The following describes the indicators displayed by the LCD.
16. this symbol appears when the battery needs replacement.
NOTE: A low battery will adversely affect accuracy.
17. AC: Indicates that alternating current/voltage is being measured.
18. Minus (—): I n d i cates the value measured has a negative polarity.
19. DC: Indicates that direct current/voltage is being measured.
20. AT: Indicates the meter is in the autoranging mode.
21. MAX: Indicates the meter is displaying the maximum
value recorded.
22. Indicates the meter is currently recording the maximum and
minimum values.
23. MIN: Indicates the meter is displaying the minimum
value recorded.
24.
•
)
)
)
: Indicates the meter is in the continuity measurement mode.
25. Indicates the meter is in the diode test mode.
26. D.H.: Indicates the value displayed is held on screen
(the data hold button is pressed).
27. R.H.: Indicates the meter is in the manual ranging mode
(the Range button has been pressed).
28. Function and Units of Measurement:
29. OFL: This symbol appears when the input value exceeds
the meters selected range or overall specification.
Operating Instructions
Auto Power Off
The instrument automatically shuts off after 30 minutes of inactivity.
The meter is considered active when there is a change of at least 10
digits during the period (i.e., the meter senses a change from 24.04
volts to 24.14 volts)
To disable this function; press and hold the "MIN/MAX" or the
"RANGE" button while turning the meter on. This function will be
active in all modes, including RECORD and TIME STAMP, unless it
is disabled.
Auto / Manual Range
This instrument is capable of providing either auto (instrument
controlled), or manual (operator controlled) ranging. In the autorange
mode, the meter automatically selects the range that gives you the best
resolution of the value measured. For example, if you were measuring
a 9 volt battery that actually put out 9.6 volts, the meter would
automatically display “9.60”, although it has the ability to display “9” or
“9.6” for the same battery. The far left, or most significant digit, can
only display “0” through “3”, so “9.600” could not be displayed,
instead the symbol “0.FL” would appear on the display indicating the
measured value exceeded the range selected. The meter automatically
enters the autoranging mode when it is first turned on, or if a new
function is selected using the rotary dial. In the autoranging mode, the
symbol “AT” appears on the display.
Although the autoranging mode is easy to use, there are times that you
may prefer the manual ranging mode. For example, suppose you were
measuring a series of connectors you know had either 24 or 120 volts
AC on them. If your goal was to see which terminal had what voltage
applied, the task would go faster and easier if you set the meter to hold
the 400 volt range. To select manual range control, press the “RANGE”
push-button for approximately 1/2 second. As you release the button,
the symbol “R.H” appears at the top of the display, and an audible tone
sounds to alert you that the meter has changed ranges or modes. Each
subsequent time the RANGE button is pressed, the range increases one
step, and a tone sounds until it reaches its highest range. The next press
of the range hold button will return the meter to its lowest range.
Recording MIN/MAX
After selecting the mode and range you will be using, you can enable
the MIN/MAX recording function. This function allows you meter to
store the highest and lowest readings obtained in the following modes:
• AC Amps • Temperature
• AC and DC Volts • DC microamps
• Ohms
You may recall and cycle through the high and low readings or view
the measurement currently being make while you are in the record
mode. Pressing the “MIN/MAX” button locks the meter in the range it
was in at that moment and begins the recording precess. Be sure you
are in a range that can display the minimum and maximum values you
are monitoring (you may prefer to select this range manually). Each
time a new high or low value is recorded, an audible beep sounds.
DL250-MAN P. 3
BAT
R
29
16
17
18
19
20
21 22 23 24 25 26 27
28
Symbol Function or Value
°C Degrees Centigrade
°F Degrees Fahrenheit
µF Micro Farads
mV Millivolts
V Volts
µA Micro Amps (Test Lead
Measurement Ranges)
A Amps (Inductive Clamp Ranges)
M Mega (Value x 1,000,000)
K Kilo (Value x 1,000)
Ω Ohms (Resistance Value)
