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Figure 3-1
Power Measurement
How to Measure Power
T
avg
x
x
Measurements with Tavg ≤ 1 second
With modules designed for the HP 8153A Lightwave Multimeter,
for averaging times of more than 1 second, the displayed power is
given by the formula:
P
new
Where,
P
new
P
old
Sample
T
avg
T
sample
If the measurement condition change (for example, a range change
in automatic ranging), P
This is why the display update seems faster in automatic ranging.
To set the averaging time to 1 second:
1 Move to the Power Meter channel and press the [Details]
softkey.
2 Move to the [A
3 Move to <1 s>, by using the cursor key, and press E
How to Choose the MinMax Mode
MinMax mode measures the incoming power and displays the
minimum value measured, [P
measured, [P
MAX
displayed in place of P, the power value. This mode is intended
81
x
x
x
T
sample
=
P
1
–
------------------ -
old
T
avg
is the new displayed result,
is the previously displayed result,
is the value read by the hardware,
is the averaging time, as set by the user, and
is the time the hardware takes to make a reading.
is reset and the averaging starts again.
old
T
] parameter and press E
VG
IME
], and the maximum value
MIN
]. The difference between these values,
x
x
T
sample
------------------ -
+
Sample
T
avg
.
NTER
NTER
P, is
∆
x
.
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