Operating Procedure; Making Measurements With The Model Mr Probes; Dc Measurement - AEMC MR521 User Manual

AC/DC Current Probe Models MR411 & MR521

Operating Procedure

Making Measurements with the Models MR411 and MR521
 Plug the probe into the display device (e.g., DMM, logger). Note the
polarity of the probe output banana plugs (red = positive [+], black =
negative [-]).
 Select the appropriate range on the display device. Note that the
probe's outputs are 1mV/A and 10mV/A AC or DC. Note the maximum
current capability on 10mV/A range.
 Turn display device power on. Turn on the Model MR: the green LED
should be on, and the red LED off. If the green indicator does not
come on or goes off before the probe has operated for 10 minutes, it is
necessary to replace the battery (see "Battery Replacement," pg. 20).
 After approximately 10 minutes of operation, if none of the control
buttons has been manipulated power will automatically shut off (see
"Auto-Off" on next page).

DC Measurement

 Select the appropriate DC mV or V range on the DMM or measuring
instrument.
 "Zero" the probe. With the probe disconnected from test samples (no
conductor in probe jaw window), press the auto zero button. The red
LED (%) comes on for approximately three seconds to indicate that
the probe is zeroing. If the red LED remains lit, this indicates that zero
has not been attained - repeat the zeroing operation.
 For best accuracy, especially on low-level measurement, it is
recommended that you zero the probe before each measurement.
 Clamp the probe around the conductor to be tested. The DMM or
display device should now display the measured conductor current. A
positive reading indicates current flowing in the direction of the arrow
located on the side of the jaw. A negative reading indicates current
flow in the opposite direction of the arrow. Apply the conversion ratio
(1mV/A or 10mV/A) to get the value of the current.
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