Hameg HM8001-2, User Manual

17

Subject to change without notice

          O p e r a t i n g  t h e  H M 8 0 0 1 - 2

Mains/Line Voltage Change

On delivery, the instrument is set to AC 230 V mains/

line voltage. The instrument has an appliance inlet 

at the rear. This device contains the power fuse, 

which is interchangeable for the different mains/

line voltages. The fuse holder can be pulled out by 

means of a small screwdriver (after disconnection of 

the power cord from the appliance inlet). Change the 

power voltage by switching over the voltage selector 

switch. The fuse holder should then be plugged in 

again in the desired position.

The power fuse has to match to the set of the mains/

line voltage and must be changed if necessary. Make 

sure that only fuses with the required rated current 

and­of­the­specified­type­are­used­for­replacement.­

It is forbidden to repair defective fuses 

or to bridge them by no means. Any 

damage caused this way will void the 

warranty.

Required power fuse-link:

5x20mm, slow-blow, 250V~, C, to IEC 127/III;

DIN 41662.

Mains/line voltage   

Rated current

115 V~ ±10%: 

T 2 A

230 V~ ±10%: 

T 1 A

Calibration and Test Instructions

Remove case to calibrate and test the instrument. 

All voltages for operating the modules are sup-

plied from the multipoint connector contacts in 

the individual module compart ments. The easiest 

way of testing is by measuring them on inserted 

high power consumption modules (e.g. HM8030 

or HM8035). However, high power consump tion 

can also be simulated using resistors with the 

following values:

for 2 x   5 V

DC

­=­2­x­­ 5­Ω,­­ 5­Watts

for 4 x 20 V

DC

­=­4­x­40­Ω,­10­Watts

To avoid damaging of the multipoint connector 

contacts, the resistors should be linked to a 

corresponding 22 pole connector, onto which the 

required­1.3­kΩ­resistors­and­the­four­appropriate­

wire connectors can be soldered for programming 

the 4 x 20 V potential. The diagram (page 18) shows 

the values assigned to the multipoint connector 

contacts.

The accuracy of the DC voltages is partly depen-

dent on the reference voltage setting and the 

tolerance of the resistors used for programming. 

With the 1% accuracy set during manufacture and 

when using 1% resistors, the max. error is not 

more than 2%. Variations of the mains/line voltage 

of ±10% should not affect the supply voltages by 

more than 0.5%. The highest tolerable hum and 

noise level is max. 3 mV

pp

. Only voltmeters with at 

least 0.1% accuracy should be used for all measu-

rements. These should be connected directly to 

the multipoint connector contacts, as otherwise 

voltage­drops­could­influence­the­test­results.

If­the­specified­tolerances­are­not­met,­the­cause­

must be located and recalibration of the reference 

voltages may possibly be necessary.

Rear panel

1

Signal In-/Outputs  

for the right module 

compartment

(Option HO801)

Signal In-/Outputs  

for the left module com-

partment

(Option HO801)

Mains/Line 

Voltage Input 

and fuse

Mains/Line

Voltage selector