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| HP 8591A ....FREQ UNCAL message | ||
| Author knoxville Views 22 Posted at 2008/9/4 16:41 [View In Forum] | ||
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Hi,hhpnmfyxhv hhpnmfyxhv 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? |
| Reply No. | Replier | Total Replies 2 [View All Replies] [New Reply] | Replied at |
| 1 | naoge | Maybe yes, You need change the internal battery and then cal freq and ampl. Cristian |
2008/9/4 16:41 |
| 2 | ai8957382 | 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! |
2008/9/4 16:41 |
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