TB 9-4931-406-40
(2) Set calibrator to negative, wait 30 seconds and annotate the average of 10
(3) Set calibrator to STBY and disconnect from tee input.
(4) Immediately connect RF reference source output to tee input and apply voltage
as appropriate at reference frequency (1 kHz or 400 Hz) to bring observed mV indications of
multimeter connected to standard thermal converter output to within 0.1 mV of indication
when DC voltage was applied.
(5) Wait 30 seconds and annotate the average of 10 readings of multimeter
connected to standard thermal converter output as mVac.
(6) Set RF reference source output to off without disturbing amplitude setting.
(7) Calculate the absolute value of standard thermal converter AC voltage output at
1 -
1+
=
reference frequency using the following formula:
.8
+
Where:
Vdc is nominal voltage (1 V, 3 V etc).
mVac obtained in (5) above.
mVdc = (mVdcpos + mVdcneg)/2.
Dstd = AC/DC difference of standard thermal converter
from the test report.
(8) Without varying RF reference source output level established in (4) above, turn
RF reference source output to on and change RF reference source output frequency to test
frequency point.
(9) Wait 30 seconds and annotate the average of 10 readings of multimeter
connected to standard thermal converter output as mVstd and annotate the average of 10
readings of multimeter connected to TI output as mVTI.
(10) Change RF reference source output frequency back to reference frequency.
(11) Wait 30 seconds and annotate the average of 10 readings of multimeter
connected to standard thermal converter output as refmVstd and annotate the average of 10
readings of multimeter connected to TI output as refmVTI.
(12) Calculate the absolute value of standard thermal converter AC voltage output at
1
-
test frequency using the following formula:
=
1+
.8
+
5
