The Tektronix 2225 is a 50 MHz dual-channel analog scope.

Tektronix 2225
50 MHz dual-channel scope
Tektronix 2225

Produced from 1987 to 1992

Manuals

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
  • X-Y mode (± 3° from DC to 150 kHz)
  • Calibrator (0.5 V ±5% into 1 MΩ Load; 1 kHz ±20%)
Options (selected)
  • 1R – Rackmount kit
  • 02 − Front Cover and Pouch
  • 07 – Internal DC Inverter (for 11.8–30 VDC supply)
  • 30 – Opt.07 + 1104 battery
  • 18 – P6122 probes instead of standard P6103

Prices

  • 1990 catalog: $1,095 ($2,280 in 2021 dollars)
  • Wireless World, May 1991: 2225, £400; 2225ST, £550

Links

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