ETS-Lindgren HI-3627 ELF Magnetic Field Meter - Manual (Page 15)

HI-3627 Manual Page --7
Figure 3-2
ranges for measurement. The scales are arranged so that when
the meter is first turned on, the meter will be on it's least
sensitive scale, ie. highest range. As the switch is rotated
clockwise the sensitivity of the meter increases. Generally
speaking, the readings will be most accurate when the meter
movement has maximum deflection without an over range
indication. A second toggle switch controls the desired low
frequency cutoff. The user may select the lower frequency of
the band pass for the instrument as either 30 Hz or 5 Hz.
There are two LED indicators on the front panel. A "Low
Battery" LED lights when the battery voltage is too low for
accurate readings. After lighting, the batteries will provide about
10 minutes of useful operation. The "Over Range" LED
illuminates when the field being measured exceeds the range
selected on the HI-3627.
Recorder Output
The HI-3627 Magnetic Field Meter has a recorder output. The
recorder output is a voltage signal (0-5 VDC) proportional to the
needle deflection on the meter. This output can be used to drive
a chart recorder, data logger, or other device to display the
indicated field reading on the instrument.