Hameg HM8001-2, User Manual

16

Subject to change without notice

Operating the HM8001-2     

Operating the HM8001-2

General  Information

Apart from the plug-in modules of the HM8000 

Modular System, self-designed modules can also 

be operated using the blank HM800. However, the 

maximum power and voltage levels must not be 

exceeded.

Attention!

When operating self-designed mo-

dules, the power consumption per 

module must not exceed 25 Watts.

Each module compartment of the mainframe 

HM8001-2 contains a 22 pole multipoint connector, 

by means of which the inserted module is connec-

ted to the corresponding operating voltages. Apart 

from­the­fixed­5­V

DC

 all other DC voltages can be 

programmed from the module using resistors and 

wire connectors.

The operating voltages of the modules are inde-

pendent from each other and adjacent modules 

do­not­influence­each­others­functions.­Therefore,­

no­modifications­are­necessary­to­the­mainframe­

for the supply voltage of each individual module. 

Refer to the programming instructions for further 

details.

Maximum Power supplied

The maximum total power output of each main-

frame is 36 Watts. Loads which draw excessive 

power will activate the transformer’s safety shut-

down protection until removed. The 8000 series 

modules use less than 11 Watts of power each 

under normal circumstances, with the exception 

of the Power Supply HM8040-3, which requires 

25 Watts and should not be used in conjunction 

with another HM8040-3 module under full load.

Programming

Except­for­the­fixed­+5­V,­all­other­regulated­DC­

voltages available in the mainframe HM8001-2 can 

be programmed on the modules PCB connector by 

means of a resistor and wire connector. These are 

already incorporated into all complete modules.

The reference voltages, precisely calibrated 

during manufacture, ensure a high recurrence 

accuracy of the output DC voltages if a low tole-

rance resistor is used for programming. Without 

the resistor each output (contacts 8 – 7 or 15 – 14) 

supplies  +5.2 V

DC

, provided that a wire connector 

has been mounted on the modules PCB connector 

(contacts 13  – 11 or 20 – 18).

Higher voltages can be programmed according to 

the following table:

The R

s

 resistor can be calculated using the fol-

lowing equation:

V

0

Wire 

Resistor R

s

across 8 + 7 

connector 

across 8 + 9

  (or 15 + 14) 

across 

(or 15 + 16)

5.2 V 

no resistor

10 V 

13 + 11 

3.92 kΩ

12 V 

20 + 18 

2.80 kΩ

15 V 

1.91 kΩ

18 V 

13 + 12 

1.5 kΩ

20 V 

20 + 19 

1.3 kΩ

18.8

R

s

 =  —————   (R

s

 in kΩ / V

0

 in V)

   V

0

 – 5.2