Specifications

More detailed specifications at www.agilent.com/find/N7900
74
APS Hardware Accessories
and Software
APS N7909A power dissipater unit
The optional N7909A power dis-
sipater unit adds current sinking
or two-quadrant operation to any
N6900 or N7900 power supply. Each
N7909A provides up to 1 kW of cur-
rent sinking capability to an APS
power supply, so you will need two
N7909As to achieve full two-quadrant
operation of a 2 kW APS supply.
You can use a single N7909A with a
2 kW APS power supply to achieve
50%
current sinking capability. The
N7909A
form factor is 1U and full
rack width. N7909A connects to an
APS power supply via a two-wire
power connection and a communica-
tion connection to provide continuous
two quadrant operation. The connec-
tions are located on the rear panel
of both the N7909A and the supply,
as shown in Figure 7. The N7909A
does not operate as a standalone
instrument. It only works with an
APS power supply. Additional
information on the APS’s 2-quadrant
operation:
• The APS provides programmable
+/- current waveform capability
to fully utilize the two-quadrant
operation
• The APS provides +/- current limit
settings to ensure your device is
operated in its allowable range
• Bydefault,theAPS’scurrentsink
capability will perform down
programming for pulling down
voltage levels when it is connected
to loads with stored energy, for
instance loads with a large amount
of parallel capacitance at their input.
• All these capabilities are also
available when you use a stand-
alone APS power supply’s 10%
rated output current sinking
capability without the N7909A
power dissipater unit.
Although the APS’s two-quadrant
operation gives it much of the same
functionality as a DC electronic load,
it cannot simulate current transients
as fast as an electronic load. For
instance, the APS can simulate full
range -/+ current transients at
~
5 ms, whereas a high performance
electronic load can achieve current
transients < 1 ms.
Single Output: 1 & 2 KW GPIB, LAN (LXI Core), USB
(Continued)
Specifications
(at 0° to 55°C unless
otherwise specified)
Advanced Power System DC power supplies overcome the toughest power test challenges
N7970A N7971A N7972A N7973A N7974A
Supplemental Characteristics (Non-warranted characteristics determined by design
that are useful in applying the product)
Voltage up-programming time
4
10% to 90% 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms
Settling time
6
1 ms 1 ms 1 ms 1 ms 1 ms
Voltage down-programming time
5
90% to 10% 0.35 ms 0.35 ms 0.35 ms 0.35 ms 0.35 ms
Settling time
6
0.8 ms 0.8 ms 0.8 ms 0.8 ms 0.8 ms
Current up-programming time
7
10% to 90% 2.5 ms 2.5 ms 2.5 ms 2.5 ms 2.5 ms
Output-on delay time
Voltage priority 12 ms 12 ms 12 ms 12 ms 12 ms
Voltage priority (with relay on) 38 ms 38 ms 38 ms 38 ms 38 ms
Current priority 14 ms 14 ms 14 ms 14 ms 14 ms
Current priority (with relay on) 46 ms 46 ms 46 ms 46 ms 46 ms
Line regulation
8
Voltage <10 µV <10 µV <10 µV <10 µV <10 µV
Current <10 µA <10 µA <10 µA <10 µA <10 µA
Small signal bandwidth
Voltage programming
9
DC to 1 kHz (-1dB); DC to 2 kHz (-3dB)
Current programming
10
DC to 70 Hz (-1dB); DC to 120 Hz (-3dB)
Voltage measurement DC to 14 kHz (-1dB); DC to 25 kHz (-3dB)
Current measurement DC to 14 kHz (-1dB); DC to 25 kHz (-3dB)
Notes:
4
With full resistive load and a voltage transition from 0.1% to 100% of rated output
5
With no load and a voltage transition from 100% to 0.1% of rated output
6
From start of voltage change to within 0.1% of final full scale value
7
With full resistive load and a current transition from 0.1% to 100% of rated output
8
Line regulation is guaranteed by design
9
With High Bandwidth setting, resistive load condition
10
With resistive load condition
Figure 7. N7909A power dissipater unit rear
connections to a 1 kW APS power supply
APS N7909A power dissipater unit