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Reprogramming delay will delay the onset of certain fault conditions and prevent the power supply from registering a fault
when these conditions are true. When the delay is in effect, the CV, + CC, - CC and UNR bits of the status register are
masked and cannot communicate with the mask and fault registers and the OCP function. This will prevent the supply from
registering a fault should any of these bits become set during the delay period. Reprogramming delay is initiated when any
of the following functions are executed:
VSET, ISET, RCL, OVRST, OCRST, OUT on/off
At power-on reprogramming delay is set to 20 mS. You can specify new values between 0 and 32 S in steps of 4 mS. If you
specify a value which is not a multiple of 4 mS, the supply will round off the set value to the nearest 4 mS multiple.
To program a new value of 80 mS in output 2 for example, send the following:
DLY 2,.08
If you send a value outside the 0 to 32 S range you will get a programming error. You may use the programming response
times in the specifications table to give you an idea of a typical delay setting. However, the appropriate delay setting will
also depend on load capacitance, load resistance, and current limit setting. See page 53 for output capacitor considerations.
To query the reprogramming delay setting of a particular output channel, send the following query:
DLY? 2 (using output 2 as an example)
and address the supply to talk. The response will be a numeric value between 0 and 32.
Display On/Off
When the display is on, the commands sent across the GP-IB may experience a slower processing time because the
processor must also spend time to monitor the outputs and update the display. You can shorten your command processing
time by turning off the display. To turn off the display, send the command:
DSP 0
To re-enable the display send the command:
DSP 1
You can also find out the status of the display by sending the following query and addressing the supply to talk:
DSP?
The response will be either a "1’’ or a "0’’.
Message Display Capability. The display command can also be used to display messages on the front panel. Messages
may consist of a maximum of twelve alphanumeric characters. Only upper case alpha characters, numbers, and spaces will
be displayed.
For example, to display the message "OUTPUT 2 OK", send the following command:
DSP "OUTPUT 2 OK’’
Note The BASIC programming statement for a series 200/300 computer would be as follows:
OUTPUT 705; "DSP""OUTPUT 2 OK"""