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 TM61340-2
Rev 2 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:
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 TM61340-2
Rev 2 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 TM61340-2
Rev 2 November 2007
Page 3
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
2.5 times / sec
Numeric update rate
Polarity display
Automatic
Over range display
Low battery indicator
Automatic power-off time
“OL” is displayed
is indicated
Automatic power off ≈ 10minutes
9.0V battery: types- NEDA 1604, JIS006P, IEC6F22
for both 61-340 and 61-342
Power source
*Maximum input voltage
*Maximum floating voltage
Maximum input current
Overload protection mA connector
Overload protection 10A connector
V connector
1000Vrms CAT III between V and COM
1000Vrms CAT III between any terminal and earth ground
400mA between µA /mA and COM
500mA (250V) fast blow fuse.
10A (250V) fast blow fuse.
V
, V , Ω,
,
,
, Hz
µA /mA connector
µA, mA, Temp
Temperature Coefficient
Battery Life
0.1×(Spec. Accuracy) per °C, <18°C or >28°C
Alkaline 9V, ≈ 200 hours for 61-340
Alkaline 9V, ≈ 150 hours for 61-342
Form Number TM61340-2
Rev 2 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)
Over voltage
protection
Range
Resolution
Accuracy
400.0mV
4.000V
40.00V
400.0V
1000V
0.1mV
1mV
±(0.8% reading + 3 digits)
±(0.8% reading + 1 digits)
±(1.0% reading + 3 digits)
1000VDC or 750VAC
10mV
100mV
1V
Input Impedance: 10MΩ
(2) AC Volts (61-340/61-342)
Over voltage
protection
Range
Resolution
Accuracy
±(1.2%+8)
400.0mV
4.000V
40.00V
400.0V
750V
0.1mV
1mV
1000VDC or 750VAC
10mV
100mV
1V
1.0% + 5
±(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
400.0µA
4000µA
40.00mA
400.0mA
Resolution
0.1μA
Accuracy
Input Protection
±(0.8% reading + 2 digits)*
1μA
500mA, 250V Fast
Blow Fuse
10μA
±(0.8% reading + 3 digits)*
0.1mA
Overload Protection: mA Input: 500mA, 250V Fast Blow fuse. (61-340 / 61-342)
Form Number TM61340-2
Rev 2 November 2007
Page 5
(3b) DC Current (61-340 / 61-342)
Range
4.000A
10.00A*
Resolution
Accuracy
Input Protection
0.001A
0.01A
10A, 250V Fast Blow
Fuse
±(1.5% reading + 5 digits)
Overload Protection: A Input: 10A, 250V Fast Blow fuse. (61-340 / 61-342)
*Caution: Do not make high current measurements on the 10A scale for longer that 15 seconds. This should be
followed by a 15 minute cool down period. Exceeding 15 seconds may cause damage to the meter and/or the test
leads.
(4a) AC micro-amp and milli-amps Current (61-340 / 61-342)
Range
400.0µA
4000µA
40.00mA
400.0mA
Resolution
0.1μA
Accuracy
±(1.5% reading + 5 digits) *1
Input Protection
40Hz ~ 400Hz
±(2.0% reading + 5 digits) *1
1μA
500mA, 250V Fast
Blow Fuse
10μA
40Hz ~ 400Hz
0.1mA
Overload Protection: μA / mA Input: 500mA,250V Fast Blow fuse. (61-340 / 61-342)
(4b) AC Current (61-340 / 61-342)
Range
4.000A
10.00A*
Resolution
0.001mA
0.01mA
Accuracy
±(2.5% reading + 5 digits) *1
Input Protection
10A, 250V Fast Blow
Fuse.
40Hz ~ 400Hz
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: Do not make high current measurements on the 10A scale for longer that 15 seconds. This should be
followed by a 15 minute cool down period. Exceeding 15 seconds may cause damage to the meter and/or the test
leads.
Form Number TM61340-2
Rev 2 November 2007
Page 6
(5) Resistance (for 61-340 / 61-342)
Over voltage
protection
Range
Resolution
Accuracy
400.0Ω *1
4.000KΩ
40.00KΩ
400.0KΩ
4.000MΩ
40.00MΩ *2
0.1Ω
1Ω
±(1.2% reading + 5 digits)
±(1.0% reading + 2 digits)
10Ω
600Vrms
100Ω
1KΩ
10KΩ
±(1.2% reading + 2 digits)
±(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)
Max. Test
Current
Max. Open
Range
Resolution
Accuracy
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)
Over voltage
Protection
Range
Resolution
Accuracy
REL：±(3% reading + 10 digits)
40.00nF
400.0nF
4.000μF
40.00μF
400.0μF
4000μF *1
10pF
100pF
1nF
±(3% reading + 5 digits)
10nF
100nF
10μF
±(20% reading + 5 digits) *2
*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 TM61340-2
Rev 2 November 2007
Page 7
(8) Frequency (for 61-340 / 61-342)
Overload
Range
Resolution
Sensitivity
Accuracy
protection
10.00Hz
100.0Hz
0.01Hz
0.1Hz
1Hz
1.000KHz
10.00KHz
100.0KHz
1.000MHz
4.000MHz
0.7V rms *
Frequency:
600V rms
10Hz
(± 0.1% + 3 digit)
100Hz
10KHz
10KHz
3.0V rms
(9) Temperature: Type K thermocouple (for 61-340 / 61-342)
Overload
Range
Resolution
Accuracy
protection
1ºC
1ºF
±3.0% ± 3 ºC
±3.0% ± 5 ºF
-50 to 750 ºC
-58 to1382 ºF
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
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 TM61340-2
Rev 2 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 TM61340-2
Rev 2 November 2007
Page 9
Physical and Environmental Characteristics
Characteristics
Description
180mm(H) ×91mm (W) ×43mm(D) (with holster)
7.1” (H) x 3.6”(W) x1.7”(D)
Dimensions (H×W×D)
Weight (with battery& holster)
Environmental characteristics
Temperature operating
Non-Operating
0.379Kg (13.4 oz.)
Description
0 to +40°C
-20 to +60°C <75% R.H.
<70% R.H.
Humidity (operating)
Altitude
6561.7 Ft. (2000m)
Indoor Use
Indoor Use
Certifications and compliances
Safety
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
Input Safety Rating
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.
Do not operate in environments where conductive
Pollutants may be present.
Pollution Degree 2
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.
EC Declaration
of Conformity
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 TM61340-2
Rev 2 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
AC Voltage Range: 0 ~ 750V AC
Accuracy: ±0.07% (Basic)
Calibrator
Fluke 5500 or Wavetek
9100 Calibrator or
equipment
Frequency Range: 40 ~ 1KHz
Accuracy: ±2%
DC Voltage Range: 0 ~ 1000V DC
Accuracy: ±0.006% (Basic)
Current Range: 0 ~ 10A
Accuracy: AC (40Hz to 1KHz): ±0.08% (Basic)
DC: ±0.02% (Basic)
Frequency Source: 1.00Hz ~ 10MHz
Accuracy: ±0.001%
Amplitude: 0.5V p-p ~ 5.0V p-p (square wave)
Accuracy: ±5%
Resistance Range: 1Ω ~ 100MΩ
Accuracy: ±0.03% (Basic)
Capacitance Range: 1pF ~ 10mF
Accuracy: ±0.10% (Basic)
Form Number TM61340-2
Rev 2 November 2007
Page 11
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
Figure 1
Form Number TM61340-2
Rev 2 November 2007
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 TM61340-2
Rev 2 November 2007
Page 13
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
Figure 2 Display Test
Form Number TM61340-2
Rev 2 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 “
” position.
2. Connect the calibrator to the
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:
Range
400mV
400mV
400mV
4V
Step
Input
-300.0mV
4.0mV
Reading
1
2
3
4
5
6
7
-297.3 to -302.7
3.6 to 4.4
300.0mV
3.000V
30.00V
300.0V
1000V
297.3 to 302.7
2.975 to 3.025
29.75 to 30.25
40V
400V
297.5 to 302.5
987 to 1013
1000V
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 TM61340-2
Rev 2 November 2007
Page 15
Table 2 AC Voltage Test:
Step
Range
Input
300mV
300mV
Frequency
Reading 61-340
295.6 to304.4
295.6 to304.4
Reading 61-342
1
2
400mV
400mV
60
295.6 to304.4
295.6 to304.4
400
4V
3
4
3.000V
3.000V
30.00V
30.00V
300.0V
300.0V
750V
60Hz
400Hz
60Hz
2.965 to 3.035
2.965 to 3.035
29.65 to 30.35
29.65 to 30.35
296.5 to 303.5
296.5 to 303.5
736 to 764
2.965 to 3.035
2.965 to 3.035
29.65 to 30.35
29.65 to 30.35
296.5 to 303.5
296.5 to 303.5
736 to 764
4V
40V
5
40V
6
400Hz
60Hz
400V
400V
750V
750V
7
8
400Hz
60Hz
9
10
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
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 1-3 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:
Range
400µA
400µA
4000µA
Step
Source
4.0µA
Reading
3.5 to 4.5
1
2
3
300.0µA
3000µA
297.4 to 302.6
2974 to 3026
Testing the DC milli amperes Function (for 61-340 and 61-342)
1. Connect the calibrator to the
and COM inputs on the meter.
2. Turn the rotary switch to
.
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 TM61340-2
Rev 2 November 2007
Page 16
Table 3b DC mA Test:
Range
40mA
Step
Source
30.00mA
300.0mA
Reading
1
2
29.73 to 30.27
297.3 to 302.7
400mA
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:
Range
Step
Source
3.000A
10.00A
Reading
4
1
2
2.950 to 3.050
9.80 to 10.20
10
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
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 1-6 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:
Range
400µA
400µA
400µA
400µA
4000µA
4000µA
Frequency
60
Step
Source
40µA
Reading
1
2
3
4
5
6
38.9 to 41.1
38.9 to 41.1
295.0 to 305.0
295.0 to 305.0
2950 to 3050
2950 to 3050
400
40µA
400
300.0µA
300.0µA
3000µA
3000µA
400
60
400
Form Number TM61340-2
Rev 2 November 2007
Page 17
Testing the AC milliampere function: (for 61-340and 61-342)
1. Connect the calibrator to the
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 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:
Range
40 mA
Step
Source
30.00mA
30.00mA
300.0mA
300.0mA
Frequency
60Hz
Reading
1
2
3
4
29.35 to 30.65
29.35 to 30.65
293.5 to 306.5
293.5 to 306.5
40 mA
400Hz
60Hz
400 mA
400 mA
400Hz
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
Source
3.000A
3.000A
10A
Frequency
60Hz
Reading
4A
4A
1
2
3
4
2.920 to 3.080
2.920 to 3.080
9.70 to 10.30
9.70 to 10.30
400Hz
60Hz
10A
10A
10A
400Hz
Form Number TM61340-2
Rev 2 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
and COM on the meter.
2. Turn the rotary switch to
.
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:
Range
400Ω*
400Ω*
4kΩ
Step
Source
4.0Ω
Reading
3.5 to 4.5
1
2
3
4
5
6
7
300.0Ω
295.9 to 304.1
2.968 to 3.032
29.68 to 30.32
296.8 to 303.2
2.968 to 3.032
29.35 to 30.65
3.000KΩ
30.00KΩ
300.0KΩ
3.000MΩ
30.00MΩ
40kΩ
400kΩ
4MΩ
40MΩ
*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
and COM inputs on the meter. For steps 1 through 7 in Table 6.
2. Turn the rotary switch to
.
a. Press the SELECT button to select the
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 TM61340-2
Rev 2 November 2007
Page 19
Table 6 Capacitance Test:
Range
40nF
Step
Source
10.000nF
30.00nF
300.0nF
3.000µF
30.00µF
100.0µF
1000µF
Reading
1
2
3
4
9.60 to 10.40
29.00 to 31.00
290.5 to 309.5
2.905 to 3.095
29.05 to 30.95
79.5 to 120.5
795 to 1205
40nF
400nF
4µF
5
6
7
40.00µF
100.0µF
1000µF
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
and COM inputs on the meter.
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:
1. Connect the DVM (Digital Voltage Meter) to the
and COM inputs on the meter.
2. Turn the meter’s rotary switch to
.
a) Press the SELECT button to select the
b) The DVM display should display OL
3. Insert a 50Ω resistor
function
a) The meter inner beeper will sound
Form Number TM61340-2
Rev 2 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:
Range
100Hz
100Hz
1kHz
Step
Source
9.0Hz
90Hz
Level
3V rms
3V rms
Reading
1
2
3
4
5
6
8.987 to 9.013
89.87 to 90.13
898.7 to 901.3
8.987 to 9.013
89.87 to 90.13
898.7to 901.3
3V rms
3V rms
3V rms
3V rms
900Hz
9kHz
10kHz
100kHz
1MHz
90kHz
900kHZ
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:
Range
1kHz
Step
1
Source
1kHz
Level
Reading
3V rms
48.3% to 51.7%
Form Number TM61340-2
Rev 2 November 2007
Page 21
Testing the Temperature Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s temperature function, do the following:
1. Connect the calibrator to the
and COM inputs on the meter.
2. Set the rotary switch to the ºF / ºC as instructed in Table 8.
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:
Range
ºC
Step
Source
0 ºC
Reading
-3 to 3
1
2
3
4
5
6
7
ºC
-20 ºC
300 ºC
750 ºC
-4 ºF
-23 to –17
288 to 312
725 to 775
-9 to 1
ºC
ºC
ºF
ºF
32 ºF
27 to 37
ºF
1382 ºF
1338 to 1426
Form Number TM61340-2
Rev 2 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 “
”
for the DC Volts function.
2. Set the output of DC calibrator for 300.0mV and connect to
meter.
and COM input terminals on
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. “
” for the AC Volts function.
2. Set the output of the calibrator for 3.000V at 60Hz and connect to
terminals on meter.
and COM input
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. “
” for the AC Volts Function.
5. Set the output of the calibrator for 3.000V at 60Hz. and connect to
terminals on meter.
and COM input
Form Number TM61340-2
Rev 2 November 2007
Page 23
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
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 TM61340-2
Rev 2 November 2007
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