Pendulum CNT-90 Series User Manual

Using the Controls
The charging level indicator shows:
Description of Keys
• the relative charging level in percent
Power
The ON/OFF key is a toggling secondary
power switch. Part of the instrument is always
ON as long as power is applied, and this
standby condition is indicated by a red LED
above the key. This indicator is consequently
not lit while the instrument is in operation.
■ CNT-91R and CNT-91R/71B only
While the rubidium oscillator is warming up, an
open padlock symbol labeled RB is flashing at
the top right corner of the display, indicating
that the control loop is not locked. Normal time
to lock is about 5 min. Do not start measuring
until the unlock symbol disappears.
New Message Box
Information exchange between the rubidium
oscillator and the CPU takes place over a serial
bus. Any malfunction in the UART-con-trolled
communication link will be reported in a pop-up
message box on the display.
■ CNT-90(XL) w. Option 23/90
The User Interface Screens have two indica-
tors near the upper right corner of the display.
One is a power supply status indicator and
the other is a battery charging level indicator.
The status indicator shows:
•
a fixed battery symbol when the internal
battery is the active power source
•
a charging battery symbol when the internal
battery is being charged
•
a power plug symbol when the mains is the
active power source
•
a power plug symbol on top of a battery
symbol when the instrument has been
prepared for UPS operation and charging is
not going on
Select Function
This hard key is marked MEAS FUNC.
When you depress it, one of the menus
below will open.
Fig. 2-1
CNT-90: Select measurement function.
Fig. 2-2
CNT-90XL: Select measurement
function.
Fig. 2-3
CNT-91(R): Select measurement
function.
The current selection is indicated by text in-
version that is also indicating the cursor posi-
tion. Select the measurement function you
want by depressing the corresponding softkey
right below the display.
Alternatively you can move the cursor to the
wanted position with the
RIGHT/LEFT arrow
keys. Confirm by pressing
ENTER.
A new menu will appear where the contents
depend on the function. If you for instance
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
2-7

Pendulum CNT-90 Series Specifications

General

Brand	Pendulum
Model	CNT-90 Series
Category	Measuring Instruments
Language	English