± (1.5 % of m.v. + 5 digits)
± (1.5 % of m.v. + 5 digits)
± (2 % of m.v. + 10 digits)
Frequency with
voltage/current
17
99.99 Hz
999.9 Hz
9.999 kHz
Temperature with
adapter
18
-20 to 0 °C ± 2 °C
0 to 99.99 °C ± 1 °C
100 to 249.99 °C ± 1.5 %
>250 °C ± 2 %
Figures correspond to +23 °C ± 5 °C at <80 % rel. humidity. Temperature
coecient: 0.15 x specied accuracy per 1 °C (<18 °C and >28 °C)
9.2.3 testo 770-3 (0590 3770 – as of 2024)
600.0 mV
6.000 V
60.00 V
600.0 V
1000.0 V
0.1 mV
0.001 V
0.01 V
0.1 V
1 V
± (0.5 % of m.v. + 4 digits)
± (0.8 % of m.v. + 5 digits)
6.000 V
60.00 V
600.0 V
1000 V
± (0.9 % of m.v. + 5 digits)
± (1.2 % of m.v. + 5 digits)
Maximum measurement duraon is 13.2 s
Frequency measurement is not specied for alternang currents or voltages below 3% of the
smallest respecve measuring range
Does not include the measurement error of the temperature probe. The specied accuracy is
the sum total of the measurement errors of the thermocouple adapter and the testo 770
The lower measuring ranges are only specied from 5% (does not apply to DC current / AC
current measurements with the current probe)
Signal bandwidth 45 Hz to 1 kHz
In the case of a mixed signal (AC + DC), only the purely AC component is taken into account