LeCroy 6010

"Magic Controller"

External

LeCroy 2228A TDC

COM STOP COM START STOP 0 1 2 3 4 5 6 7 CLEAR 63348

FULL SCALE COUNT TEST POINT

PICOSEC./COUNT SELECT 250 100 50

LeCroy MODEL 2228A CURRENTS -6V 550 mA +6V 600 mA -24V 140 mA +24V 25 mA LeCroy RESEARCH SYSTEMS

LAM SELECT END OF CONVERSION (EOC) EOC AND ADDRESSED CHANNEL VALID OC AND ANY CHANNEL VALID OFF

Q SELECT EOC EOC AND ADDRESSED CHANNEL VALID EOC AND ANY CHANNEL VALID

CAUTION CRATE POWER SHOULD BE TURNED OFF DURING INSERTION AND REMOVAL OF UNIT TO AVOID POSSIBLE DAMAGE CAUSED BY MOMENTARY MISALIGNMENT OF CONTACTS

Internal

Key ICs:

• MOTOROLA MC10102P: input quad 2 input NOR gate

mixes test trigger?

• RCA CA3046: NPN transistor array
• NE NE521N: dual differential comparator / sense amp
• LeCroy SC100: ADC?

2015-06-04 repair

11 bit ADC (0x600 full range) but values were as follows for the two units I tested:

Slot 9 (broken knob) CH0: 0x000632 CH1: 0x000644 CH2: 0x000632 CH3: 0x000358 CH4: 0x000637 CH5: 0x000525 CH6: 0x00062A CH7: 0x00063A

Slot 11 (good knob) CH0: 0x000699 CH1: 0x000691 CH2: 0x00069D CH3: 0x000353 CH4: 0x000696 CH5: 0x00069F CH6: 0x00068C CH7: 0x000686

Both units seem to have constant offset errors, possibly the test pattern generator. Also, CH3 is flaky on both units...coincidence?

Ran a 14 hour burn in test in test mode (slot 11 / good knob):

You can see considerable drift on channel 3 (yellow), the channel with a bad reading. Other channels were pretty stable, within +/- 1 DN over the entire period. Swapped some ICs around and issue seems to have gone away.

More measurements after swapping:

Took about 1200 seconds (20 min) to settle.

Test code: https:github.com/JohnDMcMaster/uvscada/blob/master/lecroy_6010/2228a_cal.py