LS SERIES SERVICE MANUAL
ISSUE 4.0 EXTENSION MEASURING SYSTEM 2
An /E Series ANALOGUE External Extensometer is supplied with an extensometer plug which
contains an 04/1408 extensometer amplifier/connector PCB. Other series of extensometers may
be converted by using an adapter kit 07/2053/S that consists of an 04/1408 extensometer PCB and
a metal 25 way D housing. See diagnostic section 11 for details.
The extensometer PCB contains a link between pins 14 and 15, which connects a ground signal
to the Main PCB to indicate that an extensometer is connected to the machine. The
extensometer PCB contains a low drift DC amplifier circuit consisting of IC1 and IC3. The
amplifier can be configured to provide gains from X0.5 to X2000 by fitting "links" and selecting a
resistor value. See diagnostic section 11 for details.
The extensometer factor and the calibration information is stored in a pre-programmed
EEPROM IC2 which is automatically read from the SDA (Serial Data) output of the EEPROM
(pin 9) when the extensometer is connected, i.e. each extensometer is self identifying.
The amplifier output is in the range of +10V to -10V and is fed to the main PCB via pin 7 of the 25
pin D plug. This signal is connected to the multiplexer IC3 via the adaptor cable or extensometer
interface box. Note that a Tension test requires a +ve going signal but this signal does not have to
start from 0V but can be, for example, 0V increasing to +10V or -5V increasing to +5V etc.
5.3 Analogue to Digital Converter
The extensometer signal is converted into 16 bit data by the ADC IC6 via the multiplexer IC3.
Details of the multiplexer and ADC are shown in the Load Measurement section.
5.4 External Encoder Extensometer
A single /E Series ENCODER External Extensometer (e.g. single encoder or twin/differential
encoders) can be connected to the machine by using an adaptor cable, part number 09/1047.
One or two /E Series ANALOGUE External Extensometers together with a single /E Series
DIGITAL external extensometer (encoder - single or twin/differential) can be connected
simultaneously to the machine by using an extensometer interface box, part number 01/3095.
Note that only ONE ENCODER External Extensometer can be connected and used.
An /E Series ENCODER External Extensometer is supplied with an extensometer plug which
contains an 04/1408 extensometer amplifier/connector PCB. Other series of extensometers may
be converted by using an adapter kit 07/2053/S that consists of an 04/1408 extensometer PCB and
a metal 25 way D housing. See diagnostic section 11.6 for details.
The extensometer PCB contains a link between pins 14 and 15, which connects a ground signal
to the Main PCB to indicate that an extensometer is connected to the machine. The
extensometer factor is stored in a pre-programmed EEPROM IC2, which is automatically read
from the SDA (Serial Data) output of the EEPROM (pin 9) when the extensometer is connected,
i.e. each extensometer is self identifying.
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