Alignment Procedure For Hm5010/Hm 5011; A Control And Adjustment Of Supply Voltages - Hameg Instruments Hm5011 Serviceanleitung

Alignment Procedure for HM5010/HM 5011

Attention! The opening of covers or removal of parts is likely to expose live parts and accessible terminals
which can be dangerous to life. Maintenance, service and alignment should be carried out by qualified
personnel only, which is acquainted with the danger involved.
When aligning the HM5010/5011 it is assumed that all sub-assemblies of the instrument are completely pretested and
working correctly. The tuner, IF-unit, and tracking generator should be pre-aligned. When aligning a HM5010, a separate
tracking generator unit must be available and connected to the HM5010 for some specific adjustments.
Prior to the alignment procedure, the instrument must warm up for 60 minutes.
All adjustments are carried out by means of a plastic screw driver or a ceramic adjustment tool.
The alignment is divided into the following steps:
A Checking of supply voltages
B Alignment of the tuner
C Alignment of the IF-unit
The numbering system is related to the respective pictures. Screen shots are designated as PIC
1 HF-Synthesizer 100 kHz to 1000 MHz, i.e. HM 8133
2 BNC cable, BNC T-connector, 2 x 10dB attenuator 50 Ohm
1 Voltmeter i.e. HM 8011-3
A Control and Adjustment of Supply Voltages
adjust: 12V to an accuracy of ±0.1V
adjust: minimum brightness
adjust: maximum brightness
adjust:
astigmatism
check:
– 12V tolerance ± 0.2V
check: +12V tolerance ± 0.1V
check: +5V tolerance ± 0.2V
check: –5V tolerance ± 0.2V
check: +38V tolerance ± 1V
check: +138V tolerance ± 1V
The corresponding voltage test points to check direct voltage can
be measured at the measuring connector strip (see PIC 2).
Basic adjustment:
When Y-pos. knob is snapped in on front board, adjust beam
approx. 2 mm below bottom graticule line via R801.
PIC 1. PS-Board
18
D Linearity alignment
E Tracking generator alignment
F Check of overall adjustment
via Trimpot 4 PIC 1
via Trimpot 2 PIC 1
via Trimpot 3 PIC 1
via Trimpot 1 PIC 1
Instrument Rear Side
1
1 +138V
2 +38V
3 GND
4 +5V
5 +12V
6 -12V
4
3 2
CRT-Board
PIC 2. XYF-Board (partial)
1
Subject to change without notice