Preamp, Offset, Units – Bird Technologies SH-36S-RM-Manual User Manual
Page 58: Trace, Preamp offset units trace, Clear write max hold
Bird Technologies
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Preamp
Controls the built-in amplifier on the signal input. This lowers the noise
floor, allowing very low power signals be detected, by giving a 24 dB
nominal gain boost.
Note:
Attenuation is automatically disabled to 0 when
Preamp is activated.
Note:
The preamp should not be used with input signals
greater than -30 dBm.
Offset
Shifts the signal to compensate for external factors (attenuation, cou-
plers, amplifiers, etc.) This allows for a true signal level reading.
1. Measure the total amount of loss for all attached signal devices.
2. Enter the measured amount as the Offset value or gain.
Example - The system has 10 dB of loss due the use of a coupler;
enter the value of 10 in the Offset. Offset range is -100 to +100.
Units
dBm
dBuV
dBmV
dBV
Volts
Watts
Trace
Opens a trace submenu with the following options:
Clear Write
Switches off the Average and Max Hold functions.
Max Hold
Holds and displays the highest point of a any given sweep until Max
Hold is turned off.
dBm
10
Log Power Watts
(
)
[
] 30dB
+
×
=
dBm
dBuV
10∗
50
log
(
) 90
–
–
=
dBm
dBmV
10∗
50
log
30
–
(
)
–
=
dBm
dBV
10∗
50
log
30
+
(
)
–
=
dBm
20
Log Power Volts
(
)
[
]
×
=
30dB
+
Watts
10Λ dBm
30
–
(
) 10
⁄
(
)
=