Quantum HD 9021 manual Err, Ofl, Probe Connection, HOW to Measure

			ENGLISH
Key	Symbols lit besides	Description
	the numbers
	Err	If the probe is not connected to the
		instrument when it is switched on, or
		if there is a break in the probe, the
		"Err" message appears.
	E1	This message appears on the
		display when the user tries to obtain
		the difference between inputs A and
		B when two probes of different types
		are connected.
	OFL	This symbol appears on the display
		when the reading is out of scale.

PROBE CONNECTION

The HD 9021 may be fitted with either one or two probes; the instrument has two DIN 45326 8-pole inputs, input A and input B. If only one input is used, be careful when using the keys for input A or B.

The instrument recognizes the type of probe connected, which is distingui- shed by a suitable code; it then gets ready to take the measurement accor- ding to the characteristics of the probe connected. The connectors are polarized and it takes a certain effort to insert or remove them; proceed in such a way as to avoid damaging the connector, do not pull the cables to disconnect the probe as there would be a risk of tearing them.

HOW TO MEASURE

Press the ON/OFF key to switch on the instrument. If the probes are con- nected, the instrument is ready to indicate their value. The instrument may be fitted with probes for measuring temperature (°C, °F), probes forphoto- metric measurements (lux, fcd) or radiometric probes (W/m2). When the instrument is switched on the auto-power off device is activated; this means that the instrument switches off automatically after 8 minutes unless another key is pressed. If the instrument switches off automatically while a measurement is being taken it is sufficient to switch it back on.

Measurements are taken by positioning the probe in the desired point; the choice of the type of probe, the position and place depend on the type of recording that the user intends to make.

The operator must be sure that his own presence, foreign bodies or outsi- de sources do not interfere with the recording.

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