Sensor Menu Front Panel Operation
5-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
NUMBER [AVG AVGM]
Sweep averaging number (1 to 512).
REPEAT averaging also allows the user to manually select the amount of averaging
regardless of the signal level, however the display is updated only when the NUMBER
of readings specified have been taken (1-512).
LOW LEVEL [AVGLL]
Select OFF, LOW, MEDIUM, or HIGH, Low Level Averaging, in Power vs. Time or
Readout modes. Sets the low level averaging window for the sensor. At resolution
settings of 0.01 and 0.001 dB, digital readouts may flicker due to the high reading rate
of the power meter. Low level averaging applies a low pass filter to post-average data
readings to achieve a more stable front panel display without slowing down the
response of the meter to larger changes in level. The three windows for LOW, MEDIUM
and HIGH low level averaging are ± 0.01, 0.02, and 0.05 dB.
For example: When a LOW setting of low level averaging is applied while stepping from
0 dBm to –1 dBm, the meter displays the final reading within 0.01 dB with no delay.
The final settling of 0.01 dB will settle over a short subsequent period of time, leading
to a stable high resolution readout.
With a HIGH setting of low level averaging, the settling window is increased (up to
approximately 0.05 dB) and the settling time is longer.
With low level averaging OFF, the meter displays the final reading instantly with no
further settling observed. Any jitter due to noise is reflected in the displayed reading,
which may be inconvenient for high resolution readings.
In Profile and Source sweep modes, the following soft keys appear:
STATE [GRSWS]
Graph averaging state, ON or OFF. When set to ON, the following additional soft keys
appear:
A NUMBER [GRSWP]
B NUMBER (ML2438A only) [GRSWP]
Sweep averaging number (1 to 512).
Note
Due to the nature of this method of operation, if the power level changes between
updates, the display update will not reflect the true input power for one
measurement only.
When a channel is set to a ratio, e.g., A–B or A/B etc., the repeat method
described above only operates if all sensors are set to the REPEAT mode.
Note
GPIB trigger commands automatically apply REPEAT averaging after TR2
commands to ensure ‘old’ samples are excluded from the measurement. However,
the user should be aware that due to the high speed of the meter, other
instruments in the ATE system may not be settled.
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