What to do if HT voltage does not increase in Jasco Measuring Instruments?
If the HT voltage isn't increasing on your Jasco Measuring Instruments, first ensure that the shutter is open. Next, verify that the photometric mode is set to 'CD' and not 'Test signal'. Also, confirm that the HT voltage mode is set to 'Auto' instead of 'Manual' or 'Off'. Finally, make sure the sample chamber lid is completely closed.
What to do if the light source does not come on in Jasco J-1100?
If the light source on your Jasco Measuring Instruments doesn't turn on, first ensure that the device is set to turn on the light source at startup. Check that the flow rate of cooling water supplied to the 450 W light source is sufficiently high, and increase it if necessary. Verify that the anode holder is correctly installed and that the cathode fixing screw is tightened (for 450 W light sources). If you hear a sparking sound, the lamp likely needs replacement.
What to do if HT voltage has risen and will not decrease in Jasco Measuring Instruments?
If the HT voltage on your Jasco Measuring Instruments has risen and won't decrease, first remove any sample from the sample chamber. If you are using Model J-1500, increase the spectral bandwidth. Ensure the cable is correctly connected to the detector unit and the connector on the rear panel of the amplifier unit (Model J-1500). Verify the wavelength is set to a value where the detector is sensitive. If the wavelength is below 180 nm, increase the nitrogen gas flow rate.
How to fix power if it cannot be turned ON in Jasco J-1100 Measuring Instruments?
If your Jasco Measuring Instruments won't power on, first ensure the power cable is correctly plugged into the outlet. If it is, check if the fuse has blown and replace it if necessary.
Why is repeatability of CD values low on my Jasco J-1100 Measuring Instruments?
Low repeatability of CD values in Jasco Measuring Instruments can be due to several reasons. Ensure the instrument has warmed up for about one hour after turning on the light source before performing CD measurement. If the sample has deteriorated due to light irradiation, use the shutter function or narrow the spectrum bandwidth. If the variation in the peak value of aqueous solution of ammonium d-10-camphor sulfonate (distilled water, 10 mm cell) at 291.0 nm is not within 2 mdeg/hr, check another item. Ensure the room temperature is stable.
Why does a CD value display when the sample is not optically active on Jasco J-1100 Measuring Instruments?
A CD value might be displayed even when the sample isn't optically active in your Jasco Measuring Instruments if the sample is fluorescent; decrease sample absorbance to 2 or less by adjusting the concentration. If the sample is a film or liquid crystal, a spurious CD signal is probable. Also, the cell may contain optically active residue, so prepare a new sample.
Why is the displayed CD value smaller than normal on Jasco J-1100?
If the displayed CD value is smaller than normal, or no display appears on your Jasco Measuring Instruments, first ensure the HT voltage mode is set to 'Auto' and not 'Manual' or 'Off'. Check if the photometric value is 18?2 mdeg when the photometric mode is 'Test signal'; if out of range, failure of the electrical system or modulator element is probable.
Why is wavelength repeatability low on Jasco Measuring Instruments?
Low wavelength repeatability on Jasco Measuring Instruments can occur if the instrument hasn't warmed up sufficiently; measure wavelength repeatability after warming up the instrument for about one hour after turning on the light source. Also, ensure that the room temperature is stable.
What to do if water was leaking in the sample chamber of Jasco J-1100?
If water is leaking in the sample chamber of your Jasco Measuring Instruments, check if there is any water into the nitrogen inlet hose of the sample chamber. Wipe off any spilled water with a dry cloth. Disconnect the nitrogen hose from the bottom of the sample chamber and remove the water from the nitrogen hose.
General| Brand | Jasco |
|---|---|
| Model | J-1100 |
| Category | Measuring Instruments |
| Language | English |
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