Measuring The External Target Vcc Voltage - Equinox Systems ISPnano I Series User Manual

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Datasheet of ISPNANO S3 KIT - ISP PORTABLE PROGRAMMER
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4.5.5 Measuring the External Target Vcc Voltage

The panel which controls the switching on/off of the 'External Target Vcc' voltage is shown below....
Instructions:
Ensure that the 'EXTERNAL VCC OUTPUT Voltage' is switched OFF at the supply.
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Disconnect any cables connected to the 'Target ISP Connector'. This will prevent accidental
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damage in case of a wiring error!
Click the <Measure V/I> button to display the voltage measured....
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Both the 'External Target' INPUT and OUTPUT voltages should read 0.0V.
Switch the 'External Target Vcc' supply ON (by manually switching on the external power
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supply).
Click the <Measure V/I> button to display the voltage measured....
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The programmer now measures 24.0V on the 'External Target Vcc' input but 0.0V on the output
as the External Target Vcc switch' is OFF.
Click the <Power up..> button to switch the 'External Target Vcc switch' ON.
The 'BUSY' LED on the programmer will illuminate.
The 'External Target Vcc switch' is switched ON and so 24.0V should be measured at both input
and the EXT-VCC-OUT output (pins 3+4 of the 'Target ISP Port').