AC/DC Current Probe Models MR461 and MR561
15
4.1.2 AC Measurement
• Select the AC position range on the oscilloscope.
• The DC zero adjustment is not required when measuring AC cur-
rent.
• Clamp the probe around the conductor to be tested. The oscillo-
scope should now display the measured conductor current. Apply
the conversion ratio (1mV/A or 10mV/A) times the V/Division
range on your oscilloscope to get the value of the peak current.
4.1.3 Indicator Lights: Green LED
• The green LED indicates that the probe is on and that the battery
is good. The green LED will not light under low battery conditions.
Replace the 9V battery if the green LED is not lit.
• The red LED indicates a momentary or continuous overload of
the instrument. Readings taken while the red LED is on or flash-
ing should be considered inaccurate. Momentary or continuous
currents exceeding 60A peak on the 60A range or 600A peak on
the 600A range for the Model MR461, and 150A peak on the 150A
range or 1500A on the 1500A range for the Model MR561 will trig-
ger the red LED.
4.1.4 Making Measurements with the Banana/BNC
Connector
• The probes may be used with a DMM with the use of a Banana/
BNC Connector (Cat. #2111.32).
• 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 maxi-
mum 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 min-
utes, it is necessary to replace the battery.
• After approximately 10 minutes of operation, if none of the control
buttons have been manipulated, power will automatically shut off.
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