Supply Voltage
230 VAC 50/60 Hz +10%/-15%
115 VAC 50/60 Hz +10%/-15%
12 VDC (External Battery option)
Power Consumption
0.7 W (typical figure on standard model..single load cell fitted)
The Micro 4000 is supplied as standard for use on a 230 VAC 50/60 Hz supply. Conversion to 115 VAC
50/60 Hz is easily accomplished by simple link changes on the main circuit board. The optional battery
facility allows the Micro 4000 to be connected to an external 12 VDC battery, this optional facility offers
monitoring of the battery supply with auto-power off should the battery supply become inadequate. An
adjustable auto-power off timer is also available to extend battery life when the Micro 4000 is not used for
a set period of time. The auto-power off timer can be set-up using spec 26 + 27 when in the service mode
of the Micro 4000.
Protection against ESD and power supply spiking
The Micro 4000 has an internal mains filter to reduce the affects of interference on the supply line and to
minimise the all to common mains ‘spiking’. To complement the protection of the internal electronics and
offer reliable operation a power monitor is also used to monitor the supply voltage. The power monitor
generates the correct microprocessor reset signal under normal switch on/off operations.
To protect the internal memory from any memory corruption and prevent adverse operation of the
microprocessor under excessive ESD or mains ‘spiking’ a reset signal is generated if the power monitor
detects excessive ESD or mains ‘spiking on the supply line. The microprocessor will be held in this reset
state until the condition clears. Once the condition has cleared the Micro 4000 will restart and begin the
normal switch on display cycle
230 VAC / 115 VAC conversion
Links 1,2,3 are used to set the supply voltage of the Micro 4000. These links are located above the mains
filter on the circuit board and should be fitted to suit the correct supply voltage.
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