KYORITSU KEW 1109, KEW 1109S Instruction Manual

INSTRUCTION MANUAL

ANALOGUE MULTIMETER

KEW 1109S

Table of Contents

Page

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

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• 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 I

CEO

(leakage current of transistors) ......................... 22

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

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

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 1 

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1. Safety Warnings

The instrument must be used by a competent, trained p erson 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 meas ur in g a high voltage greater t ha n 250V (in s ma ll

powe r suppl y circu it a nd no t on pow er tr ansmissi on li ne),
connect the test leads to the circuit under test after it is once
de-energiz ed. 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 rang e

se l e c t or sw itch errone o u s l y se t to one of the curren t or
resistance range positions. The fuse may not protect the circuit.

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 2 

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● Never use the instrument in an explosive atmosphere especially

when making current measurements.

#

CAUTION

● Before makin g mea surements check that the range selec tor

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 exp o se the ins t r ument to the di r e ct sun, ext r eme

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

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 3 

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● Auxiliary Units (Prefixes)
There are a number of measurement units used for multimeters.
Vol t (V), am p e r e (A) an d ohm (Ω ) are mo s t widely us e d as

meas ure ment un its to indi cat e electri cal p otent ial , current a nd
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 10

6

10

3

10

-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.

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Voltage Measurements Current Measurements

(Parallel Connection) (Series Connection)

Measuring voltage at both ends
of a resistor.

M e a su r in g c u r r e n t b ei ng
consumed by a resistor.

I

M

.......... Meter Current

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

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

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

Fig. 1

IR+I

M  IR

> > I

M

↓ ↓

R

M・IR

< < E

R

M・IR

I

M

I

R

I

R

Power
Source

Power
Source

E E
Load Load

R

M

= ∞

DC.V Range DC.mA Range

＋

＋

−COM

−COM

＋

−

−

RM = 0

V

mA

mA

Battery
(Power
Source)

Battery
(Power
Source)

Battery
(Power
Source)

Battery
(Power
Source)

Resistor

(Load)

Resistor

(Load)

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 5 

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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.

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 6 

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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)

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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

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 8 

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4. Instrument Layout

①

Meter Pointer

②

Meter Zero Adjust Screw

③

OUTPUT Terminal

④

+(P) Terminal

⑤

-COM (N) Terminal

⑥

Front Panel

⑦

Mirrored Scale Plate

⑧

Meter Window

⑨

Housing Case

⑩

Ohm Zero Adjust Knob

⑪

Range Selector Switch

①

⑥

⑦
⑧

⑨

⑩

⑪

②

③

④

⑤

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5. How to Read Scales

Measuring
Ranges

Scales

H o w t o
Read
Scales

input
Terminals

DC Voltage
(7 ranges)

0.1V

0.5V

2.5V
10V
50V
250V
1000V

B 10
B50
B 250
B 10
B50
B250
B10

X0.01
X0.01
X0.01
X1
X1
X1
X100

+&

−

COM

AC Voltage
(4 ranges)

10V
50V
250V
1000V

C10

B50
B250
B10

X1
X1
X1
X100

+&

−

COM

DC Current
(4 ranges)

50μA

2.5mA
25mA
250mA

B50
B250
B250
B250

X 1
X0.01
X0.1
X1

+&

−

COM

Resistance
(4 ranges)

X1Ω
x10Ω
x1kΩ
X10kΩ

A 0-2k
A0-2k
A0-2k
A0-2k

X1
X10

X1k
X10k

+&

−

COM

Current
across
Terminals
(LI)(4 ranges)

X1Ω
X10Ω
X1kΩ
X10kΩ

E15
E15
E15
E15

X10(mA)
X1(mA)
X 10(μA)
X 4(μA)

+&−COM

Voltage
across
Terminals
(LV)(4 ranges)

x1Ω
X10Ω
X1kΩ
X10kΩ

F3
F3
F3
F3

X1(V)
X1(V)
X1(V)
X4(V)

+&−COM