42 Agilent 5517B/BL/C/D/DL/FL User’s Guide
5 Adjustments
Preheat setting
All test point and jumper references are on the A3 Controller/Reference
Board. See Figure 13 on page 47 for the location of jumpers, switches and
test points.
1 Ensure that the laser head cable is disconnected from the laser head.
2 Remove the cover.
See “To remove the Front Panel and the Cover" on page 69.
3 Identify which board is used in the laser head by reading the board
part number on the board (see figures 13 or 14).
If the laser head contains the 05517- 60031 A3 Board, see Figure 13 on
page 47 for jumper and testpoint locations. (Note: the p/n 05517- 68031
is actually shown on the sticker.)
If the laser head contains the 05517- 60032 A3 Board, see Figure 13 on
page 47 for jumper and testpoint locations. (Note: the p/n 05517- 68032
is actually shown on the sticker.)
If the laser head contains the 05517- 60003 A3 Board see Figure 14 on
page 47 for jumper and testpoint locations.
4 Move the Heater Jumper A3JMP7 to its OFF position.
5 Remove the HVPS connector (3-pin with red/black wires) from the A1
Connector board (See Figure 15 on page 48).
6 Now, reconnect the laser head cable to the laser head to power it on.
7 Connect the DMM negative (–) lead to ACOM or , signal ground.
8 Connect the DMM positive (+) lead to A3TP11.
Because the heater wire resistance varies from tube to tube, the heater
voltage must be adjusted for each new tube assembly. A simple lookup
table is used to determine the proper set voltage. Depending on the type
of tube in yo ur laser hea d , see tab l e 10, or 11, or 12.
The preheat setting procedure must be performed when the laser
tube is at room temperature. If the laser high voltage power supply
or heater have been on, allow at least two hours to cool before
performing this procedure.
Be sure all power sources are disconnected before handling th e HV
leads as described below .
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