68 Chapter 3
Making Measurements
Frequency Counter Measurement
default number is 25 when switching to On. When the input signal is changed
during the average period, wait until the averaging is done or the next
averaging period starts.
4. To change the average mode, toggle the
Avg Mode key between Exp and
Repeat. The default average mode is Repeat.
5. To change the RBW, press the
RBW key and enter the bandwidth value and
unit. The default setting is
1 kHz.
Step 7. You can adjust the display by pressing
AMPLITUE/Y Scale, then:
1. Press the
Display Unit key and select a display unit key, like MHz. The default
setting is
Hz.
2. Press the
Display Mode key to toggle between Normal and Ratio. The default
setting is
Normal.
3. Press the
Ratio Ref key to toggle between Auto and Man. When you select Man,
input the reference frequency value and unit. When the reference is set to 0 or
the measurement result is 0 under log ratio mode, the result displayed is “- -
-”.
4. Press the
Ratio Mode key to toggle between Log and Linear.
NOTE For Model E4440A, E4443A and E4445A, the PSA is set from DC coupling to AC
coupling when searching signals above 100 MHz using Auto tuning. If no signal is
found with full span search, press
Preset to reset to DC coupling for a new search
under 100 MHz.
For Model E4446A, E4447A and E4448A, the PSA is always set to DC coupling.
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