2225: Difference between revisions
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==Internals== | ==Internals== | ||
The 2225 power supply uses a [[120-1630-00]] mains-frequency toroidal transformer to produce a 60 V DC supply, followed by two TL494-driven switching regulators. | The 2225 power supply uses a [[120-1630-00]] mains-frequency toroidal transformer to produce a 60 V DC supply, followed by two [[TL494]]-driven switching regulators. | ||
The scope uses transistor array ICs like the CA3102, [[CA3046]] and CA3054, but no Tek custom ICs. | The scope uses transistor array ICs like the CA3102, [[CA3046]] and CA3054, but no Tek custom ICs. |
Latest revision as of 05:20, 15 July 2024
The Tektronix 2225 is a 50 MHz dual-channel analog scope.
It has a single timebase with a ×5/×10/×50 magnifier that allows displaying normal and magnified traces together on the screen, but has no delay feature, only an X position control.
The Y inputs feature a ×10 magnifier that decreases bandwidth to 5 MHz but increases sensitivity to 0.5 mV/Div.
There is a 2225ST model that adds digital storage. Further information needed
A 2205 equipped with option 07 (internal DC inverter) can be powered ≥3 hours from an 1104A battery.
The 2225 was known internally as Euroscope. It was initially developed in Hoddesdon, UK and then produced in Tek's Heerenveen facility.
Key Specifications
Rise time | ≤7 ns (≤70 ns with ×10 vertical magnification) |
---|---|
Bandwidth | ≥50 MHz (≥5 MHz with ×10 vertical magnification) |
Deflection | 5 mV/Div to 5 V/Div, 1–2–5; 500 μV/Div with ×10 vertical magnification; variable ≥2.5:1 |
Input impedance | 1 MΩ // 25±2 pF |
Maximum Safe Input | 400 V (DC + peak AC) or 800 Vp-p AC to ≤10 kHz |
Trigger sensitivity | 0.3 Div or 40 mV @ 5 MHz, 1 Div or 200 mV @ 5 MHz |
Sweep | 0.5 s/Div to 50 ns/Div, 1−2−5; ×10 Mag. down to 5 ns/Div; variable ≥2.5 : 1 |
Z input | 5 V causes noticeable modulation (positive decreases intensity), DC to 5 MHz; max. 400 V (DC + peak AC) or 800 Vp-p AC to ≤10 kHz |
CRT | 154-0907-00 tube, 80 × 100 mm² display, P31 phosphor, 12.6 kV acceleration |
Power | 95–128 or 185–250 VAC, 48–440 Hz, ≤70 W (80 VA) |
Features |
|
Options | (selected) |
Prices
- 1990 catalog: $1,095 ($2,280 in 2021 dollars)
- Wireless World, May 1991: 2225, £400; 2225ST, £550
Links
- Tektronix 2225 Analog Oscilloscope - EEVblog 196
- Tektronix 2225 Oscilloscope Teardown and Calibration - EEVblog 208
Internals
The 2225 power supply uses a 120-1630-00 mains-frequency toroidal transformer to produce a 60 V DC supply, followed by two TL494-driven switching regulators.
The scope uses transistor array ICs like the CA3102, CA3046 and CA3054, but no Tek custom ICs.
Pictures
2225
2225ST
Components
Some Parts Used in the 2225
Part | Part Number(s) | Class | Description | Used in |
---|---|---|---|---|
154-0907-00 | 154-0907-00 | CRT | CRT | 2225 • 2225ST |
TL494 | Monolithic integrated circuit | PWM switch-mode controller | 2225 • 7250 |