Amprobe ACD-6 Pro User manual

USER'S
MANUAL
ACD-6 Pro
ACD-6 TRMS Pro
Versatile Clamp-on
Multimeter Series

1
1) SAFETY
This manual contains information and warnings that must be followed for operating the
instrument safely and maintaining the instrument in a safe operating condition. If the
instrument is used in a manner not specified by the manufacturer, the protection
provided by the instrument may be impaired.
The meter meets the requirements for double insulation to IEC61010-2-032(1994),
EN61010-2-032(1995), UL3111-2-032(1999):
Category III 600 Volts AC and DC.
PER IEC61010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be
supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the
installation. Note – Examples include electricity meters and primary over-current
protection equipment.
TERMS IN THIS MANUAL
!" WARNING identifies conditions and actions that could result in serious injury or
even death to the user.
!" CAUTION identifies conditions and actions that could cause damage or
malfunction in the instrument.

2
WARNING
To reduce the risk of fire or electric shock, do not expose this product to rain or
moisture. The meter is intended only for indoor use.
To avoid electrical shock hazard, observe the proper safety precautions when working
with voltages above 60 VDC or 30 VAC rms. These voltage levels pose a potential
shock hazard to the user.
Inspect test leads, connectors, and probes for damaged insulation or exposed metal
before using the instrument. If any defects are found, replace them immediately.
Do not touch test lead tips or the circuit being tested while power is applied to the
circuit being measured. To avoid accidentally short circuit of bare (uninsulated)
hazardous live conductors or busbars, switch them off before insertion and removal of
the current clamp jaws. Contact with the conductor could result in electric shock. Keep
your hands/fingers behind the hand/finger barriers that indicate the limits of safe
access of the meter and the test leads during measurement.
CAUTION:
Disconnect the test leads from the test points before changing meter functions.
INTERNATIONAL ELECTRICAL SYMBOLS
! Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
Fuse
AC--Alternating Current
DC--Direct Current
2) CENELEC Directives
The instruments conform to CENELEC Low-voltage directive 73/23/EEC and
Electromagnetic compatibility directive 89/336/EEC

3
3) PRODUCT DESCRIPTION
This user's manual uses only representative model(s) for illustrations. Please refer
specification details for function availability to each model.
1) Transformer Clamp Jaw for AC
current magnetic field pick up
2) Hand/Finger Barrier to indicate
the limits of safe access of the meter
during measurement
3) Push-buttons for special functions
& features
4) Input Jack for all functions
EXCEPT non-invasive ACA current
function
5) Common (Ground reference)
Input Jack for all functions EXCEPT
non-invasive ACA current function
6) Slide-switch Selector to turn the
power ON/OFF and Select a
function
7) 3-3/4 digits 4000 counts LCD
display
8) Jaw trigger for opening the
transformer clamp jaw
9) Jaw center Indicators, at where
best ACA accuracy is specified
10) Jaw marking lines for ACA
position error indication

4
4) OPERATION
DC Voltage and AC Voltage functions
Inputs are made through the test lead terminals.
Note: DC 400.0mV range is designed with 1000M# high input impedance for least
current drain in measuring small signals, and can cope better with most commercially
available voltage output transducers/adapters. The non-zero display reading is normal
when the meter inputs are open circuit, which will not affect actual measurement
accuracy. The meter will show a close to zero reading when the inputs are shorted.
Open input is actually a floating condition, which is not a zero-volt-input condition.
Note: AC 400.0mV range selection is by RANGE button manually, and is specified from
AC 40mV & up for ACD-6 Pro and from AC 60mV & up for True RMS model ACD-6
TRMS Pro.

5
CAUTION
Using Resistance, Continuity or Diode function in a live circuit will produce false results
and may damage the instrument. In many cases the suspected component must be
disconnected from the circuit to obtain an accurate measurement reading.
# Resistance, and Continuity functions
Inputs are made through the test lead terminals. Slide-switch on defaults at #. Press
SELECT button momentarily to select Continuity function, which is convenient for
checking wiring connections and operation of switches. A continuous beep tone
indicates a complete circuit.

6
Diode test function
Inputs are made through the test leads terminals. Place slide-switch to # position.
Press SELECT button momentarily 2 times to select Diode test function. Normal
forward voltage drop (forward biased) for a good silicon diode is between 0.400V to
0.900V. A reading higher than that indicates a leaky diode (defective). A zero reading
indicates a shorted diode (defective). An OL indicates an open diode (defective).
Reverse the test leads connections (reverse biased) across the diode. The digital
display shows OL if the diode is good. Any other readings indicate the diode is resistive
or shorted (defective).

7
ACA Current clamp-on function
Inputs are made through the clamp jaws for non-invasive ACA current measurements.
CAUTION
Press the jaw trigger and clamp the jaws around only one single conductor of a circuit
for load current measurement. Make sure the jaws are completely closed, otherwise
this will introduce measurement errors. Enclosing more than one conductor of a circuit
will result in differential current (like identifying leakage current) measurement.
Adjacent current-carrying devices such as transformers, motors and conductor wires
will affect measurement accuracy. Keep the jaw’s tip away from them as much as
possible to minimize influence.

8
HOLD
The hold feature freezes the display for later viewing. Press the HOLD button
momentarily to activate and to exit the hold feature.
Relative zero mode
Relative zero mode allows the user to offset the meter consecutive measurements
with the displaying reading as the reference value. The display will now show readings
relative to the stored reference value. That is, display = reading - stored value. Press
the button momentarily to activate and to exit relative zero mode.
Manual or Auto-ranging
Press the RANGE button momentarily to select manual-ranging mode, and the meter
will remain in the range it was in, the LCD symbol turns off. Press the button
momentarily again to step through the ranges. Press and hold the RANGE button for 1
second or more to resume auto-ranging mode.
Auto Power Off (APO)
When the meter is on, the Auto Power Off (APO) feature will switch the meter to sleep
mode automatically after approximately 30 minutes of no slide-switch or push button
operations to extend battery life. To wake up the meter from APO, press the buttons
momentarily or set the slide-switch to the OFF position and then slide back on again.
Always set the slide-switch to the OFF position manually when the meter is not in use.

9
5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks, and turn OFF the meter before opening the case. Do not operate
with open case.
Trouble Shooting
If the instrument fails to operate, check batteries and test leads etc., and replace as
necessary. Double check operating procedure as described in this user’s manual
If the instrument voltage-resistance input terminal is subjected to a high voltage
transient (caused by lightning or switching surge to the system) by accident or
abnormal conditions of operation, the series fusible resistors will be blown (become
high impedance) just as standard fuses to protect the user and the instrument. Most
measuring functions through this terminal will then be open circuit. The series fusible
resistors and the spark gaps should then be replaced by qualified technician. Refer to
the LIMITED WARRANTY section for obtaining warranty or repairing service.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives
or solvents. If the meter is not to be used for periods of longer than 60 days, remove
the batteries and store them separately