Calibration, Calibration 5.1 introduction, 2 calibration setup – American Magnetics 12100PS DC Power Supply (CE-Marked) User Manual
Page 49

OPERATING MANUAL
CALIBRATION
Release 2.0 (98/06)
5-1
5. CALIBRATION
5.1 Introduction
WARNING
Exercise caution when using and servicing power supplies. High energy
levels can be stored at the output voltage terminals on all power supplies in
normal operation. In addition, potentially lethal voltages exist in the primary
circuit of these power supplies and in the output connector of power
supplies which are rated at 40 volts and over. Filter capacitors store
potentially dangerous energy for some time after you remove power.
Adjustments to programming and readback accuracy for the power supply are made using cover-off procedures
which must be performed by a service technician.
5.2 Calibration
Setup
5.2.1
Service Environment and Precautions
N
Follow established antistatic procedures.
N
Work at a bench with adequate room and support for the unit under test and for all equipment required.
N
To reduce shock hazard, use only an insulated, straight blade screwdriver when calibrating trim
potentiometers.
N
NEVER calibrate these units alone. Ensure that someone is present who can help should an accident
occur.
5.2.2 Equipment
Required
You will need the following equipment when calibrating your power supply.
N
5 1/2 digit true RMS voltmeters (DVMs) (±0.05% accuracy) with test leads
N
Current shunt 1mV/AMP (±0.25%) and connecting wire. The recommended current ratings for the DC
shunt and connecting wire must be at least 10% greater than the power supply's output current rating.
See also Table 5.2-1.
N
Non-conducting, straight blade screwdriver
Table 5.2-1 Current Carrying Capacity for Wiring
Wire Size (AWG)
Maximum Current (A)
Wire Size (AWG)
Maximum Current (A)
20
2.5
6
61
18
4
4
97
16
6
2
155
14
10
1
192
12
16
1/0
247
10
21
2/0
303
8
36