Dual input meter
The accuracy of all measurements is within (% of reading + number of counts) from 18 °C to 28 °C.
Add 0.1x (specific accuracy) for each °C below 18 °C or above 28 °C. For voltage measurements with 10:1 probe, add probe
uncertainty +1 %. More than one waveform period must be visible on the screen.
Input A and input B
DC voltage (VDC)
Ranges
500 mV, 5 V, 50 V, 500 V, 750 V
(0.5 % +5 counts)
Accuracy
Common mode rejection (CMRR)
Full scale reading
>100 dB @ dc, >60 dB @ 50, 60, or 400 Hz
5000 counts
True-rms voltages (V ac and V ac+dc)
Ranges
500 mV, 5 V, 50 V, 500 V, 750 V
Accuracy for 5 % to 100 % of
range (DC coupled)
DC to 60 Hz (V ac+dc)
1 Hz to 60 Hz (V ac)
60 Hz to 20 kHz
(1 % +10 counts)
(1 % +10 counts)
(2.5 % +15 counts)
Accuracy for 5 % to 100 % of
range (AC or dc coupled)
DC rejection (only VAC)
>50 dB
Common mode rejection (CMRR)
>100 dB @ dc
>60 dB @ 50, 60, or 400 Hz
Full scale reading
Peak
5000 counts, reading is independent of any signal crest factor.
Modes
Max peak, Min peak, or pk-to-pk
500 mV, 5 V, 50 V, 500 V, 2200 V
Ranges
Accuracy
Accuracy Max peak or Min peak
Accuracy Peak-to-Peak
500 counts
5 % of full scale
10 % of full scale
Full scale reading
Frequency (Hz)
Ranges
123B: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz,1 MHz, 10 MHz, and 50 MHz
124B and 125B: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz, 10 MHz, and 70 MHz
15 Hz (1 Hz) to 50 MHz in continuous autoset
Frequency range
Accuracy @1 Hz to 1 MHz
Full scale reading
RPM
(0.5 % +2 counts)
10 000 counts
Max reading
50.00 kRPM
Accuracy
(0.5 % +2 counts)
Duty cycle (PULSE)
Range
2 % to 98 %
Frequency range
Pulse width (PULSE)
Frequency range
15 Hz (1 Hz) to 30 MHz in continuous autoset
15 Hz (1 Hz) to 30 MHz in continuous autoset
1000 counts
Full scale reading
Amperes (AMP)
With current clamp
Ranges
same as V dc, V ac, V ac+dc, or PEAK
Scale factors
0.1 mV/A, 1 mV/A, 10 mV/A, 100 mV/A, 400 mV/A,
1 V/A, 10 mV/mA
Accuracy
same as V dc, V ac, V ac+dc, or PEAK
(add current clamp uncertainty)
6 Fluke Corporation Fluke 120B Series Industrial ScopeMeter® Hand-Held Oscilloscopes