User’s Guide
Model CA310
300A AC Current Clamp-on
MultiMeter Adaptor
300 AMP AC CLAMP ADAPTOR
OUTPUT VOLTAGE: 1mV AC Per 1A AC
CATII 600V
CA300
Introduction
Congratulations on your purchase of the Extech CA310 300 Amp AC Clamp-On MultiMeter
Adaptor. With this clamp adaptor an AC current can be safely measured by simply clamping around a single conductor. The adaptor outputs an AC mV signal that is proportional to the measured AC current. The DMM mV reading (times 10) is equivalent to the value of the AC current. Careful use of this device will provide years of reliable service.
Specifications
Sensor type
Measurement Range
Adaptor Output
Frequency range
Induction coil
0.1 to 300 Amps AC
10mV AC output to DMM per 1A AC measurement
50/60Hz
Working voltage 600V CAT II (IEC 1010-1)
Maximum output impedance 45 Ω
Accuracy
Temperature coefficient
± (3.0% + 10mV) for readings less than 50A
± (2.0% + 5mV) for readings greater than 50A
0.2 times the specified accuracy per o C < 18 o C or > 28 o C
Jaw size
Operating Conditions
Dimensions/Weight
1.2" (30mm)
32 to 122 o F (0 to 50 o C) < 80% RH
3.2 x 6.1 x 1.4" (80 x 156 x 35mm); 7.8 oz. (220g)
NOTE: Accuracy is specified for a period of one year for ambient conditions 64 o F to 84
(18 o C to 28 o C) < 80% RH. o F
Safety
Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
This symbol indicates that double insulation is used.
WARNING : This indicates that a potentially hazardous condition which, if not avoided, could result in death or serious injury.
Safety Precautions
1. WARNING : Improper use of this meter can cause damage, shock, injury or death.
Read and understand this manual before operating the meter.
2. Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage before use.
3. Do not use on non-insulated conductors at voltages greater than 250VAC rms or DC.
AC Current Measurements
1. Set the DMM to the AC mV range or to a low AC voltage range.
2. Connect the RED test lead to the DMM '+' Voltage terminal and the BLACK lead to the '-' COM terminal.
3. Press the Jaw Trigger to open the jaw and clamp around a single conductor.
Read mV
Incorrect Correct
CL
AM mV
P A
AC
DA r 1
PTO
30
0 A
OU
MP
AC
LTA 60 0V
CA
TII
CA3
00
Set to AC V
Voltage input
4. Read the voltage on the DMM display and then divide this reading by 10 to get the current reading in Amps (10mV AC per 1A of AC current).
Refer to the TABLE below for examples of interpreting the DMM display:
Note: Do not apply voltage to the clamp adaptor’s test leads
Note: For small currents, use the RELATIVE function (if available) on the DMM with no wire clamped to zero the meter and improve accuracy.
DMM AC Range
V range mV range mV range mV range
Interpreting the DMM display
Current DMM Display
300A
199A
03.00 V
1990 mV
20A
2A
200.0 mV
20.00 mV
Display ÷ 10 = A
0.300
199
20
2
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 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an
RA number). 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.
Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: [email protected]
Repair/Returns: Ext. 210; Email: [email protected]
Website: www.extech.com
Copyright © 2003 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
Model CA310 Version 1.1 06/03
