Chuck,
Got two of these guys, the "B" and the "C". The C is the desirable one,
50ohms, but you will pay about three times the price. Use the adapter, it's
$16 from the link below, it just isn't worth taking apart. Also, you will
need a 50ohm BNC feed thru termination, then set the front panel to 10Kohm
input. That will get you back to a 50 ohm input. Then you need to add
approx 1.76dB to correct the display for the change from 75ohms to 50ohms.
You can use the display offset function. Assuming this a fancy voltmeter,
note that for 0dBm in a 75 ohm system you need 274mV at the terminals. 0dBm
in a 50 ohm system can only provide 224mV, and thus will read -1.76dBm.
Thus add 1.76dBm to correct the display.
Impedance 50 75 75
Voltage 0.224 0.224 0.274
Watts 0.001 0.001 0.001
dBm 0.000 -1.761 0.000
Good luck
Bob
http://www.milestek.com/s-147-trompeter-connectors.aspx
----- Original Message -----
From: "Chuck Forsberg WA7KGX N2469R" <[email protected]>
To: "time-nuts" <[email protected]>
Sent: Thursday, July 19, 2012 2:22 AM
Subject: [time-nuts] HP 3586B Selective Level Meter
Got one of these massive (by today's standards) beasts the other day.
It has the option 003. Quite the light show when it powers up.
I have its external reference daisy chained with a radio and two other
instruments sucking 10 MHz from my Thunderbolt.
I have not decided what to do with the AT&T front panel input.
Should I get a BNC adapter for it? Or replace it with a BNC
connector?
--
Chuck Forsberg WA7KGX N2469R [email protected] www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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