AnsweredAssumed Answered

HP 8591A ....FREQ UNCAL message

Question asked by FM on Feb 28, 2008
Latest reply on Mar 18, 2008 by FM

Like • Show 0 Likes0
Comment • 2

Hi,
I have this spectrum since 1992 but the batterie was installed in 1990. This is 18 years and I don't think the internal batterie had been change. It is mark on the back of the instrument that the batterie will last 8 years at room temperature. In the case of the batterie had failed, could that cause me the FREQ UNCAL problem because it can't hold anymore the calibration coefficients?

No one else has this question

Outcomes

2 Replies

esnaola Feb 28, 2008 11:04 AM
Mark Correct
Correct Answer
Maybe yes,

You need change the internal battery and then cal freq and ampl.

Cristian
Like • Show 0 Likes0
Actions
FM Mar 18, 2008 6:50 AM
Mark Correct
Correct Answer
I did check the batterie and the voltage is normal.

The symptoms are: When I power up the spectrum, the Center Frequency is off (like not lock), then when I hit the Center Freq button, I can see that the center frequency is moving toward where it suppose to be and then lock (like center at 900 MHz...this is a 1.8 GHz spectrum).

Then if I place the Center Freq at 1 GHz, it might unlock or will unlock if I reduce the SPAN (need to power up again).
This is kind of bizarre that when I hit Center Freq, I am able to make it lock!
Like • Show 0 Likes0
Actions

HP 8591A ....FREQ UNCAL message

Outcomes

Related Content

Recommended Content