Datasheet
Page 7
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Zero drift and measurement noise
Conditions (RH)
1
Zero drift
2, 3
Measurement noise
2, 4
up to 70% ± 5.5 nW ± 45 nW
1. RH is the abbreviation for relative humidity.
2. Zero drift and measurement noise specifications are tested at 50 MHz.
3. Within 1 hour of warm up and after zeroing, at a constant temperature, taken over a period of 4 hours
of the total measurement time. This drift is calculated based on the average of hourly drifts.
4. The number of averages at 16 for the normal mode, 32 for the ×2 mode, and 512 for the fast mode,
at a constant temperature, measured over a 1-minute interval and two standard deviations.
Noise multiplier
Number of averages 1 2 4 8 16 32 64 128 256 512 1024
Normal mode 3.17 2.62 2.02 1.54 1.00 0.82 0.60 0.50 0.37 0.27 0.15
×2 mode 4.55 3.76 3.00 2.25 1.59 1.00 0.85 0.63 0.47 0.42 0.23
Fast mode 46.88 33.06 24.00 17.19 12.24 8.39 4.93 4.11 2.48 1.00 0.83
Measurement rate
Measurement speed mode Measurement speed
Normal 20 readings/s
Double 40 readings/s
Fast
1
900 readings/s
2
1. To reduce sensor-dependent delay time, use the measurement buffer by setting the trigger count > 1.
2. The measurement is taken with the averaging state set to off.
Settling time
Number of averages 1 2 4 8 16 32 64 128 256 512 1024
Settling time(s) (Normal mode)
1
0.10 0.15 0.25 0.45 0.85 1.63 3.20 6.36 12.6 25.2 50.4
Settling time(s) (×2 mode)
1
0.08 0.10 0.15 0.25 0.45 0.89 1.63 3.20 6.35 12.6 25.2
Settling time(s) (Fast mode)
1,2
0.003 0.005 0.007 0.011 0.020 0.036 0.069 0.134 0.265 0.528 1.053
1. Manual filter, 10 dB decreasing power step.
2. Noise measurement in fast mode fluctuates at lower power. Although the averaging count (filter) is initially set to 256, if any of the 256 measurement
samples taken are higher than –30 dBm, the firmware automatically changes the averaging count to 128.
Figure 8. Auto-filter, default resolution, 10 dB decreasing power step
Normal mode
Maximum power
150 ms 20 dB
Typical
250 ms 10 dB
Dynamic
settling range
times
840 ms 10 dB
6.36 s 10 dB
12.6 s 5 dB
Minimum power
x2 mode
Maximum power
100 ms 20 dB
Typical
150 ms 10 dB
Dynamic
settling range
times
450 ms 10 dB
3.20 s 10 dB
6.35 s 5 dB
Minimum power
Fast mode
Maximum power
5 ms 20 dB
Typical
7 ms 10 dB
Dynamic
settling range
times
20 ms 10 dB
124 ms 10 dB
265 ms 5 dB
Minimum power