Fluke Biomedical ESA180 - Manual (Page 34)

180
Users Guide
2-12
Lead-to-Lead (Auxiliary) Current
Lead-to-Lead [I
A
] (auxiliary) current flows from any patient lead to any other
patient lead and to all other leads connected together. The current can be dc or
ac or a combination of both. Measurements are made with a true-rms converter
to provide the common base necessary for accurate readout with a variety of
common wave forms.
Under normal conditions, the current is primarily input bias current,
measurement current, or lead off sensing current. The worst-case condition is
measured from the individual lead to all others connected together. This is the
measurement made by the Analyzer.
Use the following steps to measure lead-to-lead current:
1. Connect the patient leads to the snaps on top of the Analyzer.
2. Set the FUNCTION switch in the LEAD-LEAD position.
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
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3. Make readings for individual leads, selecting by the LEAD switch. The
single lead carrying the most current is the reference lead, R
L
, acting as
the return for the other leads.
LEAD LEAD
c
ra ll
rl rl
la la
all all
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