APS 3A Series, Operation Manual

Page: 28 / 56

3A SERIES OPERATION MANUAL
Entire Contents Copyright

2014 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
3A SERIES AC & DC LOAD OPERATION MANUAL Page 28 of 56
Key # Description
11 LIMIT key and annunciator
Pressing the LIMIT key will place the load in the LIMIT ON state. This allows changes to be made to the
upper and lower measurement test limits for Go/NoGo operation. The display functions in LIMIT ON
Mode are selected in sequence by repeatedly pressing the LIMIT key as follows:
Voltage Limit:
Upper display shows upper voltage limit setting in Vrms, Lower display shows
lower voltage limit setting in Vrms.
Current Limit: Upper display shows upper current limit setting in Arms, Lower display shows
lower current limit setting in Arms.
Power Limit: Upper display shows upper true power limit setting in Watts, Lower display shows
lower true power limit setting in Watts.
VA Limit: Upper display shows upper apparent power limit setting in VA, Lower display
shows lower apparent power limit setting in VA.
Refer to section for key #13 below for adjusting upper and lower limit values.
After five presses of the LIMIT key, the LIMIT annunciator will turn off and the load returns to the LIMIT
OFF state.
12
SENSE key and annunciator
The voltmeter and internal trigger circuit of the 3A Series load can sense either at the load
terminals or at the EUT, if the external voltage sense cabling is connected to the point of load.
The SENSE key switches between INTERNAL (annunciator OFF) and EXTERNAL (annunciator ON)
voltage sense modes.
13
Coarse and Fine Tuning Up/Down Arrow keys
There are two sets of up/down arrow keys directly below the display area. The larger set of keys
allows coarse setting adjustments to be made. What parameter settings they adjust depends on
the selected mode as follows:
PRESET ON
 
Coarse increment or decrement of load setting
 
Fine increment or decrement of load setting
LIMIT ON
 
Increment or decrement UPPER limit settings
 
Increment or decrement LOWER limit settings
FREQ ON Depends on AC parameter selected
Frequency (FrEq)
 
Coarse increment or decrement of Frequency setting
 
Fine increment or decrement of Frequency setting
Bank (bAn)
 
Fine increment or decrement of bank selection (either set of keys)
 
Fine increment or decrement of bank selection (either set of keys)
Sync


External Sync ON


External Sync OFF
14
√2, 2.0, 2.5, 3.0, 3.5 Key and annunciators
These 5 keys only function while in CC mode of operation. All keys are disabled in either LIN or
CR modes. They are used to select from 5 different Crest Factor values for the AC load current
from the selected waveform Bank.
Note:
The CF value decals on these keys only reflect the actual CF value stored in bank zero (0).
For all other bank selections, the actual CF value may be different. Refer to Section 6.2.2,
“
Waveform and Crest Factor Bank Selection
” for details.