INTRODUCTION

This Application Note describes the functionality of the
SA9607M and the SA9607P metering integrated circuits using
the PM9607AP evaluation module. The SA9607 family is a low
cost solution specifically designed to meet the needs of
markets that require both live and neutral energy
measurement, in order to detect possible meter tampering.
Using the SA9607 family the meter manufacturer is able to
build a meter that measures the energy consumption, even
during a tamper condition, and records it to a mechanical
counter.

This application note will focus on the practical use of the
SA9607 family. More detailed information specific to the
SA9607M or SA9607P can be found in the applicable
datasheet.

The SA9607 family is characterized by its ability to measure
live and neutral power consumption simultaneously. A
correctly installed meter should measure equal amounts of
power consumption in the live and neutral phases. During
meter tampering the two measurements are no longer equal.
The SA9607 will use the larger of the two currents for the
energy measurement. Differences of more than 12% between
the live and neutral power measurements are indicated on the
SA9607's ELT output which can drive a LED directly.

The SA9607 are designed to drive mechanical counters
directly. The module is fitted with an impulse type counter that
increments with a single 71ms pulse. The SA9607 can also
drive low cost mechanical counters (stepper motors) that use
two consecutive pulses with opposing voltages to advance the
counter one position. The SA9607 outputs these two opposing
pulses in close succession, minimizing the chance of the
stepper motor being in the wrong phase after a power failure.

Calibration pulses, reverse power, earth loop tamper and
active channel are displayed with four LEDs fitted on the
module.

Using the SA9607M, the rated conditions of the meter as well
as the LED pulse rate and counter resolution can be selected
for a particular meter design. The meter manufacture is thus
able to produce a range of meters utilizing the same counter
and the same metering constant with a single integrated
circuit. Calibration of the meter is done with trim-pots or
resistor ladders. Table 1 gives a short list of all the possible

THE SA9607 SERIES ENERGY METER ICS

THE SA9607M PIN PROGRAMMABLE MONOCHIP

METER

sames

Application Note:

Energy Meter Evaluation Module

PM9607AP

meter configurations possible with the SA9607M using the
PM9607AP module. Note that the values of the current
transformer's resistor values need to change to make some of
the rated conditions possible. This will be covered in the
Analog Section.

Table 1: A summary of the pin settings possible with the

SA9607M. Pin status 0 indicates connects to VSS and 1

indicates connection to VDD

THE SA9607P MONOCHIP METER WITH ON CHIP

CALIBRATION

The SA9607P uses an external EEPROM to store calibration
data as well as meter specific settings. A major advantage of
the SA9607P is that no external trim-pots or resistor ladders
are required to calibrate the meter. This greatly enhances the
meter reliability and can improve meter production times if
used in an automatic meter calibration system.

The SA9607P integrated circuit together with an external
EEPROM provides more meter setup features than the
SA9607M. Additional information regarding the meter (serial
numbers, client, and manufacture date) can also be stored in
the unused sections of the EEPROM memory. An IIC bus
based EEPROM is used to store configuration and meter
setup data for the SA9607P. The SA9607P will load this data
from the EEPROM during power up. During normal meter
operation it reloads periodically the data from the EEPROM.
The SA9607P never writes to the EEPROM. For more specific
configuration information please refer to the SA9607P
datasheet.

1/16

Setting
20A / 230V
40A / 230V
60A / 230V
1 pulse / kWh
10 pulse / kWh
100 pulse / kWh

Pin Status
RATED = 0
RATED = Open
RATED = 1
MP1 = 0, MP0 = 0
MP1 = 0, MP0 = 1
MP1 = 1, MP0 = 0

SPEC-0045 (REV. 1)

19-06-00

sames

PM9607AP

2/16

The PM9607AP module connects directly to live and neutral on
CON1. The module is referenced to neutral and should be kept
in mind when connecting test equipment to the module.

CON2 is used for in circuit programming of the EEPROM (U3)
when the SA9607P is used. The connector does not have any
significance when a SA9607M device is used in the module.

MAINS CONNECTION TO MODULE

Table 2: Connector Descriptions

SA9607M

Name

Con1

Con2

Function Description

SA9607P

Connector for the

220VAC power for

the module
Connector for

the opto isolator

module

Not used

VDD CNF SCL SDA FOUT DIRO VSS

1
2

Live

Neutral

1
2

Live

Neutral

Live

Neutral

Load

Figure 1: Connection diagram for normal metering application

SA9607M setting

Name

J9
J10

and

J11

Function Description

SA9607P setting

Connect pin 18 to DIR LED

Connect pin 17 to ELT LED

Connect pin 16 to SEL LED
Connect pin 13 to Calibration LED

Connect impulse counter to pin 12

Test pins are placed next to the digital pins of the SA9607

Connect one terminal of a Low Voltage stepper to pin 18, the

terminal of the stepper is always connected to pin 9.

Rated condition select jumper, pin 15

Motor pulse rate select jumper, pin 7

Motor pulse rate select jumper, pin 6

1/14

IIN1
IIP1
IIN2
IIP2
VREF
MP1/SCL
MP0/SDA
VDD
MON
OSC2

1
2
3
4
5
6
7
8
9
10

GND

IVP

DIRO

ELT

SEL1

RATED/CNF

VSS
LED

MOP

OSC1

29
19
18
17
16
15
14
13
12
11

J10

J11

+
+

Table 2: Jumper settings for various device options

MODULE SETUP

The PM9607AP module is setup for use with the SA9607M integrated circuit. Resistor values used on the module is calculated for
rated conditions of 60A/230V and the counter resolution pin programming is set for 100 pulses/kWh.

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USING THE SA9607P IC

The EEPROM on the SA9607AP module may be programmed in circuit with the use of a PC and a IIC interface module. The

interface module is available from SAMES and includes a IIC interface, a 7 way connector cable as well as all the components

needed to convert the module to a trim pot less meter. Figure 2 show how to connect the metering module, interface module as well

as the PC.

Figure 2: PM9607AP mains connections as well as PC programming setup

Live

Neutral

Load

sames

PM9607AP

3/16

To use the PM9607AP module with a SA9607P integrated

circuit the following components need to be changed:

n
n

Insert the EEPROM from socket U3.
Replace termination resistors R16 and R7 with 3.6

resistor.*
Remove Channel 2 trim-pot P1.*
Remove P2 trim-pot. Short-circuit the trim-pot footprint.*
Replace resistor R17 with a 24K resistor.*
Remove jumpers J5, J6 and J7.
Resistor R22 must be fitted if EEPROM will be

programmed in circuit.

* Component change is only require if the module should not

contain any trim-pots.

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MODULE OVERVIEW

ANALOG SECTION

The analog (metering) interface described in this section is
designed for measuring 230V/60A with precision better than
Class 1.

The most important external components for the SA9607
integrated circuit are the current sense resistors, the voltage
sense resistors and the bias setting resistor. The resistors used
in the metering section should be of the same type so
temperature effects are minimized.

Two current transformers are used to measure the current in
the live and neutral phases. The output of the current
transformer is terminated with a low impedance resistor. The
voltage drop across the termination resistor is converted to a
current that is fed to the differential current inputs of the
SA9607.

Current Input IIN1, IIP1, IIN2, IIP2

The termination resistor on the second current channel is
adjustable by means of P2 to facilitate channel equalization
calibration. The termination resistor is chosen so that a 10
trimpot in parallel will provide a sufficient channel range.

The resistors R8, R9 and R10, R11 define the current level into
the current sense inputs of the SA9607. The resistor values
are selected for an input current of 16�A on the current inputs
of the SA9607 at rated conditions. For a 60A meter at 2500:1
CT the resistor values are calculated as follows:

R8 = R9 = ( I / 16�A ) x R / 2

= 60A / 2500 / 16�A x 3.6 / 2
= 2.7k

I Line current
RSH = CT Termination resistor
2500 = CT ratio

The two current channels are identical so R8 = R9 = R10 =
R11.

The voltage input of the SA9607 (IVP) is driven with a current
of 14�A at nominal mains voltage. This voltage input saturates
at approximately 17�A. At a nominal voltage current of 14�A
allows for 20% overdriving. The mains voltage is divided with a
voltage divider to 14V that is fed to the voltage input pins via a
1M resistor.

The voltage divider is calculated for a voltage drop of 14V.
Equations for the voltage divider in figure 4 are:

RB = R1 + R2 + R3 + R4
RB = R6 || R5

Current Sensor Input Resistors

Voltage Input Ivp

Voltage Divider

sames

PM9607AP

3.6R

2.7k

Live Line

Neutral Line

Live Load

Neutral Load

10R

CT2

Phase 2

CT1

Phase 1

R10

2.7k

R11

2.7k

R16

6.2R

IIN1

GND

DR-01576

IIP1

IIN2

IIP2

4/16

Figure 3: Current input configuration

CT Termination Resistor
The voltage drop across the CT termination resistor at rated
current should be at least 20mV. The CTs have low phase shift
and a ratio of 1:2500. The CT is terminated with a 3.6 resistor
giving a voltage drop of 86.4mV across the termination resistor
at rated conditions (Imax for the meter).

120k

10R/2W

24k

R6
1M

Live

Neutral

DR-01577

GND

1u/16V

GND

IVP

TZ1

GND

Figure 4: Mains voltage divider

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5/16

Combining the two equations gives:

( RA + RB ) / 230V = RB / 14V

Values for resistors R4 = 10 , R5 = 24k and R6 = 1M is
chosen.
Substituting the values result in:

RB = 23.437k
RA = RB x ( 230V / 14V � 1 )
RA = 361.607k .

Standard resistor values of R1, R2, R3 and R4 are chosen to
be 120k , 120k , 120k and 10 .

The capacitor C4 is used to compensate for phase shift
between the voltage sense inputs and the current sense inputs
of the device, in cases where CTs with phase errors are used.
The phase shift caused by the CT may be corrected by
inserting a capacitor in the voltage divider circuit. To
compensate for a phase shift of 0.18 degrees the capacitor
value is calculated as follows:

C = 1 / (2 x x Mains frequency x R5 x tan (Phase shift angle))
C = 1 / ( 2 x x 50 x 1M tan (0.18 degrees ))
C = 1.013�F

The VREF pin of the SA9607 is connected to a resistor that
determines the on chip bias current. The PM9607AP module is
set up for the SA9607M, so the bias resistor is made up of
resistor R17 and trimpot P1 in series. The multi turn trimpot P1
may be varied for precise calibration.

Calibration of the bias current is not necessary when using the
SA9607P as device calibration is loaded from the external
EEPROM.

The GND pin of the SA9607 is connected to the neutral phase,
which is halfway between VDD and VSS. Note that supply
bypass capacitors C1 and C2 are positioned as close as
possible to the supply pins of the device, and connected to a
solid ground plane.

Reference Voltage VREF

Ground GND

sames

PM9607AP

Protection
A MOV together with R4 protects the transformer and the
voltage divider circuit against voltage transients.

Common mode and asymmetrical transients are attenuated
by the current setting resistors R8, R9 R10 and R11.

The PM9607AP module uses a transformer based power
supply to ensure flexibility for different counter drive
configurations. The maximum current that can be drawn by
the circuit is as follows:

The average power consumption of the module is usually less.
The current indicated in table 2 is worst-case peak pulse
current. The normal operating current of the module is closer
to 15mA. A 78LC05-voltage regulator is used to regulate the
voltage from the transformer. Two resistors R18 and R19
generate the analog ground voltage for the SA9607. The
SA9607 operates between 5 Volt and 0 Volt with its GND pin
connected to mid-rail.

POWER SUPPLY

Table 4: Maximum peak current drawn by components on

the module

Source
SA9607M/P IC
DIR LED
SEL1 LED
ELT LED
Pulse LED
Counter
GND ref
EEPROM
Total

Max current

5
5
5
5
5

3
2

Unit

mA
mA
mA
mA
mA
mA
mA
mA
mA

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6/16

sames

PM9607AP

IN CIRCUIT EEPROM CONFIGURATION

The EEPROM remains on the PCB and is reprogrammed via
the IIC bus.

Figure 6: Schematic diagram of the IIC opto-isolator module as well as relevant components on the PM9607AP module

4N35

SCL

DIRO

VDD

470R

SDA

VSS

470R

VSS

FOUT

R4
2.2k

TEST

VDD

VSS

680R

220R

680R

R10

220R

R8
680R

680R

PC VSS

SDI

FIN

SDO

SCK

O1A

ILQ74

O1B

ILQ74

O1C

ILQ74

O1D

ILQ74

4.7k

R11

10k

BC327

VSS

VDD

CNF

SCL

DIRO

SDA

LED

Pin 2

Pin 3

Pin 9

Pin 4

Pin 13

Pin 12

Pin 18..25

Pin 7..8

R21

R22

820R

SCL

VDD

SDA

On PM9607AP module

DR-01579

ore

cable

On Interface module

PC Printer Port

DIRO

CNF

DR-01578

ISOLATED PC INTERFACE MODULE

OPERATION

The isolator module connects to a standard PC printer port by
means of an extender cable on the one side and to the
PM9607AP on the other side. The PC is completely isolated
form the evaluation module and can be used to program the
EEPROM on the PM9607AP module safely.

The SA9607P is designed to be the bus master and does not
support multi master mode. Resistor R22 is used to overdrive
the clock signal of the SA9607P during programming.

Table 5: Pin description of the CAL connector

Figure 5: Wave forms describing the configuration trigger

1
2

3
4
5
6

Function
Positive supply
A positive edge on CNF with DIRO high will
trigger a configuration reload
Serial data pin
Serial clock pin
LED pin of device
DIRO need to be high before CNF is pulsed
to trigger a reload
Negative supply voltage

Name

VDD
CNF

SDA
SCK

FOUT

DIRO

VSS

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sames

PM9607AP

Figure 7: Screen capture of the SA9607P setup program

CALIBRATION AND SETUP

Software is available to setup and calibrate the SA9607P
device. Download the SA9607P1.zip file from the SAMES web
site. From the following URL:

The latest version of the evaluation software and source code
is included in the zip file. The software was written with Borland
C++ Ver 3 and should run on any PC with DOS operating
system. The program was written as clear as possible so that it
can easily be modified for specific needs.

Start the program from the DOS prompt with:

Use the cursor keys to move up and down between the
parameters listed under the "SA9607P Meter Parameters"
section. Press Enter on the parameter that needs to be
changed. The options available will be displayed. Type in the
correct option or value and press Enter again. The new setting
will be displayed.

A detailed description of the parameters listed on the screen
are described in the SA9607P datasheet. The following is a
description of the functionality of the SA9607P Meter
Parameters, displayed on the PC's screen, figure 7.

http://www.sames.co.za/emsoft/9607-1.zip

c:\>sa9607p 1 1000

NAVIGATING

V and I

LED Constant

Counter Resol.

Counter PW

Channel1 Err / Channel2 Err

nom

ma x

and I

make up the rated conditions of the module

(SA9607P's Kr parameter). V is the module's rated voltage

and I the module's rated current. The PM9607AP module is

designed for rated conditions of 230V/60A. The software

defaults to V = 230V and I = 60A.

LED Constant selects the module's LED pulse rate (calibration
LED), which is the SA9607P's CLED parameter. The options
available are 6400 p/kWh or 3200 p/kWh. Entering a `0' will
enable the 1252 pulses/second (at rated conditions) mode for
fast calibration.

Counter resolution sets the modules counter resolution
(SA9607P's CRES parameter). The options are 1,10 or
100p/kWh.

Counter PW set up the mechanical counter's pulse width
(SA9607P's CPW parameter). The available options are 71ms
and 142 ms. The PM9607AP module uses an impulse counter
with a pulse width of 71ms.

The module may be calibrated by entering the percentage
error in relation to a calibrated meter or Wh-Standard. The
percentage error is calculated as follows:

Error=(Energy from module � Real energy)/Real energy x 100

nom

ma x

nom

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8/16

sames

PM9607AP

For module calibration use Channel Sel. (below) to switch to
one of the two channel permanently. Calibrate the channel and
switch to the next channel. Calibrate the channel and set
Channel Sel to automatic for normal meter operation. This is
equal to the SA9607P's Kc parameter, which is used for
channel balance.

The channel select parameter selects the source for energy
metering. (SA9607P's CS parameter). The options are `0' for
automatic, `1' for channel 1 and `2' for channel 2.

The modules earth leakage compensation value is set up with
this parameter. (SA9607P's Ne parameter). The options are `0'
for a factor of 0.15, `1' for a factor of 0.076 and `2' for a factor of
0.032.

The memory map, as calculated from the settings in the
program, is listed by pressing "l". It does not show the content
of the EEPROM.

Pressing "w" writes to the EEPROM. The EEPROM on the
PM9607AP module will be updated with settings specified by
the program.

Pressing "t" triggers a reload. The SA9607P is triggered and
reloads the parameters from the EEPROM. The SA9607P will
reload the parameters every 1132 seconds.

The contents of the EEPROM is displayed by pressing "r".

The program is exited by pressing "q".

Channel Sel.

Earth Leak

LIST MEMORY

WRITE TO EEPROM

DEVICE RELOAD TRIGGER

READ FROM EEPROM

QUIT THE PROGRAM

PCB DESIGN

The module represents a Class 1 meter and is designed to
demonstrate the functionality and performance of both the
SA9607M and the SA9607P single phase metering circuits.
The SA9607M requires external settings and gain adjustment.
The SA9607P allows for complete digital calibration without
any external adjustments. The board can be configured for
either of the two ICs by means of jumper settings.

The module is a demonstration unit as well as a reference point
for the meter manufacturer. All the digital pins of the device
have at least one test point. Jumpers isolate LED's and
counters from the device

The groundplane, which is connected to neutral, protects the
device from external noise and is used to connect the power
supply bypass capacitors C1 and C2. On the current input
resistors and the CT termination resistor loops are introduced
to cancel out the signal induced by the transformers magnetic
field.

The 5V supply is de-coupled and routed directly to the power
pins of the IC. P2 is connected with a separate track to the VSS
pin of the SA9607.

GROUND PLANE

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PM9607AP

9/16

COMPONENT LISTS

The following component list covers all components fitted on the PM9607AP module as shipped and configured for the SA9607M
device.

Table 6: Components for SA9607M functionality, 60A rated setup

Symbol

Description

Detail

SA9607M
78C05, Voltage regulator

Diode, Silicon, 1N4148
Resistor, 120k, 1/4W, 1%, metal

Resistor, 10R, 2W, Wire wound

Resistor, 24k, 1/4W, 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 3.6R, 1/4W, 1%, metal

Resistor, 6.2R, 1/4W, 1%, metal

Resistor, 22k, 1/4W, 1%, metal
Resistor, 2.7k, 1/4W, 1%, metal
Resistor, 22k, 1/4W, 1%, metal
Resistor, 680R, 1/4W, 1%, metal
Resistor, 1k, 1/4W, 1%, metal

Capacitor, 220nF

Capacitor, 1uF, 16V, electrolytic

Capacitor, 2200uF, 16V, electrolytic

Capacitor, 220uF, 16V, electrolytic

3mm Light emitting diode

Transformer, 230V/9V, 1.5VA

S20K275

Impulse counter, Kuebler, K07.80

Molex 3 pin connector, 200 mil pin spacing

Molex 7 pin connector, 100 mil pin spacing

Current Transformer, TZ-76, PCB Mount

Jumpers

Header pins
Crystal, 3.5795 Mhz

IC2
D1, D2, D3, D4

R1, R2, R3

DIP-20

0R for SA9607M

R5
R6

R7
R16

R17
R8, R9, R10, R11
R12, R13, R14, R15

R18, R19
R20, R21

R22

C1, C2
C3

C6
LED1, LED2, LED3, LED4
T1
TZ1
CNT1

Con1
Con2

CT1, CT2

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PM9607AP

10/16

Symbol

Description

Detail

SA9607P
24C01A, IIC bus interfaced EEPROM

Resistor, 22k, 1/4W, 1%, metal

Resistor, 3.6R, 1/4W, 1%, metal

Resistor, 24k, 1/4W, 1%, metal

Resistor, 4.7k, 1/4W, 1%, metal
Resistor, 1.6k, 1/4W, 1%, metal
Multi-turn trim pot, 10R

Multi-turn trim pot, 5k

IC3
R7, R16

R17

DIP-20
Insert
Insert
Remove
Insert
Optional
Insert
Remove
Link

R17

R20, R21
R22

P1
P2

The following component list covers components that need to be changed to use the module with the SA9607P device.

Table 7: Components for SA9607P functionality, 60A rated setup

Table 8: Interface Module components

Symbol

Description

Detail

ILQ74
4N35

Resistor, 470R, 1/4W, 1%, metal

Resistor, 4.7k, 1/4W, 1%, metal

Resistor, 680R, 1/4W, 1%, metal

Resistor, 220R, 1/4W, 1%, metal
Resistor, 10K, 1/4W, 1%, metal
Transistor, BC327

Molex 7 pin connector, 100 mil pin spacing
Molex 2 pin connector, 100 mil pin spacing

DB25 PCB Mount, Female connector
Header pins

O2, O3
R1

R2, R3

DIP-16
DIP-16

T0, 92, PNP

External 5V supply

R5, R7

R8, R9, R6, R10
R11

Q1
JP1

J1
SK2
6

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15/16

sames

PM9607AP

C1 220n

C2 220n

120k

10R

/
2
W

R5 24k

R6 1M

R7 3.

C3 820n

VSS

5795M

UTRA

CNT1

L
V

epper

LED

SEL

680R

10R

LED

680R

LED

680R

LED

680R

Phas

CT1

CT2

Phas

R1 22k

VSS

14V

1 2

i
n
s

14V

C4 1u/

1
6V

2200u/

16V

230/

Vin

GND

Vout

U2 7805

D1 1N

4148

D2 1N

4148

D3 1N

4148

D4 1N

4148

C6 220u/

16V

1 2 3 4

A0 A1 A2 VSS

8 7 6 5

24C

0
1A

CNT2

o
unt

VSS

PPD

VPD

FMO

SEL

LED

J8 ML

VSS

1
5

J9 SL

1 2 3 4 5 6 7 8

CNF

TZ1 TZ

VSS

FMO

L_2

OSC

VSS

CNF

PPD

VPD

OSC

1 2 3 4 5

OSC

1 2 3 4 5 6 7

CNF SC

VSS

L_2

VSS

IIP

0
/
S

1
/
S

OSC

IIN

IIP

IIN

SEL1

CNF

VSS

LED

OSC

SA9607M

/
P

Dr-01581

Figure 11: Schematic diagram of the complete PM9607AP module

sames

PM9607AP

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sames

PM9607AP

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PM9607AP

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DISCLAIMER:

The information contained in this document is confidential and proprietary to South African Micro-Electronic Systems (Pty) Ltd
("SAMES") and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES.
The information contained herein is current as of the date of publication; however, delivery of this document shall not under any
circumstances create any implication that the information contained herein is correct as of any time subsequent to such date.
SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and
SAMES expressly reserves the right to make changes in such information, without notification, even if such changes would render
information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by
reference to the information contained herein, will function without errors and as intended by the designer.

Any sales or technical questions may be posted to our e-mail address below:

For the latest updates on datasheets, please visit our web site:

(012) 333-6021

+27 12 333-6021

(012) 333-8071

+27 12 333-807

energy@sames.co.za

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SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS

DIVISION OF LABAT TECHNOLOGIES (PTY) LTD

Tel:

Tel: Int

Fax:

Fax: Int

P O BOX 15888

33 ELAND STREET

LYNN EAST 0039

REPUBLIC OF SOUTH AFRICA

33 ELAND STREET

KOEDOESPOORT INDUSTRIAL AREA

PRETORIA

REPUBLIC OF SOUTH AFRICA

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Электронный компонент: PM9607AP