Grant Instruments QBH - Manual (Page 13)

QBD, QBA, QBH, 28089 Ver 12
Operating Manual Page 12
www.grantinstruments.com
EN
5.Maintenance
All products covered in this manual are designed to comply with IEC61010-1 and
can be flash tested. Some are fitted with radio frequency interference suppressers.
Therefore it is recommended that only a D.C. test be performed.
No other routine service is required.
Cleaning
The case can be cleaned with a damp cloth after disconnection. Do not use sol-
vents.
Before using any decontamination or cleaning method except that recommended,
check with our Service Department that the proposed method will not damage the
equipment.
Replacement of fuses
Disconnect from the power supply socket.
Remove the IEC power plug from the rear of the unit. Pull out the fuse drawer, re-
place the fuse with the correct type, and replace the fuse holder.
The fuses are ceramic quick acting, rated:
Model Fuse Rating (Amps) Model Fuse Rating (Amps)
230V QBA1 2 120V QBA1 2
QBA2 2 QBA2 3.15
QBD1 2 QBD1 2
QBD2 2 QBD2 3.15
QBD4 3.15 QBD4 5
QBH2 2 QBH2 3.15
Routine safety tests
If routine tests are to be made, we recommend a test of the integrity of the protec-
tive earth conductor and an insulation test at 500 V d.c. Routine flash tests are not
recommended for any electrical equipment, because repeated high voltage tests
degrade insulation materials.