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2. High-Voltage Adjustment (SN 3004A and Above)
Equipment
High-Voltage
Adjustment Procedure
Warning
Warning
Digital Voltmeter (DVM)
...................................
.HP
3456A
DC High-Voltage Probe (1000: 1 divider)
.................. HP
34lllA
In the following procedure, it is necessary to probe voltages
which, if contacted, could cause serious personal injury. Use
a nonmetallic alignment tool when making adjustments. Be
extremely careful.
Do not attempt to measure the CRT filament voltage directly. The
filament voltage is referenced to the high-voltage cathode and
can only be measured safely with a special high-voltage true-rms
voltmeter and probe.
1. Set the spectrum analyzer’s LINE switch to STANDBY.
2. Remove the top cover from the IF-Display Section and connect
the equipment as shown in Figure
3-
12.
SPECTRUM ANALYZER
Figure 3-12. High Voltage Adjustment Setup
3. Set the DVM to the
1OOV
range, and connect the DVM to
AlA7TP3
(+
120V)
without the high-voltage probe. See
Figure 3-13.
Note
The accuracy of the high-voltage probe is specified for a probe
connected to a
de
voltmeter with 10 MO input resistance. HP
3456A
and HP
3455A
digital voltmeters have a 10
MQ
input resistance on the
100 V and 1000 V ranges. All measurements in this procedure should
be performed with the DVM manually set to the 100 V range
(&OO.OOO
on the HP
3456A
display).
3-40
Adjustments