HP 85660B Error Correction Routine

@iZY) Trace A dIVIEW) (KSd) displays negative peaks.

(SHIFT) Trace A ‘[B) (KSe) displays sampled data.

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.

Error Correction Routine

The internal Error Correction Routine available by pressing @iFi) w[~~~~~~~~~ SPAN] (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 (SHIFT] “‘@ (KSw). 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 (RECALL] 8 should be performed first. The internal program runs in the LIN mode while [RECALL] 8 is in 1 dB/LOG mode. Large offsets in LOG/LIN offset (lines 1 and 14) will cause errors in the data.

h7 REF - 7 . 0 dBnl ATTEN 10 08

-0.17 ae

1 dB’ 0.30 dB

0 25 dB

0.20dB

0.21ClB

0 05 dB 155.000 unr

0.00 dB 75.000 unz

-0 10 dB 18.000 KHZ

-O.lB as 13.000 KHZ

L50 dB -11.000 ltHZ

8.20 dB -400 HZ

0.11 ClB 200 HZ

0.25 LiB -1Eio HZ

0 25 de -52 HZ

0 20 ClB -‘in HZ

0.05dB -41 HZ

-0.22 dB -36 HZ -0.17 dB

-0.03 dB -0.07 oe -0.03 .3B -0 15 dB

CORR’D	-0	08	OB
	-0.18		dB
	-D.IS		dB
	-0.02		dB
	-8.02		dB
	-0.02		dB
	-0	02	dB
	-0	02	as
	-0.02		dB
START	1Em 000		000	MHZ	STOP	ino	0
	RES	BW 30		HZ	“BW 188 HZ	SWP	i

Figure 2. Error Correction Routine Data

8 Overall Troubleshooting