to 0.7V. Reverse voltage will indicate “OL”. Shorted
devices will indicate near 0mV and an open device will indicate
“OL” in both polarities.
Red
Probe
Black
Probe
Forward test
•))) position.
“ appears in the display.
Black
Probe
Red
Probe
Reverse test
Manual Ranging
The meter turns on in the autoranging mode. Press the Range button to
go to manual ranging. Each press of the range button will step to the
next range as indicated by the units and decimal point location. Press
and hold the Range button for two seconds to return to autoranging.
Manual ranging does not function in the Capacitance, Frequency and
Temperature functions
Data Hold
Press the Data Hold button to freeze the reading in the display. “HOLD”
will appear in the LCD. Press the button again to release the display.
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Relative Measurements
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 any measurement as described in the operating
instructions.
2. Press the Relative button to store the reading in the display and
the "REL" indicator will appear on the display.
3. The display will now indicate the difference between the stored
value and the measured value.
4. Press the Relative button to return to normal operation.
Backlight
The backlight function illuminates the display and is used when the
ambient light to too low to permit viewing of the displayed readings.
Press the
button for one second to turn the backlight on and press
the button a second time to turn the backlight off.
Auto Off
The auto off feature will turn the meter off after 15 minutes of inactivity
(Range switch or a button has not been turned or pressed). A beep will
warn the user shortly before the auto off feature activates. Turn the
Function switch to the OFF position and then to a function to resume
operation.
True RMS
The term stands for “Root-Mean-Square,” which represents the method
of calculation of the voltage or current value. Average responding
multimeters are calibrated to read correctly only on sine waves and they
will read inaccurately on non-sine wave or distorted signals. True rms
meters read accurately on either type of signal.
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Maintenance
WARNING: To avoid electric shock, disconnect the test leads from
any source of voltage before removing the battery/fuse cover.
WARNING: To avoid electric shock, do not operate your meter until
the battery/fuse cover is in place and fastened securely.
This Multimeter is designed to provide years of dependable service, if the
following care instructions are performed.
1.
2.
Keep the meter dry.
Use and store the meter in mild ambient conditions. Temperature
extremes can shorten the life of the electronic parts and distort or
melt plastic parts.
3. Handle the meter gently. 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 a fresh battery of the recommended size and type.
Remove the old or weak battery so it does not leak and damage
the unit.
6. If the meter is to be stored for a long period of time, the battery
should be removed to prevent damage to the unit.
Battery Replacement
1.
Disconnect the test leads from the meter.
2.
Remove the rubber holster/boot (if in place).
3.
Open the battery door by removing the screws
using a Phillips head screwdriver.
4.
Insert the new battery into the battery holder,
observing the correct polarity.
5.
Replace the battery door and secure with the
screws.
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Fuse Replacement
WARNING: To avoid electric shock, disconnect the test leads from
any source of voltage before removing battery/fuse cover.
1.
Disconnect the test leads from any circuit being measured.
2.
Remove the rubber holster (if in place).
3.
Open the battery/fuse cover by removing the screws on the rear
using a Phillips screwdriver.
4.
Remove the battery cover.
5.
Remove the old fuse by gently pulling up on it.
6.
Install the new fuse by gently pushing it into the holder.
7.
Always use a fuse of the proper size and value (0.5A/250V fast
blow or 10A/250V fast blow).
8.
Replace the cover and secure with the screws.
A UL mark does not indicate that this product has been evaluated for the
accuracy of its readings.
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Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of
defects in parts and workmanship for one year from date of shipment (a six month
limited warranty applies on sensors and cables). If it should become necessary to
return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’
to request an RA number). A Return Authorization (RA) number must be issued
before any product is returned to Extech. The sender is responsible for shipping
charges, freight, insurance and proper packaging to prevent damage in transit. This
warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or
merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential damages. Extech's total liability is limited to repair
or replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the
products we sell. For periodic calibration, NIST certification or repair of
any Extech product, call customer service for details on services
available. Extech recommends that calibration be performed on an
annual basis to ensure calibration integrity.
Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: support@extech.com
Repair/Returns: Ext. 210; Email: repair@extech.com
Website: www.extech.com
Copyright © 2002 Extech Instruments Corporation.
All rights reserved including the right of reproduction
in whole or in part in any form.
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