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Hi Dirk,

You have a few options, each with pros & cons:

1) Use a differential probe to measure across each phase.

2) Use a scope with isolated channels.  Several handheld models offer that capability, plus the Tektronix TPS2000 series instruments.

3) Measure each phase relative to ground and use maths function on the scope, or offline ona PC) to derive the phase measurements.

In any case DON'T cut your scope's ground lead and float the instrument - it's dangerous and violates numerous safety standards.

Tektronix have an application note on making floating measurements.  You can download it from: http://www.tek.com/Measurement/App_Notes/3M_17773/eng/3MW_17773_0.pdf

Cheers!

I would like to know if Tektronix does have GPS disciplined Rubidium oscillator devices  + antenna + surge protection + redundancy option

thanks!

I am sorry, Tektronix do not have GPS disciplined oscillator devices and I have checked in Farnell range as well with other our supplier.

Thank you for enquiry.

Best regards,

Farnell technical

Hi Devinder,

Tektronix offer a line of frequency counter/timers - the FCA3000FCA3000 & MCA3000 - but not the Rubidium oscillator devices you are seeking.

Try contacting Quartzlock Ltd.  They may have a product that meets your needs. http://quartzlock.com/

Trevor

Trevor J. Smith|  Technical Marketing Manager  |  Phone: +44 (0)1344 392225 |  Mobile: +44 (0)7836) 516853  |  www.tektronix.com<http://www.tektronix.com/>

For Tektronix legal entity information and registration details go to: www.tektronix.com/entities<http://www.tektronix.com/entities

Hello,

I have Fluke 5102B calibrator,which is working fine with its D.C ranges but it does not works with its A.C. ranges.The o/p is exactly 2.14 times higher than the programmed value.Readings are as follows:

Programmed values at 1kHz           o/p @fluke 8060A DMM

100mV                                              0.2128V,967.7Hz

1V                                                     2.135  V,967.7Hz

10V                                                   21.40  V,967.6Hz

100V                                                 213.9  V,967.7Hz

400V                                                 867.2  V,967.5Hz

100microAmps                                  0.2136microAmp,967.7Hz

1mA                                                   2.133mA

10mA                                                 21.36mA

100mA                                               213.1mA

500mA                                              1070.0mA

It's Ohm ranges are showing stable & correct for 10,100,1k,10k Ohms,but for 100k,1M,10M does not stable.It varies around its expected values.

For 100kOhms o/p varies between 99.79 to 100.22kOhms same for 1M &10M

Manufacturing date of the calibrator is around 1987.

Can you guide me which component exactly I have to replace.

Thanks with regards

KIRAN

xepa08@gmail.com

Hi Kiran,

            I am sorry,I was away, unable to reply you and regarding problem with Fluke calibrator 5102 B, I am sorry,you have to contact Fluke and their contact Tel 01603256690, because we do not deal with any repair or calibration.

Thank you for your enquiry,

Regards,

Devinder Sohal,

Farnell technical,

Hi Jim,

I am trying to calculate a Mean Time Between Failures (MTBF) for a system using MIL HDBK 217F, unfortunately I still have a few components left which I can't seem to find the MTBF for, nor do I know how I should categorise them to use the MIL HDBK to get an MTBF for them.  The components I am struggling with are:

1. Octal Buffer, Line Driver.

2. Amp Isolation

3. Buffer / Line Driver

4. Temp Sensor

5. Power Distribution Switch

6. CPCI Bus Hot Swap Controller

I have included links for the components below.  If you could tell me what section these fall under in the MIL HDBK or anything else that would help me predict the MTBF you would be doing me a huge favour.

http://au.element14.com/texas-instruments/sn74hct541dw/ic-octal-buffer-line-driver-smd/dp/9592059?Ntt=959-2059

http://au.element14.com/texas-instruments/iso124u/ic-amp-isolation-smd-soic28-124/dp/1212426?Ntt=121-2426

http://au.element14.com/texas-instruments/sn74ahct1g125dbvr/ic-74ahct-single-gate-smd/dp/1105927?Ntt=1105927

http://au.element14.com/texas-instruments/tmp275aidgkt/ic-temp-sensor-5-5v-smd-msop8/dp/1470503?Ntt=1470503

http://au.element14.com/texas-instruments/tps2024dg4/power-distribution-switch-soic8/dp/1235040?Ntt=1235040

http://www.linear.com/product/LTC4244

Thank for your time,

Peter

HI Jim

Would you have any recommendations on a replacement for the Fluke 8920A true RMS RF voltmeter ?

My requirements are true RMS millivolt measurements centered around the 400kHz region.

The nearest I have found is the Rohde&Schwarz URE3 but this is costly, and the Fluke 85RF probe adaptor is not sensitive enough.

Any ideas suggestions ( that don't involve buying second hand 8920A's ) welcome.

Regards David Mordey.

Jim,

Can you tell me how to capture the milliseconds time to trip RCD Circuit Breakers? I believe you would need a trigger point to start the timer and store the time value once the shunt trip has opened the CB. Can this be done without a Power Oscilliscope?

I have a Fluke 9100 Calibrator but it is limited for RCD tests.

Basil

Jim,

I would like some help in trying to find the right firm to develop a light meter that currently is not manufactured by any vendor. We have some very specific requirements for a meter used in a niche business.

~Cody