Mini Clamp On DMM
• LCD display for Voltage, Current and
Resistance Measurements
• DCA Zero Adjust Knob
All other ranges automatic zero
• Data Hold for all ranges
INSTRUCTION MANUAL
Model 380652
• Mini size for greater portability
1. INTRODUCTION
Congratulations on your purchase of Extech’s Mini Clamp on Meter. This professional meter, with proper care,
will provide years of safe reliable service.
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2. SPECIFICATIONS
2.1 General Specifications
Display 0.5" (13mm), LCD, 3-1/2 digit (±1999
counts)
Measurements AC/DC Voltage/Current and
Resistance
Polarity Automatic Switching; "-" indicates
negative polarity
Current Sensor Hall effect sensor
Zero
Meter dial for DC Current zero
Adjustment
Over-input Display indicates "1" or "-1"
Sampling Time Approximately 0.4 seconds
Time Base Quartz crystal (32768 Hz)
Fuse
500mA fuse
Protection
Battery 006P DC 9V battery (heavy duty
type)
Power
Consumption
Approximately 6mADC (Voltage &
Resistance)
Approximately 12mADC (Current
range)
Operating
32 to 122oF (0 to 50
o
C)
Temp
Operating
Less than 80% RH
Humidity
Weight 0.5 lbs. (225g) (including battery)
Dimension 7.1x1.9x1.4" (180x47x35mm)
Max. conductor
19 φ (19mm diameter)
size
Accessories Instruction Manual, Test Leads,
Carrying Case
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2.2 Range Specifications
Function Range Resolution Accuracy Overload
DCV 200V 0.1V +/- (0.8%rdg
ACV
(50/60HZ)
Resistance
AC Current
(50/60HZ)
DC Current 200A 0.1A +/-(1.2%FS
DATA HOLD Freezes displayed reading. Available on all
Note
3. FRONT PANEL DESCRIPTION
1. Jaw opening
2. Measurement 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
Protection
AC 500V
+1d)
500V 1V +/-
(1%rdg+2d)
200 Ω 0.1Ω
20A/
200A
functions.
Input impedance for ACV & DCV range is 10MΩ
0.01A / 0.1A +/- (1.2%FS
+/(1.2%rdg+1d)
+5d)
+5d)
rms
DC+/-500V
AC/DC
400V
300 ACA
(for 1
minute)
4. PREPARATION FOR MEASUREMENT
4.1 Ensure that the DC 9V battery is connected correctly to its snap terminal and placed in the battery
compartment.
4.2 Slide the "Off/On/Hold" switch to the "ON" position, (except when using the "DATA HOLD" function).
4.3 Place the RED test lead into the proper input terminal before making measurement.
4.4 Remove the test leads from the circuit under test when changing the measurements range.
4.5 Do not exceed the maximum rated voltage to the input terminal.
4.6 Always put the "On/Off/Hold" switch to the "Off" position when the instrument is not in use. Remove the
battery if the instrument is not to be used for a long period of time.
4.7 International Safety Symbols:
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5. OPERATION
5.1 Voltage Measurement
5.1.1. Slide the "On/Off/Hold" switch to the "On" position.
5.1.2. Slide the "V/A/Ω" switch to the "V" position.
5.1.3. Connect the red test lead to the "V" input terminal and the black test lead to the "COM" input terminal.
5.1.4. If the voltage to be measured is AC, slide the "AC/DC" switch to the "AC" position.
5.1.5. If the voltage to be measured is DC , slide the "AC/DC" switch to the "DC" position
5.1.6. Connect test lead probes to the circuit under test.
5.1.7. Read voltage values on the LCD.
5.2 Resistance Measurement
5.2.1. Slide the "ON/Off/Hold" switch to the "On" position.
5.2.2. Slide the "V/A/Ω" switch to the " Ω " position.
5.2.3. Connect the red test lead to the " Ω " input terminal and the black test lead to the "COM" input terminal.
5.2.4. If the resistance being measured is in a circuit, remove all power to that circuit and discharge all
capacitors.
5.2.5. Connect test lead probes to the circuit (resistance) under test.
5.2.6. Read the resistance values on the LCD.
5.2.7. Measurement consideration: There are small stray resistances (approx. 0.8 ohms) in the test leads. If
you need to make precise measurements, first short the test leads then record the displayed value.
After taking a measurement, deduct the above stray resistance value from the displayed reading.
5.3 AC Current Measurement
5.3.1. Slide the "On/Off/Hold" switch to the "On" position.
5.3.2. Slide the "V/A/ Ω " switch to the "A" position.
5.3.3. Slide the "AC/DC" switch to the "AC" position.
5.3.4. Determine the highest anticipated current (200A, 20A) and set the "20A/200A" switch to the most
appropriate position.
5.3.5 Press the trigger to open the current jaw. Clamp around the conductor under test.
5.3.6. Read ACA values on the digital display.
5.4 DC Current Measurement
5.4.1. Slide the "On/Off/Hold" switch to the "On" position.
5.4.2. Slide the "V/A/ Ω" switch to the "A" position
5.4.3. Slide the "AC/DC" switch to the "DC" position.
5.4.4. Slide the "20A/200A" switch to the "200A" position.
5.4.5 Adjust the DCA Zero Adj. knob until the display shows "0".
Consideration: The core of the current jaw may retain magnetism after use. If this happens the display may
not reach "0" when adjusting the "DC Zero" knob.
To correct this, either:
a. Change the direction of the measured DC current, or
b. Open and close the jaw several times.
5.5. Data Hold
When taking any measurements, if you slide the "On/Off/hold" switch to the "Hold" position, the last
measurement taken will remain on the display. To disable the data hold function, slide the "ON/Off/Hold" switch
to the "On" position.
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6. MAINTENANCE
(
6.1 Battery Replacement
6.1.1 When the battery output falls to less than approx. 6.5V-7.5V, The LOBAT icon appears on the left
corner of the LCD display. This indicates that the battery needs to be replaced. However, in-spec
measurements can still be made for several hours after the low battery indicator first appears.
6.1.2 Open the battery compartment with a screwdriver or small coin.
6.1.3 Replace the 9V battery and reinstall the compartment cover.
6.2 Cleaning
Caution: Use only a dry cloth to clean the plastic case.
6.3 Fuse Replacement
6.3.1 This instrument is provided with a 5x20mm, 500mA fuse for user safety. When a particular function is
not operating, check to see if the fuse is blown.
6.3.2 To replace a fuse, first open the battery compartment cover and replace with a fuse of the same rating
and reinstall the battery cover.
7. CALIBRATION / REPAIR SERVICES
Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration,
NIST certification or repair of any Extech product, call customer service for details on services available.
Extech recommends that calibration be performed on an annual basis to insure calibration integrity.
8. 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 on 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 (781) 890-7440 for
authorization. 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.
Copyright © 1999 Extech Instruments Corporation. All rights reserved including
the right of reproduction in whole or in part in any form
Tech Support Hotlines
781-890-7440 ext. 200
extech@extech.com
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