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Beskrivning
TV waveform monitors are specialized oscilloscopes used for monitoring TV signals in studios and transmitters.
Tek began building glass CRTs with rectangular envelopes in 1959. They were first used in the RM561 oscilloscope and the 527 and rack mount waveform monitors that first appeared in the 1961 catalog. The 527 and RM527 were also the first waveform monitors to be offered in two physical configurations, a 5.25" high rack mount and a 10.5" half-rack wide cabinet model, popular because it enabled two camera control units to be housed in the same rack, useful for operating in cramped spaces.
The 527 used mostly vacuum tubes, its single transistor producing a calibrator waveform (as the sole transistor in the 526 functioned as a test circle oscillator). It employed the then-new muffin fans that moved a decent amount of air, but could fit in the limited rack height. It employed a "back porch clamp" placing the video blanking level on the screen at a location determined by the vertical position control, simplifying level measurements. The first 527s were delivered for the new KNXT-TV CBS Technical Operating center opening in Los Angeles in early 1960.
In the 1960s, as transistors began to equal and exceed vacuum tubes in performance, some projects were canceled because they were judged to poorly fit into the anticipated future. However, those design efforts often later became valuable assets. The 527 appeared at a time when color TV was taking off, but it wasn't until well after the 527 appeared on the market that a mostly solid-state waveform monitor could be built. The need to use test signals buried in the vertical blanking interval necessitated attention to CRT and amplifier design in order to achieve the needed writing speed performance. The 529 replaced the 527 and employed a transistor-vacuum tube hybrid technique to achieve the needed voltage swing performance using a monoaccelerator CRT. The accelerating voltage was 5.5KV, later increased to 6.6KV, in order to achieve the requisite brightness. Many features such as the back porch clamp were both simplified and improved over previous implementations. The 529 and R529 enjoyed a product lifetime of more than 11 years. The museum has a 529 waveform monitor and 520A vectorscope on display.
Tek began building glass CRTs with rectangular envelopes in 1959. They were first used in the RM561 oscilloscope and the 527 and rack mount waveform monitors that first appeared in the 1961 catalog. The 527 and RM527 were also the first waveform monitors to be offered in two physical configurations, a 5.25" high rack mount and a 10.5" half-rack wide cabinet model, popular because it enabled two camera control units to be housed in the same rack, useful for operating in cramped spaces.
The 527 used mostly vacuum tubes, its single transistor producing a calibrator waveform (as the sole transistor in the 526 functioned as a test circle oscillator). It employed the then-new muffin fans that moved a decent amount of air, but could fit in the limited rack height. It employed a "back porch clamp" placing the video blanking level on the screen at a location determined by the vertical position control, simplifying level measurements. The first 527s were delivered for the new KNXT-TV CBS Technical Operating center opening in Los Angeles in early 1960.
In the 1960s, as transistors began to equal and exceed vacuum tubes in performance, some projects were canceled because they were judged to poorly fit into the anticipated future. However, those design efforts often later became valuable assets. The 527 appeared at a time when color TV was taking off, but it wasn't until well after the 527 appeared on the market that a mostly solid-state waveform monitor could be built. The need to use test signals buried in the vertical blanking interval necessitated attention to CRT and amplifier design in order to achieve the needed writing speed performance. The 529 replaced the 527 and employed a transistor-vacuum tube hybrid technique to achieve the needed voltage swing performance using a monoaccelerator CRT. The accelerating voltage was 5.5KV, later increased to 6.6KV, in order to achieve the requisite brightness. Many features such as the back porch clamp were both simplified and improved over previous implementations. The 529 and R529 enjoyed a product lifetime of more than 11 years. The museum has a 529 waveform monitor and 520A vectorscope on display.
Tis 2 apr 15:25
Tektronix Type RM 527 Waveform Monitor Sveriges Radio
Slutpris
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1 000 kr
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