NARDA nbm-520, Operating Manual

Page: 31 / 64

4.3 Self test
Narda NBM-520
25
4.3 Self test
The self test takes a few seconds. During this time, the firm-
ware version is also displayed.
If the test is successful, the
message
OK
is displayed on the screen.
If an error message is displayed:
⇒
Press the
ON/OFF
button again to switch the instrument
off and then switch it on again.
If an error message is displayed again:
⇒
Switch the instrument off and contact your nearest
Narda Service Center.
4.4 Setting the contrast
You can change the display contrast dependent of the envi-
ronment lighting in order to achieve optimal instrument
read-out.
✓
The instrument is turned on and the self test is finished.
⇒
Press the
ON/OFF
button and
Mode
button
simultaneously to increase the contrast.
⇒
Press the
ON/OFF
button and
Units
button
simultaneously to decrease the contrast.