Chapter 2a 181
Making Adjustments: If 3335A Source Not Available
6a. Cal Attenuator Error
Procedure
The accuracy of the amplitude control attenuator is critical to the
proper calibration of the instrument; therefore, this procedure must be
carefully and accurately performed.
1. Connect the equipment as shown in Figure 2a-1. The 75 Ω RF input
requires an external pad as shown in Figure 2a-1.
2. Set the frequency of the synthesized signal generator to 200 MHz
and the amplitude to -10dBm.
3. Set the external 1 dB step attenuator to 9 dB.
4. To turn the cal attenuator corrections off, press the following
analyzer keys.
PRESET
CAL, More 1 of 4
CORRECT ON OFF (OFF)
1 dB Step Check
5. To measure the 1 dB step correction, press the following analyzer
keys.
FREQUENCY, 200, MHz
SPAN, 10, MHz
AMPLITUDE, 18, −dBm
SCALE LOG LIN (LIN), More 1 of 2
AMPTD UNITS, dBm
PEAK SEARCH
MKR FCTN, MK TRACK ON OFF (ON)
SPAN, 50, kHz
BW, 3, kHz
VID BW AUTO MAN, 300, Hz
75 Ω input: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm
6. Press the following analyzer keys.
PEAK SEARCH, MARKER DELTA
MKR FCTN, MK TRACK ON OFF (ON)
7. The MKR ∆ amplitude reading should be 0.0 dB ±0.01 dB. If it is not,
repeat step 5.
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