40
Special Functions and Features
2.
Select the range by pressing the "SHIFT" key, followed by
"RANGE". If no input is present, the lowest range will be held.
The character "
Θ
" will appear on the display during any time
that a range is held.
3.
Repeatedly pressing the "SHIFT" and "RANGE" keys again in
sequence will cause the unit to change to the next highest range,
continuing until the highest range is reached.
4.
Pressing "SHIFT" and "RANGE" one more time will cause the
unit to go back to automatic range selection, where the cycle can
be repeated.
If there is an input signal present and a value is being displayed in a
particular range, the "SHIFT"/"RANGE" key sequence will cause
the present range to be held. It will be impossible to select or hold a
range lower than the one being used.
OVLD – Out of Range Indication
If a range is held, and the upper limit of the range is exceeded by
more than approximately 10%, the 918B will indicate an out-of-
range condition by displaying the message "OVLD!"
When the instrument is operated in one of the modes which utilize
both the voltage and the current inputs, and a voltage and/or current
range is held, the display will indicate when either of the inputs falls
below an acceptable level. The measurement modes, which are
subject to Out-of-Range, are volt-amps, volt-amps reactive, watts,
power factor, and phase angle.
Input Low
While in one of the above modes, if an input level falls below the
lower end of a held range, the display will begin to flash. If an input
value falls below 50% of the lower end value of a held range, the
display will read "Input Low".