7352 Series Digital Multimeter Operation Manual
5.9.4 dB and dBm Calculations
5-30
5.9.4
dB and dBm Calculations
1. Function
The dB calculation, in which the decibel conversion is accomplished, can be performed only for the
voltage and current measurements.
The dBm calculation, which is useful to calculate the power gain per 1 V, can be performed only for
the voltage measurement.
If the zero is measured while the dB or dBm calculation is performed, the calculation error occurs and
the error message "Err d" is displayed.
Only one calculation can be selected from the dB, dBm, and scaling calculations at a time.
The dB and dBm calculation equations are shown below:
When dB or dBm is selected from the MATH item in
, the dB indicator in the display section
turns on and the calculation is performed.
CAUTION:
The actual measured value is not displayed while the dB or dBm calculation is performed.
Remember that any hazardous voltage present on the input connector or test lead may not be
detected at this time.
2. Setting Constant D
The setting range of Constant D is shown below.
1. Set Constant D in
.
2. After the constant setting mode is enabled by pressing
, the following items,
which blink, can be selected by pressing
and
.
• From the most significant digit to the least significant digit in the numeric
value
Setting range
Minimum setting value
0.00001E -9 to 999999.E + 6
0.00001E - 9
The exponential part is set by using a unit prefix (n,
, m, k, M).
dB: Display = 20 log
10
| Measured value |
Constant D
dBm: Display = 10 log
10
(Measured value)
2
/ Constant D
10
-3
MENU
MENU
CALC
MATH
OFF/dB/dBm/SCL
MENU
MENU
VAL dB
CONST
