KYORITSU KEW 1109 User manual

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

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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.

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● 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

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● 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.

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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
↓ ↓
RM
・IR<<E
RM
・IR
IM
IRIR
Power
Source
Power
Source
E E
Load Load
RM= ∞
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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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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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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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