ETS-Lindgren HI-1710 Microwave Measurement System (Archived) - Manual (Page 21)

Page — 16 HI n 1710 Manual
In the normal (non-PEAK HOLD) mode, the Bar Graph
display follows the filtered display reading.
Alarm Set
The HI-1710 has an audible alarm feature to indicate that
the measured leakage has exceeded a preset level. The
Alarm Set function is controlled by two front panel touch
switches. The upper switch raises the set point and the
lower switch lowers the set point.
Pressing either switch momentarily displays the current
alarm set point on the digital display as well as causing
the Bar Graph to display the alarm set point as a
percentage of the current range setting.
If either switch is pressed continuously, the alarm set
point will begin to increase or decrease depending on the
switch activated. The rate at which the set point
changes increases as the switch continues to be pressed.
To slow the change rate for precise settings, momentarily
release the switch and then activate again.
The alarm is set to the high end of the scale at the
factory. Note that the alarm will sound only when the
displayed RF value exceeds the alarm setting, e.g. if the
alarm is set at 4.99 mW/cm
2 , the alarm will only sound
when the displayed RF level is 5.00 or greater.
Zero
The zero switch subtracts the current offset reading from
the probe from the currently displayed RF reading. This,
in effect, subtracts a number from itself resulting in zero.
It is important to note there must be no RF present in the
vicinity of the probe when the zero switch is activated.
Doing so will cause an inaccurate zero. The zero will drift
as the instrument's electronic circuitry and diodes warm
Archived 4/2/10