Autoranging/Manual Range Selection - Extech Instruments EX510 User Manual

FREQUENCY/DUTY CYCLE MEASUREMENTS (Electronic)
1. Set the rotary function switch to the green "Hz %" position.
2. Press the Hz/% button to indicate "Hz" on the display.
3. Insert the black lead banana plug into the negative COM jack
and the red test lead banana plug into the positive Hz jack.
4. Touch the test probe tips to the circuit under test.
5. Read the frequency on the display.
6. Press the Hz/% button again to indicate "%" on the display.
7. Read the % of duty cycle on the display.

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 Frequency functions.
MAX/MIN
Note: When using the MAX/MIN function in Autoranging mode, the meter will "lock" into
the range that is displayed on the LCD when MAX/MIN is activated. If a MAX/Min
reading exceeds that range, an "OL" will be displayed. Select the desired range
BEFORE entering MAX/MIN mode.
1. Press the MAX/MIN key to activate the MAX/MIN recording mode. The display icon
"MAX" will appear. The meter will display and hold the maximum reading and will update
only when a new "max" occurs.
2. Press the MAX/MIN key again and the display icon "MIN" will appear. The meter will
display and hold the minimum reading and will update only when a new "min" occurs.
3. To exit MAX/MIN mode press and hold the MAX/MIN key for 2 seconds.
8 EX510 V2.2 4/05/07