HP 5061B Cesium
Option 003 & 004
MSRP of the 5061B is $45,700.00
This HP 5061B Frequency Standard has the
Option 003 clock & standby power supply
(Please read description).
Option 004 High Performance Cesium Tube
(Please read description).
Quartz Oscillator Upgraded to 3010.
Front outputs for 1PPS, 10MHz, 5MHz, 1MHz &
Rear outputs for
1PPS, 10MHz, 5MHz, 1MHz, 100KHz & several different outputs for control and sync
AC and DC power inputs.
Copy of the Operating Information Manual
Copy of the Operation and Service Manual
High Performance Oscillator 3010 Upgrade
During our testing, the HP5061B demonstrated
exceptional performance. The
5061B locked and the system operated correctly.
We did not go through all the fine adjustments
to get the maximum performance from the system, but what we saw was very
For those of you that are well versed with the
HP 5061B or other Cesium Clocks, our tests showed the following:
When locked, the system had a
combined uncertainty better
This includes the combined uncertainty of the HP 5061B tracked against our
Agilent 53132A counter locked to our Agilent 58503B GPS clock. We have not
seen better performance with any other clock we have worked with.
Another item of note is that during warm up with the crystal oscillator alone.
It showed the best performance I have seen from a crystal oscillator.
The ion pump on the 5061B was very high when the unit
arrived. This is typical of a unit that has been stored for an
extended period of time. After 24 hours, it dropped to a point
where the 5061B had no problem locking but was still a bit high. There
are procedures in the manual for establishing a vacuum if the unit has been
stored for an extended period and a cesium lock can not be established after
a 24 hour warm up period. These procedures require use of an external
3500 VDC 5ma power supply to establish a better vacuum before switching to
normal operation. This may be necessary to achieve a better vacuum
This HP 5061B has tags on the rear showing option
003 (The clock and standby power supply) and 004 (high performance cesium
tube) are installed but I am not sure the tube is the high performance
version so check out the photos of the tube. Be aware even though the
stand by power supply and clock are installed, the batteries are not in the
IBeam Current Set In Perfect Adjustment For Normal
IBeam current can easily be adjusted to peg the meter,
a good sign showing plenty of tube life.
Second Harmonic In Perfect Adjustment For Normal Operation
Ion Pump is a bit high, most likely due to long storage.
The instrument is in excellent physical condition.
Although it has a few minor dings and scratches that can be seen in the photos.
Power cord is not included. We will put
a standard AC Power Connector on the unit if requested by the high bidder.