Extech 380940 Instruction Manual

INSTRUCTION MANUAL

Model 380940

DC / AC True RMS Watt Clamp DMM

• 10W or 100mA resolution

• Large 3 3/4 digit LCD display with 40 segment bargraph

• Continuity and Frequency Measurements

• One touch DCA zero adjust

• MIN/MAX and Data Hold functions

• 0.9” (23mm) Jaw diameter

1. INTRODUCTION

Congratulations on your purchase of Extech’s Watt Clamp Meter. This professional meter, with proper care,
will provide years of safe reliable service.

1 380940es Ver. 1.02 11/99

2. SPECIFICATIONS

2.1 General Specifications

Display 3-3/4 (4000 count) Digit LCD with 40 segment bargraph
Functions Watts, ACA, DCA, ACV, DCV, Frequency
Polarity “-“ indicates negative polarity
Current sensor Hall effect sensor type
Overload

Left blinking digit
indication
DCA zero adjust One touch zero key
Display rate 2 readings/second (20 readings/second for bargraph)
Auto Power Off 30 minutes after power ON
Battery Two 1.5V AA batteries
Operating temp. 40F to 1220F (-100C to 500C)
Operating

< 85% RH
Humidity
Power

Approximately 10mA DC
consumption
Weight 6.7 oz. (190g) including battery
Dimensions 7.2 x 2.5 x 1.4” (183 x 63.6 x 35.6mm) (HWD)
Jaw opening 0.9” (23mm)
Standards IEC 1010 Category III 300V, Category II 600V

2.2 Range Specifications

Function Range Resolution Accuracy Overload protect

AC Power

40kW 10W ±1.5% ±3dgts See note

Note 50/60Hz, 0-250V, 0-400A, PF 0-1,

Vpeak < 360V

240kW 100W ±1.5% ±3dgts See note

Note 50/60Hz, 0-600V, 0-400A, PF 0-1,

Vpeak < 850V

40kW 10W ±2.5% ±3dgts See note

Note 40Hz – 1KHz, 0-250V, 0-400A, PF 0-1,

Vpeak < 360V

240kW 100W ±2.5% ±3dgts See note

Note 40Hz – 1KHz ,0-600V, 0-400A, PF 0-1,

Vpeak < 850V

DC Power

40kW 10W ±1.5% ±3dgts 0-250V, 0-400A
240kW 100W ±1.5% ±3dgts

DC Current
AC Current

DC Voltage
AC Voltage

400A 10mA ±1.5% ±3dgts 600A DC
50/60Hz 40 – 1kHZ
400A 100mA ±1.5%

±3dgts

±2.5%

±4dgts

600A AC

400V 0.1V ±1.0% ±2dgts 800V DC
50/60Hz 40 to

1kHz

Frequency

600V 1V ±1.5%

±2dgts
100 to
1000k

0.01Hz ±0.8%
±2dgts

±2.0%

800V AC

±4dgts

Sens. 10V 600V AC

2 380940es Ver. 1.02 11/99