Chroma 62020H-150S Operating & Programming Manual page 126

Programmable DC Power Supply (with Solar Array Simulation) 62000H Series
Operating & Programming Manual
2.
3.3.7.7.3 Calibration Procedure
1. Go to the CALIBRATION page as shown in Figure 3-136.
2. In the CALIBRATION page, press "
CHOICE=2.
ENTER
3. Press " " to display the current calibration options as shown in Figure 3-142.
R E M O V E A L L
4. Verify all loads have been removed from the output terminal and press "
confirm.
ENTER
5. Press " " to do the first low current range point calibration. The system will output a
fixed voltage and then set the Electronic Load to draw 1.0A current. The cursor will stop
at position [1] as shown in Figure 3-143. Enter the current read by the ULTRASTAB
SATURN (DVM) to position [1] and press "
A P P L Y
S E T L O A D I N G
A C T U A L O U T P U T
6. Turn off the Electronic Load and reconnect the DC Power Supply to a current shunt
whose rating is closest to but still covers 20A. For the Prodigit 7550, use the 20A shunt
directly.
7. Press " " to perform the 6.7A calibration. The cursor will stop at position [2] as
shown in Figure 3-144. Set the Electronic Load to draw 6.700A current. Enter the current
read by the ULTRASTAB SATURN (DVM) and press "
calibration values obtained, the system will calculate the calibration factor for the low
current range.
3-78
digits will reset and show "Math" for the current calibration.
Key in at least 5 digits for each calibration point to ensure the Power
Supply accuracy after calibration.
[ C U R R E N T
L O A D I N G
P R E S S [ E N T E R ]
Figure 3-142
[C U R R E N T
L O A D I N G A N D P R E S S[ E N T E R ]
C U R R E N T
C U R R E N T= 0 . 0 0 0 0 _ A
Figure 3-143
2
" or turn the "Rotary" (
M E A S C A L I B R A T I O N ]
F R O M O U T P U T
W H E N R E A D Y
ENTER
" to confirm it.
M E A S C A L I B R A T I O N ]
= 1 . 0 0 0
ENTER
) knob to set
T E R M I N A L
ENTER
" to
A
[ 1 ]
" to confirm. Using the