CA250

User’s Guide Model CA250 400A AC/DC Current Clamp-on MultiMeter Adaptor Introduction Congratulations on your purchase of the Extech CA250 400 Amp AC/DC ClampOn MultiMeter Adaptor. With this clamp adaptor, a current can be measured by simply clamping around a single conductor. The adaptor outputs an mV signal that is proportional to the measured current and displayed on a DMM. Careful use of this device will provide years of reliable service. Current Measurements 1. 2. 3. 4. 5. 6. Set the DMM to the AC or DC mV range or to the lowest voltage range. Connect the RED test lead to the DMM '+' Voltage terminal and the BLACK lead to the '-' COM terminal. Set the adaptor to the 40A (AC or DC) or the 400A (AC or DC) range. Press the Jaw Trigger to open the jaw and clamp around a single conductor. The unit will output an AC or DC voltage proportional to the measured current. (40A range:10mV/A, 400A range:1mV/A) Read the voltage on the DMM display and interpret as current.(direct mV to A on the 400A range, divide by 10 on the 40A range) Specifications Measurement Ranges Adaptor Output Frequency range Safety Standards Accuracy Jaw size Operating Conditions Storage Conditions Battery Dimensions/Weight 0 to 40 Amps AC/DC 0 to 400 Amps AC/DC 10mV/Amp on the 0 to 40A range 1mV/Amp on the 0 to 400A range 50/60Hz EN61010-1 and IEC61010-1 2nd Edition (2001) to Category III 600V and Category IV 300V; Pollution Degree 2 in accordance with IEC 664 indoor use. C C 0 to 40A ± (2.5% + 0.1A) 0 to 400A ± (2.8% + 0.5A) 1.2" (30mm) 32 to 122 F F (0 to 50 C) < 70% RH o o -4 to 158 F(-20 to 70 C)