IDEAL INDUSTRIES, INC.
TECHNICAL MANUAL
MODEL: 61-340
MODEL: 61-342
Multimeter Service Information
The Service Information provides the following information:
• Precautions and safety information
• Specifications
• Basic maintenance (cleaning, replacing the battery and fuses)
• Performance test procedures
• Calibration and calibration adjustment procedures
Form Number: TM61340-2
Revision: 2. Date: November 2007
Form Number 2 TM61340-2 Rev November 2007
TABLE OF CONTENTS Page
Introduction 1
Precautions and Safety Information 1
Symbols 1
Safety 2
Specifications 3
General Specifications 3
Measurement Characteristics 4
Voltage Specifications 4
Current Specifications 4/5
Resistance, Diode, Continuity, Capacitance Specifications 6
Frequency, Temperature Specifications 7
Auto Power Off, Data Hold/Backlight, SELECT, RANGE, REL, Hz/DUTY, MAX/MIN 7/8
Physical and Environment Characteristics 9
Certifications and Compliances 9
Required Equipment 10
Basic Maintenance 11
Opening the Meter Case 11
Replacing the Battery 11
Replacing Fuses 12
Fuse Replacement 12
Cleaning 12
Performance Tests 13
Testing the Display 13
Testing the Voltage Function 14/15
Testing the DC Current Functions 15/16
Testing the AC Current Functions 16/17
Testing the Resistance Function 18
Testing the Capacitance, Diode, Continuity Functions 18/19
Testing the Frequency Function 20
Testing the DUTY CYCLE Function 20
Testing the Temperature Function 21
Calibration 22
Calibration Adjustment, DCV, ACV DCA and Temperature Functions 22/23
Form Number 2 TM61340-2 Rev November 2007
Page 1
Introduction
Warning
To avoid shock or injury, do not perform the verification tests or calibration procedures described in
the manual unless you are qualified to do so.
The information provided in this document is for the use of qualified personnel only.
Caution
The 61-340 serials contain parts that can be damaged by static discharge.
Follow the standard practices for handling static sensitive devices.
For additional information about IDEAL INDUSTRIES, INC. and its products, and services, visit IDEAL
INDUSTRIES, INC. web site at:
www.idealindustries.com
Precautions and Safety Information
Use the meter only as described in the Service Manual. If you do not do so, the protection provided by the
meter may be impaired. Read the “Safety Information” page before servicing this product.
In this manual, a Warning identifies conditions and actions that pose hazard (s) to the user; a Caution
identifies conditions and actions that may damage the meter or the test instruments.
The Symbols
The symbols used on the meter and in this manual are explained in Table A.
Table A. The Symbols
Risk of electric shock
See instruction card (Caution information)
DC measurement
Equipment protected by double or reinforced
insulation
Low Battery indicator
Earth
AC measurement
Conforms to EU directives
Form Number 2 TM61340-2 Rev November 2007
Page 2
SAFETY
Review the following safety precautions to avoid injury and prevent damage to this product or any
products connected to it. To avoid potential hazards, use the product only as specified.
For operating instructions, see the 61-340 / 61-342 Digital Multimeter Instruction Manual.
CAUTION: These statements identify conditions or practices that could result in damage to the
equipment or other property.
WARNING: These statements identify conditions or practices that could result in personal injury or
loss of life.
Use proper Fuse. To avoid fire hazard, use only the fuse type and rating specified for this product.
Do not operate without covers. To avoid personal injury, do not apply any voltage or current to the
product without covers in place.
Do Not Exceed the maximum rated input limits, as marked on the meter.
Electric overload. Never apply a voltage to a connector on the product that is outside the range
specified for that connector.
Avoid electric shock. To avoid injury or loss of life, do not connect or disconnect probes or test leads
while they are connected to a voltage source.
Do not operate in wet/damp conditions. To avoid electric shock, do not operate this product in wet or
damp conditions.
Use great care when you are required to make measurements on live circuits that exceed 50V.
Form Number 2 TM61340-2 Rev November 2007
SPECIFICATIONS
All specifications are warranted unless noted typical and apply to the 61-340 & 61-342
Stated accuracies are at 23°C±5°C at less than 75% relative humidity and without the battery indicator
displayed.
General specifications
Characteristics Description
Display count 3 3/4 digit liquid crystal display, max count 4000
Numeric update rate 2.5 times / sec
Polarity display Automatic
Over range display “OL” is displayed
Low battery indicator is indicated
Automatic power-off time Automatic power off ≈ 10minutes
Page 3
Power source
*Maximum input voltage 1000Vrms CAT III between V and COM
*Maximum floating voltage
Maximum input current 400mA between µA /mA and COM
Overload protection mA connector 500mA (250V) fast blow fuse.
Overload protection 10A connector 10A (250V) fast blow fuse.
V connector V , V , Ω, , , , Hz
µA /mA connector µA, mA, Temp
Temperature Coefficient 0.1×(Spec. Accuracy) per °C, <18°C or >28°C
Battery Life
9.0V battery: types- NEDA 1604, JIS006P, IEC6F22
for both 61-340 and 61-342
1000Vrms CAT III between any terminal and earth ground
Alkaline 9V, ≈ 200 hours for 61-340
Alkaline 9V, ≈ 150 hours for 61-342
Form Number 2 TM61340-2 Rev November 2007
Page 4
Measurement Characteristics
Accuracy is ±(% reading + number of digits) at 23°C ± 5°C, less than 75% R.H.
(1) DC Volts(for 61-340 / 61-342)
Range Resolution Accuracy
Over voltage
protection
400.0mV 0.1mV ±(0.8% reading + 3 digits)
4.000V 1mV
40.00V 10mV
±(0.8% reading + 1 digits)
1000VDC or 750VAC
400.0V 100mV
1000V 1V ±(1.0% reading + 3 digits)
Input Impedance: 10MΩ
(2) AC Volts (61-340/61-342)
Range Resolution Accuracy
400.0mV 0.1mV
±(1.2%+8)
Over voltage
protection
4.000V 1mV
40.00V 10mV
1.0% + 5
1000VDC or 750VAC
400.0V 100mV
750V
1V
±(1.2%+5)
Input Impedance: 10MΩ
AC Conversion Type: 61-340: Average sensing rms indication calibrated to the sine wave input.
61-342: AC conversion is True RMS responding, calibrated to a sinusoidal
waveform
Crest Factor: C.F. = Peak/RMS
For non-sinusoidal waveform, C.F. > 2 add ±1% to accuracy,
Frequency response: 40～400Hz
(3a) DC micro-amp and milli-amps (for 61-340 / 61-342)
Range Resolution Accuracy Input Protection
400.0µA 0.1μA
±(0.8% reading + 2 digits)*
4000µA 1μA
40.00mA 10μA
±(0.8% reading + 3 digits)*
400.0mA 0.1mA
Overload Protection: mA Input: 500mA, 250V Fast Blow fuse. (61-340 / 61-342)
Form Number 2 TM61340-2 Rev November 2007
500mA, 250V Fast
Blow Fuse
(3b) DC Current (61-340 / 61-342)
Range Resolution Accuracy Input Protection
Page 5
4.000A 0.001A
±(1.5% reading + 5 digits)
10.00A* 0.01A
10A, 250V Fast Blow
Fuse
Overload Protection: A Input: 10A, 250V Fast Blow fuse. (61-340 / 61-342)
*Caution
followed by a 15 minute cool down period. Exceeding 15 seconds may cause da mage to the meter and/or the test
leads.
: Do not make high current measurements on the 10A scale for longer that 15 seconds. This should be
(4a) AC micro-amp and milli-amps Current (61-340 / 61-342)
Range Resolution Accuracy Input Protection
1
400.0µA 0.1μA
±(1.5% reading + 5 digits) *
4000µA 1μA
40.00mA 10μA
±(2.0% reading + 5 digits) *
400.0mA 0.1mA
40Hz
40Hz
~ 400Hz
~ 400Hz
500mA, 250V Fast
1
Blow Fuse
Overload Protection: μA / mA Input: 500mA,250V Fast Blow fuse. (61-340 / 61-342)
(4b) AC Current (61-340 / 61-342)
Range Resolution Accuracy Input Protection
4.000A 0.001mA
±(2.5% reading + 5 digits) *
10.00A* 0.01mA
40Hz
~ 400Hz
1
10A, 250V Fast Blow
Fuse.
Overload Protection: A Input: 10A (250V) fast blow fuse.
AC Conversion Type: AC conversions are True RMS responding, calibrated to the sine wave input.
1
*
The specified accuracy is for sine wave at full scale and non-sine wave at half scale with crest factor
up to 2.
*Caution:
followed by a 15 minute cool down period. Exceeding 15 seconds may cause da mage to the meter and/or the test
leads.
Do not make high current measurements on the 10A scale for longer that 15 seconds. This should be
Form Number 2 TM61340-2 Rev November 2007
Page 6
(5) Resistance (for 61-340 / 61-342)
Range Resolution Accuracy
400.0Ω *1 0.1Ω ±(1.2% reading + 5 digits)
4.000KΩ 1Ω
40.00KΩ 10Ω
400.0KΩ 100Ω
4.000MΩ 1KΩ ±(1.2% reading + 2 digits)
40.00MΩ *2 10KΩ ±(2.0% reading + 5 digits)
Open circuit Voltage: 0.44V approx.
1
*
< 5 digit of reading rolling.
2
*
< 2% of reading rolling.
(6) Diode Check and Continuity (for 61-340 / 61-342)
Over voltage
protection
±(1.0% reading + 2 digits)
600Vrms
Range Resolution Accuracy
Max. Test
Current
Max. Open
Circuit Voltage
1mV Not specified * <1mA, approx. 2.5V, approx.
Overload Protection: Not specified
Continuity: Built-in buzzer sounds when resistance is less than approximately 120 Ω with a response
time of approximately 100 msec.
(7) Capacitance (for 61-340 / 61-342)
Range Resolution Accuracy
40.00nF 10pF
REL：±(3% reading + 10 digits)
Over voltage
Protection
400.0nF 100pF
4.000μF 1nF
±(3% reading + 5 digits)
40.00μF 10nF
400.0μF 100nF
±(20% reading + 5 digits) *
2
4000μF *1 10μF
*1 In this range the reading maybe rolling within specification.
2
*
Specify reading < half full scale of range.
Note: The meter selects the proper range automatically. Each measurement takes about one
second per range, Readings >40.00μF will take ≈ 8 seconds or greater
Form Number 2 TM61340-2 Rev November 2007
(8) Frequency (for 61-340 / 61-342)
Page 7
Range Resolution Sensitivity Accuracy
10.00Hz 0.01Hz
100.0Hz 0.1Hz
1.000KHz 1Hz
10.00KHz 10Hz
0.7V rms *
Frequency:
(± 0.1% + 3 digit)
100.0KHz 100Hz
1.000MHz 10KHz
4.000MHz 10KHz 3.0V rms
(9) Temperature: Type K thermocouple (for 61-340 / 61-342)
Range Resolution Accuracy
1
-50 to 750 ºC
-58 to1382 ºF
ºC ±3.0% ± 3 ºC
1
ºF ±3.0% ± 5 ºF
protection
Not Specified
(10) Auto Power Off (APO)
If the meter idles for more than ≈ 10 minutes, the meter automatically turns the power off.
(11) Data Hold/Backlight
Overload
protection
600V rms
Overload
Press this button less than 2 seconds the meter enter data hold mode and “ HOLD ” symbol appear
on LCD, and the momentary value while pressing the button display on LCD. Press it again to exit this mode
and “ HOLD ” symbol disappear on display. As data hold function, this button do not effect on diode
and continuity test function. The secondary function of this button is backlight enable and disable. If you
press it more than 2 seconds, the backlight will be turn on and press it more than 2 seconds again will make
the backlight off.
(12) SELECT
There are several functions at one rotary switch position, press SELECT button to select
function you want, It allowable to select AC or DC voltage, AC or DC current, Resistance ,Diode , Audible
continuity or capacitance, ℃ or ℉ temperature measurement.
(13) RANGE
When power on, meter at auto range mode, press RANGE button you can select measurement range
you want. Range is run up with times of pressing RANGE button until its max, then return the min range.
Press RANGE button more than 2 seconds , the meter return to auto range. This button do not effect on
frequency, duty cycle, capacitance, diode & continuity test and temperature measurement.
Form Number 2 TM61340-2 Rev November 2007
Page 8
(14) REL
Press this button the meter enter relative measuring state and “Δ” symbol appear on LCD.
The result of the relative measurement is the difference between measuring value and
reference value. The reference value is produced same as momentary reading value when
pressing this button, press it again to exit this state and “Δ” symbol disappear on display, and
this button do not effect on frequency, diode and continuity test function. Press this button less
than 2 seconds the meter enter relative measuring state and “Δ” symbol appear on LCD.
(15) Hz/DUTY
When you make frequency, AC voltage or AC current measurement, press this button to switch Hz or
duty cycle test mode.
(16) MAX/MIN
Press MAX/MIN button the meter enter Maximum value / Minimum value record mode and “ MAX ” / ”
MIN ” symbol appear on LCD, the LCD will display the maximum value or minimum value science pressing
the button always. Press MAX/MIN more than 2 seconds button again to exit this mode and “ MAX ” / ” MIN ”
symbol disappear on display. This button do not effect on diode and continuity test function, capacitance
measurement, frequency measurement.
Form Number 2 TM61340-2 Rev November 2007
Physical and Environmental Characteristics
Characteristics Description
Page 9
Dimensions (H×W×D)
Weight (with battery& holster) 0.379Kg (13.4 oz.)
Environmental characteristics Description
Temperature operating 0 to +40°C
Non-Operating -20 to +60°C <75% R.H.
Humidity (operating) <70% R.H.
Altitude 6561.7 Ft. (2000m)
Indoor Use Indoor Use
Certifications and compliances
Safety
Input Safety Rating
Complies with UL 61010B-1
V / Ω: , UL 61010B-1, UL 61010-B-2-031, EU 61010-1
EN61010-2-031, Cat IV 600Volts, Cat III 1000V
180mm(H) ×91mm (W) ×43mm(D) (with holster)
7.1” (H) x 3.6”(W) x1.7”(D)
CAT IV: Service drop to service entrance,
CAT III: Distribution level mains, fixed installation.
CAT II: Local level mains, appliances, portable equipment
CAT I: Signal level, special equipment or parts of equipment,
telecommunication, electronics.
Pollution Degree 2
EC Declaration
of Conformity
Do not operate in environments where conductive
Pollutants may be present.
Meets the intent of Directive 89/336/EEC for Electromagnetic
Compatibility and Low Voltage Directive 73/23/EEC for product
safety. Compliance was demonstrated to the following specifica-
tions as listed in the official Journal of the European Communities:
En 55011 Class A: Radiated and Conducted
Emissions.
En 50082-1 Immunity: IEC 801-2 Electrostatic Discharge
IEC 801-3 RF Radiated
En 61010-1 Safety requirements for electrical equipment for
measurement, control, and laboratory use.
Form Number 2 TM61340-2 Rev November 2007
Page 10
Required Equipment
Required equipment is listed in Table B. If the recommended models are not available, equipment with
equivalent specifications may be used.
Repairs or servicing should be performed only by qualified personnel.
Table B. Required Equipment
Equipment Required Characteristics Recommended Model
Calibrator
AC Voltage Range: 0
Accuracy: ±0.07% (Basic)
Frequency Range: 40
Accuracy: ±2%
DC Voltage Range: 0
Accuracy: ±0.006% (Basic)
Current Range: 0
Accuracy: AC (40Hz to 1KHz): ±0.08% (Basic)
DC: ±0.02% (Basic)
Frequency Source: 1.00Hz
Accuracy: ±0.001%
Amplitude: 0.5V p-p
Accuracy: ±5%
Resistance Range: 1Ω
Accuracy: ±0.03% (Basic)
Capacitance Range: 1pF
Accuracy: ±0.10% (Basic)
~ 750V AC
~ 1KHz
~ 1000V DC
~ 10A
~ 10MHz
~ 5.0V p-p (square wave)
~ 100MΩ
~ 10mF
Fluke 5500 or Wavetek
9100 Calibrator or
equipment
Form Number 2 TM61340-2 Rev November 2007
Basic Maintenance
Warning
To avoid shock, remove the test leads and any input signals before opening the case or replacing the
battery or fuses.
Opening the Meter Case
Caution
To avoid unintentional shock circuit, always place the uncovered meter assembly on a protective surface.
When the case of the meter is open, circuit connections are exposed.
1. Disconnect test leads from any live source, turn the rotary switch to OFF, and remove the test leads
from front terminals.
2. For battery replacement, follow instructions under Replacing the Battery section
3. For fuse replacement, follow instructions under Fuse Replacement section.
Replacing the Battery
The 61-340/61-342 meter are both powered by 9V, types are, NEDA 1604, JIS006P, IEC 6F22
1. Remove the rubber holster
2. Remove the screw on the battery cover and open the battery cover
3. Remove the old battery and install the new battery
4. Return the battery cover and reinstall the battery cover screw.
5. Replace the rubber boot.
Battery and Fuse Replacement
Page 11
Form Number 2 TM61340-2 Rev November 2007
Figure 1
Page 12
Replacing Fuses
Warning
To avoid electrical shock, remove the test leads and any input signals before replacing the battery
or fuses. To prevent damage or injury, INSTALL ONLY quick acting fuses with the following
Volt/Amp current interrupt rating:
F340: 500mA, 250V Fast Blow Fuse
F342: 10A, 250V Fast Blow Fuse
Fuse Replacement
The 61-340 and 61-342 are fused in both the μA /mA input and 10 amperes input ports.
μA /mA input port is fused by a F340: 500mA, 250V FAST BLOW fuse, 10 A input port is fused by
F342: 10A, 250V FAST BLOW fuse
1. Remove the rubber holster
2. Remove the screw on the battery cover and open the battery cover.
3. Remove the two screws at the bottom of back cover and a screw under the support stand.
4. Take out the old battery, and remove the back case cover.
5. * Replace the defective fuse with the standard rated fuse for this meter
6. Return the back case cover, reinsert the case screws.
a. It is recommended you replace the old battery with new battery.
7. Return the battery cover and reinstall the battery cover screw.
8. Replace the rubber boot.
Use only a fuse with the amperage, interrupt voltage, and speed rating specified.
Cleaning
Warning
To avoid electrical shock or damage to the meter, never allow water inside the case. To avoid
damaging the meter’s housing, never apply solvents to the meter.
Form Number 2 TM61340-2 Rev November 2007
Performance Tests
The following performance tests verify the complete operability of the meter and check the accuracy of
each meter function against the meter’s specifications.
For operating instructions, see the 61-340 / 61-342 Digital Multimeter Instruction Manual.
Accuracy specifications are valid for a period of one year after calibration, when measured at an
operating temperature of 18°C to 28°C and a maximum of 75% relative humidity.
To perform the following tests, it is not necessary to open the case, no adjustments are
necessary, merely make the required connections, apply the designated inputs, and
determine if the reading on the meter display falls within the acceptable range indicated.
If the meter fails any of these tests, it needs calibration adjustment or repair.
Testing the Display
Turning the meter on from the “OFF” position, the meter will full display all segment and symbols.
Compare the display with the example in Figure 2.
LCD Graphics 61-340 / 61-342
Page 13
Figure 2 Display Test
Form Number 2 TM61340-2 Rev November 2007
Page 14
Testing the Voltage Function (for 61-340 / 61-342)
To verify accuracy in the AC and DC voltage ranges, do the following:
1. Turn the rotary switch to “
2. Connect the calibrator to the
” position.
and COM inputs on the meter.
3. Set the calibrator for the voltage from step 1 to 7 in Table 1.
4. Compare the reading on the meter display with the display reading shown in Table 1.
5. If the display reading falls outside of the range shown in Table 1, the meter does not meet
specification.
Table 1 DC Voltage Test:
Step
1
2
3
4
5
6
7
Range
400mV
400mV
400mV
4V
40V
400V
1000V
Input Reading
-300.0mV -297.3 to -302.7
4.0mV 3.6 to 4.4
300.0mV 297.3 to 302.7
3.000V 2.975 to 3.025
30.00V
300.0V
1000V
29.75 to 30.25
297.5 to 302.5
987 to 1013
1. Turn the rotary switch to position. “
”
2. Set the calibration for the voltage and frequency from step 1 to 10 in Table 2.
3. Compare the reading on the meter display with the display reading shown in Table 2.
4. If the display reading falls outside of the range shown in Table 2, the meter does not meet
specification.
Form Number 2 TM61340-2 Rev November 2007
Table 2 AC Voltage Test:
Step Range Input Frequency Reading 61-340 Reading 61-342
1 400mV 300mV 60 295.6 to304.4 295.6 to304.4
2 400mV 300mV 400 295.6 to304.4 295.6 to304.4
Page 15
3
4
5
6
7
8
9
10
4V
4V
40V
40V
400V
400V
750V
750V
3.000V 60Hz 2.965 to 3.035 2.965 to 3.035
3.000V 400Hz 2.965 to 3.035 2.965 to 3.035
30.00V 60Hz 29.65 to 30.35 29.65 to 30.35
30.00V 400Hz 29.65 to 30.35 29.65 to 30.35
300.0V 60Hz 296.5 to 303.5 296.5 to 303.5
300.0V 400Hz 296.5 to 303.5 296.5 to 303.5
750V 60Hz 736 to 764 736 to 764
750V 400Hz 736 to 764 736 to 764
Testing the DC microamperes Function (for 61-340 and 61-342)
To verify the accuracy of AC and DC current measurement functions, do the following:
1. Connect the calibrator to the
2. Turn the rotary switch to
and COM inputs on the meter.
a. Press the SELECT button to select the DC function
3. Apply the inputs for steps 1-3 in Table 3a.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 3a
5. If the display reading falls outside of the range shown in Table 3a, the meter does not meet
specification.
Table 3a DC microamperes Test:
Step
1
2
3
Range
400µA
400µA
4000µA
Source Reading
4.0µA 3.5 to 4.5
300.0µA 297.4 to 302.6
3000µA 2974 to 3026
Testing the DC milli amperes Function (for 61-340 and 61-342)
1. Connect the calibrator to the
2. Turn the rotary switch to
.
and COM inputs on the meter.
a. Press the SEL button to select the DC function
3. Apply the inputs for steps 1-4 in Table 3b.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 3b
5. If the display reading falls outside of the range shown in Table 3b, the meter does not meet
specification.
Form Number 2 TM61340-2 Rev November 2007
Page 16
Table 3b DC mA Test:
Step
1
2
Range
40mA
400mA
Source Reading
30.00mA 29.73 to 30.27
300.0mA 297.3 to 302.7
Testing the DC ampere Function (for 61-340 and 61-342)
1. Connect the calibrator to the 10A and COM inputs on the meter.
2. Turn the rotary switch to
.
a. Press the SELECT button to select the DC function
3. Apply the inputs for steps 1-2 in Table 3c.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 3c
5. If the display reading falls outside of the range shown in Table 3c, the meter does not meet
specification.
Table 3c DCA Test:
Step
1
2
Range
4
10
Source Reading
3.000A 2.950 to 3.050
10.00A 9.80 to 10.20
Testing the AC microampere Function (for 61-340 and 61-342)
To verify the accuracy of AC and DC current measurement functions, do the following:
1. Connect the calibrator to the
2. Turn the rotary switch to
and COM inputs on the meter.
a. Press the SELECT button to select the AC function
b. Press the REL button to make the display is zero
3. Apply the inputs for steps 1-6 in Table 4a.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 4a
5. If the display reading falls outside of the range shown in Table 4a, the meter does not meet
specification.
Table 4a AC microampere Test:
Step
1
2
3
4
Range
400µA
400µA
400µA
400µA
Source
40µA
40µA
300.0µA
300.0µA
Frequency
60
400
400
400
Reading
38.9 to 41.1
38.9 to 41.1
295.0 to 305.0
295.0 to 305.0
5
6
4000µA
4000µA
3000µA
3000µA
Form Number 2 TM61340-2 Rev November 2007
60
400
2950 to 3050
2950 to 3050
Testing the AC milliampere function: (for 61-340and 61-342)
Page 17
1. Connect the calibrator to the
2. Turn the rotary switch to
.
and COM inputs on the meter.
a. Press the SELECT button to select the AC function
b. Press the REL button to make the display is zero
3. Apply the inputs for steps 1-4 in Table 4b.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 4b
5. If the display reading falls outside of the range shown in Table 4b, the meter does not meet
specification.
Table 4b ACmA Test:
Step
1
2
3
4
Range
40 mA
40 mA
400 mA
400 mA
Source Frequency Reading
30.00mA 60Hz 29.35 to 30.65
30.00mA 400Hz 29.35 to 30.65
300.0mA 60Hz 293.5 to 306.5
300.0mA 400Hz 293.5 to 306.5
Testing the AC A function (for 61-340 / 61-342)
1. Connect the calibrator to the 10A and COM inputs on the meter.
2. Turn the rotary switch to
.
a. Press the SELECT button to select the AC function
b. Press the REL button to make the display is zero
3. Apply the inputs for steps 1-4 in Table 4c.
4. For each input, compare the reading on the meter display to the reading for your meter in Table 4c
5. If the display reading falls outside of the range shown in Table 4c, the meter does not meet
specification.
Table 4c AC A Test:
Step
1
2
3
4
4A
4A
10A
10A
Source Frequency Reading
3.000A 60Hz 2.920 to 3.080
3.000A 400Hz 2.920 to 3.080
10A 60Hz 9.70 to 10.30
10A 400Hz 9.70 to 10.30
Form Number 2 TM61340-2 Rev November 2007
Page 18
Testing the Resistance Function (for 61-340 / 61-342)
To verify the accuracy of the resistance function, do the following:
1. Connect the calibrator to
2. Turn the rotary switch to
and COM on the meter.
.
a. Press the SELECT button to select the Ω function
3. Apply the inputs for step 1-7 in Table 5.
4. Compare the meter display readings to the display readings in Table 5.
5. If the display reading falls outside of the range shown in Table 5, the meter does not meet
specification.
Table 5 Ω Resistance Test:
Step
1
2
3
4
5
6
Range
400Ω*
400Ω*
4kΩ
40kΩ
400kΩ
4MΩ
Source Reading
4.0Ω 3.5 to 4.5
300.0Ω 295.9 to 304.1
3.000KΩ 2.968 to 3.032
30.00KΩ 29.68 to 30.32
300.0KΩ 296.8 to 303.2
3.000MΩ 2.968 to 3.032
7
40MΩ
30.00MΩ 29.35 to 30.65
*Lead resistance on the 400Ω range is not included in error.
Testing the Capacitance Function (for 61-340 / 61-342)
The meter measures capacitance by charging the capacitor with a known direct current, measuring the
resultant voltage, and calculating the capacitance. If the same capacitance is measured on an
impedance bridge, a different reading may result. This variance is likely to be greater at higher
frequencies.
To verify the accuracy of the capacitance measuring function, do the Following:
1. Apply the capacitor to the
2. Turn the rotary switch to
a. Press the SELECT button to select the
and COM inputs on the meter. For steps 1 through 7 in Table 6.
.
function
b. Press the REL button to make the display is zero
3. Compare the reading on the meter display to the reading in Table 6.
4. Note : The meter selects the proper range automatically. Each measurement takes about one
second per range, readings >40.00μF will take ≥ 5 to 30 seconds
5. If the display reading falls outside of the range shown in Table 6, the meter does not meet
specification.
Form Number 2
TM61340-2 Rev November 2007
Table 6 Capacitance Test:
Page 19
Step
1
2
3
Range
40nF
40nF
400nF
Source Reading
10.000nF 9.60 to 10.40
30.00nF 29.00 to 31.00
300.0nF 290.5 to 309.5
4 4µF 3.000µF 2.905 to 3.095
5 40.00µF 30.00µF 29.05 to 30.95
6 100.0µF 100.0µF 79.5 to 120.5
7 1000µF 1000µF 795 to 1205
Checking the Diode Test Function (for 61-340 / 61-342)
To check the diode test function, do the following:
1. Connect the DVM (Digital Voltage Meter) to the
2. Turn the meter’s rotary switch to
.
Press the SELECT button to select the function
The DVM display should display OL
3. Insert a Si diode with correct polarity “+” and “-“
The meter display should read within 0.5~0.7Vdc
4. Reverse polarity on the Si diode
The meter display should read OL
.
Checking the Continuity Function (for 61-340 / 61-342)
To check the diode test function, do the following:
and COM inputs on the meter.
1. Connect the DVM (Digital Voltage Meter) to the
2. Turn the meter’s rotary switch to
.
a) Press the SELECT button to select the
and COM inputs on the meter.
function
b) The DVM display should display OL
3. Insert a 50Ω resistor
a) The meter inner beeper will sound
Form Number 2 TM61340-2 Rev November 2007
Page 20
Testing the Frequency Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s frequency function, do the following:
1. Connect the calibrator to the
and COM inputs on the meter.
2. Note: The accuracy of the calibrator’s frequency function must be appropriate for the specified
accuracy of the meter.
3. Set the rotary switch to
.
4. Set the calibrator or function generator for the square wave voltage and frequency for steps 1-6 of
Table 7a.
5. Compare the reading on the meter display with the display reading shown in Table 7a.
6. If the display reading falls outside of the range shown in Table 7a, the meter does not meet
specification.
Table 7a Frequency Test:
Step
1
2
3
4
5
Range
100Hz
100Hz
1kHz
10kHz
100kHz
Source Level Reading
9.0Hz 3V rms 8.987 to 9.013
90Hz
900Hz
9kHz
90kHz
3V rms
3V rms
3V rms
3V rms
89.87 to 90.13
898.7 to 901.3
8.987 to 9.013
89.87 to 90.13
6
1MHz
900kHZ
3V rms
898.7to 901.3
Testing the Duty Cycle Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s frequency function, do the following:
1. Connect the calibrator to the
and COM inputs on the meter.
2. Note: The accuracy of the calibrator’s frequency function must be appropriate for the specified
accuracy of the meter.
3. Set the rotary switch to
.
a. Press the Hz/DUTY button to select the DUTY CYCLE function
4. Set the calibrator or function generator for the square wave voltage and frequency as Table 7b.
5. Compare the reading on the meter display with the display reading shown in Table 7b.
6. If the display reading falls outside of the range shown in Table 7b, the meter does not meet
specification.
Table 7b Duty Cycle Test:
Step
1
Range
1kHz
Source Level Reading
1kHz
3V rms
48.3% to 51.7%
Form Number 2 TM61340-2 Rev November 2007
Testing the Temperature Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s temperature function, do the following:
Page 21
1. Connect the calibrator to the
2. Set the rotary switch to the
3. Set the calibrators temperature output to the source values in Table 8, for steps 1-7.
4. Compare the reading on the meter display with the display reading shown in Table 8.
5. If the display reading falls outside of the range shown in Table 8, the meter does not meet
specification.
Table 8 Temperature Test:
Step
1
2
3
4
5
6
7
Range
ºF / ºC as instructed in Table 8.
ºC
ºC
ºC
ºC
ºF
ºF
ºF
and COM inputs on the meter.
Source Reading
ºC -3 to 3
0
ºC -23 to –17
-20
ºC 288 to 312
300
ºC 725 to 775
750
ºF -9 to 1
-4
ºF 27 to 37
32
ºF 1338 to 1426
1382
Form Number 2 TM61340-2 Rev November 2007
Page 22
Calibration Procedure
Recalibrate your meter:
It is recommended that the multimeter be calibrated once each year.
1. Perform calibration at an ambient temperature of 23°C±2°C and a relative humidity of <70%
Disconnect the test leads and turn the meter off. Remove the test leads from the front terminals.
2. Position the meter face down. Remove the battery cover screw and the 2 bottom case cover screws.
3. Lift the end of the bottom case cover until it gently unsnaps from the case top at the end nearest the
LCD.
(A) DC V Calibration (Adjust VR1)
1. Set the rotary switch to position “
2. Set the output of DC calibrator for 300.0mV and connect to
” for the DC Volts function.
and COM input terminals on
meter.
3. Using a small flat-tipped screwdriver, adjust VR1 until the display reads 299.5 to 300.5mV
4. Disconnect the DC calibrator from the meter.
(B) AC V Calibration (Adjust VR2)
Model 61-340:
1. Set the rotary switch to position. “
2. Set the output of the calibrator for 3.000V at 60Hz and connect to
” for the AC Volts function.
and COM input
terminals on meter.
3. Using a small flat-tipped screwdriver, adjust VR2 until the display reads 2.995 to 3.005Volts
4. Disconnect the AC calibrator from the meter.
Model 61-342:
1. Set the rotary switch to position. “
” and press SELECT button to select AC A function,
then press RANGE button to select 10A range .
2. Using a small flat-tipped screwdriver, adjust VR4 until the display reads 0 to 3 digits.
3. Press RANGE button to select 4A range and adjust VR5 until the display reads same as the
digits at AC 10A range ( 0 to 3 digits)
4. Set the rotary switch to position. “
5. Set the output of the calibrator for 3.000V at 60Hz. and connect to
” for the AC Volts Function.
and COM input
terminals on meter.
Form Number 2 TM61340-2 Rev November 2007
6. Using a small flat-tipped screwdriver, adjust VRtr until the display reads 2.995 to 3.005Volts
7. Disconnect the AC calibrator from the meter.
(C) TEMP Calibration (Adjust VR3)
1. Set the rotary switch to the "
ºF/ ºC " position.
2. Set the output of the calibrator to 300 ºC
Page 23
3. Connect the calibrator temperature output to the
and COM input terminals
4. Using a small flat-tipped screwdriver to adjust VR3 for a 300 ºC +/- 1 ºC (299 to 301) display
Form Number 2 TM61340-2 Rev November 2007
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