HP 54121T + 54121A

[Richard Klingler]

Evnin'

I'm looking for a refurbished scope and came across the 54121T + 54121A
which are sold quiet cheap and offer high sample rates...

Is this combination only meant for RF designs or high speed digital
circuits as the 54121A is 50 Ohms only...

Or is there a test module where I can capture higher voltages also
with higher impedances?


Sorry for asking...but totally unfamiliar with all those different
HP Agilent 54xxx scopes (o;

But I'm just looking for an affordable high speed solution to debug
my FPGA designs mainly...



thx in advance
rick

 

[Gerhard Hoffmann]

On Mon, 23 Jul 2007 21:01:19 +0200, Richard Klingler <me@aol.com> wrote:

I'm looking for a refurbished scope and came across the 54121T + 54121A
which are sold quiet cheap and offer high sample rates...

No, it offers high bandwidth at very low sample rates

Is this combination only meant for RF designs or high speed digital
circuits as the 54121A is 50 Ohms only...

Or is there a test module where I can capture higher voltages also
with higher impedances?

You could use external 50 Ohm attenuators (20 dB = divide by 10 voltage-wise)
or FET probes for higher impedance. These cost a lot and are
limited to a few GHz of bandwidth.
There are also passive probes for 50 Ohm loads( TEK P6056, P6156)
but they may present 50 Ohm to 5K to the DUT depending on
attenuation factor.

But I'm just looking for an affordable high speed solution to debug
my FPGA designs mainly...

Use Modelsim XE ;-)

These 54xxx scopes are for repetitive signals only. You can use them
for characterizing rise/fall times or generate eye diagrams on
Xilinx Rocket I/Os, but not for general debugging because you
cannot see single events. Triggering in the sense of a Tek 475
is nonexistant, let alone in logic analyzer style.

I'd propose a HP16500C logic analyzer for FPGA debugging with
at least one state/time analyzer card and one or two
scope cards with 250 or 500 MHz BW. There exists an older
scope as a 2 card set(time base and aquisition) that is complete crap.

Or you might choose a non-plugin-version that would be easier to operate
than the touch screen menue system.

Single shot scopes with 1GHz or more BW will cost an arm & a leg.

If you insist in 54xxx, I think the sweet spot is 54750 / 54751
and 54701 probes. And don't kill those PC3.5 connectors with
cheap/defective SMAs.

regards, Gerhard

 

[networkinghardware.net]

Hello list , we are looking for following test equipment, used w/ deep
discounts preferred.
Thanks in advance,
Ben Youngblood
networkinghardware.net


Tektronix tds2014b
Rohde Schwarz cts55
Agilent 11945a
ENI 550l
Fluke 5200a
Amplifier Research 200l
Marconi 2955b
Agilent 8703b
Microtel MSR904A
Agilent 8485a
Microtel MSR904A
Marconi 2955b 3
Agilent 8703b 1
Anritsu 68077b
Anritsu 68077c
Anritsu 68247b
Agilent 8722a
Agilent 8722b
Agilent 8722c
Agilent 8722d
Agilent e8362a
Agilent 54845a
Tektronix tds694c
Lecroy wp960xl
Agilent 8564e
Agilent 8574a
Agilent e8267d



Kind Regards,
Ben Youngblood


http://www.networkinghardware.net


DCR is your one stop solution for Datacom, Networking & Telecom
hardware, new and used at 60% to 90% off list.

We buy & sell 3com, ADC/Kentrox, Adtran, Ascend/Lucent, AVAYA,
Cisco, Enterasys/Cabletron, Extreme, JUNIPER NETWORKS, Larscom,
Lucent PSAX, N.E.T. Promina & IDNX, Nortel, Cisco/Stratacom,
Newbridge,
Verilink, Nortel Networks, TELLABS and more...

Over 5,000 items in stock. Please visit out our website @

http://www.networkinghardware.net

SOME INVENTORY ON-LINE. PLEASE CALL
OR REPLY FOR UPDATED OR INCOMING INVENTORY


Ben "Benny" Youngblood networkinghardware.net

 

[Richard Klingler]

Gerhard Hoffmann wrote:

On Mon, 23 Jul 2007 21:01:19 +0200, Richard Klingler <me@aol.com> wrote:

I'm looking for a refurbished scope and came across the 54121T + 54121A
which are sold quiet cheap and offer high sample rates...

No, it offers high bandwidth at very low sample rates


Is this combination only meant for RF designs or high speed digital
circuits as the 54121A is 50 Ohms only...

Or is there a test module where I can capture higher voltages also
with higher impedances?

You could use external 50 Ohm attenuators (20 dB = divide by 10 voltage-wise)
or FET probes for higher impedance. These cost a lot and are
limited to a few GHz of bandwidth.
There are also passive probes for 50 Ohm loads( TEK P6056, P6156)
but they may present 50 Ohm to 5K to the DUT depending on
attenuation factor.

But I'm just looking for an affordable high speed solution to debug
my FPGA designs mainly...

Use Modelsim XE ;-)

These 54xxx scopes are for repetitive signals only. You can use them
for characterizing rise/fall times or generate eye diagrams on
Xilinx Rocket I/Os, but not for general debugging because you
cannot see single events. Triggering in the sense of a Tek 475
is nonexistant, let alone in logic analyzer style.

I'd propose a HP16500C logic analyzer for FPGA debugging with
at least one state/time analyzer card and one or two
scope cards with 250 or 500 MHz BW. There exists an older
scope as a 2 card set(time base and aquisition) that is complete crap.

Or you might choose a non-plugin-version that would be easier to operate
than the touch screen menue system.

Single shot scopes with 1GHz or more BW will cost an arm & a leg.

If you insist in 54xxx, I think the sweet spot is 54750 / 54751
and 54701 probes. And don't kill those PC3.5 connectors with
cheap/defective SMAs.

regards, Gerhard

Looked at the 54720D now which is available for a good price...

Would this be a nice choice together with a bunch of 54712A
and 54701A probes for hobbyist use? Still much cheaper than
a brand new WJ314...


cheers
rick

 

[Gerhard Hoffmann]

On Thu, 26 Jul 2007 11:14:24 +0200, Richard Klingler <me@aol.com> wrote:

Looked at the 54720D now which is available for a good price...

Would this be a nice choice together with a bunch of 54712A
and 54701A probes for hobbyist use? Still much cheaper than
a brand new WJ314...

Looks good. If the price is right..

Gerhard