Service manual

8508A
Service Manual
1-8
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).
DC and AC Voltage
Maximum rms terminal voltages
Sense Hi
Hi 250 V
Sense Lo 1000 V 1000 V
Lo 250 V 1000 V 1000 V
A 1000 V 1000 V 1000 V 1000 V
Guard 1000 V 250 V 250 V 1000 V 1000 V
DigGnd 650 V 650 V 650 V 650 V 1000 V 1000 V
Ground 0 V 650 V 650 V 650 V 650 V 1000 V 1000 V
Notes
• The A terminal is open circuit in these functions.
• 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
Hi 250 V
Sense Lo 1000 V 1000 V
Lo 250 V 1000 V 1000 V
A 5 V 250 V 1000 V 1000 V
Guard 250 V 250 V 250 V 1000 V 1000 V
DigGnd 650 V 650 V 650 V 650 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 n.a 20 A 20 A n.a n.a n.a
Rear input 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
Sense Hi
Hi 250 V
Sense Lo 250 V 250 V
Lo 250 V 250 V 250 V
A 250 V 250 V 250 V 250 V
Guard 250 V 250 V 250 V 250 V 250 V
DigGnd 650 V 650 V 650 V 650 V 1000 V 1000 V
Ground 0 V 650 V 650 V 650 V 650 V 1000 V 1000 V
Note
• The A terminal is open circuit in these functions.
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