FAQ
***
o How to program the gate-delay generator (2323)
o How to check if MIPP DAQ is running
o How to check if Ckov crates are receiving an external trigger
o How to check if all DAQ modules are working
o How to read or change HV
o How to use LED pulser to get signals on ADCs
o How to look at analog signals.
o How to look at digital signals.
===============================================================================
beamppc: ~wright/test     # location of test scripts

e907hv:  ~wright/hvc      # Doug's unofficial HV control program
         ~daq/hv_control  # official HV control program

e907daq:  /ppcboot/common/usr/local/mipp/online/config/ckov_config.xml
          /ppcboot/daq_home/rcd.log         # MIPP DAQ log file
===============================================================================
Rack 4  Equinox black box 
        (connects HV crate to /dev/ttyQ01e6 on e907hv)
           reset and init button (hole requires paperclick)
        bottom of rack:
        LV power supply top of Ckov
        LV power supply bottom of Ckov

Rack 5  HV crate LeCroy 1440 (at bottom)
        Slots 1-6 for CKOV

Rack 6  Crate 2 (bottom of rack)
        VME crate with beamppc

Rack 3  Trigger rack
        Crate 1

Rack ?  Crate 4
        slot 21 Jorway 41
	     Bit 1 -- TPC 1 (dsp trig)
	     Bit 2 -- TPC 2 (gating grid)
	     Bit 3 -- General to Rack 5 aux
	     Bit 4 -- CKoV

Rack 12 Crate 5 CKOV1	type	module	slots
                     	gate	2323 	1,2
			ADC	4300	4,6,8	
			TDC	3377	12,16
			Scaler  4434    14,18
   	      crate crontroller	70AX    24&25  3245

Rack 13 Crate 6 CKOV2	type	module	slots
                     	gate	2323 	1,2
			ADC	4300	4,6,8	
			TDC	3377	12,16
			Scaler  4434    14,18	
			DAC	5408	20		
   	      crate crontroller	70A     24&25  033316
        LED magic fan-out box inside rack on floor         
         
         2323 wiring diagram
            Start A from LED pulser fanout
            50ohm term
            DLY -> Start Chan B -> Start Chan B crate 5
            Toggles Trigger - Chan A
            Trigger - Chan B
            Camac on

Rack 17 LED pulser at bottom
        NIM create with linear fanout for LED pulser
 
Patch panel by Rack 24 (downstream)
  31  CKOV_to_LED
  32  CKOV_from_LED

Counting House
Yellow rack by console, closest to middle door
  LED pulser at bottom of rack
  Patch panel at top of rack
     31 CKOV_to_LED (connected to pulser at bottom or fack)
     32 CKOV_from_LED

===============================================================================
Command to program the 2323A:     2323 1 crate slot chan delay gate 0 0 
Note that channel A (B) is chan=0 (1).

NIM output triggers at same time as START, has width equal to progammed delay.
DLY output is delayed by programmable amount with width 10, 30, 100, or 300ns.
ECL output is either NIM or DLY, depending on internal jumpers.
Our modules should be set to NIM (i.e., no delay).

According to David the minimum DLY is about 50ns and the experiment
trigger comes so late that we can't afford this much delay!

===============================================================================
camac ADC  HV
crate slot slot  PMT channel
5     4	   6	 1-16
      6	   5	 17-32
      8	   4	 22-48
6     4	   3	 49-64
      6	   2	 65-80
      8	   1	 81-96
===============================================================================

o How to check if MIPP DAQ is running
-------------------------------------
  Login to e907daq.
  ls -l /ppcboot/daq_home/rcd.log
  See if date stamp is recent. 
  When running DAQ writes to log file every 50 events.

o How to check if Ckov crates are receiving an external trigger
---------------------------------------------------------------
  Login to beamppc. Scripts are in ~wright/test.
  Execute 'test_adc'.
  Should not get triggers.
  If you do, then something is sending triggers to the 2323.

o How to check if all DAQ modules are working:
----------------------------------------------
  Login to beamppc. Scripts are in ~wright/test.
  Execute 'test_all'.
  Compare output to 'test_all.ref'. Note, no need for HV or LV.
  If the ADCs are hanging sometimes, check that the experiment
  trigger (conected to 2323 in crate 5, chan B) is not blasting us.

o How to read or change HV:
---------------------------
  Log onto e907hv: ssh e907hv
  cd ~daq/hv_control; hv_control  # Andrew's program
     -or-
  cd ~wright/hvc; hvc             # Doug's program


o How to use LED pulser to get signals on ADCs
----------------------------------------------
  Turn on LED pulser (either in worm or counting house, not both)
  Log onto beamppc, cd ~wright/test.
  Set HV to 1900V
  <ake sure LV is on (needed by pre-amp on base)
  Execute 'test_led'      # should see difference with HV on and off

  If you are driving only bottom, then get light with input voltage
  starting at -1.8V, the maximum output seems to be at -5V (remember
  fanout will limit the voltage).  If you are driving both top and
  bottom, no light output below -2.5V.

o How to look at analog signals:
--------------------------------
  Use digitial scope. Trigger on analog output (directly from base, i.e.,
  unplug from delay board).
  50 Ohm DC coupled, 10mV, 10nsec, -10 mV threshold.
  Try PMT cable 81 at 1800V.

Split analog signal from base, one half to 4416 discriminator, other
half to ADC.  See charge on ADC before and after delay boards from
South Carolina!

o How to look at digital signals:
---------------------------------
Both + - should have 56Ohm pulldown resistor to -2V (Note that True+
is white base output labelled -, True - is blue base output labelled
+) Make sure threshold is set to -1.8V and LV and HV are on.  To see
signal on scope, pull out + or - signal (with powered pulldowns) and
couple scope with AC 1Mohm. Will see 1.5V by 40 nsec wide pulse
(positive going for + and negavite going for -, note that there is a
DC offset that keeps the signals entirely negative)

Digitial output does not appear unless threshold set to -1.8.

Note that there is a smaller (~10 times smaller) signal that is
200nsec after the real signal. This is probably a reflection
somewhere along the cable. This is probably not due to the ribbon to
lemo conversion on the scope because if you put the ribbon directly
into the discriminator you can lower the threshold enough to trigger
on both the big and little signals.


Checked digital output on scope
Trigger on analog output (directly from base) 50 Ohm DC, 50mV, 10nsec, -15 mV threshold

Short (8foot) ribbon cable from spider box to ECL-NIM modules in NIM carte
Look at NIM output of ECL-NIM on digital scope

Channel 84  (bottom)
   MB3,
  Spider box 4, channel 12
  HV slot 1 channel 3 (counting from 0)

digital output has -300 mV DC offset (at 50Ohm) (NB through ECL-NIM module)
digital signal shoots back to zero volts and then down to -2V. 
jagged and triangular with a width of about 150 nsec

Digital signal after long ribbon cable (to rack 13) and then to
NIM-ECL -300mV offset, big positive pulse (-300 to 0 mv) width ~40
nsec followed by big negative pulse (-300 to -500 mV) width ~40 nsec,
but 150 nsec after first pulse Digital lines must be inverted!

Invert ribbon cable (now find Channel 84 on channel 6), DC offset is
gone, nice negative pulse -0.5 volts, primary width 50nsec, but
multiple trailing pulses of diminishing magnitude, typically see two
smaller pulses after main one.