26
L4411A Getting Started Guide
1
Preparation for Use
Input Terminal Protection Limits
The protection limits for the L4411A input terminals are shown below.
Figure 1-8. L4411A Input Terminal Protection Limits.
A
C
D
B
Terminals
Protection Limits
Input (HI and LO)
Terminals
HI to LO Protection Limit
LO to Ground Protection
Limit
.
Current Input Terminal
The HI and LO input terminals are used for voltage, resistance, capacitance, and diode
test measurements. Two Protection Limits are defined for these terminals:
The Protection Limit from HI to LO (‘A’) is 1000 VDC or 750 VAC, which is also
the maximum voltage measurement. This limit can also be expressed as 1000
Vpk maximum.
The LO input terminal can safely "float" a maximum of 500 Vpk relative to
ground. This is Protection Limit ‘B’ above.
As is implied by the above limits, the Protection Limit for the HI input terminal is a max-
imum of 1500 Vpk relative to ground.
The current input ("I") terminal has a Protection Limit of 3A (rms) maximum current
flowing from the LO input terminal. This is Protection Limit ‘C’ above. Note that the cur-
rent input terminal will be at approximately the same voltage as the LO terminal.
Sense (HI and LO)
Terminals
The HI and LO sense terminals are used only for four-wire resistance and temperature
measurements ("
Ω
4W"). The Protection Limit is 200 Vpk for all of the terminal pairings
(‘D’):
LO sense to LO input.
HI sense to LO input.
HI sense to LO sense.
The 200 Vpk limit on the sense terminals is the Protection Limit. Operational voltages
in resistance measurements are much lower — less than 10 V in normal operation.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
