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Decibel (dB) for U1272A

[1] - [3]

dB base Reference Default reference

1 mW (dBm) 1 to 9999 Ω 50 Ω

1 V(dBV) 1 V 1 V

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 Decibel (dBV) accuracy table below.

2. Auto-ranging mode is used.

3. The bandwidth is according to voltage measurement.

Decibel (dBV) accuracy

Range

dBV range Accuracy

Minimum Maximum 45 to 65 Hz

20 Hz to

1 kHz

1 Hz to

5 kHz

5 kHz to

20 kHz

20 Hz to

100 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 - -

Measurement rate (approximate)

Function

Times/second

U1271A U1272A

ACV 7 7

DCV 7 7

Ω1414

Ω with offset compensation - 3

Diode 14 14

Auto Diode - 3

Capacitance 4 (<100 µF) 4 (<100 µF)

DCI 7 7

ACI 7 7

Temperature 7 7

Frequency 2 (>10 Hz) 2 (>10 Hz)

Duty cycle 1 (>10 Hz) 1 (>10 Hz)

Pulse width 1 (>10 Hz) 1 (>10 Hz)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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