Turning The Instrument On; Auto Standby; Dc Zero Adjustment - AEMC MR417 User Manual

3.3 TURNING THE INSTRUMENT ON

To turn the clamp on, push the slide switch to the 1 mV/A or 10 mV/A setting:
MR417
■
1 mV/A corresponds to the 600 A range.
10 mV/A corresponds to the 60 A range.
■ MR527
1 mV/A corresponds to the 1400 A range.
10 mV/A corresponds to the 150 A range.
The green ON indicator should light up:
■ If the indicator blinks, less than 4 hours of battery life remains.
■ If the indicator does not light up, replace the battery (see § 5.2).

3.4 AUTO STANDBY

After 10 minutes of operation without user action (such as pressing the DC Zero
button), the clamp automatically enters Standby mode. In this mode, the ON indicator
will turn OFF.
To reactivate the clamp, press the DC Zero button or change the switch to any
setting other than OFF.
To disable automatic Standby, press and hold down DC Zero when turning the
instrument ON. The ON indicator blinks to indicate that the request has been applied.
The ON indicator will show steady yellow after you release the DC Zero button.

3.5 DC ZERO ADJUSTMENT

NOTE: If the measurement range (or sensitivity) is changed, the DC Zero
must be adjusted before any further measurements are made.
The DC Zero must be adjusted before any series of measurements and
after each disconnection and reconnection.
To adjust the DC Zero:
■ With the clamp connected to the measuring instrument, select the desired
measurement range (or sensitivity) on the switch.
■ Make sure that there is no conductor in the clamp and that its jaws are closed
correctly.
■ Press the DC Zero button.
■ The OL indicator will light up for approximately three seconds to indicate that the
zero adjustment is in progress.
■ The OL indicator will turn off to indicate that the operation has succeeded.
■ If the OL indicator stays on, the zero could not be adjusted.
■ Before repeating the operation, check that the jaws closed correctly (air gaps
clean, no dust, no oxidation, etc.) and that there is no conductor in the clamp.
■ Press the DC Zero button again.
■ In the event of failure, or if the clamp is switched off (selector set to OFF), it is
the last adjustment of the DC Zero that is kept.
12 AC/DC Current Probes MR417 & MR527