647: Difference between revisions

{{Spec | Bandwidth             | DC to 50 MHz with [[10A2|10A2 plug-in]], 45 MHz with [[10A1]] (35 MHz at <5 mV/div) }}

{{Spec | Rise time             | 5.8 ns with 10A2, 7.8 ns with 10A1 (10 ns at <5 mV/div)}}

{{Spec | CRT                  | [[T6470]], 6 cm × 10 cm, 14 kV acceleration }}

{{Spec | Power                 | 108/115/122/216/235/244 V_AC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with [[10A2]] & [[11B2]]  plug-in }}

{{Spec | Operating Temperature | –30 C° to +65 C°}}

{{Spec | Cooling               | AC Fan (only in rack variant) }}

{{Spec | Thermal Protection   | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}

{{Spec | Weight               | 18.4 kg (40.5 lbs) }}

Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]], the 647 uses a lever-actuated cam mechanism.   

Unlike the [[560-series_scopes|560 series]] where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe.   

In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped.   

The 647 has a 140 ns [[delay line]] between the vertical plug-in connector and the input of the vertical amplifier.   

The interface between the vertical plug-in and the mainframe is a 93 Ω controlled-impedance connection.   

This is in contrast to the [[500-series scopes]], which appear to the plug-in as a high impedance.

Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment.   

The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and 14 kV total accelerating voltage.

The HV power supply contains five [[5642]] rectifier tubes: three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, and one for the -2.2 kV CRT grid/blanking.   

The calibrator in the 647 is based on a 4 kHz crystal, which is divided down to 1 kHz ±1 Hz.

Tek 647 10a1 11b2.jpg | 647 with [[10A1]] and [[11B2]]

Tek 647 right.jpg     | 647 Right Side

647 MOD165K.JPG       | 647 with MOD165K