{"id":1394,"date":"2020-12-31T22:24:57","date_gmt":"2021-01-01T03:24:57","guid":{"rendered":"https:\/\/paulcarbone.com\/blog\/?p=1394"},"modified":"2023-06-04T10:17:07","modified_gmt":"2023-06-04T15:17:07","slug":"tektronix-564-revisited","status":"publish","type":"post","link":"https:\/\/paulcarbone.com\/blog\/tektronix-564-revisited\/","title":{"rendered":"Tektronix 564 Revisited"},"content":{"rendered":"\n

I recently picked up a somewhat rare 3A5<\/a> auto-ranging plugin for the 560 series, and decided to fire up my 564<\/a> to test it out. Since it had been over a year since I powered up my 564, I tried it first in it’s current config, a 3A72<\/a> Dual Trace plugin, and a 3B3<\/a> Timebase. Two problems were readily apparent: <\/p>\n\n\n\n

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  1. The varying intensity – I strongly suspect this has to do with AC ripple, since it holds steady when line triggered<\/li>
  2. The trace is about 2 CM short. <\/li><\/ol>\n\n\n\n

    Here’s a table showing measured supply rail voltages & ripple. All voltages are within spec, but the ripple on the -100 V, 125 V & 300 V lines are out of spec.<\/p>\n\n\n\n

    Rail<\/td>DC Voltage<\/td>Ripple<\/td><\/tr>
    -100 V<\/td>-100 V<\/td>120 mV<\/td><\/tr>
    125 V<\/td>125.5 V<\/td>40 mV<\/td><\/tr>
    300 V<\/td>301 V<\/td>120 mV<\/td><\/tr>
    -12.2 V<\/td>-12.21 V<\/td>2 mV<\/td><\/tr>
    355 V<\/td>357 V<\/td><\/td><\/tr>
    420 V<\/td>435 V<\/td>1.5 V<\/td><\/tr>
    475 V<\/td>493 V<\/td>280 mV<\/td><\/tr>
    -3,300 V<\/td>-3,290 V<\/td>8 V<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

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