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Tektronix 2445B 150MHz 4CH Oscilloscope

Tektronix 2445B 150MHz 4CH Oscilloscope

Description

The 2445B was trickier because my version of it had a pair of Dallas DS1235YW 64k x 8 (256k) SRAM modules which have a non-replaceable battery actually built in to the potted memory enclosure. (I believe some earlier versions of this scope had a separate battery, similar to my 2432.) The memory is in a standard 28 pin DIL footprint, but physically taller and chunkier than a standard IC package. The good news is that I was able to obtain some suitable replacement NVRAM modules (not the same part number, though – I managed to get some free samples of Maxim DS1230AB, pin-for-pin compatible but faster, however these were only 70 deg C instead of 85 deg C). Suitable similar parts are also still available to buy from Farnell, e.g. Maxim DS1230-Y100 (order code 137 9798, about £25 each – these are 85 deg C rated, so actually a better choice.)

The bad news was that the original NV-RAM modules had been soldered directly into the PCB. Why Tektronix didn’t socket these is beyond me, given they definitely have a finite life: but the fact is they didn’t, and so a lot of careful de-soldering was called for! Actually the modules came out without too much trouble; I was able to get them out without damaging the PCB, using an ordinary spring loaded “solder sucker”. The trick is to ensure that ALL the solder in the through-plated PCB hole is melted before you “suck”, so that all the solder comes out in one go. If you don’t succeed in getting all the solder out first time, so that the plated-through hole is clear of solder, it’s best to actually remake the joint by adding fresh solder and then re-melting and sucking the lot out. The memory pins can then be loosened by pushing them around a little on the solder side of the PCB using a small flat screwdriver blade. This helps to fracture any remaining whiskers of solder and free the pin up within its through-plated PCB hole. By attempting to move the whole memory module from the component side of the board, you can easily see which pins are “free” and which need more work. The golden rule is NEVER to try and pull the module out until all the pins are free – otherwise you risk damaging the PCB.

 

Features

  • 150 MHz bandwidth
  • 2 channels
  • Smapling rate – 100 MSa/s
  • 2 mV  – 5 V/div sensitivity
  • B sweep time base  20 ns/div to 5 ms/div
  • Rise time 2.33 ns  Number of bits – 8
  • Color CRT
  • Frequency Range/ Bandwith 150 MHz
  • Max. Vertical Sensitivity 5 V/div
  • Min. Vertical Sensitivity 2 mV/div
  • Number of Channels 2 CH
  • Record Length “1,024 pts.”
  • Sample Rate 100 MSa/s
  • Type (D/A) Digital

 

Specification

 

Form Factor Benchtop
Bandwidth 150 MHz
Number of Channels 2 ch
Simultaneous Channels 2 ch
Simultaneous Maximum Sampling Rate/ch 100 MSa/s
One ch. only max. sampling rate 100 MSa/s
Max. Single Shot bandwidth 40 MHz
Max. Record Length 1024 pt/sec
Min. Vertical Sensitivity 2 mV/div
Maximum Vertical Sensitivity 5 V/div
Rise time 2.33 ns
Number of Bits 8 bits
Input Impedance 1 MOhm
Input Impedance (alternate) 50 Ohm
Input Coupling AC,DC,GND
Maximum Input Voltage 400 Vrms
Maximum Input#2 (for Impedance #2) 5 Vrms
Main time base – lowest 5 ns/div
Main time base – highest 5 s/div
Timebase accuracy .0015 %
Trigger Source External,Internal
Minimum Glitch Trigger 2 ns
Display Type CRT Monochrome
Display Size 12.7 cm

 

 

 

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