TB 9-6625-2308-35
Table 3. Linearity Data - (+16 dBm to +20 dBm) - Continued
1.00
40
dB
P1 =
R1 =
P1/P2 =
R1/R2 =
0.025
10.00
1%
P2 =
R2 =
0.25
1.00
50 dB
P1 =
R1 =
P1/P2 =
R1/R2 =
0.025
10.00
1%
P2 =
R2 =
0.25
1.00
P1 =
60 dB
R1 =
P1/P2 =
R1/R2 =
0.025
2
10.00
1.5%
P2 =
R2 =
0.25
1Before continuing on to next attenuator setting, re-zero TI sensor by pressing [CAL], [ZERO SENSOR], [the appropriate
sensor] keys. When the TI chimes, press [MEAS], [DISP], [UNITS] keys and ensure display units are set to LINEAR.
2Increase TI AVG to 8. If TI reading still is unstable, increase AVG to 16 or 32.
(8) Disconnect the multimeter negative lead from the VRF connector on the rear
panel of the power meter and connect it to chassis ground. Record this voltage as VCOMP.
(9) Calculate that actual power using the formula listed below and record as P1 on
2VCOMP (V1-V0) +V02-V12
PCAL =
Where:
=
calibrator output power level
PCAL
=
value recorded in (9) above
VCOMP
=
value recorded in (8) above
V1
=
value recorded in (6) above
V0
R
=
value recorded in 7 d above (≈ 200 Ω)
=
value of thermistor mount at 50 MHz
(10) Connect the positive and negative leads to the VCOMP and VRF connectors
respectively on the rear panel of the power meter.
(11) Fine zero the power meter and set power meter RANGE switch to 10 mW.
(12) Record the multimeter indication as V0.
(13) Set the signal generator output to 50 MHz and level to 3.98 mW as indicated on
the power meter.
(14) Record multimeter reading as V1. Record TI reading as R2 on table 3.
(15) Disconnect the multimeter negative lead from the VRF connector on the rear
panel of the power meter and connect it to chassis ground. Record this voltage as VCOMP.
(16) Calculate that actual power using the formula listed below and record as P2 on
(17) Repeat the technique of (4) through (16) above for the remaining entries on
(18) Calculate the linearity error (%) and accumulated linearity error using the
formulas listed below and record in the appropriate blocks in table 3.
10