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will be approximately three hours of continuous measurement
for new cells. Continuous measurement is very unlikely, and
high current is only drawn when test probes are connected
and touching a low-resistance surface. It is expected that in
most foreseeable conditions, one set of batteries will allow at
least eight hours of normal intermittent testing activity.
CAUTION
THIS INSTRUMENT IS TO BE OPERATED FROM BATTERY
POWER ONLY. CONNECTION OF AN EXTERNAL SUPPLY WILL
RESULT IN A HAZARDOUS CONDITION AND MAY DAMAGE
THE R1L-E2A
Front Panel Controls and Displays (Refer to figure 1)
POWER ON/OFF pushbutton switch turns battery power ON
and OFF for the R1L-E2A. It is protected by a ring to make
accidental actuation more difficult.
The
RANGE switch is used to select the desired resistance
range for the resistance under test. There are five ranges
marked 2 mΩ, 20 mΩ, 200 mΩ, 2 Ω, and 20 Ω. Note that
although the ranges are marked “2" etc., the actual reading
limit is 1.999 mΩ, etc. Resistance readings on any range
exceeding 1999 (with appropriate decimal point) show as an
“over-range” condition, indicated by a display of “1” followed
by three blanks.
BACKLIGHT pushbutton is a momentary pushbutton switch
which controls PC board circuitry to cycle through three states
for the backlight. The default state is OFF, which occurs each
time the R1L-E2A is powered up, regardless of previous
history, and is indicated by the full black circle. Depressing the
pushbutton once causes the backlight to cycle to its half-bright
state indicated by the half-lighted circle. Depressing the
switch a second time causes the backlight to cycle to its full-
bright state, indicated by the non-filled circle. A third
depression of the backlight switch will cycle the backlight to
OFF.
DISPLAY is a 3½ digit LCD with decimal points, reading from
0.001 mΩ to 19.99 Ω full scale.
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