AM450e User Manual
AEMULUS
15
To prevent over-voltage or over-current damage to the device-under-test (DUT), several levels
of output protection, termed COMPLIANCE, is incorporated. Maximum specifiable compliance
depends on the voltage or current range at which the source channel is operating. The
specified compliance is valid for positive and negative values, regardless of the polarity
specified in the COMPLIANCE field. For example, specifying a current compliance of 40mA, is
valid for +40mA and –40mA, output current more that ±40mA are not possible.
If a source channel reaches compliance during measurement, this indicates an error in the
operation. Example:
1.
AM450e is set to voltage source/current monitor mode; compliance of 1mA; output
load is a 1kohm resistor
2.
If source voltage is 5V, the current that should flow through the resistor is 5V/1k=5mA
3.
Due to compliance of 1mA, the source channel turns into a constant current source of
1mA. This yields a voltage of 1V across the resistor
The measurement result is the average value of all samples taken for n
th
number of power line
cycle (PLC). For example, if the line frequency is set to 50Hz (period is 20ms), then 1 PLC equals
to 20ms. The measured data is a resultant of averaged of raw samples captured by ADC on
AM450e for 20ms.
The NPLC setting of an instrument allows adjustment of the tradeoff
between speed and accuracy. The greater the number of power line
cycles, the greater noise rejection and better resolution the signal value
will be.
NOTE
