Extech EX450 Digital-Multimeter, DMM, 2,000 counts EX450 Data Sheet

EX450-EU_ENG       V3.1    10/07 

13 

200

Ω 0.1Ω 

±(0.8% reading + 4 digits) 

2k

Ω 0.001kΩ 

±(0.8% reading + 2 digits) 

20k

Ω 0.01kΩ 

200k

Ω 0.1kΩ 

2M

Ω 0.001MΩ 

±(1.0% reading + 2 digits) 

Resistance 

20M

Ω 0.01MΩ 

±(3.0% reading + 5 digits) 

-58 to 518

°F 1°F 

Temp 
(IR) 

-50 to270

°C 1°C 

±2.0% reading  or ±2°C, ± 4 °F  

NOTE: Accuracy specifications consist of two elements: 
• (% reading) – This is the accuracy of the measurement circuit. 

• (+ digits) – This is the accuracy of the analog to digital converter. 

Diode Test 

Test current of 0.3mA maximum, open circuit voltage 1.5V DC 
typical 

Continuity Check 

Audible signal will sound if the resistance is less than 150

Ω 

(approx.), test current <0.7mA 

6 to 16µm 

0.95 fixed 

8:1 

Input Impedance >7.5MΩ (VDC & VAC) 
AC Response 

Average responding 

50Hz to 1kHz 

2000 count backlit liquid crystal 

Overrange indication 

“OL” is displayed 

15 minutes (approximately) 

Polarity 

Automatic (no indication for positive); Minus (-) sign for 
negative  

2 times per second, nominal 

“     ” is displayed if battery voltage drops below operating 
voltage 

Patent notice U.S. 

Patent 

7056012