HP (Hewlett-Packard) HP 85660B ユーザーズマニュアル

 Trace A 

 

 displays negative peaks.

(SHIFT) Trace A 

 

 displays sampled data.

(

S

  

 

 

 

 

 

 

H

I

F

T

)

 

T

r

a

c

e

 

T

 

T r a c e   A ( k s a ) r e t u r n s   t o   t h e   n o r m a l   a u t o m a t i c   d e t e c t i o n   m o d e s   a n d

removes the CRT indication.

The internal Error Correction Routine available by pressing 

 

 

(KSW) is also useful as a diagnostic aid. If a malfunction causes the routine to stop, restart

it and note the control settings (RES BW, ATTEN,  REF LEVEL, LOG/LIN,  etc.) when

the failure occurred. If the routine runs, the correction factors can be displayed by pressing

 

 

 Figure 2 displays the data for a typical instrument. Table 2 gives the

parametric information, specifications and a place to start the troubleshooting procedure.

Caution must be exercised in interpreting the correction factor data. Wrong conclusions
can be reached by not understanding how the internal program runs. The program assumes

that the input signal level is -10.0 dBm. Any error in this level translates to the correction
factors; therefore, the Amplitude Accuracy test 

 8 should be performed first. The

internal program runs in the LIN mode while 

 8 is in 1 dB/LOG mode. Large offsets

in LOG/LIN offset (lines 1 and 14) will cause errors in the data.

Figure 2. Error Correction Routine Data

8 Overall Troubleshooting