Agilent Technologies 8590L Service Manual page 180

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
requires an external pad as shown in
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
1 dB Step Check
5. To measure the 1 dB step correction, press the following analyzer
keys.
, 200,
FREQUENCY
, 10,
SPAN MHz
, 18,
AMPLITUDE
SCALE LOG LIN
AMPTD UNITS, dBm
PEAK SEARCH
,
MKR FCTN MK TRACK ON OFF
, 50,
SPAN kHz
, 3,
BW kHz
VID BW AUTO MAN
75 Ω input:
AMPLITUDE
6. Press the following analyzer keys.
,
PEAK SEARCH
,
MKR FCTN MK TRACK ON OFF
7. The MKR ∆ amplitude reading should be 0.0 dB ±0.01 dB. If it is not,
repeat step 5.
Chapter 2a
Making Adjustments: If 3335A Source Not Available
Figure
Figure
(OFF)
MHz
−dBm
(LIN),
More 1 of 2
(ON)
, 300,
Hz
, ,
More 1 of 2
MARKER DELTA
(ON)
6a. Cal Attenuator Error
2a-1. The 75 Ω RF input
2a-1.
,
AMPTD UNITS dBm
181