Fluke 8508A - Maximum Voltage and Current Inputs; DC and AC Voltage; DC and AC Current; Resistance and Temperature

8508A
Users Manual
Maximum Voltage and Current Inputs
Notes to maximum voltage and current input specifications
• Maximum DC input equal to maximum rms input. Maximum peak input is rms x 1.414
• Specifications apply equally to front and rear input terminals except where noted below.
• Front to rear isolation allows opposing polarity of maximum terminal voltage on each input.
• Digital I/O Ground (DigGnd) is internally connected to Safety Ground (Ground).
• Maximum Common Mode voltage with respect to Safety Ground is 1.7 x 10
5
VHz.
DC and AC Voltage
Maximum rms terminal voltages
Lo
A 1000 V
Guard 1000 V 250 V
DigGnd 650 V 650 V 650 V
Ground 0 V 650 V 650 V 650 V
Notes
• The A terminal is open circuit in these functions.
Sense Hi
Hi 250 V
Sense Lo 1000 V 1000 V
250 V 1000 V 1000 V
1000 V 1000 V 1000 V
250 V 1000 V 1000 V
650 V 1000 V 1000 V
650 V 1000 V 1000 V
• In 4wV mode Sense Hi is internally connected to Hi and Sense Lo is internally connected to Lo.
DC and AC Current
Maximum rms terminal voltages
Sense Hi
Sense Lo
Hi
1000 V
250 V
1000 V
A
Lo
5 V
250 V
250 V
1000 V
1000 V
1000 V
1000 V
DigGnd
Guard
650 V
250 V
650 V
250 V
650 V
250 V
650 V
1000 V
1000 V
1000 V
1000 V
Ground 0 V 650 V 650 V 650 V 650 V 1000 V 1000 V
Maximum rms terminal currents
Guard A Lo Sense Lo Hi Sense Hi
Front Input
Rear input
n.a 20 A 20 A n.a n.a n.a
n.a 2 A 2 A n.a n.a n.a
Notes
• The Sense Lo, Sense Hi, and Hi Terminals are open circuit in these functions.
• The front input A terminal protection is automatic and self-resetting, and does not interrupt current flow. Damage is likely to
occur if more than 20 A is applied.
• The rear input A terminal is protected by a fuse mounted on the rear panel.
Resistance and Temperature
Maximum rms terminal voltages
A
Guard 250 V
DigGnd 650 V 650 V
Ground 0 V 650 V 650 V
Note
• The A terminal is open circuit in these functions.
Lo
250 V
250 V
650 V
650 V
Sense Hi
Hi 250 V
Sense Lo 250 V 250 V
250 V 250 V 250 V
250 V 250 V 250 V
250 V 250 V 250 V
650 V 1000 V 1000 V
650 V 1000 V 1000 V
5-4