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OPERATING INSTRUCTIONS
AUTORANGING DIGITAL MULTIMETER
PDMT25
www.pyleaudio.com
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SAFETY WARNINGS
The following safety information must be observed to insure
maximum personal safety during the operation at this meter:
Measurements beyond the maximum selected
range must not be attempted.
Extreme care must be taken when measuring
above 50 V, especially on live bus-bars.
To measure voltage, the instrument must not be
switched to a current or resistance range, or to the
diode check or buzzer position.
Circuits must be de-energised and isolated before
carrying out resistance tests.
The rotary selector switch must only be turned
after removing test connections.
All external voltages must be disconnected from
the instrument before removing the battery.
Test leads and prods must be in good order, clean,
and with no broken or cracked insulation.
UK Safety Authorities recommend the use of fused
test leads when measuring voltage on high energy
systems.
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Replacement fuses must be of the correct type
and rating.
The instrument must not be used if any part of it is
damaged.
Warnings and precautions must be read and
understood before an instrument is used. They
must be observed during the operation of this
instrument.
Symbols used on this instrument are:
Caution: refer to accompanying notes.
This symbol indicates that the
operator must refer to an explanation
in the Operating Instructions to avoid
personal injury or damage to the
meter.
Caution: risk of electric shock
This WARNING symbol indicates a
potentially hazardous situation, which
if not avoided, could result in death or
serious injury.
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This CAUTION symbol indicates a
potentially hazardous situation, which
if not avoided, may result damage to
the product.
This symbol advises the user that the
terminal(s) so marked must not be
connected to a circuit point at which
the voltage with respect to earth
ground exceeds (in this case) 1000
VAC or VDC.
Equipment protected throughout by
Double Insulation (Class II)
Equipment complies with current EU
directives.
MAX
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SYMBOLS AND ANNUNCIATORS
))) Continuity
BAT Low Battery
Diode test
HOLD Data Hold
AUTO AutoRanging
AC Alternating Current or Voltage
DC Direct Current or Voltage
MAX/MIN Stores the highest or lowest measurement
PEAK Find glitches and transients without a
scope
Backlight
V Volts
A, mA,uA Current range
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OPERATION
To turn on the instrument turn the range knob from the
OFF position to any measurement range.
Note:
For best battery life ALWAYS turn the function switch
to the OFF position when the meter is not in use. This
meter has Auto OFF that automatically shuts the meter
OFF if 30 minutes elapse between uses.
NOTE: On some low AC and DC voltage ranges, with
the test leads not connected to a device, the display
may show a random, changing reading. This is normal
and is caused by the high-input sensitivity. The reading
will stabilize and give a proper measurement when
connected to a circuit.
MODE button
To select AC or DC measurement when in Voltages,
Amps, mA , uA ,Ω,
, ))) ,℃ or ℉ranges.
HOLD button
The HOLD function allows the meter to "freeze" a
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measurement for later reference.
1. Press the HOLD button to “freeze” the reading on
the indicator. The “HOLD” message will be appear
in the display.
2. Press the HOLD button again to return to normal
operation
.
BACKLIGHT button
1. Press the BACKLIGHT button to switch on the
display light.
2. Press BACKLIGHT button again to exit the light
mode.
MAX/MIN button
The MAX/MIN function allows the meter to capture the
highest or lowest measurement for later reference.
3. Press the MAX/MIN button to begin measurement.
The indicator “MAX” or MIN will appear in the
display.
4. If the “MAX MIN” messages are flashing, the
instrument is in MAX/MIN mode but not recording,
press the MAX/MIN button to select a mode.
5. To return to normal AUTO measurement mode, hold
down the MAX/MIN button for 2 seconds.
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Peak Hold button
The Peak Hold function captures the peak AC or DC
voltage or current. The meter can capture negative
or positive peaks as fast as 1 millisecond in duration.
1. Turn the function switch to the A or V position.
2. Use the MODE button to select AC or DC.
3. Allow time for the display to stabilize.
4. Press and Hold the PEAK button until “CAL”
appears in the display. This procedure will zero
the range selected.
5. Press the PEAK button, Pmax will display.
6. The display will update each time a higher
positive peak occurs.
7. Press the PEAK button again, Pmin will display.
The display will now update and indicate the
lowest negative peak.
8. To return to normal operation, press and hold
the PEAK button until the Pmin or Pmax
indicator switches off.
Note: If the Function switch position is changed after a
calibration the Peak Hold calibration must be repeated
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for the new function selected.
RANGE button
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 button. The “Auto Range”
display indicator will turn off, The “Manual
Range” display indicator will turn on
2. Press the RANGE button to step through the
available ranges until you select the range you
want.
3. Press and hold the RANGE button for 2 seconds to exit
the ManualRanging mode and return to AutoRanging.
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