AC Current Oscilloscope Probe Model SR661
13
CHAPTER 4
OPERATION
4.1
Current Measurement
WARNING:
Always connect the probe to the instrument before clamping onto
the circuit under test.
• Connect the Model SR661 to the proper input channel on the
oscilloscope.
•
Begin with the least sensitive range on the current probe (1mV/A)
• Select the 0.5V/Division range on the oscilloscope.
• Clamp the probe on the conductor to be measured and read the
current flowing directly on your oscilloscope.
(Remember to unclamp the probe from the conductor before discon-
necting it from your meter or instrument.)
You may also use your oscilloscope to amplify the signal while using
the 1mV/A probe range (which offers the best accuracy and least phase
shift).
NOTE:
It is possible to change the range on the current probe without remov-
ing the probe from the current carrying conductor, but it is important to
remember not to exceed the permissible peak ratings of 2000mV peak or
4000 mV peak to peak maximum. The peak ratings by range are: 20A peak
@ 100mV/A, 200A peak @ 10mV/A and 2000A peak @ 1mV/A.
