Fluke 8921A, 8920A Service manual

Manual Supplement

Manual Title: 8920A/8921A Supplement Issue: 8
Part Number: 487157 Issue Date: 6/99
Print Date: October 1978 Page Count: 4
Revision/Date:

This supplement contains information necessary to ensure the accuracy of
the above manual. Enter the corrections in the manual if either one of the
following conditions exist:

1. The revision letter stamped on the indicated PCA is equal to or higher
than that given with each change.

2. No revision letter is indicated at the beginning of the change.

© 1999 Fluke Corporation. All rights reserved. Printed in the U.S.A. 

8920A/8921A Manual Supplement

Change #1

On page 1-4, replace everything on the page with the following:

AC + DC (add to AC specification. Assume 100 Hz if AC component is negligible.) :

Accuracy:

Above 2 mV +/-(10 digits or 0.5 dB)
Below 2 mV +/-(100 digits or 5 dB)

Temperature Coefficient (0 to 18 degree C/28 to 50 degree C):

Above 2 mV +/-(2 digits/degree C or 0.1 dB/degree C)
Below 2 mV +/-(20 digits/degree C or 1 dB/degree C)

Change #2

On page 4-20, replace Table 4-12 with the f ollowing:

Table 4-12. R19/R34, R66/R76 Resistive Values (mF, ±1%, 1/8W)

VALUE VALUE VALUE VALUE

499 K 34.8 K 68.1 K 24.3 K
332 K 32.4 K 57.6 K 22.6 K
169 K 30.1 K 48.7 K 21.5 K
115 K 28.0 K 43.2 K 20.5 K

86.6 K 26.1 K 38. K 19.1 K

Change #3

On page 4-2, add the following to the bott om of Table 4-1:

EQUIPMENT

NONMENCLATURE

Input Filter
Input Filter

500 Hz

100 W

REQUIREMENT RECOMMENDED

500 Hz
50 kHz

INPUT FILTERS

EQUIPMENT

Figure A.
Figure B.

50 Hz
100 W

.1 mf

8920_21_figa.eps

Figure A.

6/99 1

510 pf

8920_21_fig_b.eps

Figure B.