Datasheet

Page 10
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Noise and drift
U2041/42/43/44/49XA
Mode VBW setting Zero set
1
Zero drift
2
Measurement noise Noise per sample
External zero Internal zero
Normal
3
LOW/MED ± 16 nW ± 23 nW ± 10 nW ± 10 nW
4
± 0.15 µW
HIGH/OFF ± 50 nW ± 60 nW ± 15 nW ± 32 nW
4
± 0.8 µW
Average – ± 100 pW for < 300 MHz ± 1 nW ± 25 pW ± 80 pW
5
—
± 70 pW for >= 300 MHz
1. After 1 hour of warm up and at a constant temperature.
2. After 1 hour of warm up and at a constant temperature, measurements taken over a period of 4 hours after zeroing. Drift is calculated based on the average
difference of any two measurements 1 hour apart.
3. Only applicable to U2042/44/49XA.
4. Noise defined for 1 average at free run mode.
5. Noise defined for 16 averages at 50 ms aperture.
U2053/63 and L2051/52/53/61/62/63XA
Mode VBW setting Zero set
1
Zero drift
2
Measurement noise Noise per sample
External zero Internal zero
Normal
3
LOW/MED ± 12 nW ± 15 nW ± 10 nW ± 10 nW
4
± 0.15 µW
HIGH/OFF ± 27 nW ± 30 nW ± 15 nW ± 32 nW
4
± 0.8 µW
Average – ± 90 pW for < 300 MHz ± 1 nW ± 25 pW ± 80 pW
5
—
± 70 pW for >= 300 MHz
1. After 1 hour of warm up and at a constant temperature.
2. After 1 hour of warm up and at a constant temperature, measurements taken over a period of 4 hours after zeroing. Drift is calculated based on the average
difference of any two measurements 1 hour apart.
3. Only applicable to U2063 and L2061/62/63XA.
4. Noise defined for 1 average at free run mode.
5. Noise defined for 16 averages at 50 ms aperture.
Specifications (Continued)