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AC/DC Current Probe Models MR461 and MR561
CHAPTER 4
OPERATION
4.1
Making Measurements
• Connect the current probe to the proper input channel on the oscil-
loscope.
• Begin with the least sensitive range on the current probe (1mV/A).
• Select the 0.5V/Division on your oscilloscope.
• Turn oscilloscope power on. Turn on the Model MR461/561. The
green LED should be on, the red LED should be off. If the green
indicator does not come on or goes off before the probe has oper-
ated for 10 minutes, it is necessary to replace the battery.
• After approximately 10 minutes of operation, if none of the con-
trol buttons have been manipulated, power will automatically shut
off.
4.1.1 DC Measurement
• Select DC position on the oscilloscope.
• “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. Alternatively, you may “zero” with the oscilloscope.
• For best accuracy, especially on low-level measurement, it is recom-
mended that you zero the probe before each measurement.
• Clamp the probe around the conductor to be tested. The oscillo-
scope should now display the measured conductor current. A posi-
tive 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. Multiply the conversion
ratio (1mV/A or 10mV/A) times the V/Division range on your oscil-
loscope to get the value of the current.
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