561: Difference between revisions

561 (view source)

451 bytes added , 26 July 2022

added description of high power plugin keying

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 The original 561 and RM561 were introduced in 1961.
 Similar to the 560, also [[introduced in 1961]], the 561 has a round CRT.
-It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz. Some later plugins intended for use with the 561A or 561B have higher power requirements and may not be compatible with the 561.
+It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz.
+The later 2- and 3- series plug-ins cannot be used in the 560 or 561, as they consume more power.
+Early, low power, plugins have the nylon guide on their backplane pointing into the plugin, while the later, higher power consuming, plugins have those nylon guides pointing outward.
+The outward pointing guide will bump into the chassis of a 560 or 561, preventing it from fully inserting.
+The 561A and all later 560 series scopes, with higher capability power supplies, have a hole in the chassis that allows the outward pointing nylon guide to clear, allowing full insertion.
 The 561 uses the [[T5032]] CRT, which has a glass envelope. The 561 and later versions also had a front panel calibrator signal for calibrating the plugins to the mainframe.