CHANGE 
8 
(Supersedes 
CHANGE 
4) 
This change introduces a new 
ALC 
board. The  RF  plug-in can now  be  power  meter leveled using the HP  436A  and HP  438A 
Power  Meters as well  as the HP 
432A. 
Page 1-4, Table 1-1, Note 5: 
Replace with the 
following: "Use the HP 432A/B/C, HP 436A, or HP 438A power meters. Both the HP 436A and 
438A must be used on the top three (least sensitive) ranges. However, the HP 438A may also 
be 
used on the 
fourth range by programming the response of the power meter's filter 
as 
follows: Set the HP 438A to range two, 
and press [MANFILTER] 
[I] 
[ENTER]. 
See 
the HP 438A Operating and Service Manual for further instructions. 
Sweep time 
r 
50 seconds." 
Page 1-8, Paragraph 1-42: 
Replace the first sentence 
with the following: "The RF output can be externally leveled using HP Model 432A/B/C, 
436A, or 438A power meters or negative polarity output crystal detectors." 
Delete the note below the paragraph. 
Page 1-10, Table 
1-4: 
In the first listing for "Power  Meter"  under Critical Specifications delete: "(No substitute when used for external 
power meter leveling)."  Change the Recommended Model to HP 
432A/B/C, 436A, 438A. 
In the listing for "Thermistor  Sensor," delete "(Used  with HP 432A)."  Under Recommended  Model,  delete HP 
8478B, and replace with "Unit  compatible with power meter being used." 
Delete the second listing for Power Meter. 
Delete the listing for Power Sensor. 
Page 3-3, Paragraph 3-23: 
Add the following: "For power meter leveling (ALC 
MODE 
[MTR]), the power meter is used in conjunction with the 
internal leveling loop. Low frequency variations are handled by the power meter, and high frequency variations 
are 
handled by the internal leveling loop." 
Page 3-5, Figure 3-3, Number 8: 
Delete: "(HP 432 only)." 
Pages 3-10 to 3-11,  Figure 3-7: 
Under EQUIPMENT change the Power Meter listing to: "HP 
432A/B/C, 436A, 438A."  Change the Thermistor 
Mount listing to: 
"Any  sensor compatible with the power meter being used." 
Under the NOTE,  delete: 
"The HP 435 and 436 power meters will not power meter level this plug-in. Only an HP 
432 may be used."  Add: "When using an HP 436A power meter, enable [RANGE HOLD] to lock the power 
meter in one range." 
Under PROCEDURE, step 5, delete 
"432A." 
Page 5-2, Table 5-1: 
Add 
A4C23 (SYM 1). Under Description, add "Minimizes square wave overshoot." 
Change 
A4R2 to A4R7. 
Change A4R4 to A4R14. 
Change A4R6 to A4R13. 
Change A4R7 to A4R9. 
Delete the line beginning with A4R9. 
Change A4Rll to A4R15. 
Change A4R47 to A4R81. Under Description, change U7-Q6 to U17-Q9. 
Change 
A4R56 to A4R82. Under Description, change U5 to U18. 
Change A4R59 to A4R78. Under Description, change US-Ql to U16-Q6. 
Delete the line beginning with 
A4R67. 
Add A4R99 (SYM 2). Under Description, add "Minimizes square wave overshoot." 
Page 5-7, Table 5-5: 
Delete "5-23. 
Power Meter Leveling Calibration." 
CHANGE 8