RF Voltmeter?
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On 10/06/2017 11:02 PM, Bob Macklin macklinbob@...
[hp_agilent_equipment] wrote: I have a Boonton Model 93 RF Voltmeter.The HP 3406A comes to mind. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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The 411A is the older, vacuum tube version of the 3406, vintage the same as the 400D/H/L AC and the 412 DC voltmeters. JeremyOn Fri, Oct 6, 2017 at 8:06 PM, Dave McGuire Mcguire@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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The Boonton 93 is a True RMS Voltmeter, usable to 20 MHz. Maybe he meant the model 92?
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-----Original Message-----
From: "xhfeng2002@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
开云体育Apples and Oranges.? The Boonton 92 is a specialized RF Millivoltmeter.? The HP 410 is a general-purpose VTVM whose AC probe works at UHF. “Not quite as sensitive” – yeah, by three orders of magnitude! ? Dave ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Thursday, October 12, 2017 10:36 AM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] RF Voltmeter? ?
? I think you are right. From the spec, the Boonton 92 seems has better sensitivity than HP410C, I don't have neither Boonton 92 nor HP410C so I can't comment on which one is actually better. Instead I have a Boonton 91 and a HP410B, they use different diode probes, Boonton has solid state, HP has tube, both 91 and 410B are quite stable and has good consistence, their frequency range is about the same, up to 1GHz, my Boonton 91 is off a lot at the 1mV range, it could be caused by some leaking caps. The HP410B's lowest range is 1V, not quite as sensitive as the Boonton. ? Henry
The Boonton 93 is a True RMS Voltmeter, usable to 20 MHz. Maybe he meant the model 92? >From: "xhfeng2002@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell
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Dave,
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Not quite, the 410C has 15mV scale, same probe diode as 410B. Henry ---In hp_agilent_equipment@..., <david_wise@...> wrote : Apples and Oranges.? The Boonton 92 is a specialized RF Millivoltmeter.? The HP 410 is a general-purpose VTVM whose AC probe works at UHF. “Not quite as sensitive” – yeah, by three orders of magnitude! ? Dave ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Thursday, October 12, 2017 10:36 AM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] RF Voltmeter? ?
? I think you are right. From the spec, the Boonton 92 seems has better sensitivity than HP410C, I don't have neither Boonton 92 nor HP410C so I can't comment on which one is actually better. Instead I have a Boonton 91 and a HP410B, they use different diode probes, Boonton has solid state, HP has tube, both 91 and 410B are quite stable and has good consistence, their frequency range is about the same, up to 1GHz, my Boonton 91 is off a lot at the 1mV range, it could be caused by some leaking caps. The HP410B's lowest range is 1V, not quite as sensitive as the Boonton. ? Henry
The Boonton 93 is a True RMS Voltmeter, usable to 20 MHz. Maybe he meant the model 92?
Michael A. Terrell
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开云体育Sorry, I was thinking about the B, not the C. ? Dave ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Thursday, October 12, 2017 10:57 AM To: hp_agilent_equipment@... Subject: RE: [hp_agilent_equipment] RF Voltmeter? ?
? Not quite, the 410C has 15mV scale, same probe diode as 410B. ? Henry
Apples and Oranges.? The Boonton 92 is a specialized RF Millivoltmeter.? The HP 410 is a general-purpose VTVM whose AC probe works at UHF. “Not quite as sensitive” – yeah, by three orders of magnitude! ? Dave ? From:
hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
?
? I think you are right. From the spec, the Boonton 92 seems has better sensitivity than HP410C, I don't have neither Boonton 92 nor HP410C so I can't comment on which one is actually better. Instead I have a Boonton 91 and a HP410B, they use different diode probes, Boonton has solid state, HP has tube, both 91 and 410B are quite stable and has good consistence, their frequency range is about the same, up to 1GHz, my Boonton 91 is off a lot at the 1mV range, it could be caused by some leaking caps. The HP410B's lowest range is 1V, not quite as sensitive as the Boonton. ? Henry
The Boonton 93 is a True RMS Voltmeter, usable to 20 MHz. Maybe he meant the model 92?
Michael A. Terrell
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Bob Albert
I have wanted an rf
millivoltmeter for some time.? I was using my HP410B which is fine
except it won't measure down to the millivolts. Then
I realized that my HP54542A oscilloscope has great bandwidth and
sensitivity down to 5 mV per division.? The probe situation presents a
problem but if I'm willing to settle for 50 mV per division I can use a
10:1 probe.? Still pretty good, and useful in many situations.? A 10 mV
rms signal (10,000 uV) will show as 28 mV p-p, about 1/2 division.? That
won't show at all on the 410B. On Thursday, October 12, 2017 10:45 AM, "David Wise david_wise@... [hp_agilent_equipment]" wrote: Apples and Oranges.? The Boonton 92 is a specialized RF Millivoltmeter.? The HP 410 is a general-purpose VTVM whose AC probe works at UHF.
“Not quite as sensitive” – yeah, by three orders of magnitude!
?
Dave
? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Thursday, October 12, 2017 10:36 AM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] RF Voltmeter? ?
Michael,? ?
I think you are right. From the spec, the Boonton 92 seems has better sensitivity than HP410C, I don't have neither Boonton 92 nor HP410C so I can't comment on which one is actually better. Instead I have a Boonton 91 and a HP410B, they
use different diode probes, Boonton has solid state, HP has tube, both 91 and 410B are quite stable and has good consistence, their frequency range is about the same, up to 1GHz, my Boonton 91 is off a lot at the 1mV range, it could be caused by some leaking
caps. The HP410B's lowest range is 1V, not quite as sensitive as the Boonton.
?
Henry
The Boonton 93 is a True RMS Voltmeter, usable to 20 MHz. Maybe he meant the model 92?
-----Original Message----- >From: "xhfeng2002@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
>Sent: Oct 12, 2017 11:24 AM >To: hp_agilent_equipment@... >Subject: Re: [hp_agilent_equipment] RF Voltmeter? > >Is Boonton 93 more like HP3400, HP3403? Michael A. Terrell
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The Boonton cables start to have high resistance in the shields, allowing signal ingress ion. The Boonton 91 is a tube model (The only schematic I have is for the 91CA). It has a 50K balance pot across the probe input, that is labeled as R49. It has a 22Meg resistor from each end, to one of the inputs.
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Boonton makes a 100:1 divider to extend the range of their RF voltmeters.It is part number '91-7C 100:1 Voltage Divider Adapter'. Here is an example of one: -----Original Message-----
From: "xhfeng2002@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
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I sent him a message right after his email arrived and I haven't heard from him, either.
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-----Original Message-----
From: "'John Snyder' Kochcal@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
Dave McGuire
Jeremy Nichols
Michael A. Terrell