Fluke Biomedical ESA180 - Manual (Page 28)

180
Users Guide
2-6
device being tested. Depending on the device's operating current and the
electrical supply wiring, the voltage differential may be significant.
3. Check the value under load against the device's ratings to ensure that the
actual value remains within prescribed limits. An excessive drop also
suggests that a dedicated line of increased capacity should be run to the
instrument.
Measuring Device Current
Device, or Instrument, Current [I
L
] is the current used by the DUT. When
turned on, the device should be operated in its various modes to determine the
worst condition to track. Verify that the current of the DUT is within the
current rating of the Analyzer being used.
Measurement is made in the HOT wire via transformer coupling to ensure that
the total current is measured, as it is possible that the NEUTRAL and
GROUND wire could share the return path.
Use the following steps to measure device current:
1. Switch the FUNCTION switch to A - CURRENT . The meter displays the
device's current to 19.99 A.
V V
A
A
µA µA
L
E
A
K
A
G
E
- CURRENT - CURRENT
- RESISTANCE - RESISTANCE
- GROUND - GROUND
- CHASSIS - CHASSIS
- LEAD -GND - LEAD -GND
- LEAD -LEAD - LEAD -LEAD
- LEAD ISO - LEAD ISO
- DUAL - DUAL
- LINE VOLTS - LINE VOLTS
- CURRENT - CURRENT
- RESISTANCE - RESISTANCE
- GROUND - GROUND
- CHASSIS - CHASSIS
- LEAD -GND - LEAD -GND
- LEAD -LEAD - LEAD -LEAD
- LEAD ISO - LEAD ISO
- DUAL
- DUAL
fat04.eps
2. Place the OUTLET switch in the NORMAL position; the NEUTRAL
switch remains in the CLOSED position.
3. Turn on the device and place it in its maximum load condition to obtain
the proper reading.
4. Log this data to note changes in values that indicate early problems.