N1914A Datasheet, PDF (14/28 Pages) Keysight Technologies – EPM Series Power Meters E-Series and 8480 Series Power Sensors

14 | Keysight | N1913A and N1914A EPM Series Power Meters / E-Series and 8480 Series Power Sensors - Data Sheet
E-Series CW Power Sensor Specifications (continued)
Power linearity
Table 6. E4410 Series power linearity specification
Power
100 pW to 10 mW (–70 dBm to +10 dBm)
10 mW to 100 mW (+10 dBm to +20 dBm)
Temperature (25 °C ± 5 °C)
± 3%
± 4.5%
Temperature (0 °C to 55 °C)
± 7%
± 10%
The chart in Figure 1 shows the typical
+20
uncertainty in making a relative power
measurement, using the same power
+10
meter channel and the same power sensor
to obtain the reference and the measured
+6
values. Example A illustrates a relative
gain (amplifier measurement). Example
–20
B illustrates a relative loss (insertion
loss measurement). This chart assumes
negligible change in frequency and
mismatch occur when transitioning from
–35
the power level used as the reference to
the power level being measured.
± 4%
A
+3%
B
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
–70
–70
–35
–20 –10
Power level used as reference (dBm)
+10 +20
Figure 1. Relative mode power measurement linearity with EPM Series power meter/E-Series CW
power sensor at 25 °C ± 5 °C (typical)
where
P = power in Watts
and
(P) = power in dBm