3
Introduction
The 37XR is a true rms autoranging handheld digital multimeter for measuring or
testing the following:
• DC and AC voltage • Capacitance
• DC and AC current • Diodes
• Resistance • Continuity
• Inductance • dBm
• Frequency • Logic Levels, TTL or CMOS
• Dutycycle
Additional features include: MIN MAX AVG, HOLD, REL, PEAK±, Backlight, and
Range Lock
Making Measurements
Verify Instrument Operation
Before attempting to make a measurement, verify that the instrument is operational
and the battery is good. If the instrument is not operational, have it repaired before
attempting to make a measurement.
Range Selection
In addition to autoranging the 37XR allows you to manually select and lock a range
by pressing the RANGE button. RANGE appears on the display to indicate that
manual ranging is active. Each subsequent press of the range button steps the
meter to the next higher range. When the highest range is reached the next press
returns the meter to the lowest range. To return to autoranging press and hold the
RANGE button for 2 seconds. RANGE no longer shows on the display.
Use autorange for all initial measurements. Then, when appropriate, use the RANGE
button to select and lock a range.
Warning
To avoid electrical shock while manual ranging use the display
annunciators to identify the actual range selected.
Correcting an Overload (
o
or
-
o
) Indication
W
An
o
or
-
o
indication may appear on the display to indicate that an overload
condition exists. For voltage and current measurements, an overload should be
immediately corrected by selecting a higher range. If the highest range setting does
not eliminate the overload, interrupt the measurement until the problem is identified
and eliminated. The
o
indication is normal for some functions; for example,
resistance, continuity, and diode test.
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