HELP Overview
The HP8112A is  a 50MHz Programmbale Pulse
Generator capable  of generating pulses at
defined Periods, Widths, Delays  etc., and
under  different  modes  of  Triggering by
External  inputs. In this  model  of Pulse
generator  we can define the Pulse  shapes
and  Transition  times  (Both Leading  and 
Trailing edges). The  base parameters like
Period, Width, Delay and High level can be
controlled  by an external voltage applied
at the Control input.
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HELP Using the Panel
5Panels have been  defined  grouping   the 
parameters based on the functionality  and
usage. They are
MAIN Panel     Parameters related to Timings
               and Trigger modes
LEVELS Panel   Parameters related to Levels
               and Output controls
OTHER Panel    Pulse shape, Transition times
               and Slope related parameters.
STATUS Panel   Status and Error displays
ABOUT  Panel   About the Driver

Reset Button forces the  instrument  to  the 
Standard parameter set. 
Trigger Button simulates the function of MAN
key on the instrument.
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HELP Main Panel
Set Button on this panel  duplicates the Key 
operation of SET on instrument.
During the 'Control' selection of Perc, Delc
Widc,  Hilc  the   corresponding   Parameter
settings viz., Period, Delay, Width, Hilevel
are not effective on the instrument till the
Control mode is changed.
When one of  the  parameters  Width/Dcyc are
selected the other one is invalidated ( a '?'
mark is displayed)  indicating  the parameter
is not active in the output signal.
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HELP Levels Panel
Amplitude and Offset are only Display compo-
nents. They are computed based on Hi_level
and Lo_level.
Range of Hi_level and Lo_level are dynamic
and interrelated as shown below.
                      RANGE
           Limit On          Limit Off
       Min        Max      Min       Max
HIL (LOL + .1)    HIL   (LOL + .1)   7.9V
LOL    LOL     HIL - .1)  -8.0V  (HIL - .1)
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HELP Other Panel
Transition Parameters can be defined  only in
Linear and Gaussian Pulse  shapes. User  must
take care of the dependencies between Leading
and Trailing edges and their value couplings.
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HELP Status Panel
HP8112A provides a string  describing errors.
If an error occurs, status panel displays
the error string.
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HELP User Notes
1. Parameter dependencies are not taken care
in the driver. User must go through  the man.
before selecting the values  for  parameters.
 eg. LEE and TRE range couplings
  CTRL mode  selection  and  the  associated
	  parameter settings.
2. STO/RCL feature of  the  instrument is not
implemented on  the Panels. This feature  can
be obtained  using  HPITG  Store  and  Recall
modes.
3. 1 PULSE  key is not  also  implemented  as
it is not programmble.
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HELP Components
Component    |    Values        |  Initial 
                                   Value
_
Burst_count  | 1 - 1999         |  1         
Complement   | Off,On           |  Off       
Control      | Off,Perc,Delc,   |  Off       
             | Widc,Hilc        |
Delay        | 75E-9 - 950E-3   |  65E-9     
Double       | 20E-9 - 950E-3   |  200E-6    
Duty         | 1 - 99           |  50        
Error_string | STRING[40]       |            
Hi_level     | HIL_LO - HIL_HI  |  1.0       
Leading_edge | 5.5E-9 - 99.9E-3 |  10E-9     
Limit        | Off,On           |  Off       
Lo_level     | LOL_LO - LOL_HI  |  0.0       
Menu         | Main,Levels,Othe |  Main      
             | Status,About     |
Mode         | Norm,Trig,Gate,  |  Norm      
             | E_Width,E_Burst  |
Output_enabl | Off,On           |  Off       
Period       | 20.0E-9 - 950E-3 |  1.0E-3    
Temp_string  | STRING[10]       |            
Timing_check | Off,On           |  On        
Trailing_edg | 5.5E-9 - 99.9E-3 |  10E-9     
Trigger_mode | Off,Positive,    |  Positive  
             | Negative,Both    |
Waveform     | Fixed,Linear,Gaus|  Linear    
Width        | 10E-9 - 950E-3   |  100E-6    
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