Extech Instruments 380652 User manual

User's Guide
Mini Clamp-On DMM
Model 380652
Introduction
Congratulations on your purchase of the Extech Mini Clamp-On DMM. This meter
measures and displays Voltage, Current, and Resistance. The DCA zero adjustment
permits relative and offset DC current measurements. Careful use of this meter will provide
years of reliable service.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech 380652 Product Page

Model 380652 Version 3.0 June 20052
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it
should become necessary to return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at [phone] ext. 210 for authorization or visit our website www.extech.com
for contact information. A Return Authorization (RA) number must be issued before any product is returned to
Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent
damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or
oral, is expressed or implied.
Specifications
General Specifications
Display 3 ½ digit (±1999 display counts) LCD
Measurements AC/DC Voltage, AC/DC Current, and Resistance
Polarity Automatic Switching; ‘-’ indicates negative polarity
Current Sensor Hall effect sensor
Zero Adjustment Adjustment dial for DC Current zero
Over-input Display indicates ‘1’ or ‘-1’
Sampling Time Approximately 0.4 seconds
Time Base Quartz crystal (32.768 KHz)
Battery 9V battery
Power Consumption Approximately 6mADC (Voltage & Resistance)
Approximately 12mADC (Current range)
Operating Temp 32 to 122oF (0 to 50oC)
Operating Humidity Less than 80% Relative Humidity
Weight 0.5 lbs. (225g) - including battery
Dimension 7.1 x 1.9 x 1.4’ (180 x 47 x 35mm)
Max. Conductor size 19 φ [0.75’ (19mm) diameter]
Accessories Instruction manual, test leads, and carrying case
Range Specifications
Function Range Resolution Accuracy
Overload
Protection
DCV 200V 0.1V ± (0.8%rdg + 1d)
ACV (50/60 Hz) 500V 1V ± (1%rdg + 2d)
AC 500V rms
DC ±500V
Resistance 200Ω0.1Ω± (1.2%rdg + 1d) AC/DC 400V
AC Current
(50/60 Hz)
20A/
200A
0.01A / 0.1A ± (1.2%FS + 5d)
DC Current 200A 0.1A ± (1.2%FS + 5d)
300 ACA
(for 1 min.)
DATA HOLD Freezes displayed reading. Available on all functions.
Note: The input impedance for ACV & DCV ranges is 10MΩ

Model 380652 Version 3.0 June 20053
Meter Description
1. Measuring Jaw
2. Jaw Trigger
3. 20A / 200A AC Select Switch
4. DCA Zero Adjust Dial
5. Power/Data Hold Select Switch
6. AC / DC Select Switch
7. Volts / Amps / Resistance Select Switch
8. LCD display
9. Input Terminal for Voltage
10. COMMON input terminal
11. Resistance Input Terminal
Safety
1. Ensure that the DC 9V battery is connected correctly to its snap terminal and placed in
the battery compartment.
2. Slide the ‘Off/On/Hold’ switch to the ON position, (except when using the DATA HOLD
function).
3. Place the RED test lead into the proper input terminal before making measurements.
4. Remove the test leads from the circuit under test when changing the measurement
range.
5. Do not exceed the maximum rated input voltage.
6. Always put the ‘On/Off/Hold’ switch to the OFF position when the instrument is not in
use.
7. Remove the battery when the instrument is to be stored.
8. International Safety Symbols:

Model 380652 Version 3.0 June 20054
Operation
Voltage Measurements
1. Slide the Off/On/Hold switch to the ON position.
2. Slide the V/A/Ωswitch to the Vposition.
3. Connect the red test lead to the Vinput terminal and the black test lead to the COM
input terminal.
4. If the voltage to be measured is AC, slide the AC/DC switch to the AC position.
5. If the voltage to be measured is DC , slide the AC/DC switch to the DC position
6. Connect test lead probes to the circuit under test.
7. Read voltage values on the LCD.
Resistance Measurements
1. Slide the Off/On/Hold switch to the ON position.
2. Slide the V/A/Ωswitch to the Ωposition.
3. Connect the red test lead to the Ω input terminal and the black test lead to the COM
input terminal.
4. If the resistance being measured is in a circuit, remove all power to that circuit and
discharge all capacitors.
5. Connect test lead probes to the circuit (resistance) under test.
6. Read the resistance values on the LCD.
Note: There are small stray resistances (approx. 0.8 ohms) in the test leads. Before
taking measurements short the test leads and note the meter reading. After taking a
measurement, deduct the stray resistance value (noted earlier) from the displayed
reading.
AC Current Measurements
1. Slide the Off/On/Hold switch to the ON position.
2. Slide the V/A/Ωswitch to the Aposition.
3. Slide the AC/DC switch to the AC position.
4. Determine the highest anticipated current (200A, 20A)
and set the 20A/200A switch to the appropriate position.
5. Press the trigger to open the current jaw. Clamp around
the conductor under test.
6. Read ACA values on the digital display.
DC Current Measurements
1. Slide the Off/On/Hold switch to the ON position.
2. Slide the V/A/Ωswitch to the Aposition
3. Slide the AC/DC switch to the DC position.
4. Slide the 20A/200A switch to the 200A position.
5. Adjust the DCA Zero knob for a zero reading.
6. Press the trigger to open the current jaw. Clamp around the conductor under test.
7. Read DCA values on the digital display.

Measurement Considerations
The core of the current jaw may retain magnetism after use. If this happens the display
may not reach zero when adjusting the DCA zero dial. To correct this, either:
a. Change the direction of the measured DC current, or
b. Forcefully snap the jaws open and close several times.
Data Hold
While taking measurements slide the Off/On/hold switch to the Hold position to freeze the
displayed reading. To return to normal operation, slide the switch to the ON position.
Maintenance
Battery Replacement
When the battery power drops below the acceptable operating voltage (approx. 7V), the
LO BAT icon appears on the LCD display. This indicates that the battery needs to be
replaced soon. However, in-spec measurements can still be made for several hours after
the low battery indicator appears. To replace the battery:
1. Open the battery compartment with a screwdriver or small coin.
2. Replace the 9V battery and secure the compartment cover.
Cleaning
Use only a dry cloth to clean the plastic case. Do not use solvents, abrasives, or harsh
detergents.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech 380652 Product Page
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com