`HELP Overview`

The Hewlett-Packard 54615B and 54616B are 2-channel digitizing oscilloscopes with a 500 MHz bandwidth.
They can analyze complex signals with great accuracy while preserving an analog-like highly interactive display with familiar controls. They feature an external trigger input, sweep speeds (Main and Delayed) of 5 s/div to 1 ns/div with .005 % accuracy, channel 1 and 2 sensitivity of 2 mV/div to 5 V/div with 2 % accuracy, automatic voltage, time and marker measurements, channel 1 and 2 math (+ and -), and an Autoscale function in addition to various other capabilities.

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`HELP Using the Panel`

The instrument functionality has been grouped into following panels.

Main Panel
Timebase Panel
Channel Panel
Trigger Panel
Measure Panel
Markers Panel
Waveform Panel
Display Panel
Status Panel

The 'Reset' button resets the instrument to default conditions by sending a "*RST" command and forces the value of waveform points in the instrument ('WAV Points' control in the Waveform panel) to 1000, and sets the display vectors off.

The left half panel displays the waveform data in addition to providing controls for 'Digitize','Autoscale','Run' and channel on/off switches.

A click on the XY display will acquire the waveform data (trace) (by sending a ":WAV:DATA?" command) for each active channel. It will not activate a fresh digitize operation. The 'Digitize' button, triggers a fresh digitization of the active channel(s), waits until the oscilloscope completes the sweep, and updates the waveform buffers. The Trigger panel too provides a control for digitizing. The 'Digitize (No wait)' button in the Trigger panel sends the "DIGITIZE" command for the active channel(s) but does not wait for the instrument to complete the sweep nor does it update the waveform buffers.

There is a switch (toggle) for each of the two channels which controls the status (Off/On) of the corresponding channel and the trace. When a channel is turned ON, the corresponding waveform data (trace) is acquired.

Refer to help on Waveform components for details on waveform data buffers and relatedcomponents.

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`HELP Waveform Components`

For Acquisition types 'Normal' and "Average', the waveform (trace) data for each channel is stored in the following components :
WF_CH1 RTRACE 5000 channel 1 data
WF_CH2 RTRACE 5000 channel 2 data

The component 'WF_SIZE' gives the actual number of points in the waveform i.e. size of each trace.

For Acquisition type 'Peak DET', the waveform data is stored as follows:

PEAK_CH1 RTRACE 2,1000 channel 1 peak data
PEAK_CH2 RTRACE 2,1000 channel 2 peak data

The component 'WF_SIZE' in this case, gives the trace size of each of the rows ( max values in first row and min values in second row).

And, following components in the driver are used to store the pixel memories :

DATA_PM1 IARRAY 8128 buffer for PMEM1
DATA_PM2 IARRAY 8128 buffer for PMEM2

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`HELP Main Panel`

This panel provides controls for Timebase(in s/div), the Trigger source, Trigger Mode, Trigger Level and Sensitivity(in V/div) and Probe Attenuation for each of the channels. These controls are also available in the respective (Timebase, Trigger and Channel) panels.

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`HELP Timebase Panel`

This panel has controls for the Timebase sensitivity(in s/div), Timebase Delay and Timebase Reference. The driver does not support 'Delayed' and 'XY' Horizontal Modes as no waveform or measure data is available under such conditions. Thus, the HORZ Mode control in this panel just displays 'Main' as the Timebase mode, but does not allow the user to set or get the Timebase mode.

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`HELP Channel Panel`

This panel allows the user to set up the channel (Y-axis) parameters, independently for each channel. The 'Math' control (which is available for channels 1 and 2) is common between channels 1 and 2.

Vertical sensitivity(SENS) for channels is set in V/div.

The controls for status of each channel (VIEW/BLANK) are provided in the left half panel.(the 'CH1','CH2' toggles).

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`HELP Trigger Panel`

This panel allows the user to set up the trigger conditions.The trigger controls have been grouped into two subpanels with the 'TRIG Mode' control being available in both the panels.

The TV Mode controls are available only when the TV 'TRIG Mode' is selected. Only channels 1 and 2 can be used as Trigger sources under TV Mode.

There is a 'Digitize (No wait)' button available in this panel. This button is different to the one available in the left half panel. In this case, after sending the 'DIGITIZE' command for the active channels, the driver does not wait for the instrument to complete the sweep nor does it update the channel buffers.

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`HELP Measure Panel`

This panel can be used to make Voltage and Time parametric measurements on the waveform data. There is a panel each for Voltage and Time measurements apart form the main measurement panel.

The 'MEAS Source' control in the main measurement panel selects the channel onwhich the measurements are made. This control is same as the 'Source' control in the Markers panel. The 'Measure ALL' button reads all the 14 Voltage and Time parameters. The 'Scratch' button scratches the measurement
data and invalidates the markers.

An additional 'Time MEAS' panel allows you to search the displayed signal (MEAS Source) for a defined Voltage level and edge. The corresponding Time Interval between the trigger event and this defined occurrence is returned, using the ":MEAS:TVOLT?" command.

It should be noted that none of the controls in this panel trigger a fresh digitize operation. The measurements are made on the available waveform data.

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`HELP Markers Panel`

This panel allows you to set up and read the V and t Markers. The 'Source' control selects the channel on which marker measurements are made and is same the 'MEAS Source' control in the Measure panel.

Each marker (V 1, V 2, t 1 and t 2) can be moved using the '<<' and '>>' buttons or set to a given value. The corresponding delta values V2-V1 and t2-t1 are displayed (or can be queried).

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`HELP Waveform Panel`

This panel(together with the Display panel) allows the user the set up the conditions for the Digitize operation (such as Waveform Type, Completion) and defines the number of Waveform points to be transferred. ('WAV Points').

The driver always transfers the waveform in 'WORD' format. The 'Waveform' control, which is same as the 'DISP Mode' control in the Display panel, selects the Acquisition type (Normal, Average or Peak DET). For 'Peak DET' Acquisition type, the only allowed value for 'WAV Points' is 1000.

Refer to help on Waveform components for details on waveform data buffers and related components.

The 'Completion' control defines the minimum completion criteria for an acquisition and the 'ACQ Points' (query only) returns the number of points that the hardware acquired from the input signal. The actual number of points transferred over the bus, is determined by the 'WAV Points' control.

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`HELP Display Panel`

This panel provides controls for setting up the display (similar to the Display menu on the instrument.) and for pixel memory operations.

The 'DISP Mode' control selects the Acquisition type and is same as the 'Waveform' control in the Waveform panel. The '# Average' defines the number of values to be averaged for each time bucket in the Average acquisition mode.

The 'Merge' buttons store the contents of the active display into the specified pixel memory in the instrument by sending the corresponding "MERGE" command. The 'Upload' buttons transfer the specified pixel memory data from the instrument to a corresponding buffer in the driver ('DATA_PM1' for PMEM1 and 'DATA_PM2' for PMEM2). The 'Download' buttons do the reverse i.e. transfer the specified pixel memory buffer from the driver to the corresponding pixel memory in the instrument. The 'Erase' buttons erase the specified pixel memory in the instrument by sending a "ERASE" command and invalidate the corresponding pixel buffer in the driver.

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`HELP Status Panel`

This panel provides controls for querying the Status Byte(*STB?), Error Number(:SYST:ERR?), Event Register(*ESR?) and Operation complete (*OPC?).

The 'Self Test' control sends a "*TST?" command , which initiates a self test of the instrument and displays a "PASS" if success(0) is returned or a "FAIL" if failure(1) is returned.

The 'OPC' and 'WAI' buttons send the "*OPC" and "*WAI" command respectively and the 'Event Enable' and 'SRQ Enable' controls allow the user to set and query the respective event registers. (*ESE and *SRE).

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`HELP Components`

The following table summarizes the component names and values for the HP 54615B instrument driver. For information about using this summary, see the chapter, "Fine-tuning Your Program," in the HP ITG "User's Handbook."

-------------------------------------------
Component       |   Values       | Initial |
                |                | Value   |
-------------------------------------------|
                |                |         |
ACQ_POINTS      | -32768 - 32767 |0,INVALID|
AUTOSCALE       |                |         |
BWLIMIT_CH1     | OFF,ON         | OFF    |
BWLIMIT_CH2     | OFF,ON         | OFF    |
COMPLETION      | 0 - 100        | 100    |
COUPLING_CH1    | DC,AC,GND      | DC     |
                | DCFIFTY        |         |
COUPLING_CH2    | DC,AC,GND      | DC     |
                | DCFIFTY        |         |
DATA_PM1        | IARRAY[8128]   | INVALID |
DATA_PM2        | IARRAY[8128]   | INVALID |
DIGITIZE        |                |         |
DIGITIZE_IMM    |                |         |
DISP_GRID       | OFF,ON         | ON     |
DOWNLOAD_PM1    |                |         |
DOWNLOAD_PM2    |                |         |
ERASE_PM1       |                |         |
ERASE_PM2       |                |         |
HIT_COUNT       | N8,N64,N256    | N8     |
INVERT_CH1      | OFF,ON         | OFF    |
INVERT_CH2      | OFF,ON         | OFF    |
LEARN_STRING    | IARRAY[65]     | INVALID|
MARKER_STATE    | OFF,ON         | OFF    |
MATH_CH         | OFF,PLUS,SUB   | OFF    |
MEAS_ALL        |                |         |
MEAS_SCRATCH    |                |         |
MEAS_SOURCE     | C1,C2          | C1     |
MEAS_T_DUTY     |                |0,INVALID|
MEAS_T_FREQ     |                |0,INVALID|
MEAS_T_FTIME    |                |0,INVALID|
MEAS_T_NWID     |                |0,INVALID|
MEAS_T_PERIOD   |                |0,INVALID|
MEAS_T_PWID     |                |0,INVALID|
MEAS_T_RTIME    |                |0,INVALID|
MEAS_T_TVOLT    | VMIN_MSMT -    | INVALID |
                |   VMAX_MSMT    |         |
MEAS_T_TVOLT    | -100,100       |0,INVALID|
       _EDGE    |                |         |
MEAS_T_TVOLT    |                |0,INVALID|
       _TIME    |                |         |
MEAS_V_AVRG     |                |0,INVALID|
MEAS_V_BASE     |                |0,INVALID|
MEAS_V_MAX      |                |0,INVALID|
MEAS_V_MIN      |                |0,INVALID|
MEAS_V_PP       |                |0,INVALID|
MEAS_V_RMS      |                |0,INVALID|
MEAS_V_TOP      |                |0,INVALID|
MERGE_PM1       |                |         |
MERGE_PM2       |                |         |
NUM_POINTS      | N100,N200,N250,| N5000   |
                | N400,N500,N800,|         |
                | N1000,N2000,   |         |
                | N4000,N5000    |         |
OFFSET_CH1      | -4000 - 4000   | 0      |
OFFSET_CH2      | -4000 - 4000   | 0      |
PEAK_CH1        | RTRACE 2,1000 | INVALID |
PEAK_CH2        | RTRACE 2,1000 | INVALID |
PROBE_CH1       | X1,X10,X100    | X1     |
PROBE_CH2       | X1,X10,X100    | X1     |
RESET           |                |         |
RUN             |                |         |
SENS_CH1        | MIN_SENS_CH1 - | 100E-3 |
                |   MAX_SENS_CH1 |         |
SENS_CH2        | MIN_SENS_CH2 - | 100E-3 |
                |   MAX_SENS_CH2 |         |
STAT_ERR        |                |0,INVALID|
STAT_EVNT_ENR   | 0 - 255        |0,INVALID|
STAT_EVNT_EVR   |                |0,INVALID|
STAT_OPC        |                |         |
STAT_OPCV       |                |0,INVALID|
STAT_SELF_TEST | STRING[4]      | INVALID|
STAT_SRE        | 0 - 255        |0,INVALID|
STAT_STB        |                |0,INVALID|
STAT_WAI        |                |         |
TIME_DELAY      | -25 - 125      | 0      |
TIME_REF        | LEFT,CENTER    | CENTER |
TIME_SENS       | 1E-9 - 5       | 100E-6 |
TMARKER1        |WF_TMIN- WF_TMAX| INVALID|
TMARKER2        |WF_TMIN- WF_TMAX| INVALID|
TMARKER_DELTA   |                |0,INVALID|
TRIG_COUPLING   | DC,AC          | DC     |
TRIG_HOLDOFF    | 200E-9 - 13.42 | 200E-9 |
TRIG_LEVEL      | -3000 - 3000   |   0     |
TRIG_MODE       | AUTO_LVL,AUTO, | AUTO_LVL|
                |NORMAL,SINGLE,TV|         |
TRIG_NOISE_REJ | OFF,ON         | OFF    |
TRIG_REJ        | OFF,LF,HF      | OFF    |
TRIG_SLOPE      | POS,NEG        | POS    |
TRIG_SOURCE     | C1,C2,EXT,LINE | C1     |
TRIG_TV_HFREJ   | OFF,ON         | OFF    |
TRIG_TV_MODE    |LINE,FIELD1,    | FIELD1 |
                | FIELD2        |         |
TRIG_TV_POL     | POS,NEG        | NEG    |
UPLOAD_PM1      |                |         |
UPLOAD_PM2      |                |         |
VIEW_CH1        | OFF,ON         | ON     |
VIEW_CH2        | OFF,ON         | OFF    |
VMARKER1        | VMIN_MSMT -    | INVALID |
                |   VMAX_MSMT    |         |
VMARKER2        | VMIN_MSMT -    | INVALID |
                |   VMAX_MSMT    |         |
VMARKER_DELTA   |                |0,INVALID|
WF_CH1          | RTRACE 5000    | INVALID |
WF_CH2          | RTRACE 5000    | INVALID |
WF_DATA         |                | DONTCARE|
WF_SIZE         | 1 - 5000       | 5000   |
WF_TYPE         | NORMAL,AVERAGE,| NORMAL |
                | PEAK          |         |
XY_GRATICUL     | -32768 - 32767 | 1      |
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