HP 8642A Operation And Calibration Manual

Model 8642A/B
Adjustments
Identifying the Contents of the A3
The following is a procedure to display and identify the contents of the A3 Cal Data Memory.
1. Key in: ISHlFTllSPCLj ~ to enter service mode.
2. Key in: 8J ~ IHzl to display the Module 10 number of any Valid Cal Data in the A3 Board.
The A3 board EEPROM can be thought of as having 10 memory locations. The address of
each location, (numbered 0 through 9), is the Module lO Number. Each memory location will
either contain Valid Cal Data or it will be blank. The A3 addresses that cOlltain Valid Cal Data
will now be displayed. Some examples of the HP 8642 display are shown below. Refer to Table
5-4 to cross reference the A3 addresses (Module 10 Numbers) to the Memory Contents.
New AJ before down loading back-up data from A20: L...I V_A_L_ID_C_A_L_=_O. ______ oU_61_9--J1
Functional HP 8642A: I VALID CAL= 01234 6 89 .U619!
Functional HP 8642B: [VALID CAL= 0123456789 o.U@
3. Use the key sequence in Table 5-6 to display the cal. data stats for the module(s) you are interested
in. See Interpreting Cal Data Stats later in this section.
TaNe 5-6. A 3 Cal-Data Sials Display.
10 Number
HP 8642 Display
Service Special Function
Key Sequence for A3
0 Model # 40 Hz
0 Serial #
41 Hz
0
Options
42
Hz
1 A11 Stats 11 Hz
2
A12 Stats 12 Hz
3 A6 Stats 13 Hz
4 A13 Stats 14 Hz
5 A 19 Doubler Stats
15
Hz(1)
6
A16
or A19 Attenuator Stats
16
Hz
7
A19 Rev Pwr. Protect
Stats
17 Hz11)
8
A14 Stats
18 Hz
9 A2 Stats
19
Hz
r--'
11) If these special functions are lIsed on an HP 8642A "INVALID CHOICE
.U670"
will appear In the display
5-7

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English