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.
|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)|
- 1990 catalog: $1,095 ($2,280 in 2021 dollars)
- Wireless World, May 1991: 2225, £400; 2225ST, £550
- Tektronix 2225 Analog Oscilloscope - EEVblog 196
- Tektronix 2225 Oscilloscope Teardown and Calibration - EEVblog 208
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.
CRTs used in the 2225
|Page||Part nos||Description||Designers||Used in|
|154-0907-00||154-0907-00||CRT||2225 • 2225ST|
Custom ICs used in the 2225