AMETEK DLM 600W Series - Manual (Page 52)

DLM 600W Series
M362161-01 K 3-6
8. Compare the DVM reading with the front panel display reading to verify accuracy
of the front panel display for CURRENT. The DVM reading must be converted to
current by multiplying the DVM reading by a conversion factor equal to the DC
current rating of the shunt divided by the burden voltage rating of the shunt.
9. Ensure that the control for CURRENT adjusts the output current across the full
rated current range. Also, the CURRENT indicator should be on and the
VOLTAGE indicator should be off.
3.4 Mode of Operation Setup
The power supply is capable of operating in constant–voltage or constant–current
mode. The mode of operation is dependent on the settings of the VOLTAGE and
CURRENT controls and resistance of the load. The power supply can automatically
crossover between the two modes of operation in response to load demands; refer to
Figure 3-2. The mode of operation is indicated with front panel LED's: VOLTAGE for
constant–voltage and CURRENT for constant–current.
Figure 3-2. CV and CC Modes of Operation
3.4.1 Constant–Voltage Mode of Operation
The power supply will operate in constant–voltage mode whenever the load current is
less than the current setting. In this mode, the power supply maintains the output
voltage precisely regulated to the voltage setting while the load current varies with the
load requirements. This condition is maintained as long as the load current is less than
the current setting. If the load resistance decreases to where the load current attempts
to exceed the current setting, the output current is then regulated at the set value and
the output voltage decreases. This is the automatic crossover to constant–current
mode of operation.