512: Difference between revisions
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Frequency response extending all the way down to DC | Frequency response extending all the way down to DC | ||
was a distinguishing feature at the time the 512 introduced. | was a distinguishing feature at the time the 512 introduced. | ||
The 512 has two inputs, "A" and "B", each having its own [[Connectors#UHF|UHF]] connector. | |||
The scope can be used with a single input or it can used in "A-B" mode, where the displayed | |||
signal is the difference between the voltage at the A input and the voltage at the B input. | |||
Built-in true differential inputs are also seen in later scopes such as the [[502]], [[503]], and [[504]]. | |||
The input impedance is 1 megohm in parallel with 45 pF. The 512 uses a total of 3kV of acceleration | The input impedance is 1 megohm in parallel with 45 pF. The 512 uses a total of 3kV of acceleration | ||
Revision as of 09:54, 24 August 2011
The Tektronix Type 512 is a 2MHz oscilloscope. Maximum sensitivity is 5 mv/cm. The vertical signal path, fully differential and DC coupled from the front panel A and B inputs to the vertical deflection plates, is as follows:
- Stage 1: differential, 5879 pentodes
- Stage 2: differential, 12AU6 pentodes
- Stage 3: differential, 12AU6 pentodes
- Stage 4: differential, 12AU6 pentodes
- Stage 5: differential, 6AG7 pentodes
Frequency response extending all the way down to DC was a distinguishing feature at the time the 512 introduced.
The 512 has two inputs, "A" and "B", each having its own UHF connector. The scope can be used with a single input or it can used in "A-B" mode, where the displayed signal is the difference between the voltage at the A input and the voltage at the B input. Built-in true differential inputs are also seen in later scopes such as the 502, 503, and 504.
The input impedance is 1 megohm in parallel with 45 pF. The 512 uses a total of 3kV of acceleration voltage: -1500V for the cathode, +1500 for the anode. It weighs 54 pounds and uses 280 watts. It has no thermal cutoff. Up to serial number 2525, the 512 used the 5CPA CRT. After that, the 5ABP CRT was used.
The Tek 512 manual says,
Since 1954, we have manufactured our own timing capacitors with the characteristics needed to maintain sweep-time accuracy and linearity. The capacitance ratio between the capacitors used is accurate within half of one per cent so that the time-base calibrations will be right at all speeds. Most capacitors change value with voltage, temperature, and age. Variation of capacitance with voltage is particularly undesirable because it causes nonlinearity of the time-base sawtooth. Our timing capacitors are especially free from this voltage effect. They also have minimum temperature and aging variations.
Tektronix 512 oscilloscopes with serial numbers 101 through 2146 have a HV power supply that uses a 2kHz oscillation frequency and has no regulation. Starting at serial number 2147, the HV power supply runs at 70kHz and has regulation.