Sperry instruments 3121 Manuale utente

MODEL 3121・3122・3123

Model-3121・3122 Model-3123

HIGH VOLTAGE INSULATION TESTER

OPERATING INSTRUCTIONS

7/05 FORM#341

CONTENTS

Page

1．Features …………………………………………………………1

2．Speciﬁcations ……………………………………………2〜3

3．Instrument Layout ………………………………………………4

4．Operating Instructions …………………………………………5

4-1．Mechanical Zero Adjustment ……………………………5

4-2．Battery Check ……………………………………………5

4-3．Insulation Resistance Measurement ……………………6

4-4．Continuous Measurement ………………………………6

4-5．Use of Guard Terminal …………………………………7

5．Battery Replacement ………………………………………8

6．Cleaning Meter Cover ………………………………………8

− 1 −

1. Features

● Battery powered, the instruments test insulation up to

100000MΩ at 2500V for Model 3121, 200000MΩ at 5000V

for Model 3122 and 200GΩ at 5000V and 400GΩ at 10000V

for Model 3123.

● Suited for heavy duty electrical maintenance and servicing of

industrial installations, cables, transformers, generators and

switchgear where high voltage insulation tests are required.

● Dual scales for low and high ranges which change

automatically. Colour coded scales for easy reading plus

LED's that illuminate in matching colour.

● Drip proof construction. The case is sealed with rubber

gaskets to protect internal circuit against rain.

● Hard carrying case furnished as standard accessory. Houses

both instrument and test leads in compact form. Made of

plastic, it is highly water resistant.

● Designed for low power consumption. Since the maximum

current consumption is 90mA eight pieces of 1.5V SUM-3（or

equivalent ） permit about 6 hours of continuous operation

even when the instrument is used on maximum load or twice

longer on minimum load.

● Rated output voltage is maintained down to 100MΩ for Model

3121,200MΩ for Model 3122 and 0.2GΩ/0.4GΩ for Model

3123. This permits accurate measurements of low insulation

resistance.

− 2 −

Model 3121 Model 3122 Model 3123

DC Test Voltage 2500V 5000 V 5000V10000V

Measuring Ranges

0〜2000MΩ/

1000〜100000MΩ

（automatic change）

0〜5000 MΩ/

2000〜 200000MΩ

(automatic change)

0〜5GΩ/2〜200GΩ

(automatic change)

0〜10GΩ/4〜400GΩ

(automatic change)

Accuracy Insulation

Resistance

±5% of reading

（100〜50000MΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（100〜50000MΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

±5% of reading

（200〜 100000MΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（200〜 100000MΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃ 〜＋40℃

±5% of reading

（0.2〜100GΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（0.2〜100GΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

±5% of reading

（0.4〜200GΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（0.4〜200GΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

Output

Voltage

2500V ±5%

（100〜50000MΩ）

5000V ±5

（200〜 100000MΩ）

5000V ±5%

（0.2~100GΩ）

10000V ±5%

（0.4~200GΩ）

Operating

Temperature & Humidity −10℃ 〜＋40℃ at 85% max. relative humidity

Storage

Temperature & Humidity −20℃ 〜＋60℃ at 90% max. relative humidity

Insulation Resistance 1000MΩ max./ 1000V between electrical circuit & housing case

Withstand Voltage 5000V AC for one minute between electrical circuit & housing case

Dimensions 200（L）×140（W）×80（D）mm

Weight Approx. 1kg（including batteries & line probe）

Power Source 8 pcs of 1.5V SUM-3 battery or equivalent

Accessories Hard Carrying Case, Batteries, Test Leads （earth & guard leads）

2. Speciﬁcations

− 3 −

Model 3121 Model 3122 Model 3123

DC Test Voltage 2500V 5000 V 5000V10000V

Measuring Ranges

0〜2000MΩ/

1000〜100000MΩ

（automatic change）

0〜5000 MΩ/

2000〜 200000MΩ

(automatic change)

0〜5GΩ/2〜200GΩ

(automatic change)

0〜10GΩ/4〜400GΩ

(automatic change)

Accuracy Insulation

Resistance

±5% of reading

（100〜50000MΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（100〜50000MΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

±5% of reading

（200〜 100000MΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（200〜 100000MΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃ 〜＋40℃

±5% of reading

（0.2〜100GΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（0.2〜100GΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

±5% of reading

（0.4〜200GΩ）

±10% of reading

or 0.5% of scale length

（ ranges other than

listed above）

at 23℃ ±5℃

±10% of reading

（0.4〜200GΩ）

±20% of reading

or 1.0% of scale length

（ ranges other than

listed above）

at −10℃〜＋40℃

Output

Voltage

2500V ±5%

（100〜50000MΩ）

5000V ±5

（200〜 100000MΩ）

5000V ±5%

（0.2~100GΩ）

10000V ±5%

（0.4~200GΩ）

Operating

Temperature & Humidity −10℃ 〜＋40℃ at 85% max. relative humidity

Storage

Temperature & Humidity −20℃ 〜＋60℃ at 90% max. relative humidity

Insulation Resistance 1000MΩ max./ 1000V between electrical circuit & housing case

Withstand Voltage 5000V AC for one minute between electrical circuit & housing case

Dimensions 200（L）×140（W）×80（D）mm

Weight Approx. 1kg（including batteries & line probe）

Power Source 8 pcs of 1.5V SUM-3 battery or equivalent

Accessories Hard Carrying Case, Batteries, Test Leads （earth & guard leads）

（Optional adaptor model 8020 is available for connection to recorder）

− 4 −

3. Instrument Layout

① Line Probe

③ Earth Terminal

⑤ Press to Test Button

⑥ Function Switch

①

②③

④④

⑤ ⑥ ⑦

Fig.1

② Guard Terminal

④ LED's for High&

Low Range Indication

⑦ Battery Compartment

Cover

− 5 −

CAUTION:

BE CAREFUL ABOUT HIGH VOLTAGE PRESENT ACROSS LINE

AND EARTH TERMINALS OF INSTRUMENT WHEN PRESS TO

TEST BUTTON IS OPERATED. MAKE SURE TO EARTH CIRCUIT

UNDER TEST. ALWAYS CONNECT EARTH TERMINAL OF

INSTRUMENT TO EARTH. THE BUZZER WILL KEEP SOUNDING

DURING INSULATION RESISTANCE MEASUREMENT.

4-1. Mechanical Zero Adjustment

With the function switch set at OFF position, adjust the meter

pointer to ∞ mark on the scale. Use a screwdriver to turn the

zero adjust screw located at the center of the front panel.

4-2. Battery Check

With the function switch set at BATT. CHECK position, operate the

press to test button. The batteries are good when the pointer stays

in BATT. GOOD area or to the right of this area. If not, replace them.

Note: Refrain from holding down or locking the press to

test button during this as it will result in current

consumption larger than insulation resistance

measurement while the batteries are still new.

4. Operating Instructions

− 6 −

4-3. Insulation Resistance Measurement

With the function switch set at OFF position, always connect the

circuit under test to earth. Attach the test lead to the earth terminal

of the instrument and connect to the earthed side of the circuit

under test. With the function switch set at MΩ position for Model

3121 and 3122 or GΩ position for Model 3123, place the line

probe in contact with the circuit under test and operate the press

to test button. When the green LED illuminates, read insulation

resistance on the outer scale(for high range). Use the inner scale

where the red LED illuminates. For insulation testing at 5000V and

10000V, read the black and red scales respectively (for Model

3123). After a test, release the press to test button and wait for

several seconds without disconnecting the line probe from the

circuit tested. This is intended to discharge the charge stored in the

circuit tested.

4-4. Continuous Measurement

Make sure that the circuit under test is earthed and that the test

lead attached to the earth terminal of the instrument is connected

to the earthed side of the circuit under test. Push the press to test

button and turn clockwise to lock for continuous measurement.

When making this measurement, good care must be taken against

the high voltage continuously present across the line and earth

terminals of the instrument.

Note: Make certain that the circuit under test does not

include components which will be damaged by the

high voltage applied.

− 7 −

4-5. Use of Guard Terminal

Illustrated in Fig. 2 is an example of the insulation resistance

measurement of an electric wire. If the line probe is simply

connected to the wire conductor and the earth lead to the

immersion liquid container as shown, a measurement error will be

introduced as this results in the measurement of the combined

resistance of insulation resistance and the surface leakage

resistance at the cut end of the electric wire. In order to remove

this surface leakage current, wide a guard wire around the cut

end of the conductor and connect it to the guard terminal of the

instrument using the guard lead. Then, the surface leakage current

will bypass the indicating meter of the insulation resistance tester.

GUARDWIRE

ELECTRIC

WIRE

IMMERSIONLIQUID

EARTH GUARD LINE

Fig.2

− 8 −

Remove the battery compartment cover by loosening the screw located

on the back of the housing case. Replace the whole battery pack. Alkaline

batteries are recommended where the instrument is used at a temperature

below the freezing point. The ordinary manganese batteries will deteriorate

below the freezing point.

（For your information, optional adaptor Model 8020 is available to allow

Model 3121,3122 and 3123 to be connected to a recorder for recording

insulation resistance. It provides an output signal of 1 μA/10mV DC.）

5. Batttery Replacement

6. Cleaning Meter Cover

Do not try to remove dirt on the meter cover by rubbing hard with a dry

cloth. This can remove anti-electrostatic agent applied to the surface of the

surface of the meter cover.

When the meter reading is affected by electrostatic build up on the meter

cover, wipe the meter cover surface using a cloth dampened with off-the

shelf anti-static agent or detergent.

To avid possible deforming or discoloring, do not use solvents.

To clean the body of the instrument, use cloth dampened with detergent.

CAUTION

Never use paint thinner, benzene or other solutions containing solvents

for cleaning the instrument.

Otherwise, deforming or discoloring of the instrument body or the

meter cover may result.

Note:

Handle the instrument with care and follow the instructions in order

to maintain it in good condition for a long period of time.

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