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Local Operation 53
With local control in effect, you can select a channel and use the front panel display to view the input voltage/current values
and the computed power value as well as certain fault and status conditions that may be present. This is referred to as the
metering mode.
The display can also be used to view the programmed settings of the selected channel by pressing the applicable
FUNCTION keys. You can change these settings using the ENTRY keys. This is referred to as the programming mode.
You can return the display to the metering mode from the programming mode by pressing
. Continually pressing the
Meter key will cause the display to step through the following for the selected channel:
•
"INPUT OFF" (if active)
•
"SHORT ON" (if active)
•
Volts/Amps input metering, for example, "9.99 0.99"
•
Computed power value, for example "9.9 WATTS"
•
Protection Features (if any are active):
"VF"-voltage fault
"OV"-overvoltage
"RV"-reverse voltage
"PS"-protection shutdown
"OC"-overcurrent
"OP"-overpower
"OT"-overtemperature
If the display is metering the input voltage/current or the computed power, you can use the Input Entry keys to increase or
decrease the actual input. These keys simulate front panel control knobs. Pressing
will cause the main level
(current, resistance, or voltage) of the active mode to increase, while pressing
will cause the main level to
decrease . You can continually press an Input key to speed up the changes. In the CC and CR modes, the total amount of
change is determined by the selected range.
The protection features (OV, OC, OP, etc.) listed above are described briefly in Chapter 2 Operation Overview in this
guide. When programming the Multiple Electronic Load remotely, you can use the Multiple Electronic Load’s status
reporting capability to check the state of the protection features. Refer to Chapter 5 Status Reporting in the Agilent
Electronic Load Family Programming Reference Guide.
Note If the input voltage exceeds the maximum measurement capability of the selected module, the front panel
display will indicate an overload (OVLD) condition. For example. if the channel 2 module has a
measurement overload condition, the front panel display will change from indicating the measured
volts/amps values (or the computed power value) to indicating "2 OVLD".
Using The CHAN Keys
These keys are used to select one of the channels for local control and/or display and to identify which module is installed in
the selected channel number. See Channel Number in Chapter 3.
In local control, the FUNCTION keys will control the module whose channel number is selected (appears on the display).
When power is turned on, channel number 1 is automatically selected. If no modules are installed in the mainframe, the
display will indicate "l INPUT DWN". Also, at power on, the message "UNKNOWN" can appear on the display along
with the affected channel number if the firmware will not support the specified module, or if the specified module is
defective. If either of these messages appear, the Err annnuciator will also be on. Pressing the Error key (shifted Address
key) will produce "ERROR - 240" on the display which identifies a hardware error (see Table 4-2 in the Electronic Load
Family Programming Reference Manual). If module(s) are installed in the mainframe and the Err annunciator remains on
after power is applied, the Multiple Electronic Load has failed selftest (see Chapter 3 Turn-On/Selftest).