HP 8568B manual Discharge Procedure for High Voltage, Be careful

Discharge Procedure for High Voltage and

CRT

Warning

2. High-Voltage Adjustment (SN 3001A and Below)

AlA4, and AlA assemblies function properly and do not require compensation, proceed directly to adjustment procedure 4, “Final Display Adjustments (SN 3001A and Below)“.

The adjustment procedures in this manual do not require the removal or discharge of the AlA High-Voltage Regulator or CRT assemblies. However, if for any reason the AlA High Voltage Regulator Assembly or the post-accelerator cable must be removed, the following procedure ensures the proper safety.

This procedure should be performed by qualified personnel only. Voltages are present which, if contacted, could cause serious personal injury. Approximately -4000 V dc is present on the AlA High-Voltage Regulator assembly even when the ac line cord is disconnected. The CRT can hold a + 18 kV dc charge for several days if the post-accelerator cable is improperly disconnected.

Warning Do not handle the AlA High-Voltage Regulator Assembly or AlAll High-Voltage Multiplier until the following high-voltage discharge procedure has been performed.

1.Set the spectrum analyzer’s LINE switch to STANDBY, remove the ac line cords, and remove the AlA High Voltage Regulator safety cover.

Warning With the ac power cord disconnected, voltages are still present which, if contacted, could cause serious personal injury.

Warning	In the following step, a large arc of high voltage should be drawn.
	Be careful.
	2. Locate the snap connector on the CRT post-accelerator cable.
	It is shown in Figure 3-11 as item 1. Using a long flat-bladed
	screwdriver with an insulated handle, carefully pry the connector
	loose but do not disconnect the cable.
	a. Using one hand, remove the end of the cable labeled item 2
	in Figure 3-l 1. As the end of the cable becomes free, touch
	the end of the cable to the CRT’s metal cover. A large arc of
	high voltage should ground to the CRT cover. The CRT is not
	discharged yet!
	b. Reconnect the CRT post-accelerator cable, and repeat the above
	step until high-voltage arcs no longer appear.
	3. Leave the CRT post-accelerator cable disconnected, and remove
	the cover on the AlA High Voltage Regulator.
	4. Connect a jumper wire (insulated wire and two alligator clips)
	between the shaft of a small screwdriver and the chassis ground
	lug on the inside of the high-voltage shield.

Adjustments 3 - 37