External Guard - Fluke 8588A Operator's Manual

8588A/8558A
Operators Manual
The Scan sequence of measurement in Tru Ohms Ratio is:
1. The Product waits with Forward current applied to the two resistors, with the
2. Upon receipt of a trigger, the Product executes any trigger delay.
3. After this delay, the Product changes to sense at the front terminals.
4. The Product executes the front delay, and then a measurement is made with
5. The Product switches to the Reverse current, executes the front delay, and
6. The Product sets the rear SENSE terminals.
7. The Product executes the rear delay, and takes a measurement with the
8. The Product switches to the forward current, executes the rear delay, and
9. The displayed result is the combination of the four measurements made.
10. The Product waits with forward current and rear SENSE terminals activated
Auto range is not available in this mode.
To prevent possible electrical shock, fire, or personal injury, do
not connect external capacitance >50 nF to the Product
terminals.
HIGH VOLTAGE. To avoid equipment damage when using the
HV function make sure that circuits or components connected
to the Product can withstand at least 240 V dc.

External Guard

 (Ext. Guard) is part of the Inputs menu. Push  (Ext. Guard) to turn
the Guard to ON and OFF.
 (Ext. Guard) has these choices:
•
•
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rear SENSE terminals active.
the Forward current.
then takes another measurement.
Reverse current.
then takes another measurement.
until the next trigger.
OFF (default): The GUARD terminals on the front and rear panels are
isolated from each other and from any internal connection. The internal guard
shields connect directly to the internal 0 V.
ON: The internal guard shields are disconnected from the internal 0 V, and
connected to the GUARD terminal of the selected front or rear input. See
Measure DC Volts.
XWWarning
WCaution