CMI-2000
7
Using the Features
•
SELECT:
Press momentarily to toggle between functions, measurement modes, or display modes. The
last used setting becomes the default when that function is selected again. To change the default, select
a new setting. The setting will be stored in nonvolatile memory.
•
Backlight:
Press the
SELECT
button for 1 second to toggle the LCD backlight. The backlight
automatically turns off after 32 seconds to extend battery life.
•
RANGE:
The meter has both a manual and auto ranging feature. Press the
RANGE
button momentarily
and release to select manual ranging. The
icon is no longer present on the LCD. Press the
button again to step through the ranges. Press and hold the
RANGE
button for a minimum of 1 second
and release to resume auto ranging. Manual ranging feature is not available in Hz and
modes.
•
∆ ZERO:
Press momentarily to toggle between zero and normal mode. In zero mode the value on the
LCD when the button is pressed becomes the offset. As the input value changes, the offset is subtracted
from the actual value. This modified value is shown on the LCD.
•
EF:
Set the meter to any current or voltage function, including AutoCheck™. Press and hold until
the meter displays “EF” to detect the electric field that surrounds current-carrying conductors. Signal
strength is displayed as a series of dashes on the display.
• Use the tester’s built-in antenna for tracing live circuits or locating a break in a wire.
• For more precision, such as distinguishing between current-carrying and ground wires, connect a
test lead to the + input terminal and use it as a probe for direct contact verification of a signal.
•
HOLD:
Press momentarily to hold the present value on the display. Press again to exit this mode.
•
CREST:
Press the
CREST
button for a minimum of 1 second to activate Crest Max Mode. LCD will
indicate
MAX when mode is active. This mode will capture current or voltage peaks in duration of as
small as 5 ms. Momentarily press and release the
CREST
button to toggle between
MAX and
MAX + HOLD. Press the
CREST
button for a minimum of 1 second and release to exit Crest Max
Mode. Auto ranging and APO are disabled automatically in this mode.
•
Auto Power Off (APO):
Turns the meter off automatically to extend battery life after approximately
34 minutes of no rotary switch or pushbutton operations. To wake up the meter from APO, press the
SELECT
button momentarily and release or turn the rotary switch
OFF
and then back on. Always turn the
rotary switch to the
OFF
position when the meter is not in use.
•
Disable APO:
Press and hold the
SELECT
button while turning the meter on. Turn the rotary switch
OFF
and then back on to resume normal functionality.
•
Disable Beeper:
Press the
RANGE
button while turning the meter on to temporarily disable the beeper
feature. Turn the rotary switch
OFF
and then back on to resume.
•
AutoCheck™:
Single switch position that is able to differentiate between ACV, DCV, and Resistance.
Input voltages greater than the threshold of 1.5 V and up to the limit of 1000 V will be displayed by the
meter with the appropriate units, ACV or DCV. Units are determined by what component of the input
signal has a larger peak magnitude.
• Do not use AutoCheck™ mode on circuits that could be damaged by such low input impedances.
Instead use either ACV or DCV mode, whichever is applicable.
• When making an expected resistance measurement, if the meter displays a voltage reading, this
should alert the user that the circuit under test is energized.
• When there is no voltage on the meter’s input but the presence of a resistance below 10 MΩ, the
meter will display the resistance value. If the resistance is within the audible range specified for the
continuity function, the meter will sound continuously.
•
LoZ:
When in AutoCheck™ mode, the meter has a low initial impedance of approximately 2.5 kΩ and
600 pF. The impedance increases abruptly if a high AC or DC voltage is sensed on the meter’s input. This
low input impedance dissipates “ghost” voltages from the line.
The following table shows the nominal input impedance versus actual voltage.
Actual Voltage (AC or DC)
Impedance
> 1.5 V or < -1.5 V
2.5 kΩ
100 V
10 kΩ
300 V
60 kΩ
600 V
200 kΩ
1000 V
420 kΩ
