Calibration
7.3 Calibration Procedure
The power source can be calibrated from the front panel. There are no manual calibration
adjustment inside the unit so there is no need to remove the top cover.
The following items require routine calibration:
U Set&Meas, to calibrate output voltage setting and measurement.
I Set&Meas, to calibrate output current limit setting and measurement.
P Set&Meas, to calibrate output power limit setting and measurement.
R Set&Meas, to calibrate output programmable resistance setting and measurement.
Clear, to clear the improper calibration values if necessary.
The user can perform his own calibration if needed. For traceability, it is recommended a
calibration lab perform these calibrations.
7.3.1 Accessing Calibration Mode
The Calibration screens are located under the Menu submenu. Press the
Calibration
soft key
to display the calibration password screen.
Move the cursor to the “Enter Password” field and enter the number “9527” as the password.
Press the [Enter] key to confirm.
You will now be able to select the calibration item to continue.
Calibration
1
7
Calibration
All APM instruments are factory calibrated prior to shipment. The recommended calibration
interval for this series power supply is one year. Calibrate only as needed.
7.1 Calibration Equipment required
The following equipment is required to perform calibration on any of this series power supplies.
Item
1
2
3
Type
DMM
Current Shunt
Adjustable Resistive or Programmable Load
Range
Suitable for CV rating
Precision Shunt Resistor, 0.01ohm, 0.005% accuracy
Suitable for CC rating
7.2 Calibration Equipment Setup
The calibration equipment must be connected as shown in the diagram below.
Switch
Shunt
DC+
DC-
DMM
DC POWER SUPPLY
R LOAD or E-LOAD
Rear Inputs: I Meas
Front Inputs: V Meas
+
-
Vs+
Vs-
The DMM is used for both voltage and current measurements, requiring the operator
to switch between front and read inputs. Alternatively, a second DMM may be used for
current measurements instead if this is preferred.
63
PROFESSIONAL
INNOVATIVE BRANDING
SERVICE
62
PROFESSIONAL
INNOVATIVE BRANDING
SERVICE
Note
The switch shown is used to disconnect any load when performing voltage calibrations.
