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Chapter 1 General Information
Specifications are valid when the unit is calibrated at ambient temperature after a 5 minute
warmup.
Description
Value
Site Master: Frequency Range:
S251B 625 to 2500 MHz
Frequency Accuracy (RF Source Mode): 75 parts per million @ 25°C*
Frequency Resolution: 10 kHz
SWR:
Range
Resolution
1.00 to 65.00
0.01
Return Loss:
Range
Resolution
0.00 to 54.00 dB
0.01 dB
**Distance-To-Fault (DTF):
Range (in meters)
Resolution (in meters)
(Rectangular Windowing)
0 to (Resolution x dp)
(. )( )15 10
8
´ V
F
f
D
Where V
f
is the relative propagation velocity of
the cable .
dp is the number of data points (128, 256,
512).
DF is F2 - F1 (in Hz.)
Insertion Loss/Gain
Range:
Resolution
RF Source
Frequency
Power Output (nominal)
Wattmeter Power Monitor:
Range
Offset Range
Resolution
–120.00 to 100.00 dB
0.01 dB
625 to 2500 MHz @ 10 kHz step
selectable, – 30 dBm or+6dBm
–80.0 to +80 dBm or
10.0 pW to 100.0 kW
0 to +60.0 dB
0.1 dB or
0.1 xW
Test Port, Type N 50 Ohms
***Immunity to Interfering signals
up to the level of: RF Out
RF In
+10 dBm, reflection
+ 30 dBc transmission
Maximum Input (Damage Level):
Test Port, Type N
RF Detector
+22 dBm
+20 dBm
Measurement Accuracy:
Measurement accuracy depends on calibration components. Precision calibration load provides
a corrected directivity of 42 dB.
Cable Insertion Loss:
Range
Resolution
0.00 to 54.00 dB
0.01 dB
Table 1-1. Performance Specifications (1 of 2)