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4.1.5
Auto-Off
•
The Models MR461 and MR561 have an Auto-off feature which
turns off the instrument after 10 minutes if no control has been
used.
•
When the probe is switched off by this automatic function, the
switch must first be set to the off position before the probe may be
powered up again.
•
Auto-off may be disabled at power-up by the user. Simply press
the auto zero button at the same time as moving the switch from
the OFF position to one of the ranges. The green LED blinks three
times to indicate that the auto-off is disabled.
4.2
Tips For Getting the Best Accuracy
The Models MR461 and MR561 are capable of measuring DC to 10KHz
currents over a wide range. Here are some key considerations for getting
the most accuracy from your display instrument:
•
When using the Models MR461 and MR561 with an oscilloscope,
it is important to select the range that provides the best resolu-
tion.
•
Make sure that probe jaw mating surfaces are free of dust and
contamination.
•
Beware of short-circuit currents. Large in-rush DC currents (which
can occur when power is first applied in a circuit) and large high-
current transients may cause varying degrees of residual read-
ings. If in doubt of a particular reading, remove the probe from
the conductor under test and check to see that the display device
returns to zero. If not, it will be necessary to rezero the probe.
16
Shop for AEMC products online at:
AC/DC Current Probe Models MR461 and MR561
ShopAEMC
www.
.ca
1.800.561.8187
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