Atec Agilent-EPM Series - Manual (Page 13)

13
E-Series CW Power Sensor Specifications (continued)
Power linearity
Table 6. E4410 Series power linearity specification
Power Temperature (25 °C ±5 °C) Temperature (0 °C to 55 °C)
100 pW to 10 mW (–70 dBm to +10 dBm) ±3% ±7%
10 mW to 100 mW (+10 dBm to +20 dBm) ±4.5% ±10%
+20
+10
+6
–20
–35
–70
±4%
+3%
A
B
–70 –35 –20 –10 +10 +20
Power level used as reference (dBm)
Power level being measured (dBm)
Figure 1. Relative mode power measurement linearity with EPM Series power
meter/E-Series CW power sensor at 25 °C ± 5 °C (typical)
The chart in Figure 1 shows the typi-
cal uncertainty in making a relative
power measurement, using the same
power meter channel and the same
power sensor to obtain the reference
and the measured values. Example
A illustrates a relative gain (amplifier
measurement). Example B illustrates
a relative loss (insertion loss
measurement). This chart assumes
negligible change in frequency and
mismatch occur when transitioning
from the power level used as the
reference to the power level being
measured.
Example A:
P = 10(P)/10 x 1 mW
P = 10 6/10 x 1 mW
P = 3.98 mW
3% x 3.98 mW = 119.4 μW
Example B:
P = 10 (P)/10 x1 mW
P = 10 –35/10 x 1 mW
P = 316 nW
3% x 316 nW = 9.48 nW
where
P = power in Watts
and
(P) = power in dBm