ETS-Lindgren HI-1710 Microwave Measurement System (Archived) - Manual (Page 22)

HI n 1710 Manual Page — 17
up to normal operating temperature. There will also be
small variations as the ambient temperature changes
during the day. For these reasons, the zero point of the
instrument must be reset periodically.
In addition, the bias and offset readings are checked
against preset internal limits each time the zero switch is
activated. If the limits are exceeded, an error message is
displayed. Zeroing the instrument in a sufficiently high
RF field or zeroing the instrument with the probe removed
will also cause an error. These tests measure the
performance characteristics of the probe and serve as
failure indicators.
Over Range
If the unfiltered RF signal from the probe exceeds 20
mW/cm
2 or the filtered RF signal exceeds 10 mW/cm 2 ,
the over range indicator will turn on. The over range
indication is latched to indicate that a signal has
exceeded the measuring capabilities of the system. The
over range condition is reset when the instrument is re-
zeroed.
Shift Functions
Several additional performance indicators and settings are
available at the front panel through the use of shifted
touch switches. To indicate a shifted function, press and
hold the zero switch while activating one of the shifted
switches. Note that some shifted switches are not
marked on the front panel.
Bias (shift ALARM SET Increase [ v ]) - Displays the
probe bias reading. This value should be between
0.300 and 0.4.00 volts.
Archived 4/2/10