PM300
DIGITAL MULTIMETER
INSTRUCTION MANUAL

Dempa Bldg., 4-4 Sotokanda 2-Chome
Chiyoda-ku, Tokyo 101-0021, Japan
03-1712 2040 6006

[1] SAFETY PRECAUTIONSBefore use, read the following safety precautions.
This instruction manual explains how to use your new digital multimeter
PM300 safely.
Before use, please read this manual thoroughly. After reading it, keep it
together with the product for reference to it when necessary.
If you use the product in a method not specified in this manual, theprotection function of the product may be imperiled.
The instruction given under the heading of “ WARNING” and “ CAUTION”
must be followed to prevent accidental burn or electrical shock.
1-1 Explanation of Warning Symbols
The meaning of the symbols used in this manual and attached to the
product is as follows.
: Very important instructions for safe use.
• The WARNING messages are intended to prevent accidents tooperating personnel such as burn and electrical shock.
• The CAUTION messages are intended to prevent damage to the
instrument.
Symbols attached to the product: Symbol soliciting reference to this manual before use: Double or enhanced insulation: Ground: Resistance: Diode: Buzzer: Capacitance

4. Never use the meter for measuring the line connected withequipment (i.e. motors) that generates induced or surge voltage
since it may exceed the maximum allowable voltage.
5. Never use meter if the meter or test leads are damaged or broken.
6. Never use uncased meter.
7. Always keep your fingers behind the finger guards on the probe
when making measurements.
8. Be sure to disconnect the test pins from the circuit whenchanging the function.
9. Before starting measurement, make sure that the function isproperly set in accordance with the measurement.
10. Never use meter with wet hands or in a damp environment.
11. Never open tester case except when replacing the battery.
Do not attempt any alteration of original specifications.
12. To ensure safety and maintain accuracy, check the meter in thestart-up inspection as well as in the inspection/calibration to be
performed at least once a year.
13. The meter is for indoor use only.
14. Wear insulating protective gear when using the meter withequipment containing a hazardous live part. Also be sure toobserve your local and national safety rules.
15. Always use the meter in a specified method to prevent theprotective function from being imperiled.

Function

Input terminals

Max. rated input value

ACV / HzDCV
/ / /+ (Red)and− (Black)

AC 600 V
DC 600 V
Voltage input prohibited

5-4-1 Resistance measurement ( )If measurement is likely to be influenced
by noise, shield the object to measure
Resistorwith negative potential (COM). If a finger
touches a test pin during measurement,
measurement will be influenced by theresistance in the human body, and that
results in measurement error.
The open voltage across the measurement
terminals is about DC 1.2 V.

Forward test

[2] APPLICATIONS AND FEATURES[4] DESCRIPTION OF FUNCTIONS

2-1 Applications
This instrument is a pocket-type digital multimeter with rms value response, designed for measurements within the range specified as CAT.
IV 300 V/CAT.III 600 V in IEC61010.

4-1 Power/Function switch
Turn this switch to turn on and off the power and to switch themeasuring functions.

[3] NAMES OF COMPONENT UNITS
3-1 Multimeter and test leads
Display

Test pins

Removable
test pin covers

HOLD button

View when notattached

SELECT button

FingerguardsRemovable test pin covers
When covered : CAT.IV 300 V
CAT.III 600 V
When uncovered : CAT.II 600 V
Test probe (Red)Power/Function
switchTest probe (Black)6-3 Cleaning and storage
CAUTION

1. The main unit is not resistant to volatile solvent and must not
be cleaned with lacquer thinner or alcohol. If it gets dirty, wipe
lightly with a soft cloth moistened with a small amount of water.
2. The main unit is not resistant to heat. Do not place it near asource of high heat.
3. Do not store the instrument in a place where it may be subjected
to excessive vibrations or from where it may fall.
4. For storing the instrument, avoid hot, cold or humid places orplaces under direct sunlight or where condensation is anticipated.
5. When the instrument is not to be used for a long period, be sure
to remove the battery from it.

Reverse test

Diode
CathodeAnode

WARNING

1. If the rear case is removed with input applied to the input
terminals, you may get electrical shock. Before starting the work,
always make sure that no input is applied.
2. Before starting the work, be sure to turn OFF the main unit
power and release the test leads from the circuit.

Example of Good item:
Example of Good item:“OL” display
Forward voltage drop display
Example of NG item:
Example of NG item:
Other display
0.000 V display, “OL” display① Turn the rear case retaining
screw (x 1) with a Phillips
screwdriver, and remove the rearcase.
Replacethe battery(CR2032) by②
taking care of the polarity (sothat the “+” indication is visible
from you).
Attachthe rear case and tighten③
the retaining screw.

)
The buzzer beeps at 10 to 50 Ω or less.

)

Discharge the capacitor before measurement.
It takes a while to measure large capacitance.
This measurement is not suitable formeasurement of a capacitor with a high leakcurrent such as an electrolytic capacitor.

[6] MAINTENANCEWARNING

1. This section is very important for safety. Read and understand thefollowing instruction fully and maintain your instrument properly.
2. The instrument must be calibrated and inspected at least once a
year to maintain the safety and accuracy.
6-1 Maintenance and inspection
1) Appearance• Is the appearance not damaged by falling?
2) Test leads• Is the cord of the test leads not damaged or the core wire notexposed at any place of the test leads?
If any of the above is found with the appearance, do not use theequipment and have it repaired.
6-2 Calibration
The manufacturer may conduct the calibration and inspection. For more
information, please contact the dealers.

− 5 −Cap accommodation space

AC/DC 600 V

Measurement categories (Overvoltage categories)
CAT. II : Primary circuit of equipment with a power cord to be connected
to a mains socket.
CAT.III : Primary circuit of equipment that inputs power directly fromthe distributor and the circuit from the distributor to the mains
socket.
CAT.IV : Circuit from the leading wire to the distributor.

4-7 Data Hold : HOLD button
When the HOLD button is pressed, the current display is hold (appears on the display). The display will not be changed even when the
input varies thereafter. Press the button again to cancel the Data Holdon the display disappears).
mode (* The Data Hold mode is also canceled when the function switch isswitched or the SELECT button is pressed.

[5] MEASUREMENT PROCEDUREWARNING

Lead accommodation space

AC/DC 660 V

6-4 Battery replacement)

5-4-4 Capacitance measurement (Probe accommodation space

Max. overload
protection input

2-2 Features• Safety design compliant to IEC61010.
• AC measurements with True RMS conversion.
• High portability using the carrying case provided as standard.

• Current measurement display : The meter stores the maximum and minimum
values while displaying the current measurement value. The buzzer beeps
every time a value is updated. The maximum and minimum values can bechecked by pressing the button to view the MAX value display and MIN value
display. To cancel the MAX/MIN mode, press the button for 1 sec. or more.
• MAX value display : Maximum value measured since the entry in MAX/MIN mode.
• MIN value display : Minimum value measured since the entry in MAX/MIN mode.
The MAX/MIN mode can also be entered when the relative value
measurement function is active (△ displayed). In this case, the MAX/
MIN mode displays the relative values assuming that the value at the
moment the button is pressed is 0 (reference value).
MAX/MIN memory mode is not available in the Hz, ,andfunctions.
* The MAX/MIN mode is canceled when the function is switched.

4-8 Disable Buzzer
When the meter is switched on while holding the △REL button, thefor 2 seconds and the buzzer beep is canceled. Even
display shows
when the buzzer is canceled, it still beeps in the case of OL alarm, in thecontinuity check, when the meter is turned on and before Auto Power
Save. To enable all of the buzzer sounds, turn the meter off then on again.
* This mode cannot be used when the Auto Power Save function is canceled.

4-2 Auto Power Save
The Auto Power Save function turns the display off automatically in about 15
minutes after the last operation or after an input of 20 V or higher was applied tosave the power consumption. To return from this status, press the SELECT button
or turn the power switch to OFF then to another position.
To disable the Auto Power Save function, switch the meter on by turning thefunction switch while holding the SELECT button depressed. A short buzzer beep
” is displayed for 2 seconds, and the indicator disappears.
is generated, “* A small current flows inside the meter even in the Auto Power Save status.
After measurement, always turn the function switch to the OFF position.

1. Never apply an input signal exceeding the maximum rating input
value of each function.
2. Be sure to disconnect the test pins from the circuit when changing the function.
3. Always keep your fingers behind the finger guards on the probe
when making measurements.
4. After measurement, release the red and black test pins from theobject measured and set the function switch to the OFF position.

5-1 Start-up inspection
Check the following items before starting the daily measurement work.
• Appearance check : Check the appearance of the meter to see if it
is free from damage caused by falling, etc.
• Accessory : Check that the test leads are free from irregularities
such as wire disconnection and crack.
• Battery: Install the battery before using the meter for the first time.
Ensure that the
low battery indication is not displayed and, if it isdisplayed, replace the battery with new one. If nothing is displayed,
the battery may be exhausted totally (see 6-4).
• Test lead wire disconnection can be checked by setting the function
switch to and shorting the test pins.
• Also check that the meter and your hands are not moistened by water, etc.
5-2 AC voltage measurement (ACV), frequency measurement (Hz)Set the function switch to ACV.
Each press of the SELECT buttonalternates ACV and Hz.

4-3 Low battery indication
When the battery is exhausted until the supply voltage drops below about 2.3 V, theindicator lights on the display. Replace the battery when this indicator appears.

appears on
While selecting ACV,
the display when a voltage of 20 V or
more is input.
At the moment the input exceeds 20 V,
the buzzer beeps to indicate it.

4-4 Measurement function selection : SELECT button
When the SELECT button is pressed, the functions change as follows.
ACV position : ACV → Hz → ACV → …
position : →→→→ →…
4-5 Relative value measurement : △ REL button
When the△REL button is pressed, △ appears on the display, the measuring
range is fixed and the display shows the relative values assuming that the value
at the moment the button is pressed is 0 (reference value). When the button ispressed again, △ disappears and the relative value measurement is canceled.
Relative value measurement mode is not available in the Hz, andfunctions.
* The △REL mode is also canceled when the function is switched.
4-6 MAX/MIN memory : △ REL (MAX/MIN) button
When the △ REL button is held depressed, the meter enters the MAX/
MIN mode, in which the measurement range is fixed and the Auto
Power Save and Relative value measurement functions are canceled.
• Every time the SELECT button is pressed, the displayed information
changes as follows : Current measurement display (MAX MIN displayed)→ MAX value display (MAX displayed) → MIN value display (MIN displayed)→ Current measurement display (MAX MIN displayed) → …

− 2 −Set the function switch to
Each press of the SELECT button switches the function in order of
→
→
→
→ …

5-4-3 Continuity check (3-3 Using the carrying case

1-3 Overload protections− 1 −5-4-2 Diode test (: Voltage alarm: Data Hold indicator: Auto Range indicator: Low battery indication: Auto Power Save indicator: Relative operation indication: Continuity check: Diode: Capacitor: Alternative Current: Direct Current: MAX/MIN mode indicator

CAUTION△REL button

WARNING

Unit

1. Correct measurement may not be performed when using themeter in a ferromagnetic/intense electric field such as a placenear a transformer, high-current circuit or a radio.
2. The meter may malfunction or correct measurement may not
be performed when measuring a special waveform such as thatfrom an inverter circuit.

1-2 Warning Instructions for Safe Use

The following instructions are intended to prevent personal injury
such as burn and electric shock. Be sure to follow them when using
the tester.
1. This instrument is a digital multimeter for metering low voltages.
Never use it on electric circuits that exceed CAT.IV 300 V or CAT.III
600V.
2. Pay special attention when measuring the voltage of AC 33 Vrms
(46.7 V peak) or DC 70 V or more to avoid injury.
3. Never apply an input signal exceeding the maximum rating input
value (see 1-3).

3-2 Display

5-3 DC voltage measurement (DCV)
Set the function switch to DCV.
appears on the display when avoltage of 20 V or more is input.
At the moment the input exceeds 20 V,
the buzzer beeps and the backlight
flashes to indicate it.

5-4 Resistance ( ), diode ( ), continuity (• Never apply voltage to the input terminals.

− 4 −

Note:
1) Prior to requesting repair, please check the following:• Capacity of the built-in battery and polarity of installation.
• Discontinuity of the test leads.
2) Repair during the warranty period:
The failed meter will be repaired in accordance with the conditions
stipulated in 7-1, Warranty and provision.
3) Repair after the warranty period has expired:• When the original functionality is expected to be restored by repair,
we will repair the product upon request and payment by the customer.
• In some cases, repair and transportation cost may become higher
than the price of the product. Please contact Sanwa authorized
agent/service provider in advance.
• The minimum retention period of service functional parts is six (6) years
after the discontinuation of manufacture. This retention period is therepair warranty period. Please note, however, if such functional parts
become unavailable for reasons of discontinuation of manufacture,etc., the retention period may become shorter accordingly.
4) Precautions when sending the product to be repaired• To ensure the safety of the product during transportation, place theproduct in a box that is larger than the product 5 times or more involume and fill cushion materials fully.
• Clearly mark “Repair Product Enclosed” on the box surface.
• The cost of sending and returning the product shall be borne by the customer.

8-2 Measurement ranges and accuracies
Accuracy-assured temperature/humidity ranges: 23±5 ºC, ≤ 80 %RH,
no condensation.
rdg: reading. dgt: digits (lowest digits)
As the ACV measurements employ the rms value response, theaccuracy-assured ranges and crest factor become as follows.
Accuracy range: 1 % to 100 % of measurement range.
Crest factor CF: Full scale CF < 1.8, half scale CF < 3.6.

7-3 SANWA web site
http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp

Function

Range
6.000 VAC voltage
ACV

60.00 V
600.0 V

Input resistance: About 10 MΩ
• Accuracy not assured below
10 Hz.
Frequency±(0.5%rdg+3dgt)• Sensitivity
9.999 kHzHz
10 Hz – : ≥1 Vrms
10 kHz – : ≥15 Vrms
99.99 kHz(It is limited to a sine wave.)
Input resistance: About 10 MΩ
600.0 mV
99.99 Hz999.9 HzDC voltage
DCV

6.000 V
60.00 V± (0.8 %rdg+3 dgt)

600.0 V
600.0 Ω[8] SPECIFICATIONS

6.000 kΩ

8-1 General specifications

Accuracy
Remarks± (1.2 %rdg+9 dgt) Input resistance: About 10 MΩ
• Accuracy-assured
frequencies :± (1.2 %rdg+5 dgt)
45 Hz – 500 Hz

Resistance

60.00 kΩ• Open voltage: About DC
1.8 V• Measurement current± (1.5 %rdg+5 dgt)
varies depending on theresistance value of theobject measured.

△ - Σ method

600.0 kΩAC detection method

True RMS method (AC coupling)

6.000 MΩ ± (2.0 %rdg+ 5 dgt)

Display

Max. 6000 counts

Sampling rate

Max. approx. 5 times/sec.

Overload indication“ OL” mark indication on digital display

Range selection

Auto[7] AFTER-SALE SERVICE

Polarity switching

Auto (“-” indicated when negative voltage is input)

7-1 Warranty and provision
Sanwa offers comprehensive warranty services to its end-users andto its product resellers. Under Sanwa's general warranty policy, each
instrument is warranted to be free from defects in workmanship ormaterial under normal use for the period of one (1) year from the date ofpurchase.
This warranty policy is valid within the country of purchase only, andapplied only to the product purchased from Sanwa authorized agent or
distributor.
Sanwa reserves the right to inspect all warranty claims to determine theextent to which the warranty policy shall apply. This warranty shall not
apply to disposables batteries or any product or parts which have been
subject to one of the following causes:
1.A failure due to improper handling or use that deviates from the
instruction manual.
2. A failure due to inadequate repair or modification by people other than
Sanwa service personnel.
3. A failure due to causes not attributable to this product such as fire,
flood and other natural disaster.
4. Non-operation due to a discharged battery.
5. A failure or damage due to transportation, relocation or dropping after
the purchase.

Low battery indication

mark displayed when battery voltage
drops at 2.3 V or less.

− 6 −

)

− 3 −

Operation method

7-2 Repair
Customers are asked to provide the following information whenrequesting services:
1. Customer name, address, and contact information
2. Description of problem
3. Description of product configuration
4. Model Number
5. Product Serial Number
6. Proof of Date-of-Purchase
7. Where you purchased the productPlease contact Sanwa authorized agent / distributor / service provider,listed in our website, in your country with above information. An
instrument sent to Sanwa / agent / distributor without those information
will be returned to the customer.

) , capacitance (WARNING60.00 MΩ ± (4.0 %rdg+ 5 dgt)
Diode test

Open voltage: About DC 3.2 V“OL” displayed at 3.000 V or more.

Continuity check

Open voltage: About DC 1.0 V
Buzzer beep generated at 10
to 50 Ω or less.

Operating environmental Altitude ≤2000 m, indoor use, pollution
conditions
degree II
Operating temperature/humidity ranges-10 ºC to 40 ºC.
Humidity range is as follows (without
condensation):Max. 80 %RH at 5 ºC to 31 ºC, decreasing
linearly to 50 %RH at 40 ºC.

Storage temperature/humidity range-20 ºC to 40 ºC: ≤80 %RH (without condensation).
40 ºC to 50 ºC: ≤70 %RH (without condensation).
(The battery should be removed when the
instrument is not to be used for a long period.)

Temperature coefficient

Below 18 ºC and above 28 ºC: Accuracy x
0.15 should be added per ºC. (Accuracy x
0.25 should be added in thefunction.)

Power supply

CR2032 (Coin-shaped lithium battery)3 V × 1

Auto Power Save

Power Save in about 15 minutes after lastoperation. Typ. 20 µA

Current drain

About 1.5 mA, max. about 5 mA

Battery life

About 150 hours

Dimensions & mass

110 (H) x 56 (W) x 13 (D) mm, about 84
grams (incl. the battery)
121 (H) x 63 (W) x 28 (D) mm, about 135
grams (when stored in case)

Test lead length

About 0.5 m

Safety standards

IEC61010-1, IEC61010-2-030, IEC61010-2-33,
IEC61010-31 CAT.IV 300 V/CAT.III 600 V

Capacitance

60.00 nF ± (3.0 %rdg+10 dgt) Auto range only.
Accuracy with a capacitor
600.0 nF
with low leak current such
6.000 μF
as a film capacitor or equiv60.00 μF ± (5.0 %rdg+10 dgt) alent.
Less than 10 nF add +15 dgt
600.0 μF
to the accuracy.

Accuracy calculation method
Example) AC voltage measurement (ACV)
Displayed value: 100.0 V
Range accuracy: 600.0 V range ±(1.2 %rdg+5 dgt)
Error: ±(100.0 V x1.2 %rdg+5 dgt) = ±1.7 V
True value: 100.0 V±1.7 V (between 98.3-101.7 V)* In the 600.0 V range, 5 dgt corresponds to 0.5 V.
Specifications and external appearance of the product describedabove may be revised for modification without prior notice.

EMC Directive, RoHS Directive IEC61326 (EMC), EN50581 (RoHS)
Accessories

Instruction manual, coin-shaped battery(CR2032), carrying case (C-PM300)

− 7 −

− 8 −