User`s guide

Characteristics and Specifications 5
Electrical Specifications
U1273A/U1273AX User’s Guide 151
Decibel (dB) specifications
Decibel (dBV) accuracy specifications
Table 5-17 Decibel specifications
dB base Reference Default reference
1 mW (dBm) 1 Ω to 9999 Ω 50 Ω
1 V (dBV) 1 V 1 V
Notes for decibel specifications:
1 The reading of dBm is indicated in decibels of power above or below 1 mW, or decibels of voltage above or below 1 V. The
formula is calculated according to the voltage measurement and specified reference impedance. Its accuracy is
depended on the accuracy of the voltage measurement. See Ta b l e 5 - 1 8.
2 Auto-ranging mode is used.
3 The bandwidth is according to voltage measurements.
Table 5-18 Decibel accuracy specifications for DC voltage measurements
Range
dBV range Accuracy
Minimum Maximum
45 Hz to
65 Hz
20 Hz to
45 Hz
1 kHz to
5 kHz
5 kHz to
20 kHz
20 kHz to
100 kHz
65 Hz to
1 kHz
30 mV –56.48 –30.46 0.06 0.07 0.09 0.1 0.32
300 mV –36.48 –10.46 0.06 0.07 0.09 0.1 0.32
3 V –16.48 +9.54 0.06 0.09 0.14 0.19 0.32
30 V +3.52 +29.54 0.06 0.09 0.14 0.19 0.32
300 V +23.52 +49.54 0.06 0.09 0.14 0.19 -
1000 V +33.98 +60 0.06 0.09 0.14 - -