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SERIES
9900
PROBE ZERO
INSERT THE PROBE IN THE
CHANNEL-1
CHANNEL-2
ZERO-GAUSS CHAMBER
CHANNEL-3
HELP
Press ENTER when ready.
MAIN MENU
RUN
9000
SERIES
GAUSSMETERS
SECTION I V continued
Menu Operation/Gaussmeter
Programming
Note that values generated by the PROBE ZERO and PROBE RELATIVE
functions are
NOT
saved or loaded. The present values
(if
any) remain in
effect. Also, if a loaded setup's range setting is inappropriate for the type of
probe presently installed, the next valid range will be selected automatically.
For example, if a setup contains a CHANNEL 1 range setting of 3 G, and that
setup is loaded in with a 10X probe connected to CHANNEL 1, the 30 G
range will be selected (3 G is not a valid range selection with a 10X probe.)
SETUP SAVE—LORD
REVIEW
SAVE
LORD
HELP
MAIN MENU
RUN
IV-I PROBE ZERO
E F I R G R A P H E E E M D I M I T S E M A N
R N E E t E D O M M O D . E 7 8 0 1
Iffi-13E.ES matFle3.14sms
B R E G R A P H W E E D I M I T S C I M M
R N S E : 3 0 0 W W . E 7 E R
M11-138.1215 E 1 2 3 . 4 S N E
B R R E R S P H M A E E D I S I T S M A L I M
R N G E : 3 0 0 M E N V I . E 7 E R
M
M
1
4
-1
3
E
.B
E
M
1E3.4M
Figure IV-G
SETUP SAVE-LOAD Menu
R AT E ]
P E R K
R I A T 0 -
P E R K
R A T D -
P E R K
There are many factors that can affect the initial accuracy of a field reading.
Probe offsets, circuit offsets and proximity to ferrous metals and
electromagnetic fields (including the earth's) can result in field readings that
are something other than zero when they should be zero.
The front panel of the gaussmeter contains a ZERO GAUSS CHAMBER
which shields the probe from surrounding fields, leaving only errors due to
probe and circuit offsets. With the probe placed in the zero gauss chamber,
these errors can be removed by "zeroing" the probe. Unlike most other
MENU operations, the PROBE ZERO function requires the presence of an
interface module and a probe. The probe is zeroed only for the mode (ac or
dc) that is presently programmed for the channel (via the MODE SELECTION
MENU).
Figure IV-H
PROBE ZERO Menu
Once a channel is selected from the menu, a message will appear that states
that the gaussmeter is ready to begin. Pressing the ENTER pushbutton
initiates the zeroing process. (If the channel's interface module and probe are
not present, an error message will appear instead. In this case, pressing the
ENTER pushbutton will abort the zeroing operation.)
In the ac mode, the gaussmeter starts at the lowest valid range and zeroes
the probe through each valid range. At each ac range, a digital correction
factor is generated and stored.
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