see below. Press the PLOT key to send the file to the selected output. The .bmp extension
is added to the floppy disk file directory to allow viewing the filenames saved on disk.
The GPIB commands for controller directed return of the .bmp file contents are:
Send the sequence PLOTTER PLOT.BMP to select the bit-map mode.
Send TKPLOT to set the talk mode that returns the file when addressed to talk.
The GPIB commands to send the plot file contents to an output other than the GPIB are:
Send the sequence PLOTTER PLOT.BMP to select the bit-map mode.
Send PLOTSER1, PLOTCOM1, PLOTLPT1 or PLOTDISK to select the output.
{Use PLOT488 only with the front panel PLOT key manually to send in the talk
only (ton) mode to a listen only (lon) device}.
For PLOTDISK send FILENO ## to select a filename.
Send PLOT to simulate pressing the PLOT key to send the file to the selected
output.
1.4 External Trigger Input Calibration
A provision to zero and calibrate the external trigger inputs has been added to provide
better accuracy for voltage measurements made with the trigger inputs. The following
procedure is used to calibrate each external trigger input:
Set
Time>Timebase
to “5 ms/Div”
Set
Trig>Trig Mode
to “Auto”
Select the external trigger input in the
Trig>Trig Source
menu corresponding to
the selected measurement channel (CH1 to 1EXT or CH2 to 2EXT).
Set the
Chan#>Extensions>Display
to “Trig” (Trigger View Mode)
Set the
Chan#>Vert Scale
to 1.00 V/Div
Set
the
Spcl>Servicing>Cal Mode
“On”
With
Cal Mode
“On” two boxes labeled
Ext Trig Zero
and
Ext Trig Cal
will appear in the
Chan#>Extensions
menu.
Ext Trig Zero
will have a bright “Start” label.
With no input to the selected external trigger input, press the menu button for
Ext Trig
Zero
“Start”. The input will be zeroed and the
Ext Trig Cal
“Start” label will be bright.
With +3.00 volts applied to the selected external trigger input, press the menu button for
Ext Trig Cal
“Start”. The input will be calibrated for 3 divisions of deflection at 1 V/Div.
Set the
Spcl>Servicing>Cal Mode
“Off”
The results of the calibration are stored in non-volatile memory with file extension .TRV.
Absent a file, default data is supplied automatically and simulates the existing software.
External trigger level calibration is not available on the GPIB.
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