HP 8560E Service Manual

82 Chapter2
Adjustment Procedures
5. DC Log Amplifier Adjustments
5. Set up an HP 3335A as follows:
Frequency ........................................................................15MHz
Amplitude ........................ ..............................................−18dBm
6. Press
PEAK SEARCH and MARKER DELTA.
7. Reduce the input power by 40 dB, to −58 dBm (use an attenuator or
a source with a good relative amplitude accuracy).
8. If the signal is lower on the screen than expected (delta marker
reads a change of greater than 40 dB, such as −41dB), then adjust
A4R544 (see <Undefined Cross-Reference>) for an even lower level
and press
CAL and ADJ CURR IF STATE. Allow sufficient time for the
spectrum analyzer to complete the adjustment.
9. If the signal is higher on the screen than expected (delta marker
reads a change of less than 40 dB, such as reads −39 dB), then adjust
A4R544 for an even higher level signal and press
CAL and ADJ CURR
IF STATE. Allow sufficient time for the spectrum analyzer to complete
the adjustment.
10.Repeat the adjustment and adjust current state until the delta
marker reads −40 dB ±2 dB.
A4 Log Fidelity Adjustment
This adjustment consists of adjusting A4R531 until the error is
adjusted to zero.
Procedure
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and place the spectrum analyzer in the service
position as illustrated in Figure 2-6 on page 75. See Figure 2-7 on
page 76 for adjustment location.
2. Connect the HP 3335A 50 Ω output to the HP 8560E/EC 50 Ω input.
Press
LINE to turn the spectrum analyzer on.
3. Press
PRESET, CAL, IF ADJ OFF and ADJ CURR IF
STATE.
4. Set the HP 8560E/EC controls as follows:
Center frequency .............................................................15MHz
Span.................................... ........................................................0
Resolution BW ........................... .....................................300kHz
Reference level ........................... ....................................−10dBm
5. Set up an HP 3335A as follows:
Frequency ........................................................................15MHz
Amplitude ........................ ..............................................−10dBm

HP 8560E Specifications

General

Brand	HP
Model	8560E
Category	Measuring Instruments
Language	English