Sanwa DG525 Manuale utente

04.09猯

DIGITAL INSULATION METER

INSTRUCTION MANUAL

–1 –

[1] Safety Precautions — Be sure to read before use. —

Be sure to read carefully the information under “ WARNING” and

“CAUTION” in this manual in order to prevent human injuries,

electric shock and damage to the instrument as well as other

equipment.

1-1 Warning Markings and Other Symbols

The symbols and their meanings used with the instrument and in

this manual are as described below.

■The following markings are used to indicate especially important

information for safe use of the instrument.

The information under this marking must be

observed strictly to prevent human injuries,

including burns and electric shock.

The handling information under this marking

should be observed carefully to prevent damage

to the instrument and associated equipment.

■Other symbols used with the instrument and in this manual

Indicates a risk of shock due to a high voltage

generated or applied at a measuring terminal.

EInsulation resistance measurement terminal (Earth =

GND)

LInsulation resistance measurement terminal (Line)

ACV~ AC voltage

MΩInsulation resistance

INSUL.

TEST VOLT Insulation test voltage ON indication

POWER Measuring power switch

HOLD Measurement value hold switch

LIGHT Back-light lighting switch

CAUTION

WARNING

–2 –

1-2 Warning Messages for Safety

1. Check the measurement type (insulation resistance or AC

voltage) before measurement and select the appropriate

function for it.

2. Do not apply a voltage or signal exceeding the specified

maximum allowable input. (For the maximum allowable

input voltage value, see section 1-3 on the next page.)

3. Do not open the case or battery cover unless replacing

the batteries as described in this manual.

4. Always use the specified test leads.

5. If the insulation coating of a test lead is damaged or its

conductor wire is exposed, do not attempt to repair it.

Instead, replace with a new test lead.

6. Do not switch the measuring function during measure-

ment.

7. Do not use the instrument when it is moistened, when

your hand is wet or when the ambient humidity is high

(85%RH or more).

8. Do not touch the metallic parts of the test leads during

measurement.

9. Do not use the instrument if it is defective and incapable

of making the specified measurements.

10.Do not use the instrument using high-power or higher-

voltage circuitry than the maximum allowable input.

11.Be sure to conduct annual inspections.

WARNING

–3 –

1-3 Maximum Allowable Input

Function Input Terminals Maximum Allowable Input

Insulation

resistance

ACV

E — MΩ— L

〜— ACV — 〜

Voltage or current

input prohibited

600 V AC

[2] Outline and Features

2-1 Outline

This instrument is a compact, handy high-performance digital

insulation tester with an additional AC voltage measuring function.

The characteristics of the voltages applied to the measuring

terminal during insulation resistance measurement are in compli-

ance with the output voltage characteristics specified in JIS C1302-

1994.

2-2 Features

1. Each instrument is capable of switching the voltages applied

during insulation resistance measurement in the following 2

ranges.

Model DG525: 500 V DC/250 V DC

Model DG251: 250 V DC/125 V DC

2. With both measuring functions, automatic range switching can

be used to switch the range according to the measurement

value.

3. Even when the user forgets to switch the power off after

measurement, the auto power OFF feature turns the power off

automatically in about 1 minute.

4. A back-light lamp is provided for easy readout, even in the dark.

5. The data hold feature holds the measurement value.

6. When the built-in batteries run out, the battery alarm display

indicates battery replacement timing.

–4 –

[3] External View and Names of Parts

(1) Measuring terminals

(Common for insulation

resistance and AC voltage)

(2) LCD (Liquid Crystal Display)

panel

(3) HOLD switch & indicator

(yellow LED)

(4) POWER switch

(5) INSUL. TEST VOLT ON

(Insulation test voltage ON)

indicator (red LED)

(6) Function switch

(7) LIGHT (back-light) switch

(8) Red test lead (for L/ 〜terminal)

(9) Black test lead (for E/ 〜

terminal)

(

)Aligator clip adapter

Reference When the point of (9) lead is inserted into clip adapter (10),

(9) will come to work as clip lead. It will make mesurement multipurpose.

TL-M54

–5 –

[4] Measurements

4-1 Preparation Before Measurement

For safe use of the instrument, check its appearance and

associated accessories carefully before use.

1. Check for damage due to dropping, etc.

2. There is a risk of electric shock if the insulation coating

of a test lead or its conductor wire is exposed. Check the

test leads carefully before use.

NOTE: Operation of the POWER Switch and Auto Power OFF

The POWER switch of the instrument toggles, or alternates

operation, so that each successive press switches the selected

measuring function from ON to OFF, and vice versa. The auto power

OFF feature provided turns power OFF automatically in about 1

minute, as a safeguard for when you forget to set the POWER

switch to OFF after use. Still, we recommend pressing the POWER

switch to OFF after measurement to save the power of the built-in

batteries.

NOTE: Operation of the HOLD Switch

To hold a measurement value, press the HOLD switch above the

POWER switch. The HOLD indicator (yellow LED) light up and the

current measurement value will be held in memory. Press the HOLD

switch again to clear the held value.

NOTE: Display Illumination by Back-Light

If the measurement value is hard to read under low light, press the

LIGHT switch on the bottom right of the panel.

The green back-light turns on to make the readout more visible. As

the back-light consumes power of the built-in batteries, we recom-

mend setting the LIGHT switch to off to save battery power when

measurement and readout are not required.

WARNING

–6 –

4-2 Checking the Built-in Batteries

1. Do not connect any leads to the measuring terminals.

2. Set the function switch to 500 V or 250 V with Model DG525 or

to 250 V or 125 V with Model DG251.

3. Press the POWER switch.

4. The built-in batteries are normal if the INSUL. TEST VOLT ON

indicator (red LED) lights up and the LCD looks as shown in

Fig. 1.

Fig. 1

5. If the INSUL. TEST VOLT ON indicator does not light and the

LCD shows nothing, even when the POWER switch is pressed to

ON, the batteries may be exhausted completely, or no battery

has been loaded. In this case, remove the battery cover on the

rear case and insert new batteries as described in section 4-3,

“Replacing the Built-in Batteries” on the next page.

6. If the INSUL. TEST VOLT ON indicator does not light and the

LCD shows nothing, although unexhausted batteries are loaded,

it is possible that the battery terminal contacts have failed. In this

case, remove the battery cover on the rear case and check the

contacts between the batteries and terminals.

7. If the INSUL. TEST VOLT ON indicator lights up but the LCD

shows the “B” marking as shown in Fig. 2 when the POWER

switch is pressed to ON, the built-in batteries are nearly

exhausted. In this case, replace them with new batteries.

Fig. 2

–7 –

4-3 Replacing the Built-in Batteries

1. Set the function switch to OFF on the center position.

Make sure that the function switch is set to OFF before

proceeding to the battery replacement operation.

2. Refer to Fig. 3 below for the battery replacement.

3. Remove the lock screw on the battery cover on the rear case,

then remove the battery cover by sliding it down while pushing the

square projection on the top center (Fig. 3[A]) with your finger, and

insert batteries in correct polarity positions as shown by Fig. 3[B].

4. After checking that the batteries have been inserted correctly,

place the battery cover in the original position on the rear case

and fasten with the lock screw.

1. Always use the specified batteries (LR6/AA size alkaline

batteries).

2. To prevent performance degradation, replace all six

batteries with six brand-new ones when the time comes

to replace batteries.

WARNING

Battery cover

3 mm lock

screw

• Battery cover

1.5 V LR6/AA size alkaline

batteries (x 6)

• Battery polarity

Fig. 3

Slide while

pushing

[A] [B]

CAUTION

–8 –

4-4 Measuring the Insulation Resistance (MΩ)

1. When the power is ON with the insulation resistance

measuring function selected (when the INSUL. TEST

VOLT ON indicator is lit), a high voltage for insulation

resistance measurement is applied across the E-L

terminals. To avoid the risk of electric shock, do not touch

the metallic parts of the test leads connected to the

measuring terminals.

2. Make sure that the object to be measured is not sub-

jected to voltage before proceeding to measurement.

3. Certain measurement objects (capacitive objects, for

example) may retain the voltage applied from this

instrument for some time after the completion of the

measurement.

1. Set the function switch according to the measurement object, to

500 V or 250 V with Model DG525 or to 250 V or 125 V with

Model DG251.

2. Connect the black plug of the black test lead to the E terminal on

the left and the amber plug of the red test lead to the L terminal

on the right as shown in Fig. 4.

Black

Red

Fig. 4

3. Connect the black clip to a measuring point on the measurement

object and the tip of the red test rod to the other point, and press

the POWER switch. The INSUL. TEST VOLT ON switch will light

up and the resistance measurement value will be shown on the

LCD.

WARNING

–9 –

4. When the measurement object has resistance of more than 2000

MΩ, the LCD shows the same over-input display as that displayed

when the measuring terminals are open, as shown in Fig. 1 under

section [4]4-2, “Checking the Built-in Batteries” on page 6.

5. After measurement, press the POWER switch again to OFF or

set the function switch to OFF.

NOTE: Distinction Between E and L Terminals

When one of the measuring points is grounded, connect it to the E

terminal of the instrument.

This is specified in consideration of safe use, because the resis-

tance measurement value reading in the insulation testing can be

reduced in this way. In other measurement operations, consideration

of the polarity of measurement points is not necessary.

NOTE: In Case the “B” Marking is Displayed During Measurement

When the resistance measurement value in an insulation test is

extremely small, the LCD sometimes shows the “B” marking which

is usually used as the battery alarm indicator.

In the present case, the “B” marking is displayed because an

extremely small resistance measurement value means consumption

of large battery current and the drop in capacity due to exhaustion

of the batteries causes the internal operating voltage to fall below

the specified level.

4-5 Measuring the AC Voltage (ACV)

1. The maximum allowable input voltage of the ACV range is

600 V. Never apply a higher voltage than this.

2. Voltages higher than 25 Vrms AC are hazardous to the

human body. Be very careful during measurement.

3. Never attempt to change the function switch position

during measurement.

4. Never measure AC voltage with a wet hand.

WARNING

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