Extech Instruments EX470A User Manual page 12

AUTORANGING/MANUAL RANGE SELECTION
When the meter is first turned on, it automatically goes into AutoRanging. This automatically selects
the best range for the measurements being made and is generally the best mode for most
measurements. For measurement situations requiring that a range be manually selected, perform
the following:
1. Press the RANGE key. The "AUTO" display indicator will turn off.
2. Press the RANGE key to step through the available ranges until you select the range you
want.
3. To exit the Manual Ranging mode and return to AutoRanging, press and hold the RANGE
key for 2 seconds.
Note: Manual ranging does not apply for the Capacitance, Frequency and Temperature functions.
RELATIVE MODE
The relative measurement feature allows you to make measurements relative to a stored reference
value. A reference voltage, current, etc. can be stored and measurements made in comparison to
that value. The displayed value is the difference between the reference value and the measured
value.
1. Perform the measurement as described in the operating instructions.
2. Press the REL button to store the reading in the display and the "REL" indicator will appear
on the display.
3. The display will now indicate the difference between the stored value and the measured value.
4. Press the REL button to exit the relative mode.
Note: The Relative function does not operate in the Frequency function.
DISPLAY BACKLIGHT
Press and hold the HOLD key for >1 second to turn on or off the display backlight function.
Note: The HOLD feature will activate when the Backlight is turned on. Press the HOLD key
again to exit Hold.
HOLD
The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or
to exit the HOLD function.
AUTO POWER OFF
The auto off feature will turn the meter off after 15 minutes.
LOW BATTERY INDICATION
The icon will appear in the lower left conner of the display when the battery voltage becomes
low. Replace the battery when this appears.
WRONG CONNECTION INDICATION
The icon will appear in the upper right conner of the display and the buzzer will sound
whenever the positive test lead is inserted into the 10A or uA/mA input jack and a non-current
(green, black or red) function is selected. If this occurs, turn the meter off and reinsert the test lead
into the proper input jack for the function selected.
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