HP 8153A - Page 58

Note
4
The environmental conditions and the temperature of the
instrument affect the electrical offset. For the best results you
must:
■ Allow the instrument time to acclimatize (c.24 hours).
■ Allow the instrument time to warm up (c.20 minutes).
■ Make sure that the optical input is not receiving any light. If
you are using multi-mode cable you must disconnect the cable
and cover the input to the sensor to perform a zero.
It is a good practice to zero the instrument before making any
important measurements.
The zero operation is performed just for the selected channel. The instrument
automatically repeats the zero operation for each measurement range.
Figure 2-3. The Display while Channel A Is Being Zeroed
If there is light at the sensor input during a zero operation, the instrument
shows the message ZERO ERR. If you cannot remove the light, but you still want
to use the instrument, you can abort the zero operation by pressing any key.
2-10 Local Control • Measure Mode