4.4-12 Section 4: Using the Model 9100: AC Voltage Function
Final Width = 215mm
4.4.5.4 Low and High Voltage States (Contd.)
Transit Rules
Rules, built into firmware, govern transit across thresholds between the two states. The
'upper' threshold is active only when in LV state, whereas the 'lower' threshold operates
only when in HV state, as indicated in the figure.
Within certain limits, these boundaries can be repositioned in 'Config.' Mode (see paras
4.4.5.5) by adjusting the upper threshold value. This also changes the lower threshold,
which always remains at 90% of the upper threshold value, and cannot be altered
independently.
Increasing Output Voltage into High Voltage State
When increasing output value using any method; if the new value will be greater than the
upper threshold and OUTPUT is OFF, HV state will be activated but no effect will be
observed. If OUTPUT is ON, it will remain ON at its latest LV state value. The operator
will be prompted, by audible warning and error message, to confirm that HV State is
required. This is done by pressing the OUTPUT ON key again; then, after a short delay,
the output voltage will be raised to the new voltage in HV state.
While OUTPUT is ON in HV state, a distinctive, pulsing tone is emitted. Once in HV
state, OUTPUT can be turned ON and OFF with no need to confirm.
Decreasing Output Voltage out of High Voltage State
When decreasing output value using any method; if the new value will be less than the
lower limit of HV State, then the LV state will be activated. No warning will be given,
except that the pulsing tone will cease. This rule applies whether OUTPUT is OFF or ON.
Indication of Potentially Dangerous Output Voltages
When Output is ON and the set output voltage (including a deviation element) exceeds
32V, then the OUTPUT ON LED will flash (regardless of whether the voltage is in High
or Low Voltage State) to show that a potentially-dangerous voltage exists at the terminals.
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