TEK 475A W/O DM44 option? - diyAudio
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Old 4th September 2014, 09:33 AM   #1
rize is offline rize  United States
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Join Date: Feb 2010
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Default TEK 475A W/O DM44 option?

Was model 475A scope ever offered by Tektronix without the DM44 option? I have seen few 475A's on eBay without the DM44. I'm wondering if these are factory originals or refurbished units with a plain cover & DM44 removed?
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Old 4th September 2014, 04:43 PM   #2
1audio is offline 1audio  United States
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Most were sold without the meter. Its a nice option but not as useful as a separate meter.
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Demian Martin
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Old 4th September 2014, 08:01 PM   #3
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Join Date: May 2009
Location: MN, USA
Default DM44 optional

From the 1978 Tek catalog:

475 $3195
475A $3555

475 DM44 $3640

475A DM44 was available as

option -44 add $445

option -45 add $360 (w/o temperature probe)

We had both varieties where I worked. As Demian said it wasn't as good as the better handheld meters. But we always had our scopes on scopemobile carts so this way we never had to go find a meter or a place to put one. One feature that it had was very useful. The DM44 would also display time offset between channels which made it very useful to check for adequate setup time in asynchronous interfaces. CH1 on input, CH2 on output, turn the knob to slide one trace until the edges lined up and the numeric display would tell you the time differential.

Bill R
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Old 4th September 2014, 11:28 PM   #4
rize is offline rize  United States
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Thank you for sharing this information. I have a 475A without the DM44. If I were to one (not sure if I've seen one sold alone) is lot of expertise required to integrate it with the scope?
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Old 5th September 2014, 12:23 AM   #5
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Default Adding a DM44

Don't know, I never had to add one.

The service manual for the DM44 shows the interconnections between the meter unit and the host scope. It doesn't look too hard.
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Old 11th September 2014, 07:49 AM   #6
rize is offline rize  United States
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Join Date: Feb 2010
Location: LA
Default question on TEK differential probe

Are you familiar with differential probe TEK P6046? I'm considering one to test laptop circuits and low power audio amps.

- Will a probe like this accept only proprietary extensions?

- Is it more cost effective to invest in something more modern - input max voltage on this is 25 Volts.

Thanks
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Old 20th September 2014, 06:58 AM   #7
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Join Date: Apr 2010
I`ve played about a bit with a DM44 on a 465, which is very similar. Apart from the electrical side, which is significant, you would also need the cutaway case, or hack the existing one and then the accessories bag wouldn`t fit.
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