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Models PH – Power Heads
6.3
WORKSHEET
Source of Error
Instrumentation (See Note 1)
Power Reference (See Note 2)
Calibration Factor (See Note 3)
Mismatch (See Note 3)
Noise (See Note 4)
Linearity (Shaping)
Temperature (See Note 5)
Pulse Accuracy
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
P= SWR-1
SWR+1
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.
22
Value %
Value %
(See Note 2)
Comments
Includes zeroing error
Frequency dependent
Frequency dependent (based on SWR of head and source)
Level dependent – More critical at lower levels
Power and frequency dependent
Only add if measuring pulsed RF signals
TOTAL
Sum or Squares
Total RSS Uncertainty
%
Rev C
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