Models PH – Power Heads
6.3 WORKSHEET
Source of Error
Value %
Value %
(See Note 2)
Comments
Instrumentation (See Note 1)
Includes zeroing error
Power Reference (See Note 2)
Calibration Factor (See Note 3)
Frequency dependent
Mismatch (See Note 3)
Frequency dependent (based on SWR of head and source)
Noise (See Note 4)
Level dependent – More critical at lower levels
Linearity (Shaping)
Power and frequency dependent
Temperature (See Note 5)
Pulse Accuracy
Only add if measuring pulsed RF signals
TOTAL
Sum or Squares
%
Total RSS Uncertainty
NOTES:
1.
Worst case instrumentation accuracy for the AR RF Power Meters (PM2002)
0.23% at fs
0.46% at 1/10 fs
2.
If 50 MHz, 0 dB power reference is used, uncertainty is 1.20% (worst case).
3.
Mismatch uncertainty (%)=[(1 ± p head x p source) x 100
4.
Noise uncertainty(%)=(signal level/noise specification) x 100
5.
Additional uncertainty due to temperature drift can be compensated for through the use of
autocalibration.
SWR+1
P=
SWR-1
22
Rev C
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