10 Scope Mode
Narda SRM-3006 125
10.3 Setting the measurement parameters
The parameters described in Table 31 must be set to match the service
being measured to obtain meaningful results. Some examples of services
and the appropriate settings of these parameters are also given below.
Fcent:
⇒ Press the Fcent softkey and enter the desired values. You can
alternatively select the center frequency and bandwidth in
Spectrum Analysis mode and keep these parameter settings by
switching to Scope mode using Extras/Scope (see Changing operating
mode and keeping the same parameters on page 91).
Sweep Time, Time Resolution:
1. Press the Sweep Time softkey.
ª Entry is in seconds by default.
2. Enter the desired time. This can be done in the following ways:
– Keys: Type in a value using the numerical keys and select the units
using the softkeys.
–
Rotary control + arrow keys:
Change the value with the rotary control:
To increase:
Keep turning the rotary control or use the
key to select a
higher value digit and then use the rotary control to change the value.
(Additional digits can be displayed using the
key. The starting value is
always “0”, e.g. 0 028 s).
To decrease:
Keep turning the rotary control or use the key to select
a lower value digit and then use the rotary control to change the value.
Press the key when a digit reaches “0”. You can then decrease the
value further.
– Entry in hh:mm:ss format: Press the Mode softkey. Select a section
using the keys and change the value using the rotary control.
3. Press the Time Resolution softkey and enter the time in the same way.
4. Press OK to complete entry.
Table 31: Measurement parameters and their functions
Parameter Function / Setting
Fcent Center frequency of channel under observation
Sweep Time
Measurement duration, e.g. total time for the channels of a service
Time Resolution Sweep Time divided by no of pixels in display (600)
RBW Resolution bandwidth (e.g. channel bandwidth)
Axis • Single axis (X, Y, Z): with short sweep time for displaying
individual channels
• Isotropic: for long-term measurements
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