These menus describe the Custom mode Frequency/Level menus for the Channel Map options: UHF, UHF (Brazil), IF, or None.
 |
Channel Map
Press this submenu key to open the Select Channel Map list box to choose one of four options: UHF, UHF (Brazil), IF, or None. Selecting UHF or UHF (Brazil) displays the Channel submenu key to select a channel and its corresponding frequency.
This submenu key is displayed only when Channel Map is set to UHF. Press this submenu key to open the Channel Editor dialog box. For UHF, the channel range is 13 to 62. For UHF (Brazil), the channel range is 14 to 69. Selection of a channel automatically sets the corresponding frequency.
Auto Reference Level
Press this submenu key to automatically set the reference level at an optimal value. Refer to “Auto Reference Level”.
Reference Level
Press this submenu key to open the Reference Level Editor dialog box to manually select a signal reference value. If the Pre Amp submenu key is On, then the reference level range is from – 10 dBm to – 50 dBm in increments of 10 dB. If the Pre Amp submenu key is Off, then the reference level range is from – 25 dBm to + 20 dBm in increments of 5 dB.
Pre Amp
On Off Press this submenu key to toggle the Pre Amp setting to On and Off. The current state is underlined. When the preamplifier is switched On, the reference level is automatically set to – 30 dBm. When the preamplifier is switched Off, the reference level is set to – 25 dBm. Refer to the Pre Amp Warning.
|
|
The upper limit level, up to which the instrument is not damaged, depends on the preamplifier state.
Preamplifier On: – 10 dBm
Preamplifier Off: + 20 dBm
Switching the preamplifier On, while applying greater than – 10 dBm with preamplifier Off, may damage the internal electronic circuit. Pay attention to the input level when switching the preamplifier On or Off while applying a signal.
|
|
Preamplifier
State |
||
|
– 50 dBm to – 10 dBm
|
10 dB
|
|
|
– 25 dBm to 20 dBm
|
5 dB
|
 |
Channel Map
Press this submenu key to open the Select Channel Map list box to choose one of four options: UHF, UHF (Brazil), IF, or None. Selecting IF sets the frequency to 37.15 MHz, and Spectrum Reverse is automatically turned on.
Auto Reference Level
Press this submenu key to automatically set the reference level at an optimal value. Refer to “Auto Reference Level”.
Reference Level
Press this submenu key to open the Reference Level Editor dialog box to manually select a signal reference value. If the Pre Amp submenu key is On, then the reference level range is from – 10 dBm to – 50 dBm in increments of 10 dB. If the Pre Amp submenu key is Off, then the reference level range is from – 25 dBm to + 20 dBm in increments of 5 dB.
Pre Amp
On Off Press this submenu key to toggle the Pre Amp setting to On and Off. The current state is underlined. When the preamplifier is switched on, the reference level is automatically set to – 30 dBm. When the preamplifier is switched off, the reference level is set to – 25 dBm. Refer to the Pre Amp Warning.
|
 |
Channel Map
Press this submenu key to open the Select Channel Map list box to choose one of four options: UHF, UHF (Brazil), IF, or None. Selecting None displays the Frequency submenu key to allow manually configuring frequency.
This submenu key is displayed only when Channel Map is set to None. Press this submenu key to open the Frequency Edit Dialog box and manually set a frequency within a specified range that is displayed in the window. The submenu key menu displays Units: GHz, MHz, kHz, and Hz.
Auto Reference Level
Press this submenu key to automatically set the reference level at an optimal value. Refer to “Auto Reference Level”.
Reference Level
Press this submenu key to open the Reference Level Editor dialog box to manually select a signal reference value. If the Pre Amp submenu key is On, then the reference level range is from – 10 dBm to – 50 dBm in increments of 10 dB. If the Pre Amp submenu key is Off, then the reference level range is from – 25 dBm to + 20 dBm in increments of 5 dB.
Pre Amp
On Off Press this submenu key to toggle the Pre Amp setting to On and Off. The current state is underlined. When the preamplifier is switched on, the reference level is automatically set to – 30 dBm. When the preamplifier is switched off, the reference level is set to – 25 dBm. Refer to the Pre Amp Warning.
|
The reference level range for input to the instrument is determined by the reference level setting. Immediately after a signal is applied to the instrument, the input attenuator is automatically set according to the reference level. The relationship between the reference level and the input attenuator is fixed.
Raising the reference level increases attenuation of the input attenuator, enabling you to measure signals with higher input levels. Note that the noise floor rises in proportion to the attenuation of the input attenuator.
When applying a signal to the instrument, input a signal level that does not exceed the reference level value. If the signal level exceeds the reference level, raise the reference level. For example, if the signal level is 0.5 dBm with preamplifier off, then set the reference level to 5 dBm, not to 0 dBm.
If an interfering wave other than the intended signal exists, and if the power within the frequency range of approximately 100 kHz to 7.1 GHz is 15 dB or more higher than the measurement signal level, then set the reference level to take the large signal into account.
