KYORITSU KEW 1109 Manuale utente

INSTRUCTION MANUAL

ANALOGUE MULTIMETER

KEW 1109S

Table of Contents

Page

1. Safety Warnings ............................................................................... 1

 • Understanding Some of the Basics in Electrical Testing

 Before Using the Multimeter .......................................................... 3

2. Features ........................................................................................... 5

3. Specifications .................................................................................... 6

4. Instrument Layout ............................................................................. 8

5. How to Read Scales ......................................................................... 9

6. Operating Instructions ..................................................................... 11

6-1 Preparation ................................................................................ 11

6-2 DC Voltage Measurements ...................................................... 12

6-3 AC Voltage Measurements ....................................................... 13

6-4 Low Frequency (dB) Measurements ........................................ 14

6-5 AC Output Voltage Measurements Using Output

Terminal ................................................................................... 15

6-6 DC Current Measurements ...................................................... 16

6-7 Resistance Measurements ....................................................... 17

6-8 Terminal Current LI, Terminal Voltage LV &

Diode Test ................................................................................ 20

6-9 Measuring ICEO (leakage current of transistors) ......................... 22

6-10 Measuring hFE (DC Current Amplification Factor) ................... 24

7. Fuse & Battery Replacement .......................................................... 27



1. Safety Warnings

The instrument must be used by a competent, trained person and

operated in strict accordance with the instructions. Kyoritsu Electrical

Instruments Works, Ltd will not accept liability for any damage or injury

caused by misuse or non-compliance with the instructions or safety

procedures. It is essential to read and understand the safety rules

contained in the instructions. They must be observed when using the

instrument.

●This instruction manual contains warnings and safety rules

which must be observed by the user to ensure safe operation of

the instrument and retain it in safe condition for a long period.

Therefore, read these operating instructions thoroughly and

completely before using the instrument.

#WARNING

This is a warning for the user to avoid electric shock hazard.

The symbol #on the instrument means that the user must read the

instructions in this manual for safe operation of the instrument.

#CAUTION

This is a caution for the user to avoid damage to the instrument.

#WARNING

● Never open the back case during measurements.

● Never use the instrument to measure voltage higher than 250V

on an industrial power line.

● When measuring a high voltage greater than 250V (in small

power supply circuit and not on power transmission line),

connect the test leads to the circuit under test after it is once

de-energized. Do not touch the wiring or test leads by hand

during voltage measurements. After the measurements, turn off

power to the circuit under test and disconnect the test leads.

Never test a circuit voltage higher than 250V with the range

selector switch erroneously set to one of the current or

resistance range positions. The fuse may not protect the circuit.



● Never use the instrument in an explosive atmosphere especially

when making current measurements.

#CAUTION

● Before making measurements check that the range selector

switch is at a proper range position. Make sure to remove the

tips of the test leads from the circuit under test when changing

the measuring range during measurements.

● Do not apply voltage to the current or resistance ranges. It may

result in a fuse blow or instrument damage.

● Make certain to set the range selector switch to the OFF position

after every use.

● It is recommended that the range selector switch should be set

to the 250mA DC position to protect the instrument against the

possible shock or vibration in transit.

Note: Take good care not to make voltage measurements with

the range selector switch at the 250mA DC position. The

fuse may blow or instrument get damaged.

● Do not expose the instrument to the direct sun, extreme

temperature and humidity or dew fall for a long period. Also, care

must be taken not to give a shock to the instrument by dropping

or inadequate handling.

● Since the meter cover has been given an anti-static treatment

do not rub it strongly with a dry cloth. Where anti-static charges

are present on the meter window after it has been used for a

long period of time, causing the meter pointer to deflect in an

abnormal way, coat its surface with anti-static chemicals for

plastics or wipe it with a dilute solution of anti-static fluid as a

temporary measure.

● Understanding Some of the Basics in Electrical Testing Before

Using the Multimeter



● Auxiliary Units (Prefixes)

There are a number of measurement units used for multimeters.

Volt (V), ampere (A) and ohm (Ω) are most widely used as

measurement units to indicate electrical potential, current and

resistance. However, it is not always straitforward to handle these

units as they sometimes too large or too small for practical use or

calculation. Prefixes are therefore used as auxiliary units to simplify

the usage of such measurement units.

The following table shows some of the examples:

Auxiliary Unit M k m μ n P

Read mega- kilo- milli- micro- nano- pico-

Multiply 10610310-3 10-6 10-9 10-12

Example

2MΩ

＝

2000kΩ

2kΩ

＝

2000Ω

250mA

＝

0.25A

50μA

＝

0.05mA

200nF

＝

0.2μF

1000pF

＝

0.001μF

● Notes on Voltage & Current Measurements

It is important to understand the basic differences between current

and voltage measurements for proper use of multimeters.

Voltage measurements are designed to detect potential difference

between two points. Make certain that the multimeter is connected in

parallel with the circuit under test.

Current measurements are intended to monitor the consumption of

current in the circuit resulting from the application of voltage. Make

sure to connect the multimeter in series with the circuit under test.

Generally speaking, the internal resistance of a voltmeter should

preferably be larger, while that of an ammeter should be smaller. If

the multimeter is erroneously connected in parallel with a circuit for

current measurements, the likely result will be the flow of excessive

current and aubsequent damage to the fuses and other electronic

components. To avoid such a potential danger it is necessary to have

a good understanding of voltage and current measurements.



Voltage Measurements Current Measurements

(Parallel Connection) (Series Connection)

Measuring voltage at both ends

of a resistor.

Measuring current being

consumed by a resistor.

IM .......... Meter Current

IR .......... Load Current

E .......... Power Source Voltage

RM ........ Internal Resistance of Multimeter

Fig. 1

IR+IM IR> > IM

↓ ↓

・IR<<E

・IR

IRIR

Power

Source

Power

Source

E E

Load Load

RM= ∞

DC.V Range DC.mA Range

＋＋

−COM

＋

−−

RM= 0

Battery

(Power

Source)

Battery

(Power

Source)

Battery

(Power

Source)

Battery

(Power

Source)

Resistor

(Load)

Resistor

(Load)



2. Features

● Mirrored scale for easy and accurate reading.

● 19 measuring ranges for a wide scope of application.

● OUTPUT terminal to cut off the DC component of AC voltage being

measured.

● hFE scale for transistor checking.

● dB scale (

−

10 - +62dB).

● Safety designed input terminals and test leads.



3. Specifications

Functions Measuring Ranges Accuracy

DC Voltage

(7 ranges)

0-0.1 V

0-0.5V

0-2.5V

0-10V (20kΩ/V)

0-50V

0-250V

0-1000V

±3% of full scale

0-10V

AC Voltage

(4 ranges)

0-50V (9kΩ/V)

0-250V

0-1000V

±3% of full scale

DC Current

(4 ranges)

0-50μA

0-2.5mA

0-25mA

0-250mA

(

terminal voltage

)

approx. 100mV

(

terminal voltage

)

approx. 100mV

(

terminal voltage

)

approx. 150mV

(

terminal voltage

)

approx. 550mV

±3% of full scale

Resistance

(4 ranges)

0-2kΩ (20Ω mid-scale)

0-20kΩ (200Ω mid-scale)

0-2MΩ (20kΩ mid-scale)

0-20MΩ (200kΩ mid-scale)

±3% of scale length

Current across Terminals at

Resistance Range (LI)

(4 ranges)

0-150mA (x1 range)

0-15mA (x10 range)

0-150μA (x1k range)

±5% of scale length

(Battery voltage at 3V)

0-60μA (x10k range)

(Battery voltage at 12V)

Voltage across Terminals at

Resistance Ranges (LV)

(4 ranges)

0-3V (x1 , x10, x1 k ranges)

±5% of scale length

(Battery voltage at 3V)

0-12V (x10k)

(Battery voltage at 12 V)



Low Frequency

Output Using

OUTPUT Terminal

0-10V

0-50V

0-250V

0-1000V

Refer to frequency

characteristic chart

Low Frequency

Output (dB)

(4 ranges)

10V AC

−

10 - +22dB

50V AC +4 - +36dB

250V AC +18 - +50dB

1000V AC +30 - +62dB

(0 dB = 0.775V(1mW)

across a 600Ω line)

Refer to frequency

characteristic chart

DC Current Amplication

Factor (hFE) (1 range)

hFE: 0-1000 (atΩ× 10 range)

±3% of scale length

Dimensions: 100 (W) x 150 (L) x 47 (D)mm

Weight: Approx. 330g

Accessories: Test Leads (Model 7066A) - 1 set

F250V 0.5A fuse - 2 pcs. (including one spare fuse

also installed into the housing case)

1.5V Battery Type R-6P, SUM-3, AA or equivalent -

2 pcs.

(Installed into the instrument)

9V Battery Type 6F22, 006P PP3, or equivallent

- 1 pce (installed into the instrument)

Instruction Manual - 1 copy



4. Instrument Layout

①Meter Pointer ②Meter Zero Adjust Screw

③OUTPUT Terminal ④ +(P) Terminal

⑤-COM (N) Terminal ⑥ Front Panel

⑦Mirrored Scale Plate ⑧Meter Window

⑨Housing Case ⑩Ohm Zero Adjust Knob

⑪Range Selector Switch

①

⑥

⑦

⑧

⑨

⑩

⑪

②

③

④

⑤

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