Escort 3136A Operation Manual page 103

dBm (decibel calculation)
Reference Impedance
2Ω
4Ω
8Ω
16Ω
(1)
Reference impedance is selectable at setup mode or during measurement. Please refer
to the chapter for related operation.
(2)
Default reference impedance
Range and Accuracy
Voltage
Input Voltage
(1,2)
Range
500mV 25mV ~ 500mV
5V 500mV ~ 5V
50V 5V ~ 50V
500V 50V ~ 500V
1000V (dc) 500V ~ 1000V
750V (ac) 500V ~ 750V
(1)
Auto-ranging is used when dBm function is selected
(2)
In Vdc 1200V range and Vac 1000 V are readable
(3)
Reading displayed in dB when REL modifier is used
(4)
For input voltage at frequency between 50Hz to 1kHz
(5)
Input Voltage < 200V rms.
• 0dBm: 1 mW @ 600Ω Reference Impedance
• Resolution: 0.01dB for all ranges.
• CMRR: > 90dB for dc signal
• Response Time: Same as dc, ac or ac+dc voltage measurements.
(1)
50Ω
75Ω
93Ω
110Ω
124Ω
125Ω
(3)
dBm Range
@ 600Ω Ref
-29.82 ~ -3.80
-3.80 ~ 16.20
16.20 ~ 36.20
36.20 ~ 56.20
56.20 ~ 62.22
56.20 ~ 59.72
99
135Ω
150Ω
250Ω
300Ω
500Ω
(2)
600Ω
Accuracy (dB)
30 to50 Hz 50 to10k Hz 10k to 100k Hz
0.3 0.3
0.2 0.2
0.2 0.2
(5)
0.2
0.2
Not
(4)
0.2
Specified
800Ω
900Ω
1000Ω
1200Ω
8000Ω
0.7
0.5
0.5
(5)
0.5
Not
Specified