184 Chapter 2a
Making Adjustments: If 3335A Source Not Available
6a. Cal Attenuator Error
34.The 8 dB attenuator step error is the MKR ∆ reading minus the
error in the 1 dB step attenuator when set to 9 dB and 1 dB in Table
2a-1.
8 dB atten step error =
Analyzer MKR ∆ - (9dB atten error - 1 dB atten error)
35.Enter the 8 dB attenuator step error in Table 2a-2.
Entering Attenuator Error Correction Data
36.Press the following analyzer keys.
PRESET
75 Ω input only: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm
FREQUENCY, −2001, Hz
CAL, More 1 of 4, More 2 of 4
SERVICE CAL, SET ATTN ERROR
Note that the frequency of −2001 Hz is necessary to access the
SERVICE CAL routines.
37.When the analyzer prompts you with the message
ENTER CAL ATTEN ERROR, enter the data from Table 2a-2 and
terminate with the reverse sign using the
dBm or −dBm keys. For
example, if the error recorded in Table 2a-2 is 0.07, enter 0.07 and
terminate with
−dBm.
38.When the analyzer prompts you to enter the 16 dB step, enter
0 dBm. At the completion of entering the 16 dB error, the analyzer
will reset.
Table 2a-2 A12 Amplitude Control Assembly Attenuator Errors
1 dB Step Attenuator
Setting (dB)
Reference Level Settings
(dBm)
Attenuator
Step (dB)
Error
OFF ON OFF ON
9 8−18 −17 1
7 5 −16 −14 2
84−17 −13 4
91−18 −10 8
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