The Tektronix 2445 is a high-performance, 150 MHz, four-channel analog oscilloscope designed for general-purpose, laboratory, and field service applications. Known for its advanced CRT readout, cursor measurement system, and rugged construction, the 2445 provides detailed waveform analysis with exceptional precision.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (optional, Option 10) |
| Display | CRT (Green Phosphor, P31, with CRT Readout) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 V to 250 V AC, 48 Hz to 440 Hz, 120 W max |
| Operating Temperature | -15 °C to +55 °C |
| Weight | 9.3 kg |
Vertical System
| Parameter | Value |
|---|---|
| Bandwidth (-3 dB) | 150 MHz |
| Rise Time | 2.33 ns |
| Number of Channels | 4 |
| Deflection Factor Range (CH 1 & CH 2) | 2 mV/div to 5 V/div |
| Deflection Factor Range (CH 3 & CH 4) | 0.1 V/div and 0.5 V/div |
| Vertical Accuracy | ±2% |
| Input Impedance (CH 1 & CH 2) | 1 MΩ || 15 pF (selectable to 50 Ω) |
| Input Impedance (CH 3 & CH 4) | 1 MΩ || 15 pF |
| Maximum Input Voltage (1 MΩ) | 400 V (DC + peak AC) |
| Maximum Input Voltage (50 Ω) | 5 V RMS |
| Input Coupling (CH 1 & CH 2) | AC, DC, GND |
| Input Coupling (CH 3 & CH 4) | DC only |
| Vertical Display Modes | CH 1, CH 2, ADD, ALT, CHOP, CH 3, CH 4 |
| Invert Channel Capability | CH 2 |
| Channel Isolation (Crosstalk) | 100:1 or greater at 100 MHz |
| Common Mode Rejection Ratio (CMRR) | At least 20:1 at 50 MHz |
| Bandwidth Limit (-3 dB) | 20 MHz |
| Vertical Chop Frequency | 1 MHz |
| AC Coupling Low-Frequency Limit (-3 dB) | 10 Hz or less (1X probe), 1 Hz or less (10X probe) |
| Probe Scale Factor Sensing | Automatic detection of 1X, 10X, or 100X coded probes |
| Input Capacitance (CH 1 & CH 2) | 15 pF ± 2 pF |
| Input Capacitance (CH 3 & CH 4) | 15 pF ± 3 pF |
Horizontal System
| Parameter | Value |
|---|---|
| A Sweep Rate Range | 20 ns/div to 0.5 s/div |
| B Sweep Rate Range | 20 ns/div to 50 ms/div |
| Sweep Rate Accuracy | ±0.7% |
| Sweep Magnifier | x10 |
| Horizontal Display Modes | A, A INTEN, ALT, B (Delayed) |
Trigger System
| Parameter | Value |
|---|---|
| Trigger Modes | Auto Level, Auto, Normal, Single Sequence |
| Trigger Sources | CH 1, CH 2, CH 3, CH 4, Line, Vertical |
| Trigger Coupling Modes | AC, DC, HF Reject, LF Reject, Noise Reject |
| Trigger Level Range | ±18 times the VOLTS/DIV setting (CH 1 & CH 2) |
| Trigger Sensitivity (CH 1 & CH 2, DC Coupled) | 0.35 div from DC to 30 MHz, 1.5 div at 150 MHz |
X-Y Operation
| Parameter | Value |
|---|---|
| X-Axis Input Source | CH 1 |
| Y-Axis Input Source | CH 2 |
| X-Axis Bandwidth | DC to 3 MHz |
| X-Y Phase Difference | Within 3° from DC to 1 MHz |
CRT & Display
| Parameter | Value |
|---|---|
| CRT Size | 8 cm x 10 cm |
| Phosphor Type | P31 (standard) |
| Graticule Illumination Control | Adjustable |
| Trace Rotation Adjustment | Front panel screwdriver-adjustable |
Cursor & Readout System
| Parameter | Value |
|---|---|
| CRT Readout Capability | Volts, Time, Frequency, Phase, Ratio, Trigger Level |
| Cursor Measurement Functions | ΔV, Δt, 1/Δt (frequency) |
Auxiliary Outputs & Calibrator
| Parameter | Value |
|---|---|
| Calibrator Output Voltage (Amplitude) | 0.5 V square wave (±1%) into high impedance |
| Calibrator Output Frequency | 1 kHz (±1%) |
| CH 2 Vertical Signal Output Voltage | 20 mV/div into 50 Ω |
| A Gate Output Voltage | TTL compatible (active high) |
| B Gate Output Voltage | TTL compatible (active high) |
Power Supply
| Parameter | Value |
|---|---|
| AC Input Voltage Range | 90 V to 250 V AC |
| AC Input Frequency Range | 48 Hz to 440 Hz |
| Power Consumption | 120 W maximum |
Physical Specifications
| Parameter | Value |
|---|---|
| Width | 338 mm |
| Height | 137 mm |
| Depth | 445 mm |
| Net Weight | 9.3 kg |
| Shipping Weight | Approx. 12.7 kg |
| Cooling System Type | Forced-air cooling (fan) |
Environmental & Reliability
| Parameter | Value |
|---|---|
| Operating Temperature Range | -15 °C to +55 °C |
| Non-Operating Temperature Range | -62 °C to +85 °C |
| Operating Altitude Limit | Up to 4,600 m (15,000 ft) |
| Non-Operating Altitude Limit | Up to 15,200 m (50,000 ft) |
| Vibration Resistance | Meets MIL-T-28800C, Class 3 |
| Shock Resistance | Meets MIL-T-28800C, Class 3 |
Display
| Parameter | Value |
|---|---|
| CRT Accelerating Voltage | 16 kV |
| Beam Finder | Compresses the display to within the graticule area and intensifies the trace |
| Graticule Type | Internal, parallax-free |
Options
| Parameter | Value |
|---|---|
| Option 01 (Digital Multimeter) | 4.5-digit autoranging DMM, measures DCV, ACV, Ohms, and temperature |
| Option 05 (TV Triggering) | Compatible with SECAM, NTSC, and PAL standards; provides TV Field 1, Field 2, and Line Sync |
| Option 06 (Counter/Timer/Trigger - CTT) | Provides 9-digit frequency counter, period, and time interval measurements up to 150 MHz |
| Option 09 (Word Recognizer) | Adds a 17-bit word recognizer probe (16 data + 1 clock) to the Counter/Timer/Trigger |
| Option 10 (GPIB Interface) | Provides full remote programmability conforming to IEEE-488.1 |
| Option 11 (Probe Power) | Provides power for active probes (+5 V, -5 V, +15 V, and -15 V) |
| Option 1R (Rackmount) | Configures the instrument for installation in a standard 19-inch rack |
Compliance
| Parameter | Value |
|---|---|
| Safety Standards | Certified to UL 1244, CSA C22.2 No. 231 |
| Military Specifications | Meets MIL-T-28800C, Class 5 environmental limits |
Z-Axis System
| Parameter | Value |
|---|---|
| Z-Axis Input Impedance | 9.1 kΩ |
Calibrator
| Parameter | Value |
|---|---|
| Calibrator Loop Current | 10 mA (into shorting loop) |
Technology
Analog
Applications
Electronic testing and measurement