5.1 Ge n e r a l 37
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Chapter 5: Advanced Operation
5.1 General
This chapter provides information on advanced operations for the
Model 425 gaussmeter.
5.2 The Alarm and
Relay Functions
The alarm function is commonly used to automate magnet testing and sorting in a
factory environment. To configure the alarm, choose between the magnitude or alge-
braic setting (section 5.2.2) then choose between an inside or outside setting
(section 5.2.3). To complete the alarm setup, enter your high and low alarm setpoints.
In addition to these steps, you can configure the alarm to work in a way that best suits
your working conditions. For instance, while the instrument will automatically dis-
play an annunciator (
ª) when the alarm function is turned on, you can also choose to
display a pass/fail message (section 5.2.4). Finally, the alarm can be configured to
work in conjunction with the relay (section 5.2.6), which can be connected to external
control equipment.
Menu navigation:
Alarm/RelayQ(off, on)
Default: off
Interface command: ALARM
5.2.1 Low and High
Alarm Setpoints
The alarm must be turned on in order to set the high and low alarm setpoints from the
front panel. When entered, the high and low alarm setpoint values will match the
field units in which the instrument is set. The range of values that can be entered are
limited to ±350 kG, independent of the probe that is attached. Refer to section 4.2.2
for numeric entry.
Menu navigation:
Alarm/RelayQ(on)Qlow alarm setpointQ high alarm setpoint
Default: 0
Interface command: ALARM
5.2.2 Magnitude and
Algebraic Parameter
The magnitude and algebraic parameter allows you to choose between testing for
magnitude only (magnitude setting), or for both magnitude and field polarity (alge-
braic setting).
With the magnitude setting, the instrument ignores the field polarity (or sign), and
instead only tests the magnitude of the field. This setting is used when orientation of
the magnet is not a factor for determining whether a magnet passes or fails a magnet
test.
With the algebraic setting, the instrument measures the magnitude of the field as
well as field polarity. For instance, you could use the algebraic setting if you test mag-
nets that are part of an assembly where both the orientation and magnitude are
important.
Menu navigation:
Alarm/Relay (press and hold for 3 s)Q(magnitude, algebraic)
Default: magnitude
Interface command: ALARM
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