AM modulated sine wave - Q about oscilloscope triggering

#122642

Apologies to all if this is a *really* basic question but I'm playing with AM modulation but struggling to set up my scope (Rigol DS1052) to trigger properly.

I have an HP 3325A producing 450kHz at 4Vpp. I'm AM modulating it at 1kHz/4Vpp. The output is modulating fine - I can vary the modulation frequency and Vpp and it changes as expected. But I'm struggling how to set up the scope so I get a nice stable AM modulated sine wave on the screen. I don't seem to be setting up the triggering properly - tried a lot of combinations. It jumps around no matter what I try.?

Could some kind soul put me out of my misery please? :-)

thank you

Tony

Re: HP8568B does not start.

#122641

Lou -
Possibly - I'm more familiar with the 8566.  Many times the number of  the CPU board was changed because of chip substitution with no  external function change.

Here are things to check:
1) Are the first 4 digits of the SN the same
2) Are the motherboard part numbers the same
3) Are the CPU numbers the same
4) Are the FIRMWARE versions the same

If 2,2 and 4 are identical, absolutely OK to change.  If 2 and 4 are  the same but 3 is different, probably OK - go to Keysight find a part  site, put in the part number of the EXISTING CPU and see if the  WORKING CPU is a substitute = OK.
If 4 are the same it is also probably OK

Just collect all the data B4 doing the sub.

Cheers!

Bruce


Quoting Lou Blasco <vk3alb@...>:

Show quoted text

Hi All,

I was given a HP8568B that doesn't work.

The 85662 display section is good but it seems the CPU in the analyzer box
does not boot. The lithium battery on A15 leaked and was removed at some
stage in the past. The acid got under the clock module and ate the leads
away. The rest of the board looks ok so I pulled the clock chip and
substituted an external 14.7456MHz oscillator for the purpose of testing
but still nothing from the CPU.

All power supplies measure good. Both INSTR CHECK LEDs remain on. None of
the LEDs on A15 come on ever even if I push the INSTRUMENT PRESET key. All
the yellow leds on both units remain illuminated.

I don't have extender cards, just a 'scope and a meter. However I do have
another functional 8568B.

Is it reasonable to take a good A15 card from one machine and put it in
another for troubleshooting purposes? Besides the terrifying risk that I
might end up with two dead analyzers is there anything else I should
consider?

Regards

Lou
VK3ALB

Re: HP 8970B noisy fan

#122640

It's in the basement of my house will never go beyond 21°C / 70°F. However I don't really know where the 115V are comming from inside the instument. Is there a transformer or power supply for it? The instrument can be powered with 110V to 240V. Does anyone have the schematic od the instrument?

Hi Marc,

since all these instruments can be switched from 110 to 220 volts, to supply 110 volts to the fan it either has a tap on the secondary or its connected across one of the two halves of the primary.

In any case: a 220 volt fan replacing a 110 volt fan will run at a fraction of noise and power consumption, but the large 120x120x25mm types still deliver a decent airflow. Plentyful sufficient if your unit is running in the basement, except maybe for a power supply operating at the edge of its envelope (but these usually have thermal cutouts).

cheers
Martin

HP8568B does not start.

#122639

Hi All,

I was given a HP8568B that doesn't work.

The 85662 display section is good but it seems the CPU in the analyzer box does not boot. The lithium battery on A15 leaked and was removed at some stage in the past. The acid got under the clock module and ate the leads away. The rest of the board looks ok so I pulled the clock chip and substituted an external 14.7456MHz oscillator for the purpose of testing but still nothing from the CPU.?

All power supplies measure good. Both INSTR CHECK LEDs remain on. None of the LEDs on A15 come on ever even if I push the INSTRUMENT PRESET key. All the yellow leds on both units remain illuminated.

I don't have extender cards, just a 'scope and a meter. However I do have another functional 8568B.

Is it reasonable to take a good A15 card from one machine and put it in another for troubleshooting purposes? Besides the terrifying risk that I might end up with two dead analyzers is there anything else I should consider??

Regards

Lou

VK3ALB

Re: HP ic needed

#122638

开云体育

Dave just put into words the whole thought.? ?Right, Dave?

Jim Ford

Sent from my T-Mobile 4G LTE Device

Show quoted text

-------- Original message --------

From: Mike Feher <n4fs@...>

Date: 2/18/22 7:48 PM (GMT-08:00)

To: [email protected]

Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

I do not get it. What is he looking for and how did Dave fix it? 73 - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Friday, February 18, 2022 10:22 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

On February 18, 2022 10:08:38 PM "Andrew Curlik" <kb2lmn@...> wrote:
> I’m looking for the following IC.

? Wow.

? "HI everyone, I'm looking for the IC in the attached photo to fix one of my instruments. Would anyone happen to have one to spare? Will pay a reasonable price, swap, etc. Thanks, I hope everyone is having a nice Friday night."

? There.? Fixed that for ya.

? Sheesh.

????????? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

Re: HP ic needed

#122637

I do not get it. What is he looking for and how did Dave fix it? 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115

Show quoted text

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Friday, February 18, 2022 10:22 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

On February 18, 2022 10:08:38 PM "Andrew Curlik" <kb2lmn@...> wrote:
I’m looking for the following IC.  Wow.

  "HI everyone, I'm looking for the IC in the attached photo to fix one of my instruments. Would anyone happen to have one to spare? Will pay a reasonable price, swap, etc. Thanks, I hope everyone is having a nice Friday night."

  There.  Fixed that for ya.

  Sheesh.

          -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

Re: HP ic needed

#122636

On February 18, 2022 10:08:38 PM "Andrew Curlik" <kb2lmn@...> wrote:
I’m looking for the following IC.  Wow.

  "HI everyone, I'm looking for the IC in the attached photo to fix one of my instruments. Would anyone happen to have one to spare? Will pay a reasonable price, swap, etc. Thanks, I hope everyone is having a nice Friday night."

  There.  Fixed that for ya.

  Sheesh.

          -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

Re: HP 8970B noisy fan

#122634

Marc,

I have several 8970Bs and I don't find them to be objectionably noisy unless the fan bearing is out of oil. I would try to take the fan apart, clean the bearing and add new oil.

Vladan

Re: HP-8753E Which PROM Holds S/N & OPT Info?

#122633

Yes, there is a way to back up the EEPROM. It's in the manual.

Vladan

Re: HP-8753E Which PROM Holds S/N & OPT Info?

#122632

开云体育

Hi Vladan:

Thanks for the information! I am preparing to conduct a A9 CPU Board Transplant. I would like to read this data, and save it before I proceed forward.?

I am not sure there is another way to do this.?

Rich

Show quoted text

On Feb 18, 2022, at 8:57 PM, pianovt via groups.io <pianovt@...> wrote:

?Rich,

There is something wrong if you are troubleshooting on that level. I suspect you may do more damage than good. But, if you really want to proceed, the EEPROM is U402, right next to S400. It's not socketed and the part is either an Atmel or Xicor 28HC64.

Vladan

Re: HP-8753E Which PROM Holds S/N & OPT Info?

#122631

Rich,

There is something wrong if you are troubleshooting on that level. I suspect you may do more damage than good. But, if you really want to proceed, the EEPROM is U402, right next to S400. It's not socketed and the part is either an Atmel or Xicor 28HC64.

Vladan

HP-8753E Which PROM Holds S/N & OPT Info?

#122630

All:

I posted earlier in the week on issue pertaining to my inability to enter a license key for my 8753E. While I solved a definite problem in my A9 CPU Board, the PLCC EEPROM does not contain Serial Number or OPT information. After peeling back a few stickers and looking deeper, it appears I have multiple memory devices which would hold this type of data.?

After looking around the CPU Board I have no less than 4 Dallas DS1610's and 2 AMD AM27S191ASC's. I think the Dallas NVRAM probably contains calibration constant for the VNA. I am leaning towards the two AMD27S19's. Can anyone confirm which chip on the A9 Board houses the data I need to gain access too?

Rich??

Re: Power meter E4416A problem power on

#122629

Displays are really hard to find.? Does anybody know the specs on the display?

Tom

Show quoted text

On 2/18/2022 1:37 PM, jfphp via groups.io wrote:
Another problem with these power meters (4418) : a single tiny dead line on the display. Any idea ?

Re: Power meter E4416A problem power on

#122628

Ok Vladimir thanks

Show quoted text

Le ven. 18 févr. 2022 à 22:00, Vladimir Filip <vf@...> a écrit?:

You can check this Youtube video:?

Solving exactly the same issue as you have. It shows how to check all power supplies and also how to switch on the instrument by shorting specific contacts on main board what should tell you whether your meter or just keypad are faulty.

Vladimir

Dne 18.02.2022 v 21:05 Mohamed Atif napsal(a):

it can be a problem with the keypad or also a problem with the motherboard an electronic component is defective

Le ven. 18 févr. 2022 à 19:15, Richard Parrish <Richard@...> a écrit?:

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:

You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.

Price isn't too bad and you can find them for much less on Ebay.

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.

Best regards

Re: Power meter E4416A problem power on

#122627

开云体育

You can check this Youtube video:?

Solving exactly the same issue as you have. It shows how to check all power supplies and also how to switch on the instrument by shorting specific contacts on main board what should tell you whether your meter or just keypad are faulty.

Vladimir

Dne 18.02.2022 v 21:05 Mohamed Atif napsal(a):

Show quoted text

it can be a problem with the keypad or also a problem with the motherboard an electronic component is defective

Le ven. 18 févr. 2022 à 19:15, Richard Parrish <Richard@...> a écrit?:

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:

You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.

Price isn't too bad and you can find them for much less on Ebay.

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.

Best regards

Re: Power meter E4416A problem power on

#122626

Richard

it can be a problem with the keypad or also a problem with the motherboard an electronic component is defective.

Show quoted text

Le ven. 18 févr. 2022 à 19:15, Richard Parrish <Richard@...> a écrit?:

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:

You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.

Price isn't too bad and you can find them for much less on Ebay.

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.

Best regards

Re: Power meter E4416A problem power on

#122625

it can be a problem with the keypad or also a problem with the motherboard an electronic component is defective

Show quoted text

Le ven. 18 févr. 2022 à 19:15, Richard Parrish <Richard@...> a écrit?:

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:

You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.

Price isn't too bad and you can find them for much less on Ebay.

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.

Best regards

Re: HP 8970B noisy fan

#122624

In my HP5345A I have EBM-Papst 4606N fan. This type is still being produced, it is 115V/20W with 106 CFM but it is 51dB(A)! Counter is specified for operating temperature from 0 to 55 degC. As we don't have 55degC in our homes, I am sure lower CFM will work fine.

The most silent fan I have found is 22dB(A) but just 53CFM - type OA125AP-11-3TB. I am more considering another fan 76CFM with 32dB(A) - type 11938MB-A1K-EA-00. Still not decided which one to buy.

Vladimir

Dne 18.02.2022 v 18:44 John kolb napsal(a):

Show quoted text

Same problem with my HP5245. Love the large display. Do you have a CFM rating to look for?

John? KK6IL@...

On 2/18/2022 1:50 AM, Vladimir Filip wrote:
I am facing similar task to quiet by HP5345A counter, and that is very loud beast. Mouser has very wide selection of 115V fans where I am just now selecting proper one. In Europe you can also try TME.eu, they also have some 115V fans on stock.

Vladimir

Dne 18.02.2022 v 7:51 n8zmTWH@... napsal(a):

I don’t have the 8970B schematic in front of me, but I’d guess that if there is a 115VACfan, it is connect across half of the 230 VAC wired primary of the power transformer.

As for reducing the noise, I have on other HP boxes put a power resistor in series with the fan to reduce the supply voltage. I don’t recall the value I used but the fan nameplate should tell you the current it draws at 115, and you can calculate a rough guess as to the resistor value and power rating. As the HP boxes are designed with the idea of being stuffed in a rack with other instruments also adding heat, and allowing for the air filter to be somewhat clogged with dust, half speed will still move plenty of air assuming you are not operating under those conditions. That should substantially reduce the noise, but the squeaking will probably require some sort of attention. Some light oil might be sufficient to determine if the bearings just are dry. Your decision on what to do at that point.

*From:*[email protected] <[email protected]> *On Behalf Of *Marc73
*Sent:* Friday, February 18, 2022 1:03 AM
*To:* [email protected]
*Subject:* [HP-Agilent-Keysight-equipment] HP 8970B noisy fan

I have an older HP 8970B which is however in good condition. Just one thing is annoying, the fan is very noisy and makes a loud squeaking noise. I guess the bearing has become bad.

As this fan is 115V (even though the insrument is used with 230V) it's not that easy to get such a fan replacement in Europe. Has anyone some advice how to get the fan quiet? Some oil at the right position? So far I did't tear down the fan as I don't want to berak it...

Re: Power meter E4416A problem power on

#122623

Another problem with these power meters (4418) : a single tiny dead line on the display. Any idea ?

On Friday, February 18, 2022, 07:15:40 PM GMT+1, Richard Parrish <richard@...> wrote:

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

Show quoted text

From: [email protected] <[email protected]> on behalf of Mohamed Atif via groups.io <mohammedatif1968@...>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on

?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:
You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.
Price isn't too bad and you can find them for much less on Ebay.
Richard

From:[email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?
Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.
Best regards

Re: Power meter E4416A problem power on

#122622

开云体育

There are on ebay now for as low as $21 and as high as $125.

I bought some a while back.? They work fine but instead of an orange standby LED it has a red LED.

Tom Bryan
N3AJA

On 2/18/2022 1:15 PM, Richard Parrish wrote:

Show quoted text

The switch contacts are laminated into the front panel overlay.? Cheap to manufacture but the failure rate is high after 4-6years of constant service.? The part number is E4418-66502 Key Flexi Circuit ($302 from Keysight) and is used in the E4416, 17, 18, and E4419.? It might be cheaper to buy a defective power meter and scavenge it for the overlay.? You can search ebay for front panel overlay and you should find some for sale.? I've seen prices range from $30 to 125.00 on ebay and they're all selling the same item that is of course, Make in China. . . .? There are some listed now for $27, titled For Agilent/HP E4418A/B /E4416A/E4419A/B/E4417A Press Key Film membrane keypad

Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via groups.io <mohammedatif1968@...>
Sent: Friday, February 18, 2022 5:44 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?

How is the Price of this keybad in eBay.

Le ven. 18 févr. 2022 à 01:05, Mohamed Atif via <mohammedatif1968=[email protected]> a écrit?:

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.

Le jeu. 17 févr. 2022 à 22:38, Richard Parrish <Richard@...> a écrit?:

You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.

Price isn't too bad and you can find them for much less on Ebay.

Richard