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Re: TM 500 Digital Multimeter Recommendations

Dave Seiter
 

You could get a Tek handheld DMM; I've had mine since about 1985 (the only Tek item I've ever purchased new!), and it still works perfectly.
-Dave

On Thursday, August 6, 2020, 10:52:27 AM PDT, Stephen <stephen.nabet@gmail.com> wrote:

Ooh, the DM501A has soft buttons?  I didn’t realize that.  I hate soft buttons.
From the 2 last responses, it appears that since no DM504 are currently available anywhere, and since I don’t  own a TM500x, I’m either gonna get a DM501 with the waffle rotary switch, or no Tektronix DM at all...
Are these good at least?


Re: 11301 Keep Alive BatteryCchange-out ?

Clark Foley
 

Bill,

If you are getting a diagnostic message to replace the battery, then do it. Remember to power off first. The battery is a very tight fit; so, be careful and be gentle. If you have a clean power on self test, then there is no need to replace the battery.

The scope will operate with a dead battery but the last settings prior to power off will be lost. If you ran the EA (enchanted accuracy) to trim the offsets, that will be lost as well with a dead battery. The battery allows you to resume operation between power cycles with no fuss.

Factory cal constants are stored in EEPROM. They do not depend upon the battery.

Check the service documentation if you are nervous.

The memory expansion board (non-A model upgrade and all A models) also has a battery that saves the 10 setups and the two waveforms. Yes! It can store and display waveforms from memory, but that's another topic.
I have been amazed at the life of the battery. Mine lasted more than 30 years! That's a lot of margin over the 5 year guaranteed life.

Regards,
Clark


Re: TM 500 Digital Multimeter Recommendations

Renée
 

same here -no soft buttons on my 501A. it has worked well for me for many years and hope that continues.....just have to pay attention when pushing buttons!!! Had a 501 the  rotary switch started to have issues....was not my problem belonged to the company, I sent it to the RTC ( repair/test/cal) dept....it never returned.....I ended up using Fluke handhelds as replacement to get the job done......otherwise depending what you are doing maybe a couple of handhelds may be easier to obtain, less expensive and sometimes more appropriate.....sadly they do not fit the frame however, frees the slot for something else <grin>....
Renée

On 8/6/20 10:58 AM, Andy Warner wrote:
Nope, the DM501A does not have soft buttons (at least neither of mine do.)

I'm coming over as a champion of the DM501A here, I'm far from that - but
they can be made to work well enough and are not made of unobtainium.

On Thu, Aug 6, 2020 at 12:52 PM Stephen <stephen.nabet@gmail.com> wrote:

Ooh, the DM501A has soft buttons? I didn’t realize that. I hate soft
buttons.
From the 2 last responses, it appears that since no DM504 are currently
available anywhere, and since I don’t own a TM500x, I’m either gonna get a
DM501 with the waffle rotary switch, or no Tektronix DM at all...
Are these good at least?




Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 10:31 AM, Larry McDavid wrote:

Interleaved

Just because a DMM has manual range-select buttons or knobs does not
mean it cannot also autorange. The Tek DM 502A DMM can do both--
Yes, I had missed that part, and Vince pointed that out to me.

it has real (not softkey) push button switches to select ranges but it also has
an autorange push button. True, I do usually use it in autorange mode
but manual selection is available.
I must’ve probably misunderstood a previous post that mentioned soft buttons.

The DM 502A also has a push button and input connector for a 100 Ohm
platinum resistance thermometer (PRT) temperature probe. The probe tip
is relatively low thermal mass and the temperature response is quick.
This probe has a long and quite flexible cable. Note that other Tek DM
modules may use a different, thermistor-type probe.
Nice! I see the 501/A also has that temp feature. But I can see a different connector.

My "GoTo" bench DMM is a HP 34401A Multimeter. Normally, it autoranges
but a push button changes mode to allow manual range selection. Manual
push buttons select ac and dc voltage and current and 2 and 4-wire
resistance measurement. On power-up, it defaults to dc voltage but that
may even be configurable. The Tek DM 502A (not the Tek DM 502) is almost
as versatile but is 3-1/2 digit.
My “Go to” bench MM is not digital actually. It’s a tube driven, very high impedance (7.5Mohm) old MM that can also measure up to 1.6 KVDC, or 32 KVDC with the appropriate probe; but I don’t have the probe for it, and I can’t find a 1500 Mohm High Voltage probe that it needs either. It can also, with it’s high frequency probe (that I don’t have either), measure high frequencies AC up to 600Mhz. But most of the time I use a handheld Fluke or a Velleman DMM.

The Tek DM 504A is 4-1/2 digit and a nice instrument but availability is
low.
Yes, that’s the problem. Do I “need” another DMM? Not really. I just find it nice to have one to add to my 500 series plugin “library”. I just want to find the right one.

Larry


On 8/6/2020 12:10 PM, Stephen wrote:
On Thu, Aug 6, 2020 at 07:54 AM, Larry McDavid wrote:


I have a Tek DM502A that works well. It is 3-1/2 digit but autoranging
and has a separate banana jack input for current measurement.
Are you sure that it’s auto-ranging? I’ve never had one, but from the
pictures it seems that you have to manually select the range you’re
measuring...
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: TM 500 Digital Multimeter Recommendations

Larry McDavid
 

Just because a DMM has manual range-select buttons or knobs does not mean it cannot also autorange. The Tek DM 502A DMM can do both--it has real (not softkey) push button switches to select ranges but it also has an autorange push button. True, I do usually use it in autorange mode but manual selection is available.

The DM 502A also has a push button and input connector for a 100 Ohm platinum resistance thermometer (PRT) temperature probe. The probe tip is relatively low thermal mass and the temperature response is quick. This probe has a long and quite flexible cable. Note that other Tek DM modules may use a different, thermistor-type probe.

My "GoTo" bench DMM is a HP 34401A Multimeter. Normally, it autoranges but a push button changes mode to allow manual range selection. Manual push buttons select ac and dc voltage and current and 2 and 4-wire resistance measurement. On power-up, it defaults to dc voltage but that may even be configurable. The Tek DM 502A (not the Tek DM 502) is almost as versatile but is 3-1/2 digit.

The Tek DM 504A is 4-1/2 digit and a nice instrument but availability is low.

Larry

On 8/6/2020 12:10 PM, Stephen wrote:
On Thu, Aug 6, 2020 at 07:54 AM, Larry McDavid wrote:


I have a Tek DM502A that works well. It is 3-1/2 digit but autoranging
and has a separate banana jack input for current measurement.
Are you sure that it’s auto-ranging? I’ve never had one, but from the pictures it seems that you have to manually select the range you’re measuring...
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 09:44 AM, Eric wrote:


I can confirm that the 502A is auto ranging. You can manualy set the
ranges but the bottom button on the left is "auto" this also gives you a
20M ohm input to the meter which is nice
Yes, someone has pointed out that the auto was selectable. And it is nice.

I was able to find the 502A
was a lot more plentiful on the auctions I wanted to get a few of them
as I was watching multi rail power supplies in scopes and curve tracers.
They are indeed what I see the most often.

in terms of repair out of 6 units 5 caled to spec really easy and nicely.
That’s a good sign.

the 6th unit DC was OK, AC there was some cap drift and I am not able to
get the high frequency quite there. It wants 19.4 I can only get 18.8.
only other issues I have had was 3 caps on the board I started changing
due to leakage and one of the units had a bum voltage regulator on the
15V supply. so far other then cleaning and lubing of switches of course
those are the only repairs the 5 working units have needed. Oh the
option deletes the temp probe and associated circuitry on the 502A.

Zen
Thank you for these info


Re: TM 500 Digital Multimeter Recommendations

 

On Thu, Aug 6, 2020 at 10:25 PM, Raymond Domp Frank wrote:



I already did. When you have to manually select the range, it’s not
“auto-ranging.
I can't imagine you did. You have the option to either use Autorange or set
Manual ranging. The manual clearly shows that.
I can't see why my text "I can't imagine you did" makes me call you a liar and your text "I already did" doesn't make you one since the manual clearly shows the answer to your question.
In this group, we don't like bellicose behavior and according to our etiquette we don't call each other names.
I didn't call you (out as) a liar. I'll put it down to you being a new member.

Raymond
I consider this non-issue closed and will not respond to further messages re. this from you.


Re: TM 500 Digital Multimeter Recommendations

Eric
 

I can confirm that the 502A is auto ranging. You can manualy set the ranges but the bottom button on the left is "auto" this also gives you a 20M ohm input to the meter which is nice. I was able to find the 502A was a lot more plentiful on the auctions I wanted to get a few of them as I was watching multi rail power supplies in scopes and curve tracers. in terms of repair out of 6 units 5 caled to spec really easy and nicely the 6th unit DC was OK, AC there was some cap drift and I am not able to get the high frequency quite there. It wants 19.4 I can only get 18.8. only other issues I have had was 3 caps on the board I started changing due to leakage and one of the units had a bum voltage regulator on the 15V supply. so far other then cleaning and lubing of switches of course those are the only repairs the 5 working units have needed. Oh the option deletes the temp probe and associated circuitry on the 502A.

Zen

On 8/6/2020 3:10 PM, Stephen wrote:
On Thu, Aug 6, 2020 at 07:54 AM, Larry McDavid wrote:

I have a Tek DM502A that works well. It is 3-1/2 digit but autoranging
and has a separate banana jack input for current measurement.
Are you sure that it’s auto-ranging? I’ve never had one, but from the pictures it seems that you have to manually select the range you’re measuring...


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 09:25 AM, Raymond Domp Frank wrote:

I can't imagine you did.
Please do your best not to call liars people you don’t know.
Thank you.


Re: TM 500 Digital Multimeter Recommendations

 

On Thu, Aug 6, 2020 at 10:15 PM, Stephen wrote:



Please explain in what sense "by modern acceptance of the term", it
"clearly
isn't autoranging".


For more info, have a look at the Electrical Characteristics in the manual, available at TekWiki.

I already did. When you have to manually select the range, it’s not “auto-ranging.
I can't imagine you did. You have the option to either use Autorange or set Manual ranging. The manual clearly shows that.
Strange that "DM502A Autoranging DMM" and the writing "Auto" on the front of the meter didn't make you wonder.

Raymond


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 08:29 AM, Vince Vielhaber wrote:


On the 502A you can select a range or select autorange.

Vince - K8ZW.
Ooh, ok. That makes more sense then,
Thanks


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 08:58 AM, Raymond Domp Frank wrote:

Please explain in what sense "by modern acceptance of the term", it "clearly
isn't autoranging".
I already did. When you have to manually select the range, it’s not “auto-ranging.


Re: AWG2021 Sample Waveform Library

Szabolcs Szigeti
 

Thank you for sharing this.

Szabolcs

Martin Hodge <mhodge@innocent.com> ezt írta (időpont: 2020. aug. 5., Sze
19:56):

Since there were no objections, I've gone ahead and uploaded them to the
files section.

https://groups.io/g/TekScopes/files/AWG2011-2021_Sample_Waveform_Library-063-2169-00.zip




Re: TM 500 Digital Multimeter Recommendations

 

On Thu, Aug 6, 2020 at 09:45 PM, Stephen wrote:


On Thu, Aug 6, 2020 at 08:22 AM, Raymond Domp Frank wrote:



On Thu, Aug 6, 2020 at 09:10 PM, Stephen wrote:



Are you sure that it’s auto-ranging?
The nameplate shows "DM502A Autoranging DMM"...

Raymond
Maybe so, but it’s clearly not. Not by modern acceptance of the term anyway.
Please explain in what sense "by modern acceptance of the term", it "clearly isn't autoranging".
For more info, have a look at the Electrical Characteristics in the manual, available at TekWiki.

Raymond


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 08:22 AM, Raymond Domp Frank wrote:


On Thu, Aug 6, 2020 at 09:10 PM, Stephen wrote:


Are you sure that it’s auto-ranging?
The nameplate shows "DM502A Autoranging DMM"...

Raymond
Maybe so, but it’s clearly not. Not by modern acceptance of the term anyway.


Re: TM 500 Digital Multimeter Recommendations

Vince Vielhaber
 

On the 502A you can select a range or select autorange.

Vince - K8ZW.

On 08/06/2020 03:22 PM, Raymond Domp Frank wrote:
On Thu, Aug 6, 2020 at 09:10 PM, Stephen wrote:


Are you sure that it’s auto-ranging?
The nameplate shows "DM502A Autoranging DMM"...

Raymond


Re: TM 500 Digital Multimeter Recommendations

 

On Thu, Aug 6, 2020 at 09:10 PM, Stephen wrote:


Are you sure that it’s auto-ranging?
The nameplate shows "DM502A Autoranging DMM"...

Raymond


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 07:54 AM, Larry McDavid wrote:


I have a Tek DM502A that works well. It is 3-1/2 digit but autoranging
and has a separate banana jack input for current measurement.
Are you sure that it’s auto-ranging? I’ve never had one, but from the pictures it seems that you have to manually select the range you’re measuring...


Re: TM 500 Digital Multimeter Recommendations

Larry McDavid
 

I have a Tek DM502A that works well. It is 3-1/2 digit but autoranging and has a separate banana jack input for current measurement. The DM502A has ac RMS, dBm, dBV and measures temperature with an external platinum resistance temperature probe plugged into the front-panel connector. The "A" version seems to correct most of the problems with the original DM502 version and is more available than the DM504A.

I am unfamiliar with the DM502 and the DM504A, but the DM502A, while 3-1/2 digits, uses quite readable 7-segment red LED displays.

Larry

On 8/6/2020 5:18 AM, Göran Krusell wrote:
Hi, do not pick the DM501 or the DM502. If you are measuring voltage and without thinking, like I often do, would turn the switch into the current range your object will be shorted by the multimeter and perhaps damage your object. This has been pointed out by another member some time ago.
Göran
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: TM 500 Digital Multimeter Recommendations

Stephen
 

On Thu, Aug 6, 2020 at 06:52 AM, Tom Norman wrote:

For TM506, the DM511 wouldn't be a
bad choice in my opinion.

Tom
Probably, but it’s also harder to come by, and probably much more expensive. Especially when you have to add the shipping cost and import taxes to Europe on top.

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