ELTRA ONH-2000 User Manual

 2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.19-1
1.19 1.19 Saved data is lost
 Make sure that a 74 LS 04 is present.
 At this location only an LS-Type has to be installed.
 Replace the accumulator ( accu in diagram ), when the accumulator will not charge
after the power has been switched on, and after installing the 74 LS 04
Once the analyser is switched off and the accu didn’t charge data will be lost !!!
The data that is meant here is the data that is saved in the accumulator-buffered RAM
area. It consists mainly of the calibration factors, the blank values, and the linearity
factors, which are entered via the keyboard. See 2. 9
The linearity factors, which were programmed in our company when the device was
manufactured, are saved in the EPROM, they don’t get lost.
After turning on the power again ( with an empty accumulator ), those default linearity
factors that are saved in the EPROM’s are the current values. Therefore, you should
note any linearity factors that you enter via the keyboard, in case the accumulator
gets empty.
1.4E
+
+
+
+
+
+
H L
EPROM EPROM
RAM RAM
18065
74 LS 04

ELTRA ONH-2000 Specifications

General

Brand	ELTRA
Model	ONH-2000
Category	Measuring Instruments
Language	English