SERIES
9900
9000
SERIES
GAUSSMETERS
SECTION III continued
Field Measurement Operations
III-H PEAK HOLD OPERATION
When the PEAK HOLD function is engaged (via the PEAK HOLD menu) the
largest absolute field reading will be held on the display. For instance a
+200.00 G reading will replace a +100.00 G reading and be held, and a
-250.00 G reading will replace the previously-held +200.00 G reading.
The user can reset a held reading at any time by pressing
and
releasing that
channel's RESET pushbutton on the front panel. As the pushbutton is
pressed the ''PEAK" annunciator will flash to indicate that the reset command
has been recognized but the actual reset operation will not occur until the
pushbutton is released.
One pushbutton is dedicated to resetting CHANNEL 1, another for
CHANNEL 2 and both for CHANNEL 3. In the case of a CHANNEL 3 reset,
the user might press one pushbutton before the other, say CHANNEL 1
before CHANNEL 2. In this case the CHANNEL 1 "PEAK" annunciator will
flash. As soon as the CHANNEL 2 pushbutton is pressed the CHANNEL 1
annunciator will return to normal and the CHANNEL 3 annunciator will flash.
This will not cause a problem since the actual resetting operation will not
occur until
both
pushbuttons are released, properly resetting CHANNEL 3's
peak reading only.
III-I POWER U P INITIALIZATION
The gaussmeter permanently stores each channel's MEASURE mode setup.
When the gaussmeter is powered off and on again, the previous settings are
restored and the gaussmeter is reinitialized to those settings. The following
information is saved:
• MODE (ac/dc AND GAUSS/TESLA)
• RANGE SETTING (INCLUDING AUTORANGE)
• PEAK HOLD ON/OFF (LAST PEAK READING WILL NOT BE SAVED)
• CLASSIFIER SETTINGS
• CLASSIFIER ON/OFF STATUS
• DIGITS ON/OFF
• BARGRAPH ON/OFF
• BACKLIGHT ON/OFF
• IEEE-488 PRIMARY ADDRESS
• RS-232 PARITY, STOP BITS, CHARACTER LENGTH AND BAUD RATE
The RELATIVE mode will be turned off and the relative offset will be reset to
zero.
III-J PROBE ORIENTATION VERSUS POLARITY
In the dc mode of operation the polarity of the reading versus the orientation
of the probe is depicted in Figure III-E. (Note the "F.W. BELL" logo is in an
upright, right-reading orientation.) As shown, the magnetic flux lines traveling
in the direction indicated by a "B" will result in a positive (+) polarity.
=
C
r
B
E
L
L
13
B
Figure III-E
Probe Orientation Versus Readout Polarity
C