Fluke 5725A - Manual (Page 69)

Operating Notes
Conditions That Activate the 5725A
3
3-13
3-11. Current Operate
CURRENT
OUTPUT
HI
LO
VOLTAGE MODE
CURRENT MODE
5725A STANDBY
FAULT
OVERLOAD
CABLE OFF
11A
MAX
2OV
PK
MAX
CURRENT
OUTPUT
HERE
HI HI
LO LO
AUX
CURRENT
GUARD GROUND
WIDEBAND
SENSE
V A Ω
OUTPUT
V A Ω
µ
•
NO
OUTPUT
HI
BOOST
LIT
aq12i.eps
Figure 3-7. Current Operate Mode
Note
An overcompliance fault occurs if a low-resistance load is not connected to
the enabled 5725A binding posts when entering current operate mode.
Current operate mode is when only the CURRENT MODE indicator is lit. In current
operate mode, current output (either 5725A amplified current or redirected 5700A
current) is available at the 5725A binding posts. Current operate occurs under the
following conditions:
•
When, on the 5700A, the current output location is set to "5725A", and any ac or dc
current level is showing on the 5700A Output Display with the OPERATE
annunciator lit.
•
If "5725A" is selected in a 5700A setup menu as the current amplifier, and any of the
following conditions are true:
1. An ac or dc current 2.2A or above is showing on the 5700A Output Display with
the OPERATE annunciator lit.
2. Any level of dc current is showing on the 5700A Output Display with the
OPERATE annunciator lit, and the BOOST key on the 5700A is pressed so that
the BOOST indicator is lit.
3. An ac current 1A or above is showing on the 5700A Output Display with the
OPERATE annunciator lit, and the BOOST key on the 5700A is pressed so that
the BOOST indicator is lit.
4. The 5700A is ranged locked on the 11A range, and any dc current or an ac
current 1A or above is showing on the Output Display with the OPERATE
annunciator lit.
Note
Under certain settings of ac current, especially high current at frequencies
above 1 kHz, a whine from the 5725A is audible. This is caused by a piezo
effect in the current output transistors, and is normal.