1. MPPC mass check with relays 21/11/2006 Hidetoshi Otono(ICEPP,Tokyo)

2. RelayElement This is a relay element.

3. Relay element Internal connection inputoutput A relay element is controlled by internal LED. An input signal is passed when internal LED turns on. LED

4. Setup ＬＥＤＭＰＰＣ relayOFF ＬＥＤＭＰＰＣ relayOn ＬＥＤＭＰＰＣ relayOFF ＬＥＤＭＰＰＣ relayOFF DC board ＬＥＤ driver AMPADC

5. Advantage of using relays We need only a couple of AMPs (because recommended AMP is still expensive) We need only a couple of ADCchannel (ADCmodule is expensive) It is easy to increase the number of MPPC

6. Test @ICEPP MPPC #18 signal MPPC #19 signal MPPC signal selected by relay

7. Pedestal data of MPPC#18 mean sigma Setup1 49.18 4.69 Setup2 47.28 5.31 Setup3 50.34 5.72 Setup4 41.14 7.60

8. Test@Tsukuba-u 5Ωrelay 1Ωrelay

9. Mean of the pedestal @ Tsukuba-u mean sigma Setup1 101.1 1.90 Setup2 101.7 2.05 Setup3 100.9 1.93 Setup4 101.1 1.84