Maintenance
28
Bird 4028B Series RF Power Sensors
Frequency Range
4028B10M 10 – 15 MHz
RF Power Range 1 kW – 25 kW
Accuracy, Fwd, Best Case
*
* For rated accuracy, no more than 1% AM; Harmonics –50 dBc or less
Derate accuracy by 2% (2σ) outside cal. power or cal. frequency
Derate accuracy by 2% (2
σ) below 15 °C and above 35 °C
± 2.0% (2σ)
Accuracy, Reflected Calculated from FWD accuracy and FWD power
Accuracy, VSWR Calculated from FWD and RFL power
Calibration Frequencies,
Typical (MHz)
†
4028B10M
† Other calibration frequencies available upon request
10.0, 13.56, 15.0
Calibration Power, Typical 3.5 kW
VSWR, Max. 1.05:1
Insertion Loss, Max. 0.05 dB
Directivity, Min. 28 dB
Impedance, Nominal 50 ohms
VSWR Range 1.00 to 2.00 (40.0 to 9.5 dB Return Loss)
Max. Allowable Terminating
VSWR
2.00:1
Calibration Technique Calibration vs. frequency curve stored in nonvolatile
memory in each sensor. Sensor output corrected at
frequency of measurement within rated range.
Sampling Rate, Nominal 2 readings/second
Operating Power Supplied by power meter via sensor cable
Dimensions, Nominal 6.75”L x 3.5”W x 4.75”H (175 x 89 x 121 mm)
Weight, Nominal 5 lb. 2 oz. (2.33 kg)
RFL Accuracy FWD Accuracy
FWD Power
10
Directivity 10/
---------------------------------+=
VSWR 1
P
R
P
F
------+
⎝⎠
⎜⎟
⎛⎞
1
P
R
P
F
------–
⎝⎠
⎜⎟
⎛⎞
⁄=
