Power Level
Accuracy Test
Procedure
Power level accuracy is checked by stepping the
power down in 1 dB increments from its maximum
rated power level.
Step 1 Set up the 681XXC as follows:
a. Reset the instrument by pressing
SYSTEM , then Reset . The CW
Menu (below) is displayed.
b. Press Edit F1 to open the current fre-
quency parameter for editing.
c. Set F1 to the CW frequency noted on
the test record for the model being
tested.
d. Press Edit L1 to open the current
power level parameter for editing.
e. Set L1 to the power level noted on the
test record.
Step 2 Measure the output power level with the
Power Meter and record the reading on
the test record.
Step 3 Verifythat the Power Meter reading
meets the specifications stated on the test
record.
Step 4 Set L1 to the next test power level. Re-
cord the Power Meter reading on the test
record.
Step 5 Repeat step 4 for the other levels listed on
the test record for the current CW fre-
quency.
Step 6 Repeat steps 1 thru 5 for all CW frequen-
cies listed on the test record.
5-14 681XXC OM
OPERATION POWER LEVEL ACCURACY
VERIFICATION AND FLATNESS TESTS
NOTE
Inmodels with Option 22 that have
a high-end frequency of £20 GHz,
rated output power is reduced by
1dB. In models with Option 22 that
have a high-end frequency of
>20 GHz, rated output power is re-
duced by 2 dB.