HP 8648 A/B/C/D - Changpuak.ch

AM Level: FE
HP 8648B/C/D Only (Not used for serial prefixes 2 3847A/3847U)
AM Level: FE
Description This adjustment performs the AM Level adjustment on the Frequency
Extension module by connecting the function generator and the DVM
to motherboard connector 53 1.
This adjustment performs the two adjustments to the output board
that require the use of the voltmeter. It sets up the multiplexer on the
output board to measure dc voltages while the potentiometers are
being adjusted.
Required Test Function Generator
Equipment DVM
531 Test Point Extender (refer to the “Test Point Extender” section
at the front of this chapter)
Procedure
FUNCTION
GENERATOR
FUNCTlON
GENERATOR
- output
BNC TEE
,J31-3 ()Chayis GND
I \
DIGITAL MULTIMETER
f-i
pg@g gegz&
HP 6648 UNDER TEST
Figure 7-14. AM Level: FE Test Setup 1
BNC TEE
HP 8648 UNDER TEST
Figure 7-15. AM Level: FE Test Setup 2
DIGITAL MULTIMETER
/ .
Adjustments 7-l 5
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