AMETEK Programmable Power XPF Serie Manuel D'instructions page 33

Step Settings
1. O/P off
2. 0V
3. Max V, 1A
4. Max V, 1A
5. Max V, 1A
6.
I
pot at 0
7. 4V, 0A
8. 4V, 0A
9. 4V, 10A
10. 4V, 10A
11. O/P off
Powerflex Adjustment
This is factory set and would not normally need to be readjusted during routine calibration.
However, if a component in that part of the circuit has been changed, proceed as follows. These
adjustments are on the Control PCB mounted behind the front panel, accessed by removing the
top cover which is secured by 6 screws.
When the instrument is connected to its supply the removal of covers is likely to expose live parts.
Any adjustment of the opened instrument under voltage shall be avoided as far as possible and, if
inevitable, shall be carried out only by a skilled person who is aware of the hazard involved.
VR213/VR215 are the adjustments for OUTPUT 1 and VR13/VR15 are for OUTPUT 2; in both
cases these potentiometers can be found close to the current shunt heatsink.
Set the PSU to maximum volts and current.
Set the load to 3.2A and switch on.
Adjust VR13/213 so that the UNREG led just comes on.
Set psu voltage to 20V.
Set the load to 20.00A.
Adjust VR15/215 for 19.1X volts (UNREG led should be on).
These adjustments are most easily performed using an electronic load.
32
Display Adjust for
−5mV ± 2mV
Cal count
Cal count 0V ± 2mV
Cal count 60V ±2mV
O/P volts Display = DVM
OVP setting Display = DVM
Display = 0
I
pot
Cal count 0mA ± 2mA
O/P amps Display = milli-ammeter ±2mA
Change load
Cal count 10A ±10mA
O/P amps Display = ammeter
End -
WARNING!
Load Detail
DVM O/P off volts
DVM
V
DAC zero
DVM
V
DAC scale
DVM
V
metering scale
DVM OVP
-
I
pot ADC zero
milli-ammeter
I
DAC zero
milli-ammeter
I
metering zero
Ammeter
I
DAC scale
Ammeter
I
metering scale
- Stores and exits