User Manual

5 Technical data
4
5 Technical data
Voltage testing
Figures correspond to +23 °C ± 5 °C at <80% rel. humidity. Temperature
coefficient: 0.15 x specified accuracy per 1 °C (<18 °C and >28 °C).
Feature Values
Voltage range testo 755-1: 6 - 600 V AC/DC
testo 755-2: 6 - 1000 V AC/DC
Resolution 0.1 V
Tolerance 6 to 49.9 V: ± (1.5% of the display value + 5
digits)
50 to 600 V / 1000 V: ± (1.5% of the display
value + 3 digits)
Frequency range DC voltage, 14 Hz – 400 Hz
Acoustic
signalling
 50 V AC,  120 V DC
Voltage detection Automatic
Polarity detection Automatic
Range detection Automatic
Internal load Approx. 3.5 W at 1000 V
Current Is < 3.5 mA at 1000 V
Operating time 30 s
Recovery time 240 s
Automatic power on > 6 V
Reading memory (HOLD) testo 755-1: 6 - 600 V AC/DC
testo 755-2: 6 - 1000 V AC/DC
Overload indicator testo 755-1: > = 630 V AC/DC, LC display
shows OL
testo 755-2: > = 1050 V AC/DC, LC display
shows OL
Measurement category CAT III 1000 V / CAT IV 600 V
Single pole phase testing (only testo 755-2)
Feature Values
Voltage range >90 to 690 V ± 10% AC voltage to earth
Frequency range 50/60 Hz
Acoustic
signalling
Yes
LED display Warning symbol
Rotating magnetic field detection (only testo 755-2)
Feature Values
Voltage range 100 to 400 V ± 10% phase to earth/neutral
Frequency range 50/60 Hz
LC display L and R