2245
The Tektronix 2245 is a 100 MHz four-channel analog oscilloscope, introduced in 1987 (2245A in 1988).
Channels 1 and 2 are full-featured, whereas 3 and 4 are limited in both deflection factor and coupling, as they are intended mainly for digital and trigger signals.
The 2245 includes features like AUTO SETUP which automatically adjusts vertical, horizontal, and triggering and display controls to provide a stable, triggered display of the waveform in seconds. It offers a dual time base with delayed sweep, and cursor time/voltage measurements with on-screen readout of cursor data and scale factors.
Key Specifications
| Bandwidth | 100 MHz |
|---|---|
| Deflection | CH 1, CH 2: 2 mV/div to 5 V/div in 1-2-5 seq; CH 3, CH 4: 0.1 V/div and 0.5 V/div, all ±2%; BW limit: 20 MHz ±15% |
| Vertical modes | CH1,2,3,4, CH2 Invert, Add, Alt, Chop (625 kHz) |
| Input impedance | 1 MΩ ±1.0% // 20 pF ±1 pF |
| Maximum input | 400 V (DC + peak AC) or 800 V (p-p ac at ≤ 10 kHz) |
| Sweep | A Time Base: 0.5 s/div to 20 ns/div in 1-2-5 seq; B Time Base: 5 ms/div to 20 ns/div in 1-2-5 seq (×10 magnifier to 2 ns/div) |
| Trigger | DC, Noise Reject, HF Reject, LF Reject, AC, TV Line, TV Field |
| Trigger modes | A Mode: Auto Level, Auto, Norm, TV Line, TV Field, Single Seq. B Mode: Runs After Delay, Auto Level, Norm, TV Line (From A Source) |
| Cursors | Time, Volts |
| Interface | Ext Counter/Timer Base Input connector; Ext Z-Axis Input connector |
| CRT | Acceleration 16.4 (−2.7/+13.7) kV |
| Probes | Two P6109 100 MHz ×10 probes, BNC connector with a readout pin |
| Power | 90 − 250 VAC, 48 − 445 Hz; 100 W max. |
Repair Information
Links
Pictures
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2245A
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2245A
CRTs used in the 2245
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CRTs used in the 2245A
| Page | Part nos | Description | Designers | Used in |
|---|---|---|---|---|
| T4656 | 154-0905-00 | CRT | 2245A • 2246 • 2246A • 2247A |
Custom ICs used in the 2245
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| M377 | M377 | 165-2129-03 • 165-2089-06 • 155-2089-05 | amplifier | John Addis | 11A16 • 11A32 • 11A33 • 11A34 • 11A52 • 2245 • 2245A • 2247 • 2247A • 2252 • TDS410 • TDS420 • TDS460 • TDS520D • TDS540D • TDS580D • TDS680C • TDS684C • TDS714L • TDS724D • TDS754D • TDS784D |
Custom ICs used in the 2245A
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0322-00 | M429 | 155-0322-00 | vertical output amplifier | 2245A • 2246 | |
| 156-2654-00 | 156-2654-00 | 156-2654-00 | ECL "fast logic" | 2245A • 2246 | |
| 156-2655-00 | 156-2655-00 | 156-2655-00 | "slow logic" | 2245A • 2246 | |
| 165-2232-01 | 165-2232-01 | 165-2232-01 | buffer amplifier | 2245A | |
| 234-0203-20 | M376-003 | 234-0133-20 • 234-0203-20 • 234-0238-20 | amplifier | 2245A • 2246 | |
| 234-0401-20 | 234-0401-20 | 234-0401-20 • 234-0401-21 | horizontal preamplifier | 2245A • 2246 | |
| M376-004 | M376-004 | 234-0204-20 • 234-0239-30 • 234-0239-31 | trigger | 2245A • 2246 | |
| M377 | M377 | 165-2129-03 • 165-2089-06 • 155-2089-05 | amplifier | John Addis | 11A16 • 11A32 • 11A33 • 11A34 • 11A52 • 2245 • 2245A • 2247 • 2247A • 2252 • TDS410 • TDS420 • TDS460 • TDS520D • TDS540D • TDS580D • TDS680C • TDS684C • TDS714L • TDS724D • TDS754D • TDS784D |